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Core Data from the Deep Sea Drilling Project


Leg : 64    Top/Bottom Interval(mm):  480/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   222.00   Rock Type: IGNEOUS
Core:  26   Sample Midpoint(m)     :   222.48   Sect/Pc #:  1/PCE 6

ROCK = APHYRIC BASALT;
       Texture: APHYRIC,INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Groundmass - PLAGIOCLASE               (   60%)
             Size(mm):        1.5  Morphology: LATH-SHAPED
             UP TO 1.5 MM LONG,APPROX COMP AN62-68,NORMALLY
             ZONED,INTERSTITIAL;

             CLINOPYROXENE             (   25%)
             Size(mm):    0.1-0.5  Morphology: ANHEDRAL
             APPROX COMP AUGITE?,VERY PALE BROWN,INTERGRANULAR;

             MAGNETITE                 (    3%)
             Size(mm):    0.1-0.3  Morphology: CUBOID
             ESPECIALLY IN ALTERATION AREAS;

             ILMENITE                  (    3%)
             Size(mm):     TO 0.5  Morphology: ELONGATE,TRELLIS PATTERN,

             Morphology: SKELETAL
             ESPECIALLY IN ALTERATION AREAS*

Alteration - CLAY MINERALS             (   10%)
             Location: INTERSTITIAL   Replacing: MESOSTASIS,OL
             INTERSTITIAL AND AS ANHEDRAL PSEUDOMORPHS,
             REPLACING MESOSTASIS? AND POSSIBLY OL,GREEN CLAY?*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  450/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   231.50   Rock Type: IGNEOUS
Core:  27   Sample Midpoint(m)     :   231.95   Sect/Pc #:  1/PCE 4A

ROCK = APHYRIC BASALT
       ALTERED;
       Texture: APHYRIC,INTERSERTAL,VESICULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Groundmass - PLAGIOCLASE               (   40%)
             Size(mm):    0.2-0.8  Morphology: LATHS,SKELETAL
             SKELETAL MICROLITES,INTERSTITIAL;

             CLINOPYROXENE             (   10%)
             Size(mm):       <0.1  Morphology: ANHEDRAL
             SOME MAY BE OL (TOO SMALL TO BE SURE);

             MAGNETITE                 (    3%)
             Size(mm):   0.01-0.1  Morphology: CUBOID,EUHEDRAL

             ILMENITE                  (    3%)
             Size(mm):     TO 0.1  Morphology: ELONGATE,TRELLIS

Alteration - CLAY MINERALS             (   40%)
             Location: THROUGHOUT     Replacing: MESOSTASIS,OL
             REPLACING MESOSTASIS? AND POSSIBLY OL*

Vesicles   -
             Size(mm):    1-1.5
             Percent:    <3
             Location: RANDOM
             Shape: SPHERICAL
             FILLING IS NOT-PRESERVED*




Leg : 64    Top/Bottom Interval(mm):  820/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   231.50   Rock Type: IGNEOUS
Core:  27   Sample Midpoint(m)     :   232.32   Sect/Pc #:  1/PCE 7

ROCK = APHYRIC BASALT;
       Texture: APHYRIC,INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Groundmass - PLAGIOCLASE               (   50%)
             Size(mm):       <0.5  Morphology: LATH-SHAPED
             INTERSTITIAL,APPROX AN50?;

             CLINOPYROXENE             (   10%)
             Size(mm):       <0.1  Morphology: ANHEDRAL
             INTERGRANULAR,SOME MAY BE OL (TOO SMALL TO SEE);

             OPAQUE MINERALS           (    5%)
             Size(mm):       <0.2  Morphology: SUBHEDRAL-EUHEDRAL
             INCLUDES MAGN + ILMENITE*

Alteration - CARBONATE                 (    1%)
             Location: VESICLES
             PERCENTAGE QUESTIONABLE,POSSIBLY MORE IN
             GROUNDMASS;

             CLAY MINERALS             (   35%)
             Location: INTERSTITIAL   Replacing: MESOSTASIS,OL
             REPLACING OL IS QUESTIONABLE,IRON-RICH,GREEN IN
             COLOR*

Vesicles   -
             Size(mm):    TO 10
             Percent:     3
             Location: RANDOM
             Filling: MESOSTASIS,
             Shape: OVOID

             Filling: VESICLES,PLAG
             "COMPOUND" VESICLES (TO 10 MM) WITH SMALLER (0.5-
             1.0 MM) EMPTY VESICLES INSIDE,FILLING CONSISTS OF
             COARSE-GRAINED IRON-RICH MESOSTASIS + PLAG +
             VESICLES;

             Size(mm):      0.3
             Percent:    <1
             Location: RANDOM
             Filling: CLAY.MIN,
             Shape: SPHERICAL

             Filling: CALCITE
             "ORDINARY" VESICLES*




Leg : 64    Top/Bottom Interval(mm):  500/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   336.00   Rock Type: IGNEOUS
Core:  40   Sample Midpoint(m)     :   339.50   Sect/Pc #:  3/PCE 1B

ROCK = PLAG SPARSELY PHYRIC DOLERITE;
       Texture: SPARSELY PORPHYRITIC,SUBOPHITIC-INTERGRANULAR;
       OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE               (  1-2%)
             Size(mm):          2  Morphology: EQUANT-TABULAR
             ZONED,RARE;

             CLINOPYROXENE
             LARGE PYX'S MAY BE PHENOS OR GROUNDMASS PHASES*

Groundmass - OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   40%)
             Size(mm):    0.5-1.5  Morphology: LATH-SHAPED
             PLAG OCCURS AS OPHITIC INCLUSIONS IN PYX AND AS
             XTLS BETWEEN PYX XTLS;

             CLINOPYROXENE             (   35%)
             Size(mm):       TO 4  Morphology: ANHEDRAL
             APPROX COMP AUGITE? (PALE BROWN),TWO TYPES PRESENT
             1)LARGE (PHENOS?) IRREGULAR XTLS ENCLOSING PLAG
             AND 2)SMALLER INTERGRANULAR XTLS;

             OPAQUE MINERALS           (    5%)
             Size(mm):        0.2  Morphology: CUBOID,ELONGATE
             INCLUDES MAGN + ILMENITE,MAGN IS CUBOID AND
             ILMENITE IS ELONGATE*

Alteration - COMBINATION               (   15%)
             Location: INTERSTICES    Replacing: MESOSTASIS,OL,FEL
             INCLUDES CLAY.MIN + ZEOLITES,REPLACES MESOSTASIS?
             AND POSSIBLY OL?,MINOR ALTERATION OF FELDSPARS*

Vesicles   -
             Size(mm):        1
             Percent:     3
             Location: INTERGRANULAR
             Filling: CLAY.MIN,
             Shape: SPHERICAL

             Filling: ZEOLITES
             ZEOLITE FILLING IS QUESTIONABLE,CLAY IS GREEN*




Leg : 64    Top/Bottom Interval(mm):  820/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   345.50   Rock Type: IGNEOUS
Core:  41   Sample Midpoint(m)     :   346.32   Sect/Pc #:  1/PCE 3

ROCK = DOLERITE;
       Texture: APHYRIC,SUBOPHITIC-INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR,ZONE OF APPARENT FELDSPAR
       ACCUMULATION*

Phenocrysts- CLINOPYROXENE
             SOME CPX MAY BE PHENOS*

Groundmass - OLIVINE                   (   <5%)
             Size(mm):    0.3-0.8  Morphology: ANHEDRAL

             PLAGIOCLASE               (   30%)
             Size(mm):       TO 2  Morphology: ELONGATE,LATH-SHAPED
             ABOUT ONE-FOURTH ARE ENCLOSED IN CPX XTLS,STRONGLY
             ZONED;

             CLINOPYROXENE             (   25%)
             Size(mm):       TO 3  Morphology: IRREGULAR,AGGREGATES
             APPROX COMP AUGITE,OPTICALLY CONTINUOUS AGGREGATES
             AND IRREGULAR XTLS;

             OPAQUE MINERAL            (    3%)
             Size(mm):       <0.3  Morphology: IRREGULAR,ANHEDRAL
             INCLUDES MAGN + ILMENITE;

             PYRITES                   (    2%)
             Morphology: AGGREGATES
             IDENTITY UNCERTAIN,AGGREGATES IN VEINS*

Alteration - COMBINATION               (   35%)
             Location: INTERSTICES    Replacing: MESOSTASIS,OL,CPX,PLAG
             INCLUDES GREEN FIBROUS CLAY.MIN AND ZEOLITES?,
             REPLACING MESOSTASIS? (A LOT OF WHICH APPEARS TO
             HAVE BEEN LOST IN THIN SECTION PREPARATION) + OL +
             SOME CPX + SOME PLAG*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  800/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   345.50   Rock Type: IGNEOUS
Core:  41   Sample Midpoint(m)     :   350.80   Sect/Pc #:  4/PCE 1D

ROCK = DOLERITE;
       Texture: APHYRIC,OPHITIC,INTERGRANULAR
       OPHITIC (PLAG IN PYX) WITH ALTERED INTERGRANULAR
       ZONES;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- CLINOPYROXENE
             LARGE ANHEDRAL PYX XTLS MAY BE PHENOS*

Groundmass - OLIVINE                   (   <5%)
             Size(mm):        0.5  Morphology: ANHEDRAL

             PLAGIOCLASE               (   30%)
             Size(mm):      0.5-3  Morphology: LATH-SHAPED
             APPROX COMP AN54 (1 DETERMINED BY THE MICHAEL-LEVY
             METHOD),OPHITICALLY ENCLOSED BY CPX AND
             INTERSTITIAL TO CPX;

             CLINOPYROXENE             (   40%)
             Size(mm):        1-4  Morphology: ANHEDRAL
             APPROX COMP AUGITE?,LARGE XTLS AND SMALLER MORE
             INTERSTITIAL GRAINS;

             OPAQUE MINERALS           (    5%)
             Size(mm):    0.2-0.4  Morphology: ANHEDRAL,ELONGATE
             INCLUDE MAGN + ILMENITE,DISSEMINATED,SOME ELONGATE
             GRAINS OF ILMENITE*

Alteration - COMBINATION               (   20%)
             Location: INTERSTITIAL   Replacing: MESOSTASIS,PYX,OL,PLAG
             INCLUDES GREEN CLAY.MIN + ZEOLITES,INTERSTITIAL TO
             LARGE PYX XTLS,REPLACING MESOSTASIS + RIMMING PYX
             + RIMMING OL + SLIGHT ALTERATION OF INTERGRANULAR
             PLAG*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  600/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   345.50   Rock Type: IGNEOUS
Core:  41   Sample Midpoint(m)     :   353.60   Sect/Pc #:  6/PCE 1E

ROCK = DOLERITE;
       Texture: APHYRIC,SUBOPHITIC,GLOMEROPORPHYRITIC
       GLOMEROPORPHYRITIC IS QUESTIONABLE,THE TEXTURE IN
       THIS ROCK IS UNUSUAL. THE PYX AND PLAG XTLS ARE
       INTERGROWN TO FORM SUBOPHITIC AND GLOMEROPHYRIC
       MASSES (APPROX 3-5 MM ACROSS) ENCLOSED IN A VERY
       FINE GRAINED AND VERY ALTERED MESOSTASIS OR
       QUENCHED BASALT. THIS SUGGESTS THAT CPX + OL +
       PLAG ARE MAINLY PHENOS;
       Where sampled: OTHER
       SILL INTERIOR*

Groundmass - OLIVINE                   (    3%)
             Size(mm):    0.5-1.0  Morphology: ANHEDRAL
             ADJACENT TO OR ENCLOSED BY CPX;

             PLAGIOCLASE               (   20%)
             Size(mm):       TO 3  Morphology: LATH-SHAPED
             INTERGROWN WITH CPX AND INTERGRANULAR TO CPX;

             CLINOPYROXENE             (   20%)
             Size(mm):       TO 4
             APPROX COMP AUGITE,LARGE SEMI-CONTINUOUS XTLS;

             MAGNETITE                 (    3%)
             Size(mm):     TO 1.0  Morphology: SKELETAL,CUBOID
             APPROX COMP TITANOMAGNETITE*

Alteration - COMBINATION               (   50%)
             Location: INTERSTITIAL   Replacing: MESOSTASIS
             INCLUDES CLAY.MIN + ZEOLITES,INTERSTITIAL TO PYX
             + PLAG GLOMEROCRYSTS,PROBABLY REPLACING A FINE
             GRAINED BASALT OR A MESOSTASIS,MOSTLY LOST DURING
             THIN SECTION PREPARATION*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  850/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   355.00   Rock Type: IGNEOUS
Core:  42   Sample Midpoint(m)     :   357.35   Sect/Pc #:  2/PCE 1F

ROCK = DOLERITE;
       Texture: PORPHYRITIC,OPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   20%)
             Size(mm):          1  Morphology: LATHS
             APPROX COMP AN40,OPHITICALLY ENCLOSED IN CPX;

             CLINOPYROXENE             (   20%)
             Size(mm):        1-4  Morphology: ANHEDRAL-SUBHEDRAL
             APPROX COMP AUGITE,IRREGULARLY FRACTURED*

Groundmass - OLIVINE                   (    0%)

             PLAGIOCLASE               (   25%)
             Size(mm):         <1  Morphology: LATHS
             SMALL LATHS;

             CLINOPYROXENE             (    5%)
             Size(mm):         <1  Morphology: ANHEDRAL
             APPROX COMP AUGITE;

             OPAQUE MINERALS           (   10%)
             INCLUDES MAGN + ILMENITE*

Alteration - CARBONATE                 (    0%)

             COMBINATION               (   20%)
             Replacing: PLAG
             INCLUDES CLAY.MIN + ZEOLITES,FOUND IN AREAS OF
             APHANITIC TEXTURE (QUENCHED?),REPLACING PLAG
             MICROLITES*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm): 1160/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   355.00   Rock Type: IGNEOUS
Core:  42   Sample Midpoint(m)     :   357.66   Sect/Pc #:  2/PCE 1G

ROCK = GABBRO;
       Texture: GABBROIC (CUMULATE),OPHITIC,GRAPHIC,INTERSERTAL
       THE TEXTURE OF THIS ROCK IS UNUSUAL BUT SIMILAR TO
       41-6-60. HOWEVER THE INTERSTITIAL MESOSTASIS IS
       BETTER PRESERVED AND SEVERAL OF THE FRAGMENTS ARE
       GABBROIC. ONE FRAGMENT (APPROX 12 MM LONG)
       COMPRISES CUMULATE PLAG WHILE ANOTHER SHOWS A
       GRAPHIC INTERGROWTH OF PLAG IN PYX;
       Where sampled: OTHER
       SILL INTERIOR,GABBROIC INCLUSION AND ALTERED ZONE*

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.5-1.0  Morphology: ANHEDRAL
             ASSOCIATED WITH CPX/PLAG CLUSTERS;

             PLAGIOCLASE               (   30%)
             Size(mm):       TO 5  Morphology: LATH-SHAPED,EQUANT,AGGREGATES
             OCCURS IN AGGREGATES WITH CPX,SUBOPHITIC AND
             GRAPHIC INTERGROWTHS WITH CPX,ONE CLUSTER OF PLAG
             IS DEFINITELY PART OF A CUMULATE GABBRO WHICH
             CONTAINS OL,APPROX COMP AN50-70;

             CLINOPYROXENE             (   40%)
             Size(mm):        1-6  Morphology: IRREGULAR
             IRREGULAR XTLS AND INTERSTITIAL TO PLAG,APPROX
             COMP AUGITE;

             MAGNETITE                 (    3%)
             Size(mm):       <0.5

             MICROCRYST GROUNDMASS     (   10%)
             INCLUDES PLAG + CPX + FE.MINS + MESOSTASIS,VERY
             FINE GRAINED MESOSTASIS COMPRISING PLAG MICROLITES
             + IRON ORE + POSSIBLY CPX (NOW COMPLETELY
             ALTERED),SURROUNDS GABBROIC-DOLERITIC FRAGMENTS*

Alteration - CLAY MINERALS             (   10%)
             Location: INTERSTICES    Replacing: MESOSTASIS
             MAINLY IN THE INTERSTICES REPLACING MESOSTASIS;

             ZEOLITE                   (   15%)
             Location: INTERSTICES    Replacing: MESOSTASIS,FEL
             MAINLY IN THE INTERSTICES REPLACING MESOSTASIS,THE
             ZEOLITES FORM RADIATING CLUSTERS IN 1-2 MM
             CAVITIES*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  930/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   355.00   Rock Type: IGNEOUS
Core:  42   Sample Midpoint(m)     :   358.93   Sect/Pc #:  3/PCE 3B

ROCK = DOLERITE
       VERY ALTERED;
       Texture: SUBOPHITIC,INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR,CLOSE TO VEIN*

Phenocrysts- PLAGIOCLASE
             LARGE (UP TO 5 MM) CPX AND PLAG INTERGROWTHS MAY
             BE PHENOCRYSTIC BUT ARE LISTED IN THE GROUNDMASS;

             CLINOPYROXENE
             LARGE (UP TO 5 MM) CPX AND PLAG INTERGROWTHS MAY
             BE PHENOCRYSTIC BUT ARE LISTED IN THE GROUNDMASS*

Groundmass - OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   40%)
             Size(mm):    0.5-2.5  Morphology: LATH-SHAPED
             APPROX COMP AN60-65;

             CLINOPYROXENE             (   20%)
             Size(mm):       TO 4  Morphology: IRREGULAR
             APPROX COMP AUGITE,IRREGULAR ISOLATED XTLS
             SUBOPHITICALLY ENCLOSING PLAG LATHS,ALSO
             INTERGRANULAR;

             MAGNETITE                 (    1%)
             Size(mm):     TO 0.5  Morphology: ANHEDRAL

             ILMENITE                  (    1%)
             Size(mm):     TO 0.5  Morphology: ELONGATE

Alteration - COMBINATION               (   35%)
             Location: INTERSTICES    Replacing: MESOSTASIS,OL
             INCLUDES CLAY.MIN + ZEOLITES,FOUND IN INTERSTICES
             BETWEEN LARGE CPX/PLAG INTERGROWTHS,REPLACING
             MESOSTASIS AND POSSIBLY OL*




Leg : 64    Top/Bottom Interval(mm):  990/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   364.50   Rock Type: IGNEOUS
Core:  43   Sample Midpoint(m)     :   365.49   Sect/Pc #:  1/PCE 1G

ROCK = DOLERITE TO GABBRO
       COARSE DOLERITE TO MICROGABBRO;
       Texture: PORPHYRITIC,OPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):     0.75-1  Morphology: ANHEDRAL-SUBHEDRAL

             PLAGIOCLASE               (   20%)
             Size(mm):   0.75-1.5  Morphology: LATHS
             APPROX COMP AN55,SOME ZONED NORMALLY;

             CLINOPYROXENE             (   15%)
             Size(mm):      1.5-3  Morphology: ANHEDRAL-SUBHEDRAL
             APPROX COMP AUGITE,FRACTURED,OPHITICALLY ENCLOSING
             PLAG*

Groundmass - OLIVINE                   (    0%)

             PLAGIOCLASE               (   30%)
             Size(mm):   0.3-0.75  Morphology: LATHS
             SMALL LATHS;

             CLINOPYROXENE             (    5%)
             Size(mm):      0.1-1  Morphology: ANHEDRAL
             APPROX COMP AUGITE;

             OPAQUE MINERALS           (   10%)
             INCLUDES MAGN + ILMENITE*

Alteration - COMBINATION               (   15%)
             Location: INTERGRAIN     Replacing: CPX
             Location: BOUNDARIES
             INCLUDES CLAY.MIN + ZEOLITES,FOUND IN INTERGRAIN
             BOUNDARIES AND AFTER CPX,BROWNISH GREEN COLOR*




Leg : 64    Top/Bottom Interval(mm):  700/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   364.50   Rock Type: IGNEOUS
Core:  43   Sample Midpoint(m)     :   366.70   Sect/Pc #:  2/PCE 1C

ROCK = DOLERITE
       ALTERED;
       Texture: PORPHYRITIC,SUBOPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    7%)
             Size(mm):      0.5-1  Morphology: ANHEDRAL
             CORRODED;

             PLAGIOCLASE               (   15%)
             Size(mm):        1-3  Morphology: TABULAR LATHS,FEATHERED EDGES
             STRONG ZONING;

             CLINOPYROXENE             (   10%)
             Size(mm):      0.5-1  Morphology: ANHEDRAL
             APPROX COMP AUGITE,FRACTURED ALONG CLEAVAGE AND
             CORRODED*

Groundmass - OLIVINE                   (   10%)
             Size(mm):    0.1-0.5

             PLAGIOCLASE               (   20%)
             Size(mm):      0.5-1

             CLINOPYROXENE             (   20%)
             Size(mm):    0.1-0.5

             MAGNETITE                 (    3%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL

Alteration - CARBONATE                 (    5%)
             Location: VEINLETS

             COMBINATION               (   10%)
             Location: INTERGRAIN     Replacing: GROUNDMASS,CPX,OL
             Location: BOUNDARIES
             INCLUDES CLAY.MIN + ZEOLITES,REPLACING OL IS
             QUESTIONABLE*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  680/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   364.50   Rock Type: IGNEOUS
Core:  43   Sample Midpoint(m)     :   369.68   Sect/Pc #:  4/PCE 2D

ROCK = DOLERITE;
       Texture: PORPHYRITIC,SUBOPHITIC
       WAS OPHITIC BEFORE BREAKAGE OF CPX?;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    0%)

             PLAGIOCLASE               (   15%)
             Size(mm):        1-2  Morphology: LATHS
             STRONG ZONING (SOME REVERSE);

             CLINOPYROXENE             (    0%)

Groundmass - OLIVINE                   (   10%)
             Size(mm):    0.1-0.5  Morphology: ANHEDRAL

             PLAGIOCLASE               (   25%)
             Size(mm):      0.1-1  Morphology: LATHS
             SMALL LATHS;

             CLINOPYROXENE             (   30%)
             Size(mm):    0.1-0.5  Morphology: ANHEDRAL,GRANULAR AGGREGATES
             APPROX COMP AUGITE,EXTENSIVELY FRACTURED;

             MAGNETITE                 (    5%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL
             DISSEMINATED*

Alteration - CARBONATE                 (    5%)
             Location: VEINLETS
             FILLING VEINLETS;

             COMBINATION               (   10%)
             Location: INTERGRAIN     Replacing: CPX,OL
             Location: BOUNDARIES
             INCLUDES CLAY.MIN + ZEOLITES*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  250/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   374.00   Rock Type: IGNEOUS
Core:  44   Sample Midpoint(m)     :   374.25   Sect/Pc #:  1/PCE 1C

ROCK = DOLERITE TO GABBRO
       MICROGABBRO TO COARSE DOLERITE;
       Texture: PORPHYRITIC,OPHITIC
       CPX ENCLOSING PLAG (AT TIMES SUBOPHITIC);
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   30%)
             Size(mm):      1-1.5  Morphology: TABULAR LATHS
             APPROX COMP AN40,OPHITICALLY ENCLOSED IN CPX +
             SOME SUBOPHITIC PLAG AROUND SMALLER CPX;

             CLINOPYROXENE             (   20%)
             Size(mm):        1-3  Morphology: SUBHEDRAL-ANHEDRAL
             APPROX COMP AUGITE,AT TIMES FRACTURED BUT VERY
             FRESH*

Groundmass - PLAGIOCLASE               (   15%)
             Size(mm):      0.1-1  Morphology: LATHS
             SMALL LATHS;

             CLINOPYROXENE             (   15%)
             Size(mm):      0.1-1  Morphology: ANHEDRAL
             APPROX COMP AUGITE;

             MAGNETITE                 (    5%)

Alteration - COMBINATION               (   20%)
             Location: INTERGRAIN     Replacing: CPX PHENOS,CPX
             Location: BOUNDARIES
             INCLUDES CLAY.MIN + ZEOLITES,REPLACING BOTH CPX
             PHENOS AND GROUNDMASS CPX*




Leg : 64    Top/Bottom Interval(mm):  580/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   374.00   Rock Type: IGNEOUS
Core:  44   Sample Midpoint(m)     :   382.08   Sect/Pc #:  6/PCE 1B

ROCK = DOLERITE
       ALTERED;
       Texture: PORPHYRITIC,OPHITIC-SUBOPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    0%)

             PLAGIOCLASE               (   20%)
             Size(mm):      1-1.5  Morphology: TABULAR LATHS
             APPROX COMP AN60,MOST SHOW NORMAL ZONING;

             CLINOPYROXENE             (   10%)
             Size(mm):        1-4  Morphology: SUBHEDRAL-ANHEDRAL
             APPROX COMP AUGITE*

Groundmass - OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   25%)
             Size(mm):    0.1-0.5

             CLINOPYROXENE             (   10%)
             Size(mm):    0.1-0.5

             OPAQUE MINERALS           (    5%)
             Size(mm):    0.1-0.3  Morphology: SUBHEDRAL-ANHEDRAL
             INCLUDES MAGN + ILMENITE*

Alteration - CLAY MINERALS             (   15%)
             Location: INTERGRAIN     Replacing: CPX
             Location: BOUNDARIES
             AFTER CPX;

             ZEOLITE                   (   15%)
             Location: INTERGRAIN
             Location: BOUNDARIES

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  160/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   383.00   Rock Type: IGNEOUS
Core:  45   Sample Midpoint(m)     :   389.16   Sect/Pc #:  5/PCE 1A

ROCK = CPX PHYRIC DOLERITE
       WEATHERED;
       Texture: PORPHYRITIC,POIKILITIC-OPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- CLINOPYROXENE             (   15%)
             Size(mm):      0.5-5  Morphology: ANHEDRAL
             APPROX COMP AUGITE*

Groundmass - PLAGIOCLASE               (   40%)
             Size(mm):    0.5-1.5  Morphology: LATHS
             APPROX COMP AN50,SMALL LATHS ENCLOSED PARTLY OR
             TOTALLY WITHIN LARGE CPX,ZONED;

             OPAQUE MINERALS           (    5%)
             Size(mm):    0.1-0.5
             INCLUDES MAGN + ILMENITE*

Alteration - CLAY MINERALS             (   25%)
             Location: INTERGRAIN     Replacing: CPX
             Location: BOUNDARIES
             BROWNISH GREEN;

             ZEOLITE                   (   15%)
             Location: INTERGRAIN
             Location: BOUNDARIES

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm): 1080/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   383.00   Rock Type: IGNEOUS
Core:  45   Sample Midpoint(m)     :   390.08   Sect/Pc #:  5/PCE 1F

ROCK = PLAG-CPX PHYRIC DOLERITE;
       Texture: PORPHYRITIC,OPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   20%)
             Size(mm):    0.5-1.5  Morphology: LATHS
             APPROX COMP AN45,WITHIN AND PROTRUDING FROM CPX;

             CLINOPYROXENE             (   15%)
             Size(mm):        1-5  Morphology: SUBHEDRAL-ANHEDRAL
             APPROX COMP AUGITE,CORRODED,APPEARS TO PARTIALLY
             ENCLOSE PLAG + OPHITICALLY ENCLOSE PLAG*

Groundmass - OLIVINE                   (    0%)

             PLAGIOCLASE               (   30%)
             Size(mm):       >0.5

             CLINOPYROXENE             (   10%)
             Size(mm):      0.5-1  Morphology: ANHEDRAL GRAINS
             APPROX COMP AUGITE,CORRODED AND ISOLATED FROM
             MOST PHENOS;

             OPAQUE MINERALS           (   <5%)
             Size(mm):        0.2  Morphology: ANHEDRAL
             INCLUDES MAGN + ILMENITE,DISSEMINATED*

Alteration - CLAY MINERALS             (   10%)
             Location: INTERGRAIN     Replacing: CPX PHENOS
             Location: BOUNDARIES

             ZEOLITE                   (   10%)
             Location: INTERGRAIN
             Location: BOUNDARIES

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  180/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   392.00   Rock Type: IGNEOUS
Core:  46   Sample Midpoint(m)     :   392.18   Sect/Pc #:  1/PCE 1D

ROCK = PLAG-CPX PHYRIC DOLERITE TO GABBRO
       COARSE DOLERITE TO MICROGABBRO;
       Texture: PORPHYRITIC,OPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   40%)
             Size(mm):      1-2.5  Morphology: TABULAR LATHS
             APPROX COMP AN44,SOME NORMAL ZONING;

             CLINOPYROXENE             (   20%)
             Size(mm):        2-5  Morphology: SUBHEDRAL
             APPROX COMP AUGITE,MOSTLY VERY FRESH*

Groundmass - PLAGIOCLASE               (   15%)
             Size(mm):      0.5-1  Morphology: LATHS
             SMALL LATHS;

             CLINOPYROXENE             (    5%)
             Size(mm):         <2  Morphology: ANHEDRAL
             APPROX COMP AUGITE,PROBABLY FRAGMENTS OF LARGER
             CPX;

             OPAQUE MINERALS           (    5%)
             Size(mm):  0.25-0.75  Morphology: EUHEDRAL-SUBHEDRAL
             INCLUDES MAGN + ILMENITE,LARGE EUHEDRAL-SUBHEDRAL,
             DISSEMINATED*

Alteration - CARBONATE                 (    0%)

             CLAY MINERALS             (   10%)
             Location: INTERGRAIN     Replacing: CPX
             Location: BOUNDARIES
             AFTER SOME CPX;

             ZEOLITE                   (    5%)
             Location: INTERGRAIN
             Location: BOUNDARIES

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  750/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   392.00   Rock Type: IGNEOUS
Core:  46   Sample Midpoint(m)     :   397.25   Sect/Pc #:  4/PCE 1C

ROCK = PLAG-CPX PHYRIC DOLERITE;
       Texture: PORPHYRITIC,OPHITIC,INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE               (   30%)
             Size(mm):    0.5-1.5  Morphology: TABULAR LATHS
             APPROX COMP AN50,MINOR NORMAL ZONING;

             CLINOPYROXENE             (   20%)
             Size(mm):      0.5-4  Morphology: ANHEDRAL
             APPROX COMP AUGITE,PHENOCRYST FRAGMENTS*

Groundmass - OLIVINE                   (    5%)
             Size(mm):       <0.5  Morphology: ANHEDRAL

             PLAGIOCLASE               (   30%)
             Size(mm):    0.1-0.5  Morphology: LATHS
             SMALL LATHS,INTERGRANULAR;

             OPAQUE MINERALS           (   <5%)
             Size(mm):   0.1-0.25  Morphology: SUBHEDRAL-ANHEDRAL
             INCLUDES MAGN + ILMENITE,DISPERSED*

Alteration - COMBINATION               (   10%)
             Location: INTERGRAIN     Replacing: CPX
             Location: BOUNDARIES
             INCLUDES CLAY.MIN + ZEOLITES*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  100/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   412.00   Rock Type: IGNEOUS
Core:  49   Sample Midpoint(m)     :   415.10   Sect/Pc #:  3/PCE 1B

ROCK = DOLERITE;
       Texture: SUBOPHITIC-OPHITIC,INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE
             LARGE CPX + PLAG INTERGROWTHS MAY BE PHENOS BUT
             THEY ARE LISTED IN THE GROUNDMASS FIGURES;

             CLINOPYROXENE
             LARGE CPX + PLAG INTERGROWTHS MAY BE PHENOS BUT
             THEY ARE LISTED IN THE GROUNDMASS FIGURES*

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.4-1.0  Morphology: ANHEDRAL
             SURROUNDED BY CLAY.MIN;

             PLAGIOCLASE               (   45%)
             Size(mm):    0.4-1.5  Morphology: LATH-SHAPED
             OCCURS IN PYX AND SEPARATELY;

             CLINOPYROXENE             (   45%)
             Size(mm):       TO 4  Morphology: IRREGULAR
             APPROX COMP AUGITE,LARGE OPHITICALLY CONTINUOUS
             AGGREGATES AND SMALLER INTERGRANULAR XTLS;

             OPAQUE MINERALS           (    2%)
             Size(mm):       TO 1  Morphology: SKELETAL
             INCLUDES MAGN + ILMENITE,SKELETAL AND FRAGMENTED*

Alteration - CLAY MINERALS             (    5%)
             Location: INTERSTITIAL   Replacing: MESOSTASIS,OL,MICAS
             REPLACING MESOSTASIS AND MICAS IS QUESTIONABLE*




Leg : 64    Top/Bottom Interval(mm):  550/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   419.00   Rock Type: IGNEOUS
Core:  50   Sample Midpoint(m)     :   425.55   Sect/Pc #:  5/PCE 1D

ROCK = DOLERITE;
       Texture: OPHITIC-POIKILITIC,INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.3-1.0  Morphology: ANHEDRAL
             SOME ENCLOSED IN CPX;

             PLAGIOCLASE               (   50%)
             Size(mm):    0.3-2.0  Morphology: LATH-SHAPED,TABULAR
             APPROX COMP AN55-60;

             CLINOPYROXENE             (   40%)
             Size(mm):    0.3-5.0  Morphology: ANHEDRAL
             LARGE ANHEDRAL XTLS ENCLOSING PLAG + RARE OL AND
             ALSO SMALLER INTERGRANULAR XTLS;

             OPAQUE MINERALS           (    1%)
             Size(mm):    0.1-0.3  Morphology: IRREGULAR
             INCLUDES MAGN + ILMENITE*

Alteration - CLAY MINERALS             (    5%)
             Location: INTERSTITIAL   Replacing: MESOSTASIS,OL




Leg : 64    Top/Bottom Interval(mm):  480/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   428.00   Rock Type: IGNEOUS
Core:  51   Sample Midpoint(m)     :   431.48   Sect/Pc #:  3/PCE 1D

ROCK = GABBRO;
       Texture: OPHITIC
       WITH 10% MESOSTASIS;
       Where sampled: OTHER
       XENOLITH IN DOLERITE SILL*

Groundmass - OLIVINE                   (    5%)
             Size(mm):        1-2  Morphology: ROUNDED,ANHEDRAL
             PARTLY ALTERED;

             PLAGIOCLASE               (   30%)
             Size(mm):      0.5-3  Morphology: LATH-SHAPED
             ENCLOSED IN PLAG;

             CLINOPYROXENE             (   55%)
             Size(mm):       1-10  Morphology: ANHEDRAL
             APPROX COMP AUGITE,OPHITICALLY ENCLOSES PLAG;

             ILMENITE                  (    3%)
             Size(mm):    0.5-1.0  Morphology: ELONGATE
             POSSIBLY TITAN.MT*

Alteration - CLAY MINERALS             (    5%)
             Location: INTERSTICES    Replacing: MESOSTASIS,OL

             ZEOLITE                   (    5%)
             Location: INTERSTICES    Replacing: MESOSTASIS,FEL
             RARELY REPLACING FEL*




Leg : 64    Top/Bottom Interval(mm): 1110/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   428.00   Rock Type: IGNEOUS
Core:  51   Sample Midpoint(m)     :   432.11   Sect/Pc #:  3/PCE 1I

ROCK = DOLERITE;
       Texture: OPHITIC-INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE
             LARGE CPX/PLAG INTERGROWTHS MAY BE PHENOS BUT ARE
             INCLUDED IN THE GROUNDMASS FIGURES;

             CLINOPYROXENE
             LARGE CPX/PLAG INTERGROWTHS MAY BE PHENOS BUT ARE
             INCLUDED IN THE GROUNDMASS FIGURES*

Groundmass - OLIVINE                   (   10%)
             Size(mm):    0.5-1.0  Morphology: ROUNDED,ANHEDRAL
             OCCASIONALLY ENCLOSED IN CPX;

             PLAGIOCLASE               (   50%)
             Size(mm):    0.5-1.5  Morphology: LATH-SHAPED
             OCCASIONALLY ENCLOSED IN CPX;

             CLINOPYROXENE             (   30%)
             Size(mm):        1-6
             APPROX COMP AUGITE?;LARGE XTLS WITH OPHITIC PLAG
             AND SMALLER INTERGRANULAR XTLS;

             MAGNETITE                 (    5%)
             Size(mm):       TO 1  Morphology: SKELETAL
             APPROX COMP TITAN.MT?,RESORBED XTLS*

Alteration - CLAY MINERALS             (    5%)
             Location: INTERSTICES    Replacing: MESOSTASIS,OL
             REPLACING MESOSTASIS IS QUESTIONABLE*




Leg : 64    Top/Bottom Interval(mm):  300/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   428.00   Rock Type: IGNEOUS
Core:  51   Sample Midpoint(m)     :   432.80   Sect/Pc #:  4/PCE 1B

ROCK = GABBRO;
       Texture: OPHITIC-SUBOPHITIC;
       Where sampled: OTHER
       XENOLITH INSIDE DOLERITIC SILL*

Phenocrysts- PLAGIOCLASE               (   30%)
             Size(mm):        1-3  Morphology: TABULAR LATHS,RADIATING FIBER
             TABULAR LATHS AND QUENCHED MICROLITES WITH
             RADIATING FIBERS;

             CLINOPYROXENE             (   15%)
             Size(mm):        1-4

Groundmass - OLIVINE                   (    4%)
             Size(mm):      0.5-1  Morphology: ROUNDED,ANHEDRAL
             ROUNDED ANHEDRAL GRAINS,REPLACED BY CLAY IN
             PLACES;

             PLAGIOCLASE               (   30%)
             Size(mm):      0.2-1  Morphology: LATHS,ROUND,RADIATING FIBERS
             ROUND MICROLITES WITH RADIATING FIBERS,SOME QUENCH
             TEXTURED MICROLITES + SMALL LATHS;

             CLINOPYROXENE             (    5%)
             Size(mm):    0.2-0.5
             APPROX COMP AUGITE;

             OPAQUE MINERALS           (   10%)
             Size(mm):     0.25-6  Morphology: TABULAR,SUBHEDRAL
             INCLUDES MAGN + ILMENITE,LARGE AND LONG (4-6 MM)
             NEEDLES*

Alteration - COMBINATION               (   10%)
             Location: INTERGRAIN     Replacing: CPX
             Location: BOUNDARIES
             INCLUDES BROWNISH GREEN CLAY.MIN + CLEAR FIBROUS
             ZEOLITES,AFTER CPX*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm): 1130/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   428.00   Rock Type: IGNEOUS
Core:  51   Sample Midpoint(m)     :   436.63   Sect/Pc #:  6/PCE 1H

ROCK = DOLERITE;
       Texture: OPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE
             CPX + PLAG AGGREGATES MAY BE PHENOS BUT ARE
             INCLUDED IN THE GROUNDMASS FIGURES;

             CLINOPYROXENE
             CPX + PLAG AGGREGATES MAY BE PHENOS BUT ARE
             INCLUDED IN THE GROUNDMASS FIGURES*

Groundmass - OLIVINE                   (    4%)
             Size(mm):      0.5-1  Morphology: ANHEDRAL,ROUNDED
             SHOWING ALTERATION TO CLAY;

             PLAGIOCLASE               (   55%)
             Size(mm):      0.5-3  Morphology: LATH-SHAPED
             USUALLY ENCLOSED IN CPX;

             CLINOPYROXENE             (   35%)
             Size(mm):        1-5  Morphology: IRREGULAR,AGGREGATES
             APPROX COMP AUGITE,LARGE IRREGULAR XTLS AND
             OPTICALLY CONTINUOUS AGGREGATES;

             MAGNETITE                 (    1%)
             Size(mm):        0.3  Morphology: IRREGULAR,SUBHEDRAL

Alteration - CLAY MINERALS             (    5%)
             Location: INTERGRANULAR  Replacing: MESOSTASIS,OL,FEL
             REPLACING MESOSTASIS IS QUESTIONABLE,INCIPIENT
             ALTERATION OF FELSPARS*




Leg : 64    Top/Bottom Interval(mm):  850/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   437.00   Rock Type: IGNEOUS
Core:  52   Sample Midpoint(m)     :   445.35   Sect/Pc #:  6/PCE 1D

ROCK = DOLERITE;
       Texture: SUBOPHITIC-INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE
             LARGE PLAG-CPX INTERGROWTHS MAY BE PHENOS;

             CLINOPYROXENE
             LARGE PLAG-CPX INTERGROWTHS MAY BE PHENOS*

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.3-0.6  Morphology: ROUNDED,ANHEDRAL
             PARTIAL ALTERATION TO CLAY;

             PLAGIOCLASE               (   40%)
             Size(mm):    0.5-1.5  Morphology: LATH-SHAPED
             LARGER ONES TEND TO BE IN CPX;

             CLINOPYROXENE             (   20%)
             Size(mm):      0.3-3
             LARGER CPX CONTAIN PLAG (OPHITIC),ALSO SOME
             INTERGRANULAR CPX;

             MAGNETITE                 (    3%)
             Size(mm):    0.3-0.5  Morphology: ANHEDRAL,SKELETAL

Alteration - CLAY MINERALS             (   30%)
             Location: INTERSTITIAL   Replacing: MESOSTASIS,OL
             REPLACING MESOSTASIS IS QUESTIONABLE,GREEN*




Leg : 64    Top/Bottom Interval(mm):  280/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   446.00   Rock Type: IGNEOUS
Core:  53   Sample Midpoint(m)     :   450.78   Sect/Pc #:  4/PCE 1B

ROCK = APHYRIC BASALT
       OR DOLERITE;
       Texture: APHYRIC,INTERGRANULAR-DOLERITIC,COARSE;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE               (   <1%)
             Size(mm):          2  Morphology: TABULAR
             ZONED*

Groundmass - OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   50%)
             Size(mm):    0.3-1.5  Morphology: LATH-SHAPED
             APPROX COMP AN55-60,LATH-SHAPED AND INTERSTITIAL,
             FRESH;

             CLINOPYROXENE             (   30%)
             Size(mm):    0.2-1.5  Morphology: IRREGULAR,ANHEDRAL
             APPROX COMP AUGITE,SUBOPHITIC AND INTERGRANULAR;

             OPAQUE MINERALS           (    4%)
             Size(mm):    0.1-0.5  Morphology: CUBOID-SKELETAL
             INCLUDES MAGN + ILMENITE,INTERGRANULAR*

Alteration - CLAY MINERALS             (   10%)
             Location: INTERGRANULAR  Replacing: MESOSTASIS
             REPLACING MESOSTASIS IS QUESTIONABLE,BROWN,
             ORE-RICH;

             MICA                      (    5%)
             Location: INTERGRANULAR
             BIOTITE?,NOT KNOWN WHAT IS BEING REPLACED*




Leg : 64    Top/Bottom Interval(mm):  760/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   455.00   Rock Type: IGNEOUS
Core:  54   Sample Midpoint(m)     :   455.76   Sect/Pc #:  1/PCE 4B

ROCK = CPX-OL PHYRIC BASALT;
       Texture: PORPHYRITIC,INTERSERTAL,MEDIUM-GRAINED;
       Where sampled: OTHER
       LOWER MARGIN OF SILL*

Phenocrysts- OLIVINE                   (   10%)
             Size(mm):       <0.5  Morphology: SUBHEDRAL-ANHEDRAL
             MICROPHENOS;

             CLINOPYROXENE             (   10%)
             Size(mm):       <0.5  Morphology: SUBHEDRAL-ANHEDRAL
             MICROPHENOS*

Groundmass - PLAGIOCLASE               (   30%)
             Size(mm):        0.3  Morphology: LATHS
             SMALL LATHS;

             OPAQUE MINERALS           (   <5%)
             INCLUDES MAGN + ILMENITE*

Alteration - CLAY MINERALS             (   45%)
             Replacing: GLASS




Leg : 64    Top/Bottom Interval(mm):  500/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   455.00   Rock Type: IGNEOUS
Core:  54   Sample Midpoint(m)     :   457.00   Sect/Pc #:  2/PCE 1B

ROCK = APHYRIC BASALT
       BADLY ALTERED;
       Texture: APHYRIC,INTERSERTAL-INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Groundmass - OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   25%)
             Size(mm):    0.1-0.5  Morphology: LATHS
             SHORT SMALL LATHS;

             CLINOPYROXENE             (   20%)
             Size(mm):    0.1-0.6
             APPROX COMP AUGITE,SMALL INTERGRANULAR XTLS AND
             LARGER OPHITIC XTLS ENCLOSING SOME PLAG;

             OPAQUE MINERALS           (    5%)
             Size(mm):       <0.1  Morphology: ANHEDRAL
             INCLUDES MAGN + ILMENITE*

Alteration - OTHER                     (   50%)
             Location: INTERSTITIAL   Replacing:                IRREGULAR
             A VOID WHICH WAS PROBABLY CLAY.MIN NOW LOST BY
             THIN SECTION PREPARATION*




Leg : 64    Top/Bottom Interval(mm):  820/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   455.00   Rock Type: IGNEOUS
Core:  54   Sample Midpoint(m)     :   457.32   Sect/Pc #:  2/PCE 3A

ROCK = CPX-OL-PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,EQUIGRANULAR,FINE-GRAINED;
       Where sampled: OTHER
       SILL CONTACT*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL
             POSSIBLY CPX (TOO SMALL TO SEE),MICROPHENOS;

             PLAGIOCLASE               (   <3%)
             Size(mm):        0.5  Morphology: LATHS
             MICROPHENOS,BLOCKY INTERGROWN LATHS,ZONED,IN LOWER
             UNIT;

             CLINOPYROXENE             (   10%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL
             MICROPHENOS*

Groundmass - PLAGIOCLASE               (   50%)
             Size(mm):       <0.1  Morphology: LATHS
             SMALL TINY LATHS IN MESOSTASIS;

             OPAQUE MINERALS           (    5%)
             INCLUDES MAGN + ILMENITE;

             GLASS                     (   <5%)

Alteration - COMBINATION               (   30%)
             Location: MESOSTASIS
             INCLUDES CLAY.MIN + ZEOLITES*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm): 1000/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   455.00   Rock Type: IGNEOUS
Core:  54   Sample Midpoint(m)     :   457.50   Sect/Pc #:  2/PCE 4A

ROCK = APHYRIC BASALT;
       Texture: APHYRIC,INTERGRANULAR-INTERSERTAL;
       Where sampled: OTHER
       SILL MARGIN*

Groundmass - OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   30%)
             Size(mm):    0.2-1.0  Morphology: ELONGATE LATHS
             APPROX COMP AN60-65;

             CLINOPYROXENE             (   30%)
             Size(mm):    0.3-1.0  Morphology: IRREGULAR
             APPROX COMP AUGITE,OPTICALLY CONTINUOUS XTLS,
             LARGER XTLS SUBOPHITICALLY ENCLOSE PLAG;

             MAGNETITE                 (    2%)
             Size(mm):    0.1-0.2  Morphology: CUBOID-SUBHEDRAL
             APPROX COMP TITAN.MT,INTERGRANULAR

             MESOSTASIS                (   40%)
             APHANITIC,ALTERED*

Alteration - COMBINATION               (   40%)
             Location: INTERGRANULAR  Replacing: MESOSTASIS
             INCLUDES CLAY.MIN + ZEOLITES*




Leg : 64    Top/Bottom Interval(mm): 1300/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   455.00   Rock Type: IGNEOUS
Core:  54   Sample Midpoint(m)     :   457.80   Sect/Pc #:  2/PCE 4D

ROCK = APHYRIC BASALT;
       Texture: APHYRIC,INTERSERTAL-INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE               (   <1%)
             Size(mm):          1  Morphology: ANHEDRAL
             RESORBED,ZONED*

Groundmass - PLAGIOCLASE               (   35%)
             Size(mm):    0.3-1.5  Morphology: LATHS

             CLINOPYROXENE             (   30%)
             Size(mm):    0.2-0.6  Morphology: ANHEDRAL
             APPROX COMP AUGITE?,SOME LARGER XTLS
             SUBOPHITICALLY ENCLOSE PLAG;

             MAGNETITE                 (    1%)
             Size(mm):       <0.3  Morphology: CUBOID-ELONGATE

Alteration - CARBONATE                 (    1%)
             Location: VESICLES       Replacing: MESOSTASIS
             CALCITE IN VESICLES,POSSIBLY SOME CARB IN
             MESOSTASIS REPLACEMENT;

             CLAY MINERALS             (   30%)
             Location: INTERSTICES    Replacing: MESOSTASIS,CPX
             SOME ALTERATION OF CPX?,GREEN CLAY*

Vesicles   -
             Size(mm):  1.0-1.5
             Percent:     1
             Location: RANDOM
             Filling: CALCITE
             Shape: SPHERICAL




Leg : 64    Top/Bottom Interval(mm):   10/   0  Describer: Saunders, A.
Hole: 478   Top of Core Depth(m)   :   455.00   Rock Type: IGNEOUS
Core:  54   Sample Midpoint(m)     :   458.01   Sect/Pc #:  3/PCE 1A

ROCK = PLAG SPARSELY PHYRIC BASALT;
       Texture: SPARSELY PORPHYRITIC,INTERGRANULAR-INTERSERTAL;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE               (    1%)
             Size(mm):    2.5-3.0  Morphology: LATH-SHAPED
             SLIGHTLY ZONED,RESORBED*

Groundmass - OLIVINE                   (    0%)
             NONE SEEN;

             PLAGIOCLASE               (   30%)
             Size(mm):    0.2-1.0  Morphology: LATH-SHAPED
             APPROX COMP AN60-65;

             CLINOPYROXENE             (   20%)
             Size(mm):    0.2-0.6  Morphology: ANHEDRAL
             APPROX COMP AUGITE,MORE OR LESS EQUIDIMENSIONAL
             WITH PLAG*

Alteration - CLAY MINERALS             (   50%)
             Location: INTERGRANULAR  Replacing: MESOSTASIS,CPX
             GREENISH;

             PYRITE                    (   <1%)
             Location: VEIN




Leg : 64    Top/Bottom Interval(mm):   00/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   455.00   Rock Type: IGNEOUS
Core:  54   Sample Midpoint(m)     :   459.50   Sect/Pc #:  4/PCE 1A

ROCK = CPX MODERATELY PHYRIC BASALT
       SIMILAR TO PIECE 1B OF THIS SECTION (SEE
       DESCRIPTION)--PERHAPS A LITTLE MORE ALTERED;
       Texture: MODERATELY PORPHYRITIC,INTERSERTAL-APHYRIC;
       Where sampled: OTHER
       SILL MARGIN*

Phenocrysts- CLINOPYROXENE             (    5%)
             Size(mm):    0.5-1.5  Morphology: ANHEDRAL

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL
             POSSIBLY ALL CPX?;

             PLAGIOCLASE               (   15%)
             Size(mm):       <0.5  Morphology: LATHS
             SMALL LATHS;

             CLINOPYROXENE             (    5%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL

             OPAQUE MINERALS           (    5%)
             Size(mm):    0.1-0.2
             INCLUDES MAGN + ILMENITE,DISPERSED;

             GLASS                     (   65%)
             TOTALLY ALTERED TO CLAY.MIN + ZEOLITES*

Alteration - COMBINATION               (   65%)
             Location: MESOSTASIS     Replacing: GLASS
             INCLUDES CLAY.MIN + ZEOLITES*




Leg : 64    Top/Bottom Interval(mm):  500/   0  Describer: Fornari, D.
Hole: 478   Top of Core Depth(m)   :   455.00   Rock Type: IGNEOUS
Core:  54   Sample Midpoint(m)     :   460.00   Sect/Pc #:  4/PCE 1B

ROCK = CPX MODERATELY PHYRIC BASALT;
       Texture: MODERATELY PORPHYRITIC,INTERSERTAL-APHYRIC;
       Where sampled: OTHER
       SILL MARGIN*

Phenocrysts- CLINOPYROXENE             (    5%)
             Size(mm):    0.5-1.5  Morphology: ANHEDRAL

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL
             POSSIBLY ALL CPX?;

             PLAGIOCLASE               (   15%)
             Size(mm):       <0.5  Morphology: LATHS
             SMALL LATHS;

             CLINOPYROXENE             (    5%)
             Size(mm):    0.1-0.3  Morphology: ANHEDRAL

             OPAQUE MINERALS           (    5%)
             Size(mm):    0.1-0.2
             INCLUDES MAGN + ILMENITE,DISPERSED;

             GLASS                     (   65%)
             TOTALLY ALTERED TO CLAY.MIN + ZEOLITES*

Alteration - COMBINATION               (   65%)
             Location: MESOSTASIS     Replacing: GLASS
             INCLUDES CLAY.MIN + ZEOLITES*




    

Introduction


Cite as: Deep Sea Drilling Project (1989): Archive of Core and Site/Hole Data and Photographs from the Deep Sea Drilling Project (DSDP). National Geophysical Data Center, NOAA. doi:10.7289/V54M92G2 [access date]

These Web pages are from the Core Data from the Deep Sea Drilling Project Legs 1-96 CD-ROM produced in 1989 and modified in 2000 by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Geophysical Data Center (now part of the National Centers for Environmental Information), and collocated World Data Center for Marine Geology and Geophysics, Boulder (now part of the World Data Service for Geophysics). Data were compiled in cooperation with the U.S. Science Support Program, of the Joint Oceanographic Institutions, Inc. (now the Consortium for Ocean Leadership), and the U.S. National Science Foundation.

Please see NOAA's privacy and disclaimer information. Send questions or comments to mgg.info@noaa.gov.

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