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Core Data from the Deep Sea Drilling Project


Leg : 64    Top/Bottom Interval(mm): 1490/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   515.00   Rock Type: IGNEOUS
Core:  39   Sample Midpoint(m)     :   519.49   Sect/Pc #:  3/PCE 1B

ROCK = PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,QUENCHED
       FINE-GRAINED VARIOLITIC/SUBSPHERULITIC GROUNDMASS
       COMPRISING PLAG MICROLITES + PYX + DISSEMINATED
       OP.MINS + MESOSTASIS;
       Where sampled: NEXT TO GLASSY MARGIN
       SILL EDGE*

Phenocrysts- OLIVINE                   (    0%)

             PLAGIOCLASE               (   15%)
             Size(mm):       TO 2  Morphology: SUBHEDRAL,TABULAR,LATH-SHAPED

             SPINEL                    (    2%)
             Size(mm):    0.1-0.2  Morphology: EUHEDRAL
             CR-SPINEL,MICROPHENOS*

Groundmass - PLAGIOCLASE
             MICROLITES;

             PYROXENE

             OPAQUE MINERALS
             DISSEMINATED;

             MESOSTASIS

Alteration - OTHER                     (   20%)
             Location: PSEUDOMORPHS   Replacing: OL
             MINERAL NOT IDENTIFIED,REPLACING OL IS
             QUESTIONABLE*




Leg : 64    Top/Bottom Interval(mm):  650/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   515.00   Rock Type: IGNEOUS
Core:  39   Sample Midpoint(m)     :   520.15   Sect/Pc #:  4/PCE 8

ROCK = DOLERITE;
       Texture: SUBOPHITIC,SERIATE;
       Where sampled: OTHER
       ABOUT 70 CM BELOW THE SILL/SEDIMENT CONTACT*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):       TO 2  Morphology: SUBHEDRAL
             FRACTURED,ALTERED,GROUNDMASS TO 2 MM*

Groundmass - OLIVINE                   (   10%)
             Size(mm):    0.1-0.6  Morphology: ANHEDRAL-SUBHEDRAL
             ALTERED;

             PLAGIOCLASE               (   40%)
             Size(mm):    0.4-1.0  Morphology: SUBHEDRAL LATHS
             OCCASIONALLY OPHITICALLY ENCLOSED IN PYX,UNZONED,
             APPROX COMP AN50;

             CLINOPYROXENE             (   35%)
             Size(mm):    0.4-1.0  Morphology: ANHEDRAL-EUHEDRAL
             APPROX COMP AUGITE?,PALE BROWN,ENCLOSING PLAG IN

             MAGNETITE                 (    5%)
             Size(mm):        0.1  Morphology: SUBHEDRAL
             GENERALLY INTERSTITIAL;

             ALKALI FELDSPAR           (    5%)
             Size(mm):        0.1
             PERCENTAGE QUESTIONABLE,INTERSTITIAL FELDSPAR,
             PROBABLY PLAG*

Alteration - BOWLINGITE                (  2-3%)
             Replacing: OL
             SURROUNDING OL*

Vesicles   -
             Percent:     0
             NONE SEEN*




Leg : 64    Top/Bottom Interval(mm):  700/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   524.50   Rock Type: IGNEOUS
Core:  40   Sample Midpoint(m)     :   525.20   Sect/Pc #:  1/PCE 2B

ROCK = OL PHYRIC DOLERITE;
       Texture: PORPHYRITIC,SUBDOLERITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (   25%)
             Size(mm):      0.5-2  Morphology: SUBHEDRAL-ANHEDRAL

Groundmass - OLIVINE                   (   10%)
             Size(mm):    0.2-0.5  Morphology: SUBHEDRAL,ROUNDED
             MAY BE MICROPHENOS;

             PLAGIOCLASE               (   40%)
             Size(mm):     TO 1.0  Morphology: SUBHEDRAL LATHS
             APPROX COMP AN52,UNZONED;

             CLINOPYROXENE             (   25%)
             Size(mm):    0.2-0.8  Morphology: ANHEDRAL
             APPROX COMP AUGITE,INTERSTITIAL,BROWN,MAY BE
             TI02-RICH;

             MAGNETITE                 (    2%)
             Morphology: SUBHEDRAL

Alteration - BOWLINGITE                (   <1%)
             Replacing: OL
             AROUND OL XTLS*

Vesicles   -
             Percent:     0
             NONE SEEN*




Leg : 64    Top/Bottom Interval(mm):  380/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   524.50   Rock Type: IGNEOUS
Core:  40   Sample Midpoint(m)     :   526.38   Sect/Pc #:  2/PCE 3E

ROCK = OL PHYRIC DOLERITE;
       Texture: PORPHYRITIC,DOLERITIC-INTERGRANULAR;
       Where sampled: OTHER
       SILL INTERIOR,ADJACENT TO ALTERED VEINS*

Phenocrysts- OLIVINE                   (   30%)
             Size(mm):      0.5-3  Morphology: SUBHEDRAL-EUHEDRAL
             COMPLETELY ALTERED TO GREEN CLAY.MIN (BOWLINGITE)*

Groundmass - OLIVINE                   (   10%)
             Size(mm):    0.3-0.6
             COMPLETELY PSEUDOMORPHED BY BOWLINGITE;

             PLAGIOCLASE               (   30%)
             Size(mm):    0.3-0.8  Morphology: SUBHEDRAL LATHS
             APPROX COMP AN50;

             CLINOPYROXENE             (   30%)
             Size(mm):    0.3-0.8  Morphology: ANHEDRAL
             APPROX COMP AUGITE,INTERSTITIAL TO PLAG;

             MAGNETITE                 (    5%)
             Size(mm):       <0.3  Morphology: SUBHEDRAL

Alteration - COMBINATION               (   40%)
             Location: PSEUDOMORPHS   Replacing: OL
             INCLUDES BWLGITE + TALC,ALL OL REPLACED BY GREEN
             CLAY.MINS*

Vesicles   -
             Percent:     0
             NONE SEEN*




Leg : 64    Top/Bottom Interval(mm): 1290/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   534.00   Rock Type: IGNEOUS
Core:  41   Sample Midpoint(m)     :   541.29   Sect/Pc #:  5/PCE 1A

ROCK = OL-PLAG VITROPHYRIC BASALT;
       Texture: HYALOPILITIC,VARIOLITIC,GLASSY,CHILLED;
       Where sampled: GLASSY MARGIN + NEXT TO GLASSY MARGIN + SEDIMENT
       UPPER CONTACT OF SECOND DOLERITE SILL WITH BASALT
       CHILL ZONE*

Phenocrysts- OLIVINE                   (   15%)
             Size(mm):    0.5-1.2  Morphology: EUHEDRAL
             ALTERED;

             PLAGIOCLASE               (    5%)
             Size(mm):    0.1-0.2  Morphology: LATHS
             MICROPHENOS + CHILL OVERGROWTHS;

             SPINEL                    (    2%)
             Size(mm):        0.1  Morphology: SUBHEDRAL
             CHROMITE MICROPHENOS*

Groundmass - MICROCRYST GROUNDMASS     (   70%)
             Size(mm):       <0.2
             INCLUDES OL + PLAG + CPX,MICROLITES,VERY FINE
             GRAINED,INDISTINGUISHABLE*

Alteration - CARBONATE                 (   10%)
             Location: VEINS,GLASS
             IN NARROW VEINS (0.5 MM) CROSS-CUTTING GLASS +
             SEDIMENT,IN GLASS;

             CLAY MINERALS             (    2%)
             Location: GLASS          Replacing: GLASS




Leg : 64    Top/Bottom Interval(mm):  380/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   534.00   Rock Type: IGNEOUS
Core:  41   Sample Midpoint(m)     :   541.88   Sect/Pc #:  6/PCE 5

ROCK = OL PHYRIC DOLERITE
       OR COARSE BASALT;
       Texture: PORPHYRITIC,DOLERITIC;
       Where sampled: OTHER
       SILL INTERIOR,ADJACENT TO 2 MM WIDE VEIN*

Phenocrysts- OLIVINE                   (   15%)
             Size(mm):      0.3-1  Morphology: SUBHEDRAL-EUHEDRAL
             COMPLETELY REPLACED BY BOWLINGITE*

Groundmass - OLIVINE                   (    5%)
             Size(mm):       0.10
             COMPLETELY REPLACED BY BOWLINGITE;

             PLAGIOCLASE               (   45%)
             Size(mm):   0.10-0.5  Morphology: SUBHEDRAL
             APPROX COMP AN50;

             CLINOPYROXENE             (   30%)
             Size(mm):    0.1-0.5  Morphology: ANHEDRAL
             APPROX COMP AUGITE (TITANIFEROUS?);

             MAGNETITE                 (    2%)
             Size(mm):   0.01-0.1  Morphology: SUBHEDRAL-EUHEDRAL

Alteration - CARBONATE
             Location: VEIN
             CARB COMPOSES 5% OF THE 2 MM WIDE VEIN;

             ZEOLITE
             Location: VEIN
             ZEOLITES COMPOSE 95% OF THE 2 MM WIDE VEIN,
             TRIGONAL? CHABAZITE?;

             BOWLINGITE                (   20%)
             Replacing: OL
             OL COMPLETELY REPLACED*

Vesicles   -
             Percent:     0
             NONE SEEN*




Leg : 64    Top/Bottom Interval(mm):  680/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   543.50   Rock Type: IGNEOUS
Core:  42   Sample Midpoint(m)     :   544.18   Sect/Pc #:  1/PCE 2A

ROCK = OL-PLAG PHYRIC DOLERITE;
       Texture: PORPHYRITIC,SUBOPHITIC,FINE GRAINED;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (   25%)
             Size(mm):      0.5-2  Morphology: SUBHEDRAL-ANHEDRAL
             MOSTLY ALTERED TO BOWLINGITE;

             PLAGIOCLASE               (    2%)
             Size(mm):        0.5  Morphology: SUBHEDRAL,BROAD,TABULAR
             ISOLATED PHENOS;

             SPINEL                    (    2%)
             Size(mm):   0.05-0.1  Morphology: SUBHEDRAL
             RED ?CHROMITE*

Groundmass - OLIVINE                   (   10%)
             Size(mm):       <0.5  Morphology: ANHEDRAL
             ALTERED TO BOWLINGITE;

             PLAGIOCLASE               (   40%)
             Size(mm):    0.2-1.0  Morphology: SUBHEDRAL LATHS
             APPROX COMP AN56;

             CLINOPYROXENE             (   20%)
             Size(mm):    0.2-1.0  Morphology: ANHEDRAL
             APPROX COMP AUGITE,INTERSTITIAL,PALE BROWN;

             MAGNETITE                 (    4%)
             Size(mm):   0.05-0.1

Alteration - BOWLINGITE                (   15%)
             Location: AROUND OL      Replacing: OL
             COMPLETELY REPLACING OL IN PLACES*




Leg : 64    Top/Bottom Interval(mm):  660/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   543.50   Rock Type: IGNEOUS
Core:  42   Sample Midpoint(m)     :   547.16   Sect/Pc #:  3/PCE 5D

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

Groundmass - OLIVINE                   (   10%)
             Size(mm):    0.1-0.2  Morphology: ANHEDRAL
             50% REPLACED BY BOWLINGITE REQUOTED UNDER ALTER.;

             PLAGIOCLASE               (   40%)
             Size(mm):    0.5-1.0  Morphology: SUBHEDRAL
             UNZONED;

             CLINOPYROXENE             (   40%)
             Size(mm):    0.1-0.2  Morphology: ANHEDRAL
             APPROX COMP AUGITE,PALE BROWN,SUBOPHITICALLY
             ENCLOSING PLAG;

             MAGNETITE                 (    3%)
             Size(mm):    0.1-0.2
             MAY BE GROUNDMASS PHASE*

Alteration - CLAY MINERALS             (    2%)
             Location: GROUNDMASS
             FOUND IN GROUNDMASS AROUND VESICLES;

             BOWLINGITE                (    5%)
             Location: SURROUNDING    Replacing: OL
             Location: OL

Vesicles   -
             Size(mm):    1.5-2
             Percent:     2
             Location: RANDOM
             Filling: SMEC
             Shape: SPHERICAL
             FILLING CONSISTS OF THIN LININGS OF GREEN SMEC*




Leg : 64    Top/Bottom Interval(mm): 1180/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   553.00   Rock Type: IGNEOUS
Core:  43   Sample Midpoint(m)     :   554.18   Sect/Pc #:  1/PCE 4J

ROCK = PLAG-OL MODERATELY PHYRIC DOLERITE;
       Texture: MODERATELY PORPHYRITIC,FINE-GRAINED
       ALMOST BASALTIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):        0.5  Morphology: SUBHEDRAL
             MICROPHENOS;

             PLAGIOCLASE               (    5%)
             Size(mm):         <2  Morphology: ELONGATE,TABULAR,SUBHEDRAL
             APPROX COMP AN55-60*

Groundmass - OLIVINE                   (   20%)
             Size(mm):    0.1-0.5  Morphology: SUBHEDRAL
             PROBABLY GROWING IN SITU,INTERSTITIAL;

             PLAGIOCLASE               (   40%)
             Size(mm):    0.2-1.0  Morphology: LATHS,RADIAL CLUSTERS
             RADIAL CLUSTERS (VARIOLES) FREQUENT;

             CLINOPYROXENE
             PROBABLY IN MESOSTASIS;

             MAGNETITE                 (    5%)

             ILMENITE                  (    5%)

             OTHER                     (   20%)
             AMORPHOUS GROUNDMASS,MAINLY ALTERED TO YELLOW
             CLAY.MIN*

Alteration - CLAY MINERALS             (   20%)
             Replacing: MESOSTASIS
             AMORPHOUS MESOSTASIS MAINLY ALTERED TO YELLOW
             CLAY.MIN*

Vesicles   -
             Size(mm):  0.4-0.6
             Percent:     2
             Location: RANDOM
             Filling: CALCITE
             Shape: SPHERICAL
             VESICLES HAVE A MESOSTASIS RIM WITH A CALCITE
             FILLING*




Leg : 64    Top/Bottom Interval(mm):  200/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   553.00   Rock Type: IGNEOUS
Core:  43   Sample Midpoint(m)     :   554.70   Sect/Pc #:  2/PCE 1B

ROCK = APHYRIC BASALT
       OR DOLERITE;
       Texture: APHYRIC,SUBDOLERITIC;
       Where sampled: OTHER
       ADJACENT TO VEIN*

Groundmass - PLAGIOCLASE               (   40%)
             Size(mm):     TO 1.5  Morphology: LATH-SHAPED

             CLINOPYROXENE             (   20%)
             Size(mm):       TO 1  Morphology: ELONGATE,ANHEDRAL
             APPROX COMP AUGITE;

             MAGNETITE                 (    5%)
             Morphology: GRANULAR

             ILMENITE                  (    2%)
             Size(mm):     TO 0.1  Morphology: ELONGATE,SKELETAL,DENDRITIC

Alteration - CLAY MINERALS             (   10%)
             Location: GROUNDMASS,    Replacing: MESOSTASIS,OL
             Location: VESICLES
             ?REPLACING MESOSTASIS OR OL;

             ZEOLITE                   (   20%)
             Location: VEIN

Vesicles   -
             Size(mm):     TO 3
             Percent:     5
             Location: RANDOM
             Filling: CLAY.MIN
             Shape: SPHERICAL
             CLAY.MIN ARE GREEN*




Leg : 64    Top/Bottom Interval(mm):   70/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   562.50   Rock Type: IGNEOUS
Core:  44   Sample Midpoint(m)     :   562.57   Sect/Pc #:  1/PCE 1A

ROCK = PLAG MODERATELY PHYRIC BASALT;
       Texture: MODERATELY PORPHYRITIC,BASALTIC,
       HYALOCRYSTALLINE;
       Where sampled: GLASSY MARGIN*

Phenocrysts- PLAGIOCLASE               (    5%)
             Size(mm):    0.5-1.0  Morphology: LATH-LIKE,TABULAR

Groundmass - PLAGIOCLASE               (   40%)
             Size(mm):   0.05-0.1
             MICROLITES;

             MAGNETITE                 (    5%)
             Size(mm):  0.01-0.02  Morphology: CUBES

Alteration - CLAY MINERALS             (   30%)
             Location: THROUGHOUT     Replacing: MESOSTASIS

             ZEOLITE                   (    5%)
             Location: VESICLES

Vesicles   -
             Size(mm):  0.5-4.0
             Percent:    20
             Location: CHILL ZONE
             Filling: MESOSTASIS,
             Shape: REGULAR,

             Filling: PALAG,ZEOLITES
             Shape: IRREGULAR
             REGULAR SHAPED VESICLES ARE FILLED WITH MESOSTASIS
             AND IRREGULAR SHAPED ONES ARE FILLED WITH PALAG +
             ZEOLITES*




Leg : 64    Top/Bottom Interval(mm): 1050/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   562.50   Rock Type: IGNEOUS
Core:  44   Sample Midpoint(m)     :   563.55   Sect/Pc #:  1/PCE 12A

ROCK = APHYRIC BASALT;
       Texture: APHYRIC,VARIOLITIC,INTERSERTAL*

Groundmass - OLIVINE                   (    0%)

             PLAGIOCLASE               (   50%)
             Size(mm):       <0.5  Morphology: SKELETAL
             VARIOLITIC AGGREGATES;

             CLINOPYROXENE             (   20%)
             Size(mm):       <0.1  Morphology: QUENCH,PLUMOSE
             GROWING ON PLAG;

             MAGNETITE                 (    3%)
             DISSEMINATED;

             MESOSTASIS                (   15%)

Alteration - CLAY MINERALS             (   10%)
             Location: MESOSTASIS,    Replacing: MESOSTASIS
             Location: VESICLES
             GREENISH IN COLOR*

Vesicles   -
             Size(mm):  0.3-0.8
             Percent:    15
             Location: RANDOM
             Filling: MESOSTASIS,
             Shape: SPHERICAL

             Filling: CLAY.MIN




Leg : 64    Top/Bottom Interval(mm):  560/   0  Describer: Fornari, D.
Hole: 474A  Top of Core Depth(m)   :   562.50   Rock Type: IGNEOUS
Core:  44   Sample Midpoint(m)     :   564.56   Sect/Pc #:  2/PCE 8A

ROCK = PLAG-CPX-OL PHYRIC BASALT;
       Texture: PORPHYRITIC,INTERSERTAL-HYALOPILITIC;
       Where sampled: PILLOW INTERIOR
       20 CM BELOW GLASSY SELVAGE OF PILLOW*

Phenocrysts- OLIVINE                   (    2%)
             Size(mm):     TO 0.5  Morphology: EUHEDRAL-SUBHEDRAL
             CORRODED;

             PLAGIOCLASE               (   20%)
             Size(mm):      0.5-2  Morphology: LATHS
             APPROX COMP AN50-60,MICROLITES;

             CLINOPYROXENE             (    5%)
             Size(mm):     0.25-1  Morphology: SUBHEDRAL
             APPROX COMP AUGITE,CORRODED,PROBABLY ALTERED OL*

Groundmass - PLAGIOCLASE               (   15%)

             CLINOPYROXENE             (    5%)

             ILMENITE                  (    5%)

             GLASS                     (   50%)

Alteration - CLAY MINERALS
             Location: VESICLES

             ZEOLITE
             Location: VESICLES

Vesicles   -
             Size(mm):    0.1-1
             Percent:     5
             Location: DISPERSED
             Filling: CLAY.MIN,
             Shape: ROUND-

             Filling: ZEOLITES
             Shape: SUBROUND
             PERIPHERY IS IRREGULAR,VESICLES ARE COMPLETELY
             FILLED*




Leg : 64    Top/Bottom Interval(mm):  380/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   562.50   Rock Type: IGNEOUS
Core:  44   Sample Midpoint(m)     :   565.88   Sect/Pc #:  3/PCE 5B

ROCK = PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,VARIOLITIC GROUNDMASS;
       Where sampled: FLOW INTERIOR*

Phenocrysts- OLIVINE                   (    0%)

             PLAGIOCLASE               (    5%)
             Size(mm):        1-4  Morphology: TABULAR,SUBHEDRAL
             LARGE AGGREGATES,ZONED,RESORBED EDGES;

             PLAGIOCLASE               (   30%)
             Size(mm):    0.4-2.5  Morphology: ELONGATE
             MICROPHENOS;

             CLINOPYROXENE             (    0%)

             SPINEL                    (  2-4%)
             Size(mm):  0.01-0.05  Morphology: CUBIC
             IN GROUNDMASS AND PLAG PHENOS*

Groundmass - OLIVINE                   (    5%)
             Size(mm):       <0.2
             PERCENTAGE QUESTIONABLE,INTERSTITIAL,QUENCHED;

             PLAGIOCLASE               (   20%)
             Size(mm):    0.2-0.5  Morphology: SKELETAL
             MICROLITIC;

             CLINOPYROXENE             (   15%)
             Size(mm):       <0.4  Morphology: SKELETAL,DENDRITIC
             QUENCH;

             MAGNETITE                 (    5%)
             Size(mm):   0.01-0.1  Morphology: ANHEDRAL-CUBIC
             IN GROUNDMASS;

             OTHER                     (   10%)
             AMORPHOUS MESOSTASIS,REPLACED BY CLAY.MIN*

Alteration - CARBONATE                 (    1%)
             Location: VESICLES

             CLAY MINERALS             (   10%)
             Location: RANDOM         Replacing: MESOSTASIS

Vesicles   -
             Size(mm):  0.2-0.5
             Percent:    10
             Location: RANDOM
             Filling: CALCITE,
             Shape: SPHERICAL

             Filling: CLAY.MIN




Leg : 64    Top/Bottom Interval(mm): 1070/   0  Describer: Fornari, D.
Hole: 474A  Top of Core Depth(m)   :   562.50   Rock Type: IGNEOUS
Core:  44   Sample Midpoint(m)     :   569.57   Sect/Pc #:  5/PCE 14A

ROCK = PLAG-OL-CPX PHYRIC BASALT;
       Texture: PORPHYRITIC,SUBOPHITIC,INTERGRANULAR;
       Where sampled: FLOW INTERIOR*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):    0.1-0.3  Morphology: EUHEDRAL-SUBHEDRAL
             PARTIALLY REPLACED;

             PLAGIOCLASE               (   10%)
             Size(mm):       TO 2  Morphology: LATHS

             CLINOPYROXENE             (    5%)
             Size(mm):    0.1-0.3  Morphology: EUHEDRAL-SUBHEDRAL
             APPROX COMP AUGITE?,PARTIALLY REPLACED (PROBABLY
             ALTERED OL)*

Groundmass - OLIVINE                   (   10%)

             PLAGIOCLASE               (   25%)

             CLINOPYROXENE             (   15%)

             ILMENITE                  (    5%)

             GLASS                     (   30%)

Alteration - CLAY MINERALS
             Location: LATH EDGES     Replacing: PLAG LATHS
             MANY CPX AND OL MODERATELY TO COMPLETELY REPLACED
             BY ALTERATION PRODUCTS*

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):   20/   0  Describer: Fornari, D.
Hole: 474A  Top of Core Depth(m)   :   572.00   Rock Type: IGNEOUS
Core:  45   Sample Midpoint(m)     :   572.02   Sect/Pc #:  1/PCE 1

ROCK = PLAG-CPX PHYRIC BASALT;
       Texture: PORPHYRITIC,SUBOPHITIC;
       Where sampled: FLOW INTERIOR
       JUST BELOW PILLOW INTERIORS AS CLAYSTONE OCCURS
       ABOVE*

Phenocrysts- OLIVINE                   (    0%)

             PLAGIOCLASE               (   50%)
             Size(mm):      0.5-2  Morphology: LATHS
             SOME INTERGROWTHS;

             CLINOPYROXENE             (   20%)
             Size(mm):     0.25-5  Morphology: SUBHEDRAL-ANHEDRAL
             TITANIFEROUS;

             SPINEL                    (    0%)

Groundmass - OLIVINE                   (    2%)
             PERCENTAGE QUESTIONABLE;

             PLAGIOCLASE               (   15%)

             CLINOPYROXENE             (    5%)

             OPAQUE MINERALS           (    3%)
             INCLUDES MAGN + ILMENITE;

             GLASS                     (    5%)

Alteration - CARBONATE
             Location: VEINLETS

             CLAY MINERALS             (    0%)

             ZEOLITE
             Location: VEINLETS

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):   70/   0  Describer: Fornari, D.
Hole: 474A  Top of Core Depth(m)   :   572.00   Rock Type: IGNEOUS
Core:  45   Sample Midpoint(m)     :   576.57   Sect/Pc #:  4/PCE 1A

ROCK = PLAG-CPX-OL PHYRIC DOLERITE;
       Texture: PORPHYRITIC,SUBOPHITIC;
       Where sampled: OTHER
       SILL AT BASE OF FLOW*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):   0.25-0.6  Morphology: SUBHEDRAL-ANHEDRAL
             ALL ALTERED AND REPLACED BY BOWLINGITE;

             PLAGIOCLASE               (   50%)
             Size(mm):      0.5-2  Morphology: LATHS

             CLINOPYROXENE             (   10%)
             Size(mm):     0.25-1  Morphology: ANHEDRAL LATHS
             APPROX COMP AUGITE,FRACTURED ALONG CLEAVAGE
             TRACES*

Groundmass - PLAGIOCLASE               (   20%)

             CLINOPYROXENE             (    5%)

             MAGNETITE                 (    3%)
             Size(mm):        0.1

             ILMENITE                  (    3%)
             Size(mm):    0.1-0.3

             GLASS                     (    4%)
             ALTERED*

Alteration - BOWLINGITE                (    5%)
             Location: OL             Replacing: OL

Vesicles   -
             Percent:     0




Leg : 64    Top/Bottom Interval(mm):  100/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   581.00   Rock Type: IGNEOUS
Core:  46   Sample Midpoint(m)     :   581.10   Sect/Pc #:  1/PCE 2A

ROCK = PLAG MODERATELY PHYRIC DOLERITE;
       Texture: MODERATELY PORPHYRITIC,SUBOPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE               (    5%)
             Size(mm):          2  Morphology: TABULAR,AGGREGATES
             RESORBED MAGMA,ZONED*

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.3-0.5  Morphology: ANHEDRAL

             PLAGIOCLASE               (   40%)
             Size(mm):    0.3-1.0  Morphology: LATH-LIKE
             APPROX COMP AN45-55,ZONED,OPHITICALLY ENCLOSED IN
             CPX;

             CLINOPYROXENE             (   40%)
             Size(mm):       TO 2  Morphology: ANHEDRAL,PLATE-LIKE
             APPROX COMP AUGITE,PALE BROWN,PLATE-LIKE XTLS
             FREQUENTLY ENCLOSING PLAG;

             MAGNETITE                 (    5%)
             Size(mm):       <0.5  Morphology: ANHEDRAL-EUHEDRAL




Leg : 64    Top/Bottom Interval(mm): 1100/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   581.00   Rock Type: IGNEOUS
Core:  46   Sample Midpoint(m)     :   582.10   Sect/Pc #:  1/PCE 2F

ROCK = PLAG MODERATELY PHYRIC DOLERITE;
       Texture: MODERATELY PORPHYRITIC,SUBOPHITIC;
       Where sampled: OTHER
       SILL INTERIOR*

Phenocrysts- PLAGIOCLASE               (    5%)
             Size(mm):        2-5  Morphology: TABULAR,AGGREGATES
             RESORBED MARGINS,ZONED*

Groundmass - OLIVINE                   (    5%)
             Size(mm):    0.3-0.5  Morphology: ANHEDRAL

             PLAGIOCLASE               (   40%)
             Size(mm):    0.3-1.0  Morphology: LATH-LIKE
             APPROX COMP AN40-50,OPHITICALLY ENCLOSED IN CPX;

             CLINOPYROXENE             (   40%)
             Size(mm):       TO 2  Morphology: ANHEDRAL,PLATE-LIKE
             APPROX COMP AUGITE,PALE BROWN,PLATE-LIKE XTLS
             FREQUENTLY ENCLOSING PLAG;

             MAGNETITE                 (    5%)
             Size(mm):       <0.5  Morphology: ANHEDRAL-EUHEDRAL

Alteration - BOWLINGITE                (    5%)
             Location: OL             Replacing: OL




Leg : 64    Top/Bottom Interval(mm):  210/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   581.00   Rock Type: IGNEOUS
Core:  46   Sample Midpoint(m)     :   582.71   Sect/Pc #:  2/PCE 3

ROCK = PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,PILOTAXITIC GROUNDMASS;
       Where sampled: FLOW INTERIOR*

Phenocrysts- OLIVINE
             SEE ALTERATION CODES;

             PLAGIOCLASE               (    5%)
             Size(mm):        1-6  Morphology: SUBHEDRAL,TABULAR
             APPROX COMP AN70,MANY INCLUSIONS,RESORBED MARGINS,
             ZONED,MEGACRYSTS;

             PLAGIOCLASE               (   10%)
             Size(mm):      0.5-1  Morphology: SUBHEDRAL,LATH-LIKE OR

             Morphology: TABULAR
             APPROX COMP ?AN60-70;

             SPINEL                    (    3%)
             Size(mm):    0.1-0.2  Morphology: CUBIC
             ?CHROME SPINEL*

Groundmass - PLAGIOCLASE               (   20%)
             Size(mm):    0.2-0.4
             QUENCH TEXTURE,MICROLITES;

             CLINOPYROXENE             (   20%)
             Size(mm):       <0.1  Morphology: DENDRITIC
             QUENCH TEXTURE;

             MAGNETITE                 (   10%)
             Size(mm):       <0.1
             DISSEMINATED,QUENCH TEXTURE;

             OTHER                     (   30%)
             AMORPHOUS GROUNDMASS (MESOSTASIS)*

Alteration - CLAY MINERALS             (    5%)
             Location: GROUNDMASS     Replacing: MESOSTASIS

             BOWLINGITE                (    5%)
             Location: RANDOM         Replacing: OL
             IN EUHEDRAL PSEUDOMORPHS OF OL (0.5-1.0 MM
             ACROSS)*




Leg : 64    Top/Bottom Interval(mm):  350/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   581.00   Rock Type: IGNEOUS
Core:  46   Sample Midpoint(m)     :   582.85   Sect/Pc #:  2/PCE 5

ROCK = PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,PILOTAXITIC GROUNDMASS;
       Where sampled: FLOW INTERIOR*

Phenocrysts- OLIVINE
             SEE ALTERATION SECTION;

             PLAGIOCLASE               (    5%)
             Size(mm):        1-5  Morphology: SUBHEDRAL,TABULAR,AGGREGATES
             APPROX COMP AN70,MANY INCLUSIONS,RESORBED MAGMA,
             MEGACRYSTS;

             PLAGIOCLASE               (   10%)
             Size(mm):      0.5-1  Morphology: SUBHEDRAL,LATH-LIKE,TABULAR
             APPROX COMP ?AN70;

             SPINEL                    (    3%)
             Size(mm):    0.1-0.2  Morphology: CUBIC
             ?CHROME SPINEL*

Groundmass - PLAGIOCLASE               (   15%)
             Size(mm):    0.2-0.4
             MICROLITES AND GROWING ON PHENOS;

             CLINOPYROXENE             (   40%)
             Size(mm):       <0.1  Morphology: DENDRITIC,WHEAT SHEAVES
             PERCENTAGE QUESTIONABLE;

             MAGNETITE                 (    5%)
             Size(mm):       <0.1  Morphology: DISSEMINATED

Alteration - CLAY MINERALS             (    5%)
             Location: VEINS

             BOWLINGITE                (    5%)
             Location: RANDOM         Replacing: OL
             EUHEDRAL PSEUDOMORPHS (0.5-1.0 MM ACROSS)*

Vesicles   -
             Size(mm):        1
             Percent:     5
             Location: RANDOM
             Filling: CLAY.MIN
             Shape: SPHERICAL
             VESICLES HAVE A GREEN CLAY.MIN LINING*




Leg : 64    Top/Bottom Interval(mm): 1100/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   590.00   Rock Type: IGNEOUS
Core:  47   Sample Midpoint(m)     :   591.10   Sect/Pc #:  1/PCE 16

ROCK = PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,VARIOLITIC;
       Where sampled: FLOW INTERIOR
       NEAR CLAY.MIN VEIN*

Phenocrysts- OLIVINE                   (    4%)
             Size(mm):        0.3  Morphology: SUBHEDRAL
             MICROPHENOS;

             PLAGIOCLASE               (   10%)
             Size(mm):        1-5  Morphology: AGGREGATES,TABULAR
             RESORBED EDGES;

             SPINEL                    (   <2%)
             Size(mm):        0.1
             CR-SPINEL*

Groundmass - OLIVINE                   (    5%)
             Size(mm):       <0.3  Morphology: SUBHEDRAL
             PROBABLY MICROPHENOS;

             PLAGIOCLASE               (   40%)
             Size(mm):    0.2-1.0  Morphology: LATHS
             MICROLITES AND LATHS;

             CLINOPYROXENE             (   20%)
             Size(mm):     TO 1.0  Morphology: LATHS,ANHEDRAL
             BROWN AUGITE;

             MAGNETITE                 (    5%)
             Size(mm):     TO 0.3  Morphology: GRANULAR
             DISSEMINATED;

             ILMENITE                  (    2%)

             MICROCRYST GROUNDMASS     (   20%)
             MESOSTASIS*

Alteration - CLAY MINERALS             (    5%)
             Location: GROUNDMASS

Vesicles   -
             Size(mm):  0.8-1.2
             Percent:     4
             Location: RANDOM
             Filling: CLAY.MIN
             Shape: SPHERICAL




Leg : 64    Top/Bottom Interval(mm): 1220/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   590.00   Rock Type: IGNEOUS
Core:  47   Sample Midpoint(m)     :   594.22   Sect/Pc #:  3/PCE 12

ROCK = PLAG-OL PHYRIC BASALT;
       Texture: PORPHYRITIC,VARIOLITIC-QUENCHED,PILOTAXITIC;
       Where sampled: NEXT TO GLASSY MARGIN*

Phenocrysts- OLIVINE                   (  5-8%)
             Size(mm):      0.3-2  Morphology: EUHEDRAL
             MOSTLY REPLACED BY BOWLINGITE;

             PLAGIOCLASE               (   15%)
             Size(mm):      0.5-8  Morphology: AGGREGATES,TABULAR,LATH-SHAPE
             LARGE AGGREGATE MEGACRYSTS,SMALLER TABULAR AND
             LATH-SHAPED PHENOCRYSTS;

             SPINEL                    (    1%)
             Size(mm):        0.1
             RED CHROME SPINEL*

Groundmass - COMBINATION
             INCLUDES OL + PLAG + CPX + MAGN,VERY FINE GRAINED
             WITH PLUMOSE QUENCH PYX AND PILOTAXITIC FELDSPAR
             MICROLITES,DISSEMINATED ORE GRANULES;

             CLINOPYROXENE
             Morphology: PLUMOSE
             QUENCH;

             PLAGIOCLASE
             MICROLITES,PILOTAXITIC;

             MAGNETITE
             DISSEMINATED GRANULES*

Alteration - CLAY MINERALS             (   .5%)
             Location: GROUNDMASS

             BOWLINGITE                (    5%)
             Replacing: OL




Leg : 64    Top/Bottom Interval(mm):  250/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   590.00   Rock Type: IGNEOUS
Core:  47   Sample Midpoint(m)     :   596.25   Sect/Pc #:  5/PCE 3

ROCK = PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,VARIOLITIC GROUNDMASS;
       Where sampled: FLOW INTERIOR*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):    0.1-0.5  Morphology: EUHEDRAL-SUBHEDRAL
             MICROPHENOS,ALTERED TO BOWLINGITE;

             PLAGIOCLASE               (  >60%)
             Size(mm):         13
             AGGREGATE OF INTERGROWN XTLS,MEGACRYSTIC,RESORBED
             WITH SODIUM-RICH MARGIN;

             SPINEL                    (    2%)
             Size(mm):        0.1  Morphology: EUHEDRAL
             RED CHROME SPINEL*

Groundmass - OLIVINE                   (    0%)

             PLAGIOCLASE               (   10%)
             Size(mm):    0.4-1.0  Morphology: LATHS
             LATHS AND MICROLITES,LARGE ONES ARE MICROPHENOS;

             CLINOPYROXENE
             PRESENT BUT INDISTINGUISHABLE FROM GROUNDMASS
             MESOSTASIS;

             MAGNETITE
             DISSEMINATED;

             ILMENITE
             DISSEMINATED;

             MICROCRYST GROUNDMASS     (   20%)
             MESOSTASIS*

Alteration - CLAY MINERALS             (  2-3%)
             Location: MESOSTASIS,OL
             ALTERATION IN MESOSTASIS AND AROUND OLIVINES;

             BOWLINGITE
             Replacing: OL




Leg : 64    Top/Bottom Interval(mm):   50/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   599.00   Rock Type: IGNEOUS
Core:  48   Sample Midpoint(m)     :   599.05   Sect/Pc #:  1/PCE 1A

ROCK = PLAG-OL PHYRIC BASALT;
       Texture: PORPHYRITIC,PILOTAXITIC;
       Where sampled: FLOW INTERIOR*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):    0.3-0.8  Morphology: EUHEDRAL-ANHEDRAL
             BADLY ALTERED;

             PLAGIOCLASE               (    5%)
             Size(mm):       TO 5  Morphology: ROUNDED AGGREGATES
             ABSORBED EDGES,MEGACRYST;

             PLAGIOCLASE               (   10%)
             Size(mm):      0.3-2  Morphology: LATH-LIKE,SUBHEDRAL

             SPINEL                    (    1%)
             Size(mm):    0.1-0.3  Morphology: EUHEDRAL
             RED CR-SPINEL,IN GROUNDMASS AND IN LARGE PLAG*

Groundmass - PLAGIOCLASE               (   30%)
             Size(mm):    0.1-0.6
             MICROLITIC;

             MICROCRYST GROUNDMASS     (   30%)
             INCLUDES CPX + MAGN + ILMENITE + MESOSTASIS,VERY
             FINE GRAINED,INDISTINGUISHABLE*

Alteration - CALCITE                   (    5%)
             Location: VEIN

             BOWLINGITE                (   10%)
             Location: GROUNDMASS     Replacing: OL
             REPLACING OL AND IN GROUNDMASS*

Vesicles   -
             Size(mm):       <1
             Percent:     5
             Location: RANDOM
             Filling: MESOSTASIS
             Shape: SPHERICAL
             FILLING IS IRON-RICH MESOSTASIS,MICROLITES RIM THE
             VESICLES*




Leg : 64    Top/Bottom Interval(mm):  190/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   599.00   Rock Type: IGNEOUS
Core:  48   Sample Midpoint(m)     :   599.19   Sect/Pc #:  1/PCE 1C

ROCK = PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,QUENCHED-SPHERULITIC;
       Where sampled: NEXT TO GLASSY MARGIN*

Phenocrysts- PLAGIOCLASE               (   15%)
             Size(mm):       TO 3  Morphology: SUBHEDRAL-ANHEDRAL

             SPINEL                    (   <1%)
             Size(mm):    0.1-0.2  Morphology: EUHEDRAL
             RED CR-SPINEL*

Groundmass - MICROCRYST GROUNDMASS
             INCLUDES OL + PLAG + CPX + MAGN + ILMENITE,VERY
             FINE-GRAINED MATRIX WITH PLAG MICROLITES,
             SPERULITES SEEN BUT NO GLASS*

Alteration - CLAY MINERALS             (    5%)
             Location: GROUNDMASS     Replacing: MESOSTASIS




Leg : 64    Top/Bottom Interval(mm):  880/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   599.00   Rock Type: IGNEOUS
Core:  48   Sample Midpoint(m)     :   599.88   Sect/Pc #:  1/PCE 7D

ROCK = PLAG-OL PHYRIC BASALT;
       Texture: PORPHYRITIC,PILOTAXITIC-VARIOLITIC;
       Where sampled: PILLOW INTERIOR*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):    0.1-1.0  Morphology: SUBHEDRAL-EUHEDRAL
             OLIVINES VERY FRESH IN THIS SPECIMEN;

             PLAGIOCLASE               (    5%)
             Size(mm):       2-10  Morphology: SUBHEDRAL,TABULAR,AGGREGATES
             APPROX COMP AN70,MANY INCLUSIONS,RESORBED MARGINS,
             MEGACRYSTS;

             PLAGIOCLASE               (   10%)
             Size(mm):    0.5-1.0  Morphology: SUBHEDRAL,LATH-LIKE,TABULAR
             APPROX COMP AN70?;

             SPINEL                    (    3%)
             Size(mm):    0.1-0.2  Morphology: CUBIC
             ?CHROME SPINEL*

Groundmass - PLAGIOCLASE               (   15%)
             Size(mm):    0.1-0.5
             MICROLITES;

             CLINOPYROXENE
             NOT DISTINGUISHABLE FROM MESOSTASIS;

             MAGNETITE                 (    5%)
             DISSEMINATED THROUGHOUT GROUNDMASS;

             MICROCRYST GROUNDMASS     (   60%)
             MESOSTASIS*

Alteration - CLAY MINERALS             (    2%)
             Location: MESOSTASIS     Replacing: MESOSTASIS
             OLIVINES VERY FRESH IN THIS SPECIMEN*

Vesicles   -
             Percent:     0
             NONE SEEN*




Leg : 64    Top/Bottom Interval(mm): 1410/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   599.00   Rock Type: IGNEOUS
Core:  48   Sample Midpoint(m)     :   601.91   Sect/Pc #:  2/PCE 13C

ROCK = PLAG MODERATELY PHYRIC BASALT
       SMALL SLIDE SAMPLE;
       Texture: MODERATELY PORPHYRITIC,SUBSPHERULITIC;
       Where sampled: NEXT TO GLASSY MARGIN*

Phenocrysts- PLAGIOCLASE               (   10%)
             Size(mm):    0.2-1.5  Morphology: LATH-LIKE
             QUENCH OVERGROWTHS DEVELOPING;

             OLIVINE                   (    0%)
             NOTE ABSENCE OF OL PHENOS*

Groundmass - MICROCRYST GROUNDMASS     (   80%)
             INCLUDES PLAG + CPX + MAGN + MESOSTASIS,TOO FINE
             TO BE DISTINGUISHED*

Alteration - ZEOLITE                   (   10%)
             Location: VEIN,
             Location: VESICLES

Vesicles   -
             Size(mm):      0.5
             Percent:    <1
             Location: RANDOM
             Filling: ZEOLITE
             Shape: SPHERICAL
             RARE*




Leg : 64    Top/Bottom Interval(mm):  140/   0  Describer: Fornari, D.
Hole: 474A  Top of Core Depth(m)   :   608.00   Rock Type: IGNEOUS
Core:  49   Sample Midpoint(m)     :   609.64   Sect/Pc #:  2/PCE 3

ROCK = PLAG-CPX PHYRIC BASALT;
       Texture: PORPHYRITIC,HYALOPILITIC;
       Where sampled: FLOW INTERIOR
       BASE OF A PILLOW SEQUENCE*

Phenocrysts- OLIVINE                   (    2%)
             Size(mm):   0.25-0.5  Morphology: EUHEDRAL-SUBHEDRAL
             ALTERED TO BOWLINGITE,MICROPHENOS;

             PLAGIOCLASE               (   30%)
             Size(mm):        2-4
             MEGACRYSTS,COMMONLY NORMALLY ZONED,INCLUSIONS OF
             CUBIC BLEBS OF GLASS;

             CLINOPYROXENE             (    5%)
             Size(mm):      0.5-1  Morphology: EUHEDRAL-SUBHEDRAL
             APPROX COMP AUGITE,PSEUDOMORPHED BY ALTERATION
             MINS*

Groundmass - PLAGIOCLASE               (   20%)

             CLINOPYROXENE             (    5%)

             OPAQUE MINERALS           (    4%)
             INCLUDES MAGN + ILMENITE;

             GLASS                     (   30%)

Alteration - CLAY MINERALS
             Location: VESICLES

             ZEOLITE
             Location: VESICLES

             BOWLINGITE
             Replacing: OL

Vesicles   -
             Size(mm): 0.5-0.75
             Percent:    <1
             Filling: CLAY.MIN,
             Shape: ROUND

             Filling: ZEOLITES




Leg : 64    Top/Bottom Interval(mm):  300/   0  Describer: Fornari, D.
Hole: 474A  Top of Core Depth(m)   :   608.00   Rock Type: IGNEOUS
Core:  49   Sample Midpoint(m)     :   609.80   Sect/Pc #:  2/PCE 4

ROCK = PLAG PHYRIC BASALT
       PILLOW BASALT;
       Texture: PORPHYRITIC,PILOTAXITIC;
       Where sampled: GLASSY MARGIN + NEXT TO GLASSY MARGIN*

Phenocrysts- PLAGIOCLASE               (   30%)
             Size(mm):      0.5-4  Morphology: LATHS
             LATHS AND MEGACRYSTS,MANY NORMALLY ZONED*

Groundmass - PLAGIOCLASE               (   20%)
             Size(mm):   0.25-0.5  Morphology: LATH
             MICROLITES + TINY LATHS;

             GLASS                     (   50%)
             SOME ALTERED TO PALAGONITE,SIDEROMELANE*

Alteration - PALAGONITE
             Replacing: GLASS
             SOME GLASS ALTERED TO PALAG/SIDEROMELANE*




Leg : 64    Top/Bottom Interval(mm):  470/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   617.00   Rock Type: IGNEOUS
Core:  50   Sample Midpoint(m)     :   617.47   Sect/Pc #:  1/PCE 3

ROCK = PLAG MODERATELY PHYRIC BASALT;
       Texture: MODERATELY PORPHYRITIC,FINE-GRAINED,VARIOLITIC;
       Where sampled: FLOW INTERIOR
       ADJACENT TO VEINED AND SHEARED AREA*

Phenocrysts- PLAGIOCLASE               (   10%)
             Size(mm):       TO 5  Morphology: TABULAR,ROUNDED,LATH-SHAPED
             LARGE TABULAR ROUNDED MEGACRYSTS AND SMALLER
             LATH-SHAPED PHENOS*

Groundmass - MICROCRYST GROUNDMASS
             INCLUDES OL + PLAG + CPX + MAGN + ILMENITE,VERY
             FINE-GRAINED QUENCHED GROUNDMASS COMPRISING PLAG
             MICROLITES + WHEATSHEAF PYX + ORE*




Leg : 64    Top/Bottom Interval(mm):  620/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   617.00   Rock Type: IGNEOUS
Core:  50   Sample Midpoint(m)     :   619.12   Sect/Pc #:  2/PCE 5E

ROCK = PLAG PHYRIC BASALT;
       Texture: PORPHYRITIC,VARIOLITIC;
       Where sampled: OTHER
       ADJACENT TO VEIN*

Phenocrysts- OLIVINE                   (    5%)
             Size(mm):       <0.5  Morphology: ANHEDRAL
             MICROPHENOS,MAY PARTIALLY BE GROUNDMASS OL;

             PLAGIOCLASE               (   10%)
             Size(mm):      0.5-2  Morphology: LATH-SHAPED,ROUND,TABULAR
             LATH-SHAPED AND LARGE ROUNDED TABULAR MEGACRYSTS*

Groundmass - OLIVINE
             SEE PHENOCRYSTS CODES;

             PLAGIOCLASE               (   30%)
             Size(mm):    0.1-0.5  Morphology: LATHS
             MICROLITES;

             MICROCRYST GROUNDMASS
             INCLUDES CPX + MAGN + ILMENITE,FINE-GRAINED
             GROUNDMASS*

Alteration - CARBONATE                 (  1-2%)
             Location: VESICLES

             CLAY MINERALS             (    5%)
             Location: MESOSTASIS,
             Location: VESICLES

             ZEOLITE                   (    5%)
             Location: VEIN

Vesicles   -
             Size(mm):        1
             Percent:     5
             Location: RANDOM
             Filling: CLAY.MIN,
             Shape: SPHERICAL

             Filling: CALCITE




Leg : 64    Top/Bottom Interval(mm):  720/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   617.00   Rock Type: IGNEOUS
Core:  50   Sample Midpoint(m)     :   619.22   Sect/Pc #:  2/PCE 7A

ROCK = PLAG MODERATELY PHYRIC BASALT;
       Texture: MODERATELY PORPHYRITIC,VARIOLITIC;
       Where sampled: FLOW INTERIOR*

Phenocrysts- PLAGIOCLASE               (    8%)
             Size(mm):    0.5-1.3  Morphology: TABULAR,LATH-LIKE,EQUANT
             HEAVILY RESORBED*

Groundmass - OLIVINE                   (    5%)
             Size(mm):       <0.5  Morphology: ANHEDRAL,SKELETAL
             PERCENTAGE QUESTIONABLE,GROUNDMASS OR
             MICROPHENOS?;

             PLAGIOCLASE               (   50%)
             Size(mm):       <1.0  Morphology: LATH-LIKE

             MICROCRYST GROUNDMASS     (   30%)
             INCLUDES CPX + MAGN + ILMENITE,VERY FINE-GRAINED,
             PERCENTAGE APPROXIMATE*

Alteration - CLAY MINERALS             (    5%)
             Location: GROUNDMASS,
             Location: VESICLES
             LOCATED THROUGHOUT GROUNDMASS*

Vesicles   -
             Size(mm):  0.3-1.0
             Percent:    10
             Location: RANDOM
             Filling: CLAY.MIN
             Shape: SPHERICAL




Leg : 64    Top/Bottom Interval(mm): 1460/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   617.00   Rock Type: IGNEOUS
Core:  50   Sample Midpoint(m)     :   621.46   Sect/Pc #:  3/PCE 12

ROCK = PLAG MODERATELY PHYRIC DOLERITE
       OR COARSE BASALT;
       Texture: MODERATELY PORPHYRITIC,INTERGRANULAR-SUBOPHITIC;
       Where sampled: FLOW INTERIOR
       OR SILL INTERIOR*

Phenocrysts- OLIVINE
             SEE ALTERATION CODES;

             PLAGIOCLASE               (    5%)
             Size(mm):      0.5-2  Morphology: TABULAR,LATH-LIKE

Groundmass - OLIVINE
             SEE ALTERATION CODES,SUBOPHITICALLY INTERGROWN
             WITH PLAG + CPX;

             PLAGIOCLASE               (   40%)
             Size(mm):      0.2-1  Morphology: LATH-LIKE
             SUBOPHITICALLY INTERGROWN WITH OL + CPX;

             CLINOPYROXENE             (   30%)
             Size(mm):    0.2-1.5  Morphology: ANHEDRAL
             APPROX COMP AUGITE,SUBOPHITICALLY INTERGROWN WITH
             OL + PLAG;

             MAGNETITE                 (    5%)

             ILMENITE                  (    2%)

Alteration - BOWLINGITE                (   20%)
             Replacing: OL PHENOS,OL
             Replacing: GROUNDMASS
             PSEUDOMORPHS,REPLACES BOTH OL PHENOS + GROUNDMASS
             OL*




Leg : 64    Top/Bottom Interval(mm):  160/   0  Describer: Saunders, A.
Hole: 474A  Top of Core Depth(m)   :   617.00   Rock Type: IGNEOUS
Core:  50   Sample Midpoint(m)     :   621.66   Sect/Pc #:  4/PCE 1C

ROCK = PLAG MODERATELY PHYRIC DOLERITE
       OR COARSE BASALT;
       Texture: MODERATELY PORPHYRITIC,INTERGRANULAR-SUBOPHITIC;
       Where sampled: FLOW INTERIOR
       OR SILL INTERIOR*

Phenocrysts- OLIVINE
             SEE ALTERATION CODES;

             PLAGIOCLASE               (    5%)
             Size(mm):      0.5-2  Morphology: TABULAR,LATH-LIKE

Groundmass - OLIVINE
             SEE ALTERATION CODES;

             PLAGIOCLASE               (   40%)
             Size(mm):      0.2-1  Morphology: LATH-LIKE
             PARTIALLY ENCLOSED IN CPX;

             CLINOPYROXENE             (   30%)
             APPROX COMP AUGITE,PARTIALLY ENCLOSED IN PLAG;

             MAGNETITE                 (    5%)
             Size(mm):    0.1-0.5  Morphology: CUBIC,ANHEDRAL
             INTERGRANULAR;

             ILMENITE                  (    2%)
             Morphology: ELONGATE
             PERCENTAGE QUESTIONABLE*

Alteration - BOWLINGITE                (   20%)
             Replacing: OL PHENOS,OL
             Replacing: GROUNDMASS
             PSEUDOMORPHS,REPLACES BOTH OL PHENOS + GROUNDMASS
             OL*




    

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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