G111 0504B142R01006008001A0151 CMS Moderately plagioclase clinopyroxene phyric basalt                              Intergranular, subophitic                                                                           Unit 151                                Fine                                                                             Plagioclase         Clinopyroxene                                                                   8    1                   8    1                   0.2-2.0    1-2                                         An 54                                             Diopside/Augite                                                                                                                                                                                         Euhedral, tabular                                 Subhedral                                                                                                                                                                                               Occur as glomerocrysts and single crystals.  Sometimes together with cpx.  Strained (wavy extinction).                                                                                                                                                    Minor alteration to actinolite along cleavage traces.  Occurs as glomerocrysts with plag.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Plagioclase         Clinopyroxene       Olivine             Magnetite                               35   30   none 1         41   36   3    1         150 microns75 microns 75 microns 35 microns            An 45                                                                                                                                                                                                                                                     Euhedral, bladed                                  Subhedral                                         Subhedral                                         Subhedral                                                                                           Replaced in part by chlorite(?), clays.                                                                                                                                                                                                                   Replaced in part by clays(?), actinolite(?).                                                                                                                                                                                                              Replaced by chlorite, talc, clays(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Sphene              Magnetite           Pyrite(?)           Talc                Chlorite, actinolite9    4    3    Tr   8    0.2  0.8  Tr   Plag.                                   Olivine, plag.                          Cpx                                     Magnetite(?)                            Olivine, cpx                            Olivine                                 Olivine, cpx                            Veins                                   Plag replaced, especially in vugs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Especially in vugs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Especially in vugs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Minor veins, 50 micron wide, of chlorite, actinolite, and possibly quartz, occur in the section.                                                                                                                                                          Although the rock is generally fine grained, it has a patchy appearance with patches or "vugs" up to 2 mm in which alteration minerals, chlorite, magnetite, and clays, are concentrated.  Magnetite concentration in the matrix occurs around radiating plag laths and may represent devitrification of original glassy mesostasis.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Y
G111 0504B142R01009012001R0152 DIV Highly plagioclase clinopyroxene olivine phyric basalt                          Chilled margin, hypohyaline                                                                         Chilled margin, unit 152                Glass + phenocrysts. Hyaline.                                                    Olivine             Plagioclase         Clinopyroxene                                               5    20   7              9    20   7              < 0.5-2.5  < 0.1-2.8  < 0.5-2.5                        Fo 85                                             An 65(??)                                         Augite/diopside Salitic                                                                                                                               Euhedral-subhedral                                Euhedral                                          Euhedral, resorbed                                                                                                                                    Altered to 1) Mixed-layer clays + talc + magnetite; 2) Chlorite + talc + magnetite + actinolite.                                                                                                                                                          Single crystals or glomerocrysts. Glass inclusions in centers.                                                                                                                                                                                            Glomerocrysts with plag, and single crystals. Reaction with glass; 0.05 mm rims. Glass inclusions up to 50 microns. Basal twins common.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Glass               Plagioclase                                                                     0    2                   53   12                  ?          20 microns                                                                                                                                                                                                                                                                                            ?                                                 Euhedral                                                                                                                                                                                                Now smectite + chlorite + oxides.                                                                                                                                                                                                                         Microlites.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Sphene              Quartz              Oxides              Talc                Chlorite            25   19.1 0.2  (?)  (?)  21.5 0.2  Tr   Ol, matrix                              Ol, matrix                              Ol                                                                                                                      Ol, matrix                              Ol                                      Veins                                   ~ 2% replacing ol.                                                                                                                                                                                                                                        ~ 1% replacing ol.                                                                                                                                                                                                                                        Replaces ol together with chlorite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Mainly magnetite and hematite. Replaces groundmass.                                                                                                                                                                                                       Replaces ol.                                                                                                                                                                                                                                              Chlorite filled fracture (0.5 mm) with quartz + minor actinolite + possible sulfide.                                                                                                                                                                      Phenocrysts of plag, plag + cpx, and plag + ol commonly occur in glomerocrysts. Cpx + ol are resorbed in places. Plag + cpx commonly have glass inclusions, 40-80 microns. Ol alteration occcured first along crystal margins and then along fractures. Phenocrysts are often broken. Chilled margin: Pyrite intergrown with chalcopyrite, chalcopyrite inclusions in pyrite, pyrite intergrown with magnetite, small pyrrhotite inclusions in pyrite. Thin section is taken at contact between two basaltic dike units. Unit 152 is clearly chilled compared to unit 151. Unit 152 shows altered glassy contact, 2 mm wide, grading into altered glassy mesostasis with microlites of plag. Oxide + smectite + chlorite alteration. Intrusion permissive since no rip-ups of older unit in chill. Cpx in reaction relationship with glass; resorbed margins and numerous glass inclusions. Plag phenocrysts (core An 65) show normal zoning towards outside third of crystals. Also have glass inclusions in centers.                  N
G111 0504B142R01009012001B0151 CMS Moderately plagioclase clinopyroxene phyric basalt                              Subophitic (diabasic)                                                                               Contact unit 151                        Fine to aphanitic                                                                Plagioclase         Clinopyroxene                                                                   6    <1                  6    <1                  0.3-1.0    0.5                                         An 45                                                                                                                                                                                                                                                     Euhedral-subhedral                                Euhedral                                                                                                                                                                                                Zone Marginal 1/10 of crystals.  Glomerocrysts.                                                                                                                                                                                                           Only one phenocryst represented.  Appears fresh.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Plagioclase         Clinopyroxene       Oxides                                                      45   25   2              50   42   2              <0.1-0.5   0.1        <0.1-0.2                         An 40                                             Augite                                            Magnetite(?)                                                                                                                                          Acicular, bladed                                  Stubby, subhedral                                 Anhedral                                                                                                                                              Altered in part to clays (+/- talc?).                                                                                                                                                                                                                     Altered to oxides/chlorite/clays.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Sphene              Oxides                                                                          6    6    <2   <1   7                   Cpx, plag                               Cpx                                     Cpx                                     (?)                                     Cpx                                                                                                                                                             Alteration predominantly of groundmass cpx, and some plag.                                                                                                                                                                                                Alteration of groudmass cpx.                                                                                                                                                                                                                              Cpx in groudmass replaced in part.  Somewhat patchy distribution.                                                                                                                                                                                         Small, euhedral, high relief crystals, possibly sphene in groudmass.                                                                                                                                                                                      Patchy.  Occurs with chlorite in some aggregates, ~ 20-30% altered.  These patches ~ 1 mm.  Slightly finer grain size.  Generally due to alteration of cpx.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Unit 151.  This thin section is problably not representative of the unit.  Thre is no record of ol phenocrysts which are described in the lithological description.  Likewise for cpx.  Plag phenocrysts problably underestimated in lithological description.  In so far as plag concerned, almost seriate porphyritic since maximum groundmass plag is larger than minimum phenocryst.  See 111-504B-142R-1 (Piece 1A, 6-8 cm).  Note: patchy clots of oxides + chlorite + clays +/- actinolite may represent altered areas of finer groundmass.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      N
G111 0504B142R01101104015 0153 DIV Moderately plagioclase clinopyroxene olivine phyric basalt basaltic             Cataclatsic (30-40% clasts)                                                                         Contact between dike + breccia unit 153 Very fine to fine                                                                Olivine             Plagioclase         Clinopryoxene                                               < 1  4    < 1            < 1  6    < 1            </= 1      150 u-1 mm 1.5                                                                                                                                                                                                                                                                                        Subhedral                                         Euhedral                                          Subhedral                                                                                                                                             Single crystals. Glomerocrysts with plag.                                                                                                                                                                                                                 Tabular. Glomercrysts. Recrystallized.                                                                                                                                                                                                                    Fresh.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Clinopyroxene       Plagioclase                                                                     70   20                  70   20                  < 0.1      < 0.5                                                                                                                                                                                                                                                                                                 ?                                                 ?                                                                                                                                                                                                       Fresh.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Zeolites            Zeolites            Chlorite            Albite              Actinolite          Sphene              Opaques             Tr   Tr        4    Tr   1    Tr   Tr   Olivine, matrix                         Plag, veins                             Veins                                   Olivine, talc, veins                    Plag                                    Veins, matrix                           Opaques                                 Opaques, olivine                        Some mixed-layer clays associated with talc in altered olivine and dispersed in the groundmass.                                                                                                                                                           Some broken plag in the chlorite cement seem replaced by zeolites.                                                                                                                                                                                        Post-brecciation veins contain zeolite(?).                                                                                                                                                                                                                Also occurs in the cement. Probable mixed-layer chlorite/clays and chlorite.                                                                                                                                                                              Partial replacement of plag.                                                                                                                                                                                                                              Occurs in the matrix of coarse-grained clasts.                                                                                                                                                                                                            Often found replacing oxides. Probably occurs with chlorite in a 1 micron-wide vein.                                                                                                                                                                      Scarce pyrite. Rare chalcopyrite. Magnetite.                                                                                                                                                                                                              Greenish clasts of basltic breccia, at the contact with a dike, are cemented by chlorite. The chilled margin of the dike is brecciated. the size of the clasts is < 1mm - 1.5 cm. Olivine can be fresh as well as completely replaced by chlorite and/or talc; talc crystallized first. Plag is partially replaced by chlorite and actinolite along cleavage traces and cracks. Plag is also replaced by patches of albite. The groundmass is cryptocrystalline, partially replaced by mixed-layer clays.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               N
G111 0504B142R02057059008A0153 DIV Moderately plagioclase clinopyroxene phyric basalt                              Subophitic                                                                                          S.O. Unit 153                           Fine                                                                             Plagioclase         Clinopyroxene                                                                   4    3                   4    3                   0.5-2.0    0.5-2.5                                                                                                                                                                                                                                                                                               Euhedral, laths                                   Euhedral,subhedral                                                                                                                                                                                      Glassy and fluid inclusions. Some crystals show zonation. Partially altered to chlorite along fractures.                                                                                                                                                  Partially altered to actinolite(?) along fractures.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Plagioclase         Clinopyroxene       Olivine             Magnetite                               30   25   0    5         32   26   30   5         < 0.25     < 0.25     < 0.25     < 0.10                                                                                                                                                                                                                                                                          Euhedral                                          Anhedral                                          Anhedral                                          Euhedral-subhedral                                                                                  Partially altered to chlorite.                                                                                                                                                                                                                            Partially altered to actinolite.                                                                                                                                                                                                                          Totally altered to chlorite, mixed-layer clays, +/- talc, +/- pyrite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Talc                Magnetite                                                                       15   15   < 0.5< 0.52                   Ol                                      Ol, plag                                Cpx                                     Ol                                      Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              < 0.25 mm-wide fracture filled by chlorite. Pyrite grains up to 100 microns, sometimes with inclusions of chalcopyrite (< 10 microns) wide. Traces of chalcopyrite (< 10 microns) wide in groundmass.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   N
G111 0504B143R01002004001 0154 DIV Highly plagioclase clinopyroxene olivine phyric basalt                          Intergranular to subophitic                                                                         Top of unit 154                         Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    14   5              2    15   5              0.3-2.0    0.3-3.0    0.3-5.0                                                                                                                                                                                                                                                                                    Euhedral                                          Euhedral                                          Subhedral                                                                                                                                             Replaced by chlorite + actinolite, or by mixed layer chlorite-smectite + talc + magnetite + pyrite.                                                                                                                                                       Partially replaced by chlorite.                                                                                                                                                                                                                           Rarely replaced partially by actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Plagioclase         Clinopyroxene       Olivine             Magnetite                               30   20   0    10        30   25   5    10        < 0.02     < 0.02     < 0.02     < 0.02                                                                                                                                                                                                                                                                          Euhedral-subhedral                                Subhedral                                         ?                                                 ?                                                                                                   Fresh.                                                                                                                                                                                                                                                    Replaced by actinolite.                                                                                                                                                                                                                                   Replaced by mixed-layer clays.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Pore spac                  3                                               Uniform                                                     Clay, chlorite                                                                                                          Irregular                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Clays               Chlorite            Actinolite          Sphene              Plagioclase         Pyrite              Magnetite           Talc                8.5  10   0.5  0.1  0.5  0.4  0.5  0.5  Ol                                      Ol, plag                                Ol, cpx                                 Vein                                    Plag                                    Ol, groundmass                          Ol                                      Ol                                      Mixed-layer chlorite-smectite replacing olivine and filling pores.                                                                                                                                                                                        Also in small, ~ 30 micrometer veinlets.                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Trace in small chlorite veinlet.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Rock is highly phyric in contrast to barrel sheet desrciption as moderately phyric. Traces of disseminated pyrite and chalcopyrite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     N
G111 0504B143R01105107017 0155 DIV Highly olivine clinopyroxene plagioclase phyric basalt                          Subophitic                                                                                          Unit 155                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               < 0.114   10             4    16   10             0.5-2.0    0.5-3.0    0.5-2.0                                                                                                                                                                                                                                                                                    Euhedral-subhedral                                Euhedral-subhedral                                Anhedral-subhedral                                                                                                                                    Altered to 1) mixed layer clays + chlorite + talc + Fe Oxide + pyrite. 2) Chlorite + mixed layer clays + pyrite + Fe oxides.                                                                                                                              Sericite + chlorite in fractures. Glomerocrysts.                                                                                                                                                                                                          Randomly chloritized (actinolite?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Plagioclase         Clinopyroxene       Olivine             Magnetite                               25   10   0    5         40   15   10   5         < 0.2      < 0.2      < 0.2      < 0.2                                                                                                                                                                                                                                                                           Euhedral                                          Anhedral-subhedral                                Subhedral-anhedral                                ?                                                                                                   Altered to sericite + chlorite.                                                                                                                                                                                                                           Altered to chlorite.                                                                                                                                                                                                                                      Altered to sericite + chlorite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Fe oxides           Pyrite              Talc                                                        12   18   Tr   5    0.5  0.5            Ol, magnetite                           Ol, plag, matrix                                                                Ol, matrix                              Ol                                      Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Magnetite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Prismatic plag phenocrysts have glass inclusions (up to 15 microns), often concentrated in center of crystals. Also fluid inclusions </= 15 microns. Some plag phenocrysts are zoned. groundmass plag crystals are lath-like. Pyrite is intergrown with chalcopyrite. Individual crystals of chalcopyrite are also present. Pyrite is also intergrown with or replacing magnetite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      N
G111 0504B144R01004006001 0156 DIV Highly plagioclase clinopyroxene olivine phyric basalt                          Subophitic                                                                                          Unit 156                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    7    4              1    7.5  4              0.5-1.0    0.5-2.0    0.5-2.0                                                                                                                                                                                                                                                                                    Subhedral                                         Euhedral-subhedral                                Subbhedral-euhedral                                                                                                                                   Altered to talc +/- chlorite +/- pyrite +/- actinolite(?).                                                                                                                                                                                                Altered along fractures to chlorite +/- clays.                                                                                                                                                                                                            Actinolite(?) forming in fractures(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Plagioclase         Clinopyroxene       Olivine             Magnetite                               25   29   0    6         27   30   24.5 6         < 0.5      < 0.5      < 0.5      < 0.2                                                                                                                                                                                                                                                                           Subhedral-euhedral                                Anhedral                                          Anhedral                                          Subhedral-anhedral                                                                                  Slightly altered to chlorite along fractures.                                                                                                                                                                                                             Slightly altered to chlorite along fractures.                                                                                                                                                                                                             Altered to chlorite +/- mixed layer clays +/- Fe oxides.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Talc                Magnetite                                                                                           8.5  18   0.5  2                        Ol                                      Ol                                      Ol                                      Ol                                                                                                                                                                                                      Also possibly replacing plag.                                                                                                                                                                                                                             Also replacing some plag and cpx.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Plag has abundant glass and some fluid inclusions. Some plag crystals are strongly zoned. This thin section shows fractures (< 0.1 mm) filled with chlorite. Pyrite ( + chalcopyrite) replaces magnetite. Pyrite has a trace amount of chalcopyrite inclusions ( + sphene?). Chalcopyrite is also disseminated in the matrix.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           N
G111 0504B144R01089091013 0158 DIV Highly plagioclase clinopyroxene olivine phyric basalt                          intergranular                                                                                       Unit 158                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    15   2              1    15   2              0.3-0.6    0.6-2.0    0.3-1.5                                                                                                                                                                                                                                                                                    Subhedral                                         Euhedral                                          Subhedral                                                                                                                                             Replaced by chlorite and mixed-layer clays.                                                                                                                                                                                                               Single crystals and glomercrysts. Zoned. Partially replaced by chlorite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Plagioclase         Clinopyroxene       Magnetite                                                   34.3 33   10             34.3 33   10             < 0.3      < 0.3      < 0.3                                                                                                                                                                                                                                                                                      Subhedral                                         Subhedral                                         Euhedral                                                                                                                                                                                                                                                                                                                                                                                                        Partially replaced by actinolite.                                                                                                                                                                                                                         Slightly replaced by sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Vugs                       2              < 0.1                            Even                                                        Chlorite                                                                                                                Irregular                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Zeolites            Chlorite            Actinolite          Sphene                                                                                              0.1  5    0.5  0.1                      Plag                                    Ol, plag, vugs                          Cpx                                     Magnetite                                                                                                                                                                                               Replaces plag. Also occurs in 0.05 mm veinlets.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         N
G111 0504B144R01110112016 0159 DIV Sparsely plagioclase phyric basalt                                              Subophitic, microcrystalline                                                                        Unit 159                                Very fine to aphanitic                                                           Plagioclase                                                                                         < 1                      < 1                      0.1-0.5                                                                                                                                                                                                                                                                                                          Euhedral-subhedral                                                                                                                                                                                                                                        Fresh. Isolated crystals and glomercrysts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Plagioclase         Clinopyroxene       Titanomagnetite     Olivine                                 30   60   < 10 Tr        30   60   ~ 10 ?         100-200 u  < 100 u    < 75 u     ?                                                                                                                                                                                                                                                                               Tabular                                           Anhedral-subhedral                                Skeletal,anhedral-                                ?                                                                                                   Laths up to 225 microns. Percent varies from place to place.                                                                                                                                                                                              Percentage varies from place to place.                                                                                                                                                                                                                    Morphology continued: subhedral.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Sphene              Maghemite           Pyrite              Chalcopyrite                                                                    Tr   Tr   Tr   Tr   Tr                  Mesostasis                              Ti magnetite                            Magnetite                               Ol                                      Ol                                                                                                                                                              Mixed-layer clays. In interstices between microlites.                                                                                                                                                                                                                                                                                                                                                                                                                                                               After titanomagnetite in some areas. Darker than magnetite in reflected light.                                                                                                                                                                            Anhedral to subhedral. In interstices, as probable replacement products after ol.                                                                                                                                                                         Between the microlites.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Groundmass is relatively unaltered. Alteration is < 1% of the whole rock. Maghemite(?) constitutes approximately 2/3 of the alteration minerals.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        N
G111 0504B145R01039042006 0160 DIV Highly plagioclase clinopyroxene olivine phyric basalt                          Subophitic, glomerophyric                                                                           Unit 160                                Medium                                                                           Olivine             Plagioclase         Clinopyroxene       Spinel                                  0    10   3    < 1       3    10   5    < 1       1.0-4.0    1.0-3.0    0.5-1.5    0.5                                                                                                                                                                                                                                                                             Subhedral-anhedral                                Euhedral                                          Subhedral                                         Euhedral                                                                                            Altered to chlorite +/- mixed-layer clays =/- talc +/- actinolite +/- magnetite +/- Fe hydroxides.                                                                                                                                                        Chlorite (< 1%), albite(?) in fractures.                                                                                                                                                                                                                  Partially altered to actinolite.                                                                                                                                                                                                                          Chromite(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Plagioclase         Clinopyroxene       Olivine             Magnetite                               40   15   0    10        42   17   13   10        < 0.5      < 0.5      < 0.5      < 0.5                                                                                                                                                                                                                                                                           Subhedral, euhedral                               Subhedral                                         Anhedral                                          Anhedral                                                                                            Altered to chlorite.                                                                                                                                                                                                                                      Altered to actinolite.                                                                                                                                                                                                                                    Altered to chlorite =/- mixed-layer clays +/- talc +/- actinolite.                                                                                                                                                                                        Altered to maghemite, sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Albite              Actinolite          Sphene              Quartz              Talc                Magnetite           5    15   < 1  1    < 1  < 1  1    < 1  Ol                                      Plag, ol                                Plag                                    Cpx                                     Magnetite                               Veins                                                                           Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Two types of veins: A) </= 1 mm,filled by chlorite +/- talc(?) +/- mixed-layer clays; B) ~ 2 mm, lined by chlorite, filled by quartz +/- sulfides. Quartz replaced by chlorite (?). Abundant sulfides (chalcopyrite) adjacent to vein, minor pyrite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    N
G111 0504B145R01096098013A0160 DIV Highly plagioclase clinopyroxene olivine phyric basalt                          Subophitic                                                                                          Unit 160                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    14   4              1    15   5              0.3-1.0    0.3-2.0    0.3-3.0                                                                                                                                                                                                                                                                                    Euhedral-subhedral                                Euhedral                                          Subhedral                                                                                                                                             Replaced by mixed-layer clays, talc, chlorite, actinolite.                                                                                                                                                                                                Generally fresh. Partially replaced by chlorite(?).                                                                                                                                                                                                       Rare actinolite in fractures. Also chlorite(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Plagioclase         Clinopyroxene       Olivine             Magnetite                               48   16   0    5         49   20   5    5         < 0.2      < 0.2      < 0.2      < 0.2                                                                                                                                                                                                                                                                           Euhedral                                          Subhedral                                         Anhedral                                          ?                                                                                                   Replaced by chlorite.                                                                                                                                                                                                                                     Replaced by actinolite, chlorite(?).                                                                                                                                                                                                                      Replaced by talc, chlorite, mixed-layer clays.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Talc                Magnetite           Pyrite                                                      6    4    Tr   2    1    Tr             Ol                                      Ol, plag                                Cpx, ol                                 Ol                                      Ol                                                                                                                                                              Mixed-layer clays                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Replaces cpx and olivine along fractures.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Disseminated in the matrix.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Plag has abundant glass inclusions; some show zoning. Thin section contains traces of chalcopyrite (individual grains and intergrowths with pyrite) and some sphalerite (intergrown with pyrite and chalcopyrite).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      N
G111 0504B145R02123125010B0160 DIV Highly clinopyroxene plagioclase olivine phyric basalt                          Ophitic to subophitic                                                                               Unit 160                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    4    6              3    5    7              0.3-2.5    0.2-2.0    0.5-5.0                                                                                                                                                                                                                                                                                    Euhedral                                          Euhedral-subhedral                                Subhedral                                                                                                                                             Replaced by chlorite, actinolite, mixed layer clays, magnetite, pyrite.                                                                                                                                                                                   Partially replaced by albite, chlorite. Single crystals; glomerocrysts +/- cpx.                                                                                                                                                                           Single crystals; glomerocrysts with plag. Partially replaced by actinolite + magnetite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Plagioclase         Clinopyroxene       Magnetite                                                   35   33   2              40   40   4              0.05-0.20  0.05-0.30  0.01-0.05                                                                                                                                                                                                                                                                                  Euhedral-subhedral                                Subhedral                                         Euhedral                                                                                                                                              Partially replaced by chlorite, albite.                                                                                                                                                                                                                   Partially replaced by actinolite, magnetite.                                                                                                                                                                                                              Partially replaced by sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Miaroles                   1              0.05-0.50                        Even                                                        Chlorite, actinolite, sphene                                                                                            Irregular                                                                                                               One area with large (5 mm) irregular vug-filled chlorite + actinolite. Surrounding rock is extensively recrystallized ( up  to 100%).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Albite              Actinolite                                                                                          5    10   2    3                        Ol                                      Vugs, ol, plag                          Plag                                    Cpx, ol, vugs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Minor sulfides present. Secondary magnetite replaces olivine in vugs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   N
G111 0504B145R03044046004A0160 DIV Moderately plagioclase clinopyroxene olivine phyric basalt                      Ophitic to subophitic                                                                               Unit 160                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    4    3              2    5    3              0.5-3.0    1.0-2.0    0.6-2.0                                                                                                                                                                                                                                                                                    ?                                                 Subhedral                                         Subhedral                                                                                                                                             Replaced by mixed-layer clays, talc, magnetite, pyrite.                                                                                                                                                                                                   Single crystals and glomerocrysts with cpx.                                                                                                                                                                                                               Partially replaced by actinolite and magnetite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Plagioiclase        Clinopyroxene       Magnetite                                                   31   30.9 12             31   31   12             < 0.3      < 0.3      < 0.3                                                                                                                                                                                                                                                                                      ?                                                 ?                                                 ?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Partially replaced by sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Vesicles                   3              0.05-3.00                        Patchy                                                      Chlorite, actinolite                                                                                                    Irregular                                                                                                               Host rock is extensively altered for ~ 0.1-0.3 mm around vesicles.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Clays               Chlorite            Albite              Sphene              Magnetite           Actinolite                                                  3    8    0.1  Tr   Tr   8              Olivine                                 Plag, vugs                                                                      Magnetite                               Olivine, cpx                            Cpx, vugs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       N
G111 0504B146R01021023004 0162 DIV Sparsely olivine plagioclase clinopyroxene phyric basalt                        Subophitic                                                                                          Unit 162                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    1    1              3    1    1              0.3-1.0    0.6-2.0    1.0-3.0                                                                                                                                                                                                                                                                                    Euhedral                                          Euhedral                                          Subhedral                                                                                                                                             Replaced by chlorite + magnetite + pyrite.                                                                                                                                                                                                                Glomerocrysts. Partially replaced by albite.                                                                                                                                                                                                              Fresh.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Plagioclase         Clinopyroxene       Magnetite                                                   39   39   10             39   39   10             < 0.6      < 0.6      < 0.2                                                                                                                                                                                                                                                                                      Subhedral                                         Subhedral                                         Euhedral                                                                                                                                              Partially replaced by albite, zeolites.                                                                                                                                                                                                                   Partially replaced by actinolite.                                                                                                                                                                                                                         Extensively replaced by sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Vugs                       1              0.3-3.0                          Even                                                                                                                                                                                Irregular                                                                                                               Zoned filling in large vug: 1) chlorite + actinolite; 2) zeolites + prehnite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Zeolites            Chlorite            Albite              Actinolite          Sphene              Pyrite              Magnetite                               1    5    1    3    1    Tr   Tr        Plag, vugs                              ol, plag, vugs                          Plag                                    Cpx, vugs                               Magnetite                               Ol                                      Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Disseminated in the matrix.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Plag phenocrysts have glass inclusions. Hourglass and concentric zoning in cpx phenocrysts. the rock is moderately altered (10-20%).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    N
G111 0504B147R01039041006B0163 DIV Aphyric basalt                                                                  Intergranular to subophitic                                                                         Unit 163                                Medium                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Olivine             Titanomagnetite                         50   35   0    2         50   42   6    2         0.15-2.00  0.15-1.0   0.1-0.5    0.15                  An 54                                             Diopside/augite                                                                                                                                                                                         Euhedral,bladed                                   Euhedral-anhedral                                 Euhedral-subhedral                                Euhedral                                                                                            Smaller crystals generally bladed. Some patches of larger crystals accumulated. Seriate texture.                                                                                                                                                          Generally partially encloses plag. Some basal twins.                                                                                                                                                                                                      Replaced in coronal fashion by chlorite, some clay, oxides, pyrite.                                                                                                                                                                                       Replaced by maghemite + sphene?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Sphene              Fe oxides           Talc                Pyrite                                                      7    3    << 1 1.5  < 1  0.5            Olivine, cpx                            Cpx, olivine                            Ti-mag                                  Olivine                                 Olivine                                 Mesostasis(??)                                                                                                          Mixed-layer smectite/chlorite replacing olivine. Clays partially replace cpx.                                                                                                                                                                             Minor cpx replacement. Chlorite + smectite replace ol.                                                                                                                                                                                                    Replaces titanomagnetite to a very small degree.                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Possibly as olivine replacement, especially in cores.                                                                                                                                                                                                     Occurs as minor matrix alteration phase.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Texture suggests that the rock is still a diabase even though it is quite coarse. No distinct phenocrysts although some groundmass crystals are as large as 2 mm. the fact that these larger crystals include smaller crystals suggests that the larger crystals were not entirely intratelluric. The rock clearly grew with a seriate texture. An open fracture (0.15 mm wide) is present, constituting less than 1% of the thin section.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              N
G111 0504B147R02044046001F0163 DIV Aphyric basalt                                                                  intergranular to subophitic (diabasic)                                                              Unit 163                                Medium                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Olivine             Magnetite                               39   50   0    1         40   55   4    1         0.3-1.5    0.2-1.0    0.5        0.2                   An 60(?)                                          Diopside(?)                                                                                                                                                                                             Euhedral, bladed                                  Anhedral                                          Subhedral                                         Euhedral                                                                                            Sometimes form radiating patterns and glomerocrysts.                                                                                                                                                                                                      Largest crystals are anhedral matrix grains.                                                                                                                                                                                                              Replaced by talc + chlorite/mixed-layer clays(?) + pyrite.                                                                                                                                                                                                Partially replaced by sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Vugs                       << 1           0.6                                                                                          Chlorite, pyrite                                                                                                        Irregular                                                                                                               Very minor.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Clays               Chlorite            Sphene              Pyrite              Talc                Oxides                                                      5    4    < 1  < 1  < 1  < 1            Ol, plag                                Ol                                      Magnetite                               Ol, matrix                              Ol                                      Ol                                                                                                                      With chlorite. Replaces olivine and minor amounts of plag.                                                                                                                                                                                                With clays (smectite). Mixed-layer clay.                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Replaces matrix grains up to 0.4 mm.                                                                                                                                                                                                                      Partial replacement of olivine.                                                                                                                                                                                                                           Minor replacement of olivine.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Large cpx crystals totally enclose plag crystals. Some cpx crystals show undulose extinction possibly due to strain caused by crystallization pressure(?). Some large plagioclase crystals have rare altered glass inclusions. Tentative crystallization order: plag-ol-cpx. Generally, alteration zone common around altered ol crystals.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              N
G111 0504B147R02108112001N0163 DIV Sparsely clinopyroxene plagioclase olivine phyric basalt                        Intergranular to subophitic                                                                         Dyke center. Unit 163                   Aphanitic to medium                                                              Olivine             Plagioclase         Clinopyroxene                                               0    1    2              < 1  2    2              ~ 0.5      1          1                                                                                                                                                                                                                                                                                          Euhedral                                          Subhedral                                         Subhedral                                                                                                                                             Replaced by talc/chlorite + minor actinolite.                                                                                                                                                                                                             Fractured. Single crystals and glomerocrysts. Altered to clays, especially along cleavage traces.                                                                                                                                                         Contain euhedral plag inclusions. Partially altered to chlorite and acicular actinolite. Sometimes twinned.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Plagioclase         Clinopyroxene       Olivine             Magnetite           Apatite(?)          </=2530   0    53   < 1  30   32   3    3    < 1  0.05-0.50  0.05-0.70  < 0.3      0.1        0.05                                                                                                                                                                                                                                                                 Prismatic, bladed                                 Subhedral                                         Subhedral                                         Subhedral                                         Euhderal                                          Often partially or completely enclosed in cpx. Rare palmate texture. Variably altered up to 25%.                                                                                                                                                          Vary from small groundmass crystals oikocrystal 0.7-1 mm(?). Replaced on margins by actinolite +/- chlorite.                                                                                                                                              Replaced by chlorite + actinolite +/- clays.                                                                                                                                                                                                              Partially replaced by sphene.                                                                                                                                                                                                                             Occur as minor inclusions in plag.                                                                                                                                                                                                                         Vugs                       3              1                                Even                                                        Chlorite, actinolite, oxides                                                                                            Irregular                                                                                                                                              Occur in small areas of finer grained groundmass. Could be interpreted as crystallization controlled by volatiles. Therefore, not true vugs, but clearly p referential alteration of groundmass(???) to (see main comments)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Clays               Chlorite            Actinolite          Sphene              Magnetite           Pyrite                                                      12   10   10   52   2    1              Ol(?), plag, groundmass                 Ol, matrix                              Ol                                      Ti-magnetite                            Ol, groundmass                          Ol                                                                                                                      Patchy distribution in groundmass due to alteration of plag, olivine(?).                                                                                                                                                                                  Replaces olivine phenocrysts and matrix. Also in vugs.                                                                                                                                                                                                    Chlorite replacing olivine and cpx. Patchy distribution.                                                                                                                                                                                                  Replaces some titanomagnetite.                                                                                                                                                                                                                            Some groundmass sphene appears secondary. Also occurs in olivine.                                                                                                                                                                                         Replaces olivine. Also occurs in vuggy patches.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               GROUNDMASS CONTINUED:  Zircon  < 1   < 1  0.05   Subhedral   Occurs as minor inclusions in plag.  VUG COMMENTS CONTINUED: Chlorite + actinolite + oxide.    MAIN COMMENTS:  Not well defined euhedral phenocrysts except for ol (now pseudomorphs after ol). Plag shows palmate growth in places. Larger (phenocrysts?) of cpx are poikilitic and enclose stubbier crystals of plag. Larger plag crystals are generally quite altered to clays(?), up to 30%. Actinolite/chlorite partially replaces ol + cpx. Patchy distribution in groundmass may be vug-filling phases; groundmass texture is often finer grained in these areas.                                                                                                                                                                                                                                                                                                                                                                                                   N
G111 0504B147R02108111001N0163 DIV Sparsely olivine phyric basalt                                                  Intersertal to subophitic                                                                           Unit 163                                Fine to aphanitic                                                                Olivine                                                                                             0                        < 1                      < 1                                                                                                                                                                                                                                                                                                              Subhedral-euhedral                                                                                                                                                                                                                                        Completely altered to talc +/- mixed-layer clays + chlorite + actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clinopyroxene       Plagioclase         Titanomagnetite                                             44   40   < 10           45   40   < 10           ?          ?          ?                                                                                                                                                                                                                                                                                          Anhedral-subhedral                                Tabular                                           Euhedral-subhedral                                                                                                                                    Fresh or altered to actinolite in the halos.                                                                                                                                                                                                              Fresh or slightly altered to chlorite in fissures.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Vugs                       5              < 2                              Halos                                                       Chlorite                                                                                                                Irregular                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Clays               Prehnite            Chlorite            Albite              Actinolite          Sphene              Sulfides            Maghemite(?)        2    Tr   3    Tr   Tr   Tr   Tr   Tr   Olivine, matrix                         Veins, vugs                             Olivine, matrix                         Plag                                    Cpx, vugs                               Ti-magnetite                            Olivine, matrix                         Magnetite                               Brownish.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Green pleochroic. Sometimes as spherulites.                                                                                                                                                                                                               Some plag recrystallized to albite.                                                                                                                                                                                                                       Prismatic crystals (with good cleavage traces visible) and needles replacing cpx. Also in mesostasis and vugs.                                                                                                                                            In the groundmass, particularly in the halos.                                                                                                                                                                                                             Mainly pyrite with traces of chalcopyrite in the interstices.                                                                                                                                                                                             Darker than magnetite in reflected light (sphene? or leucoxene?).                                                                                                                                                                                         Actual interval is from 108-112 cm, however the succeeding thin section had the same ID.  Some vugs filled with a colorless mineral. Patchy aggregates of a mosaic-like aluminosillicate (zeolite?) with first order gray to white interference colors, possibly laumontite, associated with disseminated actinolite needles. Alteration minerals occur in the following proportions: 50% chlorite, clays 30%, 10% actinolite, 7% sulfides, and trace amounts of the remaining minerals.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                N
G111 0504B148R01018021003 0164 DIV Sparsely plagioclase olivine phyric basalt                                      Ophitic                                                                                             Unit 164                                Fine                                                                             Olivine             Plagioclase                                                                     0    7                   2    7                   0.4-3.0    0.1-3.0                                                                                                                                                                                                                                                                                               Euhedral                                          Euhedral                                                                                                                                                                                                Replaced by mixed-layer clays + talc + magnetite + pyrite.                                                                                                                                                                                                Single crystals and glomerocrysts. Partially replaced by clays and albite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Olivine             Magnetite           Spinel              36.9 37   0    7    < 0.136.9 37   10   7    < 0.1< 0.3      < 0.3      < 0.3      < 0.3      0.15                                                                                                                                                                                                                                                                 Subhedral                                         Subhedral                                         Subhedral                                         Euhedral                                          Subhedral                                         Partially replaced by clays.                                                                                                                                                                                                                              Slightly replaced by actinolite.                                                                                                                                                                                                                          Replaced by mixed-layer clays.                                                                                                                                                                                                                            Slightly replaced by sphene.                                                                                                                                                                                                                              single crystal in ol pseudomorph.                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Albite              Actinolite          Sphene              Pyrite                                                                          12   Tr   Tr   Tr   0.1                 Ol                                      Plag                                    Cpx                                     Magnetite                               Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Ol pseudomorphs are sometimes zoned: mixed-layer clays in the center, rimmed by talc.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   N
G111 0504B148R01061063009 0164 DIV Moderately plagioclase clinopyroxene olivine phyric basalt                      Subophitic                                                                                          Unit 164                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    1    1              1    1    1              0.4-0.6    0.6-1.0    0.9-3.0                                                                                                                                                                                                                                                                                    Subhedral                                         Subhedral                                         Subhedral                                                                                                                                             Replaced by mixed-layer clays + talc + magnetite + pyrite.                                                                                                                                                                                                Glomerocrysts. Partially replaced by clays, albite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Plagioclase         Clinopyroxene       Olivine             Magnetite                               41   41   0    7         41   41   1    7         < 0.6      < 0.6      < 0.4      < 0.6                                                                                                                                                                                                                                                                           ?                                                 ?                                                 ?                                                 ?                                                                                                   Partially replaced by clays, albite.                                                                                                                                                                                                                      Partially replaced by actinolite.                                                                                                                                                                                                                         Replaced by mixed-layer clay, talc, magnetite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Vugs                       < 1            < 0.3                                                                                        Clays                                                                                                                   Irregular                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Clays               Albite              Actinolite          Sphene                                                                                              8    Tr   1    Tr                       Ol, plag, vugs                          Plag                                    Cpx                                     Magnetite                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       N
G111 0504B148R01071073010 0164 DIV Aphyric basalt                                                                  Subophitic, glomerophyric                                                                           Unit 164                                Medium                                                                           Clinopyroxene                                                                                       < 1                      < 1                      1.5                                                                                                                                                                                                                                                                                                              Subhedral                                                                                                                                                                                                                                                 Partially altered to actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Plagioclase         Clinopyroxene       Olivine             Magnetite                               40   25   0    5         50   35   10   5         < 1.0      < 1.0      < 1.0      < 1.0                                                                                                                                                                                                                                                                           Subhedral-anhedral                                Subhedral                                         Anhedral-subhedral                                Euhedral                                                                                            Altered to actinolite +/- chlorite (+/- albite). Crystals are zoned. Glomerocrysts abundant.                                                                                                                                                              Altered to actinolite.                                                                                                                                                                                                                                    Altered to actinolite +/- chlorite +/- pyrite.                                                                                                                                                                                                            Partially altered to maghemite + sphene(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Actinolite                                                                                                                                  10   20                                 Plag, ol                                Cpx, plag, ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   N
G111 0504B149R01082084013B0164 DIV Highly plagioclase olivine clinopyroxene phyric basalt                          Intergranular to subophitic                                                                         Unit 164                                Medium                                                                           Olivine             Plagioclase         Clinopyroxene                                               0    8    2              5    10   3              0.5-1.0    0.5-1.0    1.0-3.0                                                                                                                                                                                                                                                                                    Anhedral-subhedral                                Subhedral-euhedral                                Subhedral                                                                                                                                             Altered to chlorite +/- actinolite +/- pyrite.                                                                                                                                                                                                            Altered to chlorite +/- actinolite.                                                                                                                                                                                                                       Altered randomly to actinolite. Glomerocrysts abundant.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Plagioclase         Clinopyroxene       Olivine             Magnetite                               30   20   0    10        35   25   12   10        < 0.5      < 0.5      < 0.5      < 0.5                                                                                                                                                                                                                                                                           Euhedral-subhedral                                Subhedral                                         Anhedral                                          Euhedral                                                                                            Altered to ab +/- chlorite +/- actinolite.                                                                                                                                                                                                                Altered to actinolite +/- chlorite.                                                                                                                                                                                                                       Altered to chlorite +/- actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Actinolite          Pyrite                                                                                                                  12   18   < 1                           Ol, plag, +/- cpx                       Ol, plag, cpx                           Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Chalcopyrite traces in pyrite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      N
G111 0504B149R02057059007 0164 DIV Sparsely plagioclase olivine clinopyroxene phyric basalt                        Spherulitic, intergranular                                                                          Unit 164                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    4    0.1            3    5    0.1            0.15-0.50  0.30-1.20  0.6                                                                                                                                                                                                                                                                                        Euhedral                                          Euhedral                                          Subhedral                                                                                                                                             Replaced by chlorite + mixed-layer clay.                                                                                                                                                                                                                  Extensively replaced by albite, zeolites, clays. Single crystals and glomerocrysts.                                                                                                                                                                       One fresh crystal.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Plagioclase         Clinopyroxene       Magnetite                                                   31.9 33   10             32.9 33   0              < 0.2      < 0.2      < 0.2                                                                                                                                                                                                                                                                                      Euhedral                                          Subhedral                                         Euhedral, skeletal                                                                                                                                    Microlites.                                                                                                                                                                                                                                               Spherulites. Cloudy (partially altered to actinolite?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Vug                        1              10                                                                                           See comments                                                                                                                                                                                                                                    Filled sequentially: 1) chlorite + fibrous actinolite + euhedral, 150 micron sphene; 2) zeolites, probably laumontite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Clays               Zeolites            Albite              Actinolite          Sphene              Chlorite                                                    5    3    5    5    2    Tr             Olivine, plag                           Plag                                    Plag                                    Cpx, veinlets                                                                   Veinlets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Sample intruded by glassy plag-olivine-cpx basalt. Galss + olivine totally altered to clays + chlorite + sphene. Plag replaced by albite. Host dike is extensively altered adjacent to the intrusive dike and vug.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      N
G111 0504B150R01054056012 0166 DIV Highly plagioclase clinopyroxene olivine phyric basalt                          Microlitic, felted                                                                                  Unit 166                                Aphanitic to fine                                                                Olivine             Plagioclase         Clinopyroxene                                               0    7.5  2              2    8    2              0.3-1.5    0.1-3.0    ~ 0.3                                                                              An 55                                                                                                                                                                                                   Euhedral                                          Euhedral                                          Euhedral                                                                                                                                              Pseudomorphs. Replace  in zones by actinolite, chlorite, monor smectite, oxide, pyrite. Oxides along cleavage  traces.                                                                                                                                    Single crystals and glomerocrysts with olivine or cpx. Partially altered to clays.                                                                                                                                                                        Glomerocrysts with pl;ag and single crystals. Often twinned.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Plagioclase         Clinopyroxene       Olivine             Oxide                                   35   38   0    8         40   > 40 2(?) 8         ?          ?          ?          ?                                                                                                                                                                                                                                                                               ?                                                 ?                                                 ?                                                 ?                                                                                                   Minor alteration to clays, chlorite.                                                                                                                                                                                                                      Minor alteration to chlorite, actinolite.                                                                                                                                                                                                                 Altered to actinolite +/- chlorite(?).                                                                                                                                                                                                                    Some monor alteration to sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Pyrite                                                                                              2.5  3    3    < 1                      Plag                                    Cpx, ol                                 Ol                                      Ol                                                                                                                                                                                                      Minor replacement of plag.                                                                                                                                                                                                                                minor amounts in plag                                                                                                                                                                                                                                     Minor replacement of groundmass cpx. Pseudomorphs after olivine.                                                                                                                                                                                          Very minbor alteration of ol.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Groundmass is fine grained (microlitic texture), and essentially looks like porphyritic volcanic basalt. This could be due to sample proximity to chilled margin of dike. the amount of matrix alteration is difficult to estimate, probably ~ 5%.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      N
G111 0504B150R01113115022A0167 DIV Sparsely plagioclase olivine phyric basalt                                      Subophitic                                                                                          Unit 167                                Fine to medium                                                                   Olivine             Plagioclase                                                                     0    < 2                 < 2  3                   ?          2                                                                                                                                                                                                                                                                                                     ?                                                 Tabular                                                                                                                                                                                                 Altered to mixed-layer clays + talc + pyrite+ actinolite.                                                                                                                                                                                                 Patchy extinction.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Plagioclase         Clinopyroxene       Opaques                                                     35   50   < 5            35   50   5              </= 1      </= 1      0.2                                                                                                                                  Ti-mag                                                                                                                                                Tabular                                           Anhedral                                          Skeletal                                                                                                                                              Fresh. Euhedral tabular to acicular.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Maghemite(?) also present.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Opaques             Sphene                                                                          1.0  6.0  0.5  0.5  Tr                  Ol, matrix                              Ol, veinlets                            Ol, matrix                              Ol                                      Magnetite                                                                                                                                                       Expandable chlorite/clay mixture. Alteration of ol, and in mesostasis.                                                                                                                                                                                    Also in interstices. Forms along cracks in plag. Chlorite + expandable clays from after olivine.                                                                                                                                                          Also in interstices.                                                                                                                                                                                                                                      Pyrite replaces ol and fills interstices. One crystal of chalcopyrite.                                                                                                                                                                                    In matrix and in chlorite veins.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Open fracture (horizontal strike) with no surrounding alteration halo.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  N
G111 0504B151R01004007001B0168 DIV Aphyric basalt                                                                  Subophitic, glomerophyric                                                                           Unit 168                                Medium                                                                           Olivine             Clinopyroxene                                                                   0    < 1                 < 1  < 1                 1.0-1.5    1.0-2.5                                                                                                                                                                                                                                                                                               Subhedral                                         Subhedral-euhedral                                                                                                                                                                                      Altered to 1) mixed-layer clays +/- chlorite +/- actinolite +/- pyrite +/- magnetite; 2) Actinolite +/- chlorite +/- pyrite +/- magnetite. Alteration is zonal in places: cores altered predominantly to actinolite; margins altered to(see main comments)Partially altered to actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Plagioclase         Clinopyroxene       Olivine             Magnetite                               40   25   0    5         50   35   10   5         < 1.0      < 1.0      < 1.0      < 1.0                                                                                                                                                                                                                                                                           Euhedral-subhderal                                Subhedral                                         Subhedral                                         Anhedral                                                                                            Altered to chlorite + actinolite.                                                                                                                                                                                                                         Altered to actinolite.                                                                                                                                                                                                                                    Altered to actinolite + chlorite +/- mixed-layer clays.                                                                                                                                                                                                   Partially altered to maghemite = sphene(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Actinolite                                                                                                                                  10   20                                 Plag, ol                                Cpx, plag, ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Continuation of olivine phenocryst comments: chlorite + mixed-layer clays +/- actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               N
G111 0504B152R01005008002 0170 DIV Moderatley plagioclase clinopyroxene olivine phyric basalt                      Subophitic, recrystallized                                                                          Unit 170                                Fine to medium                                                                   Olivine             Plagioclase         Clinopyroxene                                               0    3    1              1    7    2              0.3-2.0    ~ 1        ~ 0.5                                                                                                                                                                                                                                                                                      Subhedral                                         Subhedral                                         Subhedral                                                                                                                                             Altered to chlorite + talc + actinolite + magnetite + pyrite.                                                                                                                                                                                             Recrystallized. Highly fractured.                                                                                                                                                                                                                         Partially altered to actinolite + chlorite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Plagioclase         Clinopyroxene       Olivine             Magnetite                               10(?)5(?) 0    1         45   35   8    2         ?          ?          ?          ?                                                                                                                                                                                                                                                                               ?                                                 ?                                                 ?                                                 ?                                                                                                   Recrystallized.                                                                                                                                                                                                                                           Altered predominantly to chlorite and some actinolite.                                                                                                                                                                                                    Altered to chlorite + actinolite +/- talc.                                                                                                                                                                                                                Altered to maghemite + sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Sphene              Plagioclase         Maghemite           Pyrite              Talc                6    ~ 21 20   1    30   1    < 1  < 1  Olivine                                 Plag (?)                                Cpx                                     Magnetite                               Plag                                    Magnetite                               Ol                                      Ol                                      Replaces ol phenocrysts and groungmass crystals. Also replaces cpx. Includes smectite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        Partially replaces magnetite and groundmass.                                                                                                                                                                                                              Recrystallized primary plag. Could be partially albitized.                                                                                                                                                                                                                                                                                                                                                                                                                                                          Replacement of groundmass ol?                                                                                                                                                                                                                             Partial replacement of ol.                                                                                                                                                                                                                                Rock is heavily altered. Considerable amount of chloritzation occurs in patches. Replacement by actinolite is extensive, especially in the cores of large cpx crystals and in the centers of chlorite patches. Plag crystals are highly fractured and recrystallized.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   N
G111 0504B152R01005008002 0169 DIV Sparsely olivine plagioclase phyric basalt                                      Microlitic, cryptocrystalline                                                                       Unit 169, chilled margin                Very fine to fine                                                                Olivine             Plagioclase                                                                     0    < 1                 < 1  < 1                 1          < 1                                                                                                                                                                                                                                                                                                   Subhedral                                         Euhedral                                                                                                                                                                                                Only one glomerocryst. Altered to talc + magnetite + chlorite + smectite.                                                                                                                                                                                 Single crystals and glomerocrysts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Matrix                                                                                              0                        99                       ?                                                                                                                                                                                                                                                                                                                ?                                                                                                                                                                                                                                                         Cryptocrystalline. Glass altered to chlorite + smectite + mixed-layer clays(?) + oxides.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Talc                Magnetite(?)        Actinolite                                                                                          < 1                 Ol, matrix                              Ol, matrix                              Ol                                      Ol, matrix                              Vein                                                                                                                                                            Percentages of secondary minerals were not estimated since replacement was of cryptocrystalline/glassy matrix.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          0.5 mm-wide vein. Actinolite at outer margins, laumontite in center.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Small inclusions of adjacent dike matrix found in glassy margin of Unit 169.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            N
G111 0504B152R01081084012 0173 DIV Sparsley plagioclase clinopyroxene olivine phyric basalt                        Subophitic, glomerophyric                                                                           Crystalline part ofUnit 173             Fine to medium                                                                   Olivine             Plagioclase         Clinopyroxene                                               0    1    1              1    2    1              </= 1.5    </= 2.0    </= 1.5                                                                                                                                                                                                                                                                                    Subhedral                                         Euhedral-subhedral                                Subhedral                                                                                                                                             Altered to chlorite +/- actinolite.                                                                                                                                                                                                                       Altered to chlorite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Plagioclase         Clinopyroxene       Olivine             Magnetite                               30   20   0    11        45   30   10   11        < 0.2      < 0.2      < 0.2      < 0.2                                                                                                                                                                                                                                                                           Subhedral-euhedral                                Subhedral                                         Subhedral                                         Subhedral                                                                                           Altered to chlorite.                                                                                                                                                                                                                                      Altered to chlorite +/- actinolite.                                                                                                                                                                                                                       Altered to chlorite +/- actinolite +/- mixe -layer clays.                                                                                                                                                                                                 Partially altered to sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Sphene              Magnetite                                                                       10   15   6    < 1  5                   Ol, plag                                Ol, plag, cpx                           Ol, cpx                                 Magnetite                               Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      N
G111 0504B152R01081084012 0174 DIV Moderately plagioclase clinopyroxene olivine phyric basalt                      Subophitic, single crystals                                                                         Unit 174, chilled margin                Glassy to cryptocrystalline                                                      Olivine             Plagioclase         Clinopyroxene                                               0    4    2              < 1  5    2              </= 2.0    </= 2.0    </= 2.0                                                                                                                                                                                                                                                                                    Subhedral                                         Subhedral                                         Subhedral                                                                                                                                             Altered to actinolite +/- chlorite.                                                                                                                                                                                                                       Altered to chlorite. Glomerocrysts with cpx.                                                                                                                                                                                                              Randomly altered to chlorite(?). Glomerocrysts with plag.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Plagioclase         Olivine             Matrix                                                      30   0    51             30   10   53             < 0.2      < 0.2      ?                                                                                                                                                                                                                                                                                          Subhedral                                         Euhedral-subhedral                                ?                                                                                                                                                     Partially (< 1%) altered to chlorite.                                                                                                                                                                                                                     Altered to chlorite +/- actinolite +/- magnetite.                                                                                                                                                                                                         Recrystallized. Altered to chlorite +/- Fe hydroxide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Actinolite          Magnetite                                                                                                               10   3    < 1                           Ol, plag, veins                         Ol                                      Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Glass rim is < 0.3 mm - cryptocrystalline.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              N
G111 0504B152R01123126020 0175 DIV Highly plagioclase clinopyroxene olivine phyric basalt                          Intergranular, spherulitic                                                                          Unit 175                                Fine                                                                             Olivine             Plagioclase         Clinopyroxene                                               0    15   5              2    15   5              0.3-1.2    0.2-2.0    0.2-2.0                                                                                                                                                                                                                                                                                    Euhedral                                          Euhedral                                          Subhedral, tabular                                                                                                                                    Altered to mixed-layer clays + pyrite.                                                                                                                                                                                                                    Single crystals and glomerocrysts. Slightly altered to clays along fractures. Some crystals are zoned.                                                                                                                                                    Single crystals and glomerocrysts with plag.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Plagioclase         Clinopyroxene       Olivine             Magnetite                               30   30   0    10        30   30   5    10        < 0.2      < 0.2      < 0.2      0.003-0.015                                                                                                                                                                                                                                                                     Skeletal, bow-tie                                 Skeletal                                          Rounded                                           Euhedral, skeletal                                                                                                                                                                                                                                                                                                                                            Also plumose and spherulitic crystals.                                                                                                                                                                                                                    Altered to mixed-layer clays.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Vugs                       3              < 0.15                           Dispersed                                                   Clays                                                                                                                   Irregular                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Clays               Pyrite                                                                                                                                      10   Tr                                 Ol, vugs                                Ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              N
G111 0504B153R01093095014 0176 DIV Sparsely olivine clinopyroxene phyric basalt                                    Ophitic                                                                                             Unit 176                                Fine                                                                             Olivine             Clinopyroxene                                                                   0    0.5                 2    0.5                 1.0-2.5    3.0                                                                                                                                                                                                                                                                                                   Euhedral                                          Subhedral                                                                                                                                                                                               Altered to mixed-layer clays + magnetite + pyrite.                                                                                                                                                                                                        One single crystal.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Plagioclase         Clinopyroxene       Olivine             Magnetite                               37.8 37.2 6    8         37.8 37.2 6    8         < 0.1      < 0.6      < 0.5      0.03-1.50                                                                                                                                                                                                                                                                       Subhedarl                                         Subhedral                                         Subhedral                                         Euhedral                                                                                            Partially altered to clays + albite.                                                                                                                                                                                                                      Partially altered to actinolite.                                                                                                                                                                                                                          Altered to mixed-layer clays + magnetite + pyrite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Albite              Actinolite          Sphene                                                                          10   0.1  0.2  0.1  0.1                 Olivine, plag                           Plag, ol                                Plag                                    Cpx                                     Magnetite                                                                                                                                                                                                                                                                                                                                                                                                                 Minor replacement of plag and ol.                                                                                                                                                                                                                         Minor replacement of plag.                                                                                                                                                                                                                                Minor replacement of cpx.                                                                                                                                                                                                                                 Minor replacement of magnetite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 N
G111 0504B154R01064066004B0176 DIV Aphyric basalt                                                                  Subophitic, glomerophyric                                                                           Unit 176                                Medium                                                                           Olivine             Plagioclase         Clinopyroxene                                               0    < 1  < 1            < 1  < 1  < 1            1.0-1.5    1.0-1.5    1.0-1.5                                                                                                                                                                                                                                                                                    Subhedral                                         Euhedral                                          Subhedral                                                                                                                                             Altered to actinolite +/- mixed-layer clays +/- chlorite +/- talc(?) +/- pyrite +/- magnetite. Zonal alteration pattern: core altered to actinolite +/- mixed-layer clays + pyrite; rim altered to actinolite + magnetite.                                Altered to actinolite + chlorite.                                                                                                                                                                                                                         Partially altered to actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Olivine             Magnetite                               40   25   0    5         50   35   10   5         < 1.0      < 1.0      < 1.0      < 1.0                                                                                                                                                                                                                                                                           Euhedral-subhedral                                Subhedral-anhedral                                Anhedral                                          Euhedral                                                                                            Altered to actinolite + chlorite.                                                                                                                                                                                                                         Altered to actinolite.                                                                                                                                                                                                                                    Altered to actinolite +/- chlorite +/- mixed-layer clays +/- talc(?) +/- pyrite +/- magnetite.                                                                                                                                                            Partially altered to maghemite (sphene?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Actinolite                                                                                                                                  10   20                                 Plag, ol                                Cpx, plag, ol                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Disseminated pyrite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    N
G111 0504B155R01043045008 0176 DIV Sparsely plagioclase clinopyroxene olivine phyric basalt                        Subophitic (diabasic)                                                                               Unit 176                                Fine to medium                                                                   Olivine             Plagioclase         Clinopyroxene                                               0    < 1  < 1            < 1  < 1  < 1            1.5        1.5        2                                                                                                                                    Augite/diopside                                                                                                                                       Euhedral                                          Subhedral                                         Euhedral                                                                                                                                              Zonally replaced: margins altered to talc; core altered to actinolite + pyrite.                                                                                                                                                                           Expansion cracks.                                                                                                                                                                                                                                         Poikilitically enclose stubby plag.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Plagioclase         Clinopyroxene       Olivine             Magnetite                               50   37   0    3         55   43   5    5         < 0.1-1.0  0.15-0.50  0.15       < 0.15                An 52                                             Diopside/augite                                                                                                                                                                                         Euhedral, bladed                                  Anhedral-subhedral                                Anhedral                                          Anhedral                                                                                            Minor alteration to clays.                                                                                                                                                                                                                                Subophitic with plag.                                                                                                                                                                                                                                     Completely altered to chlorite +/- pyrite +/- magnetite.                                                                                                                                                                                                  Partially altered to maghemite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Pyrite              Maghemite           Talc                                                        < 1  6    < 1  < 1  <2(?)< 1            Plag                                    Ol, cpx                                 Ol                                      Ol                                      Magnetite                               Ol                                                                                                                      Partial replacement of plag.                                                                                                                                                                                                                              Replacement of groundmass ol, minor replacement of cpx.                                                                                                                                                                                                   Replacement of ol phenocryst cores.                                                                                                                                                                                                                       Partial replacement of groundmass ol.                                                                                                                                                                                                                     Replacement of magnetite?                                                                                                                                                                                                                                 Replacement of ol phenocryst margins.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         Open fracture, 1 mm wide, 0.5 mm from top of piece. Rock is fairly fresh with the exception of ol crystals. Ol is altered to talc +/- chlorite + actinolite +/- pyrite +/- magnetite. This alteration produces expansion which results in fractured plag, etc.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          N
G111 0504B157R01002005001 0179 DIV Moderately plagioclase clinopyroxene olivine phyric basalt                      Glomeroporphyritic, microlitic                                                                      Unit 179, near a contact with a (cont.) Very fine                                                                        Olivine             Plagioclase         Clinopyroxene                                               0.5  2    1              1    2    1              1.0-3.0    1.0-3.0    1.0-3.0                                                                                                                                                                                                                                                                                    Subhedral                                         Euhedral, tabular                                 Euhedral-subhedral                                                                                                                                    Fresh or altered to 1) talc + magnetite +/- pyrite; 2) chlorite + actinolite + pyrite.                                                                                                                                                                    Glomerocrysts. Recrystallized. Chlorite alteration along cracks.                                                                                                                                                                                          Fresh. Some elongated crystals. Some crystals altered to actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Plagioclase         Clinopyroxene       Titanomagnetite                                             21   52   7              21   62   13             0.2        < 0.1      < 0.1                                                                                                                                                                                                                                                                                      Euhedral,tabular                                  Quenched                                          Skeletal,euhedral                                                                                                                                     Also acicular morphology present.                                                                                                                                                                                                                         Cryptocrystalline to small sheaves.                                                                                                                                                                                                                       Also subhedral morphology present. Altered to maghemite(?), sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Vugs                       < 1            < 1                              Interstitial                                                Chlorite                                                                                                                Irregular                                                                                                               Some vugs in an altered ol crystal (now talc + magnetite); filled with fibrous mineral (zeolite?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Zeolites            Chlorite            Albite              Actinolite          Sphene              Plagioclase         Opaques                                 < 1  5    < 1  3    < 5  < 1  2         Vugs                                    Veins                                   Plag                                    Veins                                   Ti-mag, veins                           Plag                                    Olivine, vein, groundmass                                                       Filling vugs in ol. Interstitial between plag and olivine crystals which form glomerocrysts.                                                                                                                                                              Forms the core of actinolite veins. Also as discrete veins.                                                                                                                                                                                               Possibly after recrystallized plag.                                                                                                                                                                                                                       Abundant needles in veins and in halos. Formed as needles, and bladed crystals. Also as crystal nuclei.                                                                                                                                                   After titanomagnetite and in chlorite veins.                                                                                                                                                                                                              Possibly after recrystallized plag (instead of albite).                                                                                                                                                                                                   Scarce pyrite in groundmass and in altered ol. secondary magnetite in ol which is now altered to talc and is associated with actinolite and chlorite veins.                                                                                                                                                                                                                                                                                                                                                         WHERE SAMPLED CONTINUED: coarser grained rock.  MAIN COMMENTS:  Veins are filled predominantly with actinolite and with chlorite. Plag appears recrystallized near actinolite veins. An actinolite vein is cross cut by a chlorite + sphene vein. Another larger vein shows that chlorite + sphene veins occur in a more internal position than actinolite. Actinolite is also common in alteration halos around veins as partial replacement of cpx crystals. groundmass is microcrystalline to microlitic.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            N
G111 0504B157R01027031005 0181 DIV Moderately plagioclase clinopyroxene olivine phyric basalt                      Glomeroporphyritic, microlitic                                                                      Unit 181, at the contact with(continued)Very fine                                                                        Olivine             Plagioclase         Clinopyroxene                                               0    < 2  0.5            1    2    1              1.0-2.0    1.0-2.0    < 1                                                                                                                                                                                                                                                                                        Subhedral                                         Tabular                                           Subhedral                                                                                                                                             Completely altered to chlorite + actinolite + opaques.                                                                                                                                                                                                    Partially recrystallized. Altered to chlorite + actinolite along  cracks.                                                                                                                                                                                 Partially altered to actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Titanomagnetite                                             30   50   2              30   60   5              < 1        < 0.5      < 0.2                                                                                                                                                                                                                                                                                      Tabular, acicular                                 Anhedral                                          Skeletal                                                                                                                                              Microlites.                                                                                                                                                                                                                                               Altered to actinolite(?).                                                                                                                                                                                                                                 Altered to maghemite(?) and sphene in the coarser grained portion.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Zeolites            Chlorite            Albite              Actinolite          Sphene              Opaques                                                     Tr   4    1    10   Tr   1              Vein                                    Ol, veins                               Plag, veinlets                          Ol, cpx, veins                          Opaques                                                                                                                                                         Possibly laumontite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Alteration of primary plag phenocrysts.                                                                                                                                                                                                                   The most abundant phase in veins and halos.                                                                                                                                                                                                               After oxides, both primary and secondary.                                                                                                                                                                                                                 Mainly magnetite maghemite(?). Some elongated pyrite crystals along a tiny veinlet.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           WHERE SAMPLED CONTINUED: coarser grained rock.  MAIN COMMENTS: Two generations of veins: 1) actinolite + chlorite + opaques, which is cut by 2) white mineral (ab) + chlorite. Second vein is chlorite at the contact with the first vein. Two veins consist of an ab core surrounded by a colorless to pale brown mineral with anomalous brown birefringence and good cleavage. Groundmass is cryptocrystalline to microlitic.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         N
G111 0504B158R01012014002 0182 DIV Aphyric basalt                                                                  Massive, subophitic                                                                                 Unit 182                                Fine                                                                             Plagioclase                                                                                         < 0.5                    < 0.5                    0.5                                                                                                                                                                                                                                                                                                              Euhedral-subhedral                                                                                                                                                                                                                                        Chloritization beginning along fractures.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clinopyroxene       Plagioclase         Magnetite           Olivine             Zircon              39   35   10   0    <<0.541   36   17   4    < 0.5< 0.2      < 0.3      < 0.2      < 0.2      <0.005                                                                                                                                                                                                                                                               Subhedral-anhedral                                Laths, euhedral                                   Subhedral-euhedral                                Subhedral                                         Euhedral                                          Slightly altered to actinolite.                                                                                                                                                                                                                           Chloritization beginning. Fluid inclusions.                                                                                                                                                                                                               Replaced by sphene.                                                                                                                                                                                                                                       Altered to chlorite and mixed-layer clays.                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Sphene                                                                                              2    3    2    7                        Ol                                      Ol, plag                                Cpx                                     Magnetite                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               GROUNDMASS CONTINUED: Mineral = apatite, % present = << 0.5, % original = < 0.5, size = < 0.005 mm, morphology = euhedral. Mineral = pyrite, % present = 1.5, % original = 1.5, size = < 0.2 mm, morphology = euhedral, comment = slightly disseminated in groundmass.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  N
G111 0504B158R01016018003A0182 DIV Aphyric basalt                                                                  Microlitic                                                                                          Unit 182                                Very fine to aphanitic                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Titanomagnetite                                             30   50   10             30   55   15             0.2        < 0.1      < 0.2                                                                                                                                                                                                                                                                                      Tabular, acicular                                 Quenched                                          Skeletal,euhedral-                                                                                                                                                                                                                                                                                                                                                                                              Sheaves of skeletal cpx. Fresh except in the halo, where altered to actinolite needles.                                                                                                                                                                   Morphology continued: subhedral. COMMENTS: Altered to maghemite(?), sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Zeolites            Chlorite            Actinolite          Sphene              Opaques                                                                         Tr   3    6    1    Tr                  Veins                                   Veins, halos                            Cpx, veins                              Magnetite                                                                                                                                                                                               Probably laumontite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Replaces primary Ti-mag and secondary oxides.                                                                                                                                                                                                             Magnetite. secondary magnetite is generally larger sized with more variability in size. Scarce pyrite in interstices between microlites.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Groundmass is microlitic and partially replaced by actinolite in halos. One vein (0.3 mm wide) is filled with fibrous actinolite + minor chlorite + scarce sphene and zeolite (Laumontite?). Other veins are perpendicular to the length of the slide; these contain elongated magnetite + actinolite + minor chlorite (in the vein and in the halos, < 1 mm) and cross cut the first vein described. Both primary and secondary magnetite can be altered to sphene. Darker grey magnetite in reflected light is described as maghemite, but is more probably sphene or leucoxene(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                   N
G111 0504B158R01032034004 0182 DIV Sparsely plagioclase phyric to aphyric basalt                                   Cryptocrystalline to microlitic                                                                     Unit 182                                Very fine to aphanitic                                                           Plagioclase                                                                                         < 1                      < 1                      </= 1                                                                                                                                                                                                                                                                                                            Tabular                                                                                                                                                                                                                                                   Patchy extinction, probably recrystallized to Ab.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Clinopyroxene       Plagioclase         Titanomagnetite                                             70   15   2              80   15   5              ?          ?          ?                                                                                                                                                                                                                                                                                          Skeletal                                          Tabular                                           Skeletal                                                                                                                                              Quenched crystals, needles forming sheaves.                                                                                                                                                                                                               Fresh.                                                                                                                                                                                                                                                    Partiallt altered to maghemite(?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Albite              Actinolite          Sphene              Quartz              Opaques             Zeolite             Tr   7    < 1  1    Tr   1    < 1  2    Vein                                    Veins                                   Plag                                    Veins                                   Magnetite                               Veins                                   Ti-mag                                  Vein                                    Brownish clay inside a segment of chlorite vein.                                                                                                                                                                                                          Blue-gray birefringence in veins.                                                                                                                                                                                                                         Possibly replaces plag in some places.                                                                                                                                                                                                                    In veins as needles in rosette-like aggregates.                                                                                                                                                                                                                                                                                                                                                                                                                                                                     In the center of a chlorite vein and of a chlorite-prehnite vein.                                                                                                                                                                                         Ti-mag replaced by maghemite(?). Secondary and primary magnetite alter to sphene. Scarce pyrite and chalcopyrite.                                                                                                                                         In one vein. Relief higher than quartz and yellow birefringence. Probably laumontite.                                                                                                                                                                     Large crystals of magnetite associated with veins are secondary. Sulfides are enlarged within veins. Veins 1-2 mm wide, with minerals (quartz and zeolite) and green external halos of predominately chlorite. Zeolite is associated with actinolite needles. Veins 3 1 mm wide, filled with chlorite + actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     N
G111 0504B159R01047049008 0184 DIV Sparsely plagioclase clinopyroxene phyric basalt                                Intergranular, subophitic, porphyritic                                                              Contact between unit 183 and unit 184   Medium with fine-grained patches.                                                Plagioclase         Clinopyroxene                                                                   1    < 1                 1    < 1                 0.6        0.5                                                                                                                                                                                                                                                                                                   Euhedral                                          Euhedral                                                                                                                                                                                                Zoned on margins. Also strained/undulose extinction.                                                                                                                                                                                                      Contains stubby plag crystals. Very small amounts of alteration to actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Plagioclase         Clinopyroxene       Olivine             Magnetite                               45   20   0    3         50   40   5    3         < 0.3      < 0.15     < 0.2       < 0.1                An 60                                                                                                                                                                                                                                                     Bladed                                            Subhedral-anhedral                                Anhedral                                          Subhedral                                                                                           Palmate texture in places. Monor alteration to clays +/- chlorite.                                                                                                                                                                                        Heavily altered to actinolite +/- chlorite.                                                                                                                                                                                                               Altered to chlorite + magnetite + actinolite +/- pyrite.                                                                                                                                                                                                  Minor alteration to maghemite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Pyrite                                                                                              1-2  8    20   < 1                      Plag, ol                                Ol                                      Cpx                                     Ol (?)                                                                                                                                                                                                  Severely altered plag. Minor replacement of ol.                                                                                                                                                                                                           Replaces groundmass ol.                                                                                                                                                                                                                                   Generally replaces up to 50% groundmass cpx. Partial replacement of ol.                                                                                                                                                                                   Associated with chlorite replacing groundmass ol.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 See thin section description 111-504B-158R-1 (Piece 4, 32-34 cm) for contact summary. Groundmass has patchy appearance with some 1 mm sized areas of fine-grained cpx and plag. Generally very altered +/- altered ol (now chlorite). These patches surround phenocrysts in places. Patches appear essentially 100% recrystallized.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     N
G111 0504B159R01047049008 0183 DIV Aphyric basalt                                                                  Subophitic, diabasic                                                                                Contact of Unit 183 with Unit 184       Fine                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 Plagioclase         Clinopyroxene       Magnetite                                                   55   30   4              55   41   4              < 0.5      < 0.3      < 0.1                            An 56                                                                                                                                                                                                                                                     Bladed                                            Anhedral                                          Subhedral                                                                                                                                             Palmate texture in some places.                                                                                                                                                                                                                           Rarely in sheaf-like bundles. Replaced by actinolite.                                                                                                                                                                                                     Very minor alteration to maghemite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Pyrite                                                                                              < 1  < 1  10   < 1                      Plag                                    Ol(?)                                   Cpx                                                                                                                                                                                                                                             Minor replacement of plag.                                                                                                                                                                                                                                Minor replacement of ferromags (ol?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 No obviously intrusive contact. Texture varies from medium-grained porphyritic to fine-grained aphyric but is not a simple gradation. Some of the finer-grained material forms "matrix" to "clots" of medium-grained material along supposed contact. However, mineralogy suggests that fine-grained material could be chilled facies of same dyke unit. Two units described separately because of textural differences.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                N
G111 0504B161R01004006001 0187 DIV Sparsely plagioclase olivine phyric basalt                                      Intergranular, subophitic                                                                           Unit 187                                Medium                                                                           Olivine             Plagioclase                                                                     0    1                   < 1  1                   < 2        < 2.5                                                                                         An 65                                                                                                                                                                                                   Subhedral                                         Euhedral                                                                                                                                                                                                Replaced by chlorite and actinolite.                                                                                                                                                                                                                      Polysynthetic twining, marginal zoning.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Plagioclase         Clinopyroxene       Olivine             Oxides                                  48   20   0    3         50   40   5    3         < 0.6      < 0.5      < 0.5      < 0.2                 An 60                                                                                                                                                 Iron/titanium                                                                                       Euhedral                                          Anhedral                                          Subhedral                                         Euhedral                                                                                            Bladed crystals.                                                                                                                                                                                                                                          Subophitic, chadacrysts of plag.                                                                                                                                                                                                                          Altered to chlorite + actinolite + oxides.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Vugs                       1              1.5                              Dispersed                                                   Chlorite, actinolite                                                                                                    Irregular                                                                                                               Possible vugs in matrix. Difficult to distinguish from irregular ol pseudomorphs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Clays               Chlorite            Actinolite          Oxides              Sulfides                                                                        2    4    20   < 1  < 1                 Plag                                    Ol                                      Cpx, ol                                 Ol                                      Ol, groundmass                                                                                                                                                  Replaces groundmass plag.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Replaces groundmass crystals and phenocrysts of olivine. Also replaces cpx.                                                                                                                                                                               Associated with groundmass oxides + ol alteration.                                                                                                                                                                                                        Associated with groundmass and phenocryst alteration of ol.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     N
G111 0504B163R01043045008 0187 DIV Sparsely plagioclase clinopyroxene olivine phyric basalt                        Intergranular, subophitic                                                                           Unit 187                                Medium                                                                           Olivine             Plagioclase         Clinopyroxene                                               0    1    < 1            < 1  1    < 1            1          1.5        1                                                                                  An 54                                                                                                                                                                                                   Anhedral                                          Euhedral                                          Subhedral                                                                                                                                             Completely altered to actinolite + Fe oxides.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Plagioclase         Clinopyroxene       Olivine             Oxides                                  50   30   0    3         55   40   2    3         </= 1      </= 1      </= 0.5    </= 0.2                                                                                                                                                                     Iron/titanium                                                                                       Euhedral                                          Anhedral                                          Anhedral                                          Subhedral                                                                                           Average grain size = 0.6 mm.                                                                                                                                                                                                                              Average grain size = 0.5 mm.                                                                                                                                                                                                                              Replaced by actinolite.                                                                                                                                                                                                                                   Average grain size generally < 0.2 mm.                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Oxides                                                                                              5    1    10   1                        Plag                                    Plag, ol                                Cpx, ol                                 Ol, matrix                                                                                                                                                                                              Replacing plag along cleavage traces and fractures.                                                                                                                                                                                                       Replacing plag along fractures. Minor replacement of ol.                                                                                                                                                                                                  Replacing ol phenocrysts, matrix and groundmass cpx.                                                                                                                                                                                                      Subhedral, dusty crystals. Replaces ol + matrix grains.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Moderately altered rock. No real phenocrysts, but plag +/- cpx glomerocrysts are slightly larger than average matrix grain. Plag glomerocrysts seem to grow side-by-side, with their long axes parallel. Plag extinction is undulose; some zoning on margins of more equant crystals. Some larger cpx crystals are oikocrysts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          N
G111 0504B163R01124126001 0187 DIV Amphibolitized metabasalt (aphyric)                                             Subophitic, poikilitic                                                                              Unit 187, near a brecciated zone        Medium                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Titanomagnetite                                             0    2    5              40   50   10             ?          ?          ?                                                                                                                                                                                                                                                                                          ?                                                 ?                                                 Subhedral, skeletal                                                                                                                                   May be some relics.                                                                                                                                                                                                                                       Relics.                                                                                                                                                                                                                                                   Altered.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Zeolites            Albite              Actinolite          Sphene              Hornblende                                                                      2    13   76   2    Tr?                 Plag                                    Plag                                    Cpx, veins                              Ti-mag                                                                                                                                                                                                  Laumontite(?) replacing plag and part of matrix.                                                                                                                                                                                                                                                                                                                                                                                                                                                                    Acicular to prismatic. Replaces plag and cpx.                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Possibly prismatic crystals of actinolite/hornblende.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   Acicular to prismatic actinolite crystals replace cpx. Sheaves of needles also occur in altered plag. Sub-parallel needles and aggregates form veins. This rock is completely altered, predominately to actinolite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     N
G111 0504B163R02017018003A0188 DIV Aphyric diabase basalt                                                          Intergranular, subophitic diabase                                                                   Unit 188                                Medium                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Olivine             Oxides                                  48   25   0    4         50   40   6    4         < 1.5      < 1        < 1        < 0.2                                                                                                                                                                       Iron/titanium                                                                                       Euhedral-subhedral                                Anhedral                                          Anhedral                                          Euhedral                                                                                            Some alteration to clays.                                                                                                                                                                                                                                 Altered to chlorite + actinolite.                                                                                                                                                                                                                         Altered to chlorite + actinolite.                                                                                                                                                                                                                         Minor alteration to sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Pyrite              Sphene              Oxides                                                      4    6    11   Tr   Tr   2              Plag, ol                                Ol, plag, cpx                           Cpx, ol                                 Ol                                      Oxides                                  Ol                                                                                                                      Minor replacement of ol.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Predominately replaces cpx.                                                                                                                                                                                                                               Associated with ol alteration.                                                                                                                                                                                                                            Associated with oxide alteration.                                                                                                                                                                                                                         Magnetite. Replacement of groundmass ol.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      This rock is a coarse diabase. Essentially aphyric with one or two large (up to 1.5 mm) cpx and plag crystals. Grain size of matrix approaches the size of these larger crystals. Some of these slightly coarser patches may indicate glomerocrysts, intratelluric growth, although there is no clear evidence to support this. Considered aphyric.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     N
G111 0504B164R01007009001 0188 DIV Moderately plagioclase clinopyroxene olivine phyric basalt                      Glomerophyric, subophitic                                                                           Unit 188                                Fine to medium                                                                   Olivine             Plagioclase         Clinopyroxene                                               0    5    1              < 1  5    1              1          0.5-2.0    1                                                                                                                                                                                                                                                                                          Subhedral                                         Euhedral                                          Subhedral                                                                                                                                             Altered to chlorite, opaques, minor actinolite.                                                                                                                                                                                                           Tabular, zoned. Altered to chlorite.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     Plagioclase         Clinopyroxene       Titanomagnetite                                             30   30   4              30   54   10             0.30       0.30       0.15                                                                                                                                                                                                                                                                                       Laths, euhedral                                   Anhedral                                          Subhedral,euhedral,                                                                                                                                   Fresh.                                                                                                                                                                                                                                                    Altered to actinolite.                                                                                                                                                                                                                                    Morphology continued: skeletal. COMMENTS:  Altered.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Albite              Actinolite          Pyrite              Chalcopyrite                                                                    6    3    21   Tr   Tr                  Plag, ol, matrix                        Plag                                    Plag                                                                                                                                                                                                                                            Alteration of plag along fractures.                                                                                                                                                                                                                       Replacement of some plag?                                                                                                                                                                                                                                 Greenish, acicular to prismatic crystals. Subhedral to anhedral.                                                                                                                                                                                          Scarce interstitial crystals.                                                                                                                                                                                                                             Subhedral to anhedral crystals in interstices.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Rock is slightly altered.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               N
G111 0504B165R01073076009 0189 DIV Moderately plagioclase clinopyroxene olivine phyric basalt                      Subophitic, intergranular                                                                           Unit 189                                Medium                                                                           Olivine             Plagioclase         Clinopyroxene                                               0    3    1              1    3    1              < 1.5      < 2        < 2                                                                                An 54 - An 30                                                                                                                                                                                           Subhedral                                         Euhedral-subhedral                                Subhedral                                                                                                                                             Replaced by chlorite + actinolite + oxides.                                                                                                                                                                                                               Very often a glomerocrysts. Fractured.                                                                                                                                                                                                                    Marginal plag inclusions. Fractured.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Plagioclase         Clinopyroxene       Olivine             Oxides                                  40   30   0    3         46   40   5    4         0.8        0.2        0.8        0.1                   An 40 - An 30                                                                                                                                         Iron/titanium                                                                                       ?                                                 ?                                                 ?                                                 ?                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Chlorite            Actinolite          Sphene              Oxides                                                                          6    4    12   < 1  < 1                 Ol                                      Ol                                      Ol, cpx                                 Oxides                                  Ol, oxides                                                                                                                                                      Replaces plag especially along fractures.                                                                                                                                                                                                                 Chlorite + actinolite form pseudomorphs after ol.                                                                                                                                                                                                         Partial replacement of Ol.                                                                                                                                                                                                                                Marginal replacement of iron/titanium oxides.                                                                                                                                                                                                             Associated with altered ol.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             Groundmass in variable in grain size, with patches (2-3 mm) of finer grained crystals. These patches often show palmate texture. Plag glomerocrysts show zoning and undulose extinction in places.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      N
G111 0504B166R01000003001 0190 DIV Sparsely plagioclase clinopyroxene phyric basalt                                Glomerophyric, microlitic                                                                           Unit 190, near a brecciated area        Very fine to fine                                                                Plagioclase         Clinopyroxene                                                                   </= 5< 1                 </= 5< 1                 0.1-0.6    0.1-0.5                                                                                                                                                                                                                                                                                               Tabular, euhedral                                 Euhedral                                                                                                                                                                                                Not homogeneously distributed.                                                                                                                                                                                                                            Altered in the pale halos.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Plagioclase         Clinopyroxene       Titanomagnetite                                             10   5    3              12   5    5              0.30-0.75  0.30       0.03                                                                                                                                                                                                                                                                                       Laths, euhedral                                   Skeletal, euhedral                                Anhedral                                                                                                                                              Fresh. Needles and laths.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Dusty. Altered to sphene                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Chlorite            Albite              Actinolite          Sphene              Pyrite              Magnetite                                                   4    2    10   2    Tr   Tr             Veins                                   Plag, mesostasis                        Cpx, veins, mesostasis                  Magnetite                                                                       Veins                                                                                                                   Localized in a corner and enriched in opaques.                                                                                                                                                                                                            Probably replacing plag.                                                                                                                                                                                                                                  In monomineralic veins or replacing groundmass ol.                                                                                                                                                                                                        Replacing matrix titanomagnetite. Also borders actinolite veins.                                                                                                                                                                                          Anhedral. Rare.                                                                                                                                                                                                                                           Secondary magnetite occurs in chlorite vein.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  One open fracture was probably filled with chlorite which was mechanically removed in thin section manufacture. Some chlorite + sphene remaining on the borders and in the halo. The chlorite vein contains about 30% magnetite. Groundmass is altered in 1-5 mm halos around veins.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    N
G111 0504B169R01066068014 0191 DIV Moderately plagioclase clinopyroxene olivine phyric basalt                      Massive, subophitic                                                                                 Unit 191                                Medium                                                                           Olivine             Plagioclase         Clinopyroxene                                               0    3    1              < 1  3    1              1.5        0.5-2.0    0.5-4.0                                                                                                                                                                                                                                                                                    Anhedral-subhedral                                Euhedral                                          Subhedral                                                                                                                                             Replaced by actinolite, pyrite.                                                                                                                                                                                                                           Glomerocrysts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Olivine             Plagioclase         Clinopyroxene       Magnetite                               0    35   20   5         10   40   40   6         < 0.5      < 0.5      < 0.5      < 0.5                                                                                                                                                                                                                                                                           Anhedral                                          Subhedral                                         Anhedral                                          Anhedral                                                                                            Replaced by actinolite.                                                                                                                                                                                                                                   Replaced by chlorite, actinolite, zeolite.                                                                                                                                                                                                                Replaced by actinolite.                                                                                                                                                                                                                                   Replaced by sphene.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Zeolites            Chlorite            Actinolite          Sphene              Pyrite                                                      1    2    2    28   2    1              Ol                                      Plag                                    Plag                                    Ol, plag, cpx                           Magnetite                               Ol                                                                                                                      Replaces groundmass olivine.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            N
G111 0504B170R01050051011 0192 DIV Basaltic breccia                                                                Hypohaline, glomerophyric                                                                           Boot basket chip                        Very fine to fine                                                                Olivine             Plagioclase         Clinopyroxene                                               0    2    2              < 1  5    2              1          1.0-2.0    < 1                                                                                                                                                                                                                                                                                        ?                                                 Euhedral, tabular                                 Subhedral                                                                                                                                             Completely altered to mixed-layer clays.                                                                                                                                                                                                                  Glomerocrysts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           Plagioclase         Clinopyroxene                                                                   9    10                  52   40                  0.1-0.5    0.1                                                                                                                                                                                                                                                                                                   ?                                                 ?                                                                                                                                                                                                       Altered to mixed-layer clays.                                                                                                                                                                                                                             Altered to mixed-layer clays.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            Vesicles                   0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Clays               Clays               Zeolites            Chlorite            Quartz              Anhydrite           Chalcopyrite        Pyrite              30   32   3    10   2    Tr   Tr   Tr   Veins, cpx                              Veins, ol, plag                         Plag, veins                             Ol, plag, veins                         Veins                                                                           Veins                                                                           Mixed-layer clays replace matrix. Some vermicular clay also.                                                                                                                                                                                              Mixed-layer clays after ol.                                                                                                                                                                                                                               In veins as radiating fibers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       In veins bordered by chlorite. Subhexagonal.                                                                                                                                                                                                              Anhedral. In breccia cement.                                                                                                                                                                                                                              In quartz veins. Pseudohexagonal to anhedral.                                                                                                                                                                                                             In altered matrix. Subhedral to anhedral.                                                                                                                                                                                                                 Actual Id for this thin section is 111-504B-Boot basket chip, the information given above is ficticous.  MAIN COMMENTS:  Quartz is subhedral to euhedral (basal hexagonal sections). Chalcopyrite (negative, euhedral crystals) grows in quartz interstices. Pyrite replaces plag and contains numerous mesostasis inclusions. in one veins, vermicular mineral (clay?).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                N