Leg : 63 Top/Bottom Interval(mm): 50/ 70 Describer: Grechin, V.
Hole: 468B Top of Core Depth(m) : 235.00 Rock Type: SEDIMENTARY
Core: 19 Sample Midpoint(m) : 235.06 Sect/Pc #: CC/
ROCK = VOLCANIC SANDSTONE
SECTION CONSISTS OF: QUARTZ 25, FELDSPAR 15,
CLAY 10, VOLCANIC GLASS 8/PUMICE?,
ROCK FRAGMENTS 30, SMECTITE 2/GREEN,ZEOLITE 5,
CARB 5*
Leg : 63 Top/Bottom Interval(mm): 80/ 100 Describer: Shibata, T.
Hole: 468B Top of Core Depth(m) : 235.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 235.09 Sect/Pc #: CC/
ROCK = PLAG MODERATELY PHYRIC DACITE;
Texture: MODERATELY PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 0.3-2 Morphology: ROUNDED
RESORBED*
Groundmass - PLAGIOCLASE ( 30%)
GLASS ( 48%)
DEVITRIFIED;
QUARTZ
MAY BE PRESENT;
OPAQUE MINERALS ( 7%)
Vesicles -
Size(mm): 0.5-3
Percent: 10
Filling: CHALC,QUARTZ
Shape: OVAL
CHALC QUESTIONABLE*
Leg : 63 Top/Bottom Interval(mm): 100/ 150 Describer: Niem, A.
Hole: 468B Top of Core Depth(m) : 244.50 Rock Type: SEDIMENTARY
Core: 20 Sample Midpoint(m) : 244.63 Sect/Pc #: CC/
ROCK = CALCAREOUS SILTY CLAYSTONE
SECTION IS PART OF A SAND LAYER,AT BOTTOM OF SLIDE
CONTAINS VOLCANIC GLASS AND ROUNDED VESICULAR
ANDESITIC ROCK FRAGMENTS - TEXTURE HYALOOPHITIC,
SECTION CONSISTS OF: QUARTZ 15,FELDSPAR 5/MAINLY
ALBITE TWINNED PLAG,MUSCOVITE TR,HEAVY MINERALS
TR/1 GRAIN,CLAY 5, ALTERED VOLCANIC ROCK FRAGMENT
4/SUBROUNDED TO ROUND,VOLCANIC GLASS 2/BROWN,
ALTERED HBL TR/?,GLAUCONITE 1,PYRITE 2, DOLOMITE
56,CIRCULAR AND ELONGATE MOLDS FILLED WITH SPARRY
DOLOMITE+RADS+DIATOMS+ OR - FORAMS 10, SOME
ISOTROPIC DOLOMITE RHOMBS,CHALCEDONY*
Leg : 63 Top/Bottom Interval(mm): 150/ 180 Describer: Shibata, T.
Hole: 468B Top of Core Depth(m) : 244.50 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 244.67 Sect/Pc #: CC/
ROCK = PLAG MODERATELY PHYRIC DACITE;
Texture: MODERATELY PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 0.3-2 Morphology: SUBHEDRAL
CORRODED*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.01-0.1
GLASS ( 31%)
QUARTZ ( TR%)
OPAQUE MINERALS ( 7%)
Alteration - CLAY MINERALS ( TR%)
Vesicles -
Size(mm): 0.2-5
Percent: 7
Filling: CHALC,QUARTZ
Shape: IRREGULAR
CHALC QUESTIONABLE*
Leg : 63 Top/Bottom Interval(mm): 440/ 480 Describer: Niem, A.
Hole: 468B Top of Core Depth(m) : 254.00 Rock Type: SEDIMENTARY
Core: 21 Sample Midpoint(m) : 254.46 Sect/Pc #: 1/
ROCK = CALCAREOUS SILTY CLAYSTONE
QUARTZ+FELDSPAR ROCK FRAGMENTS FLOATING IN A
DOLOMITE MATRIX-SUGGESTING THIS STRATUM IS A
REPLACEMENT PRODUCT,
SECTION CONSISTS OF:QUARTZ 10,FELDSPAR 8/MAINLY
ALBITE TWINNED PLAG,BIOTITE TR,MUSCOVITE TR,
OP.MINS TR, CLAY 15,ALTERED ROCK FRAGMENTS 2/
DACITE-ANDESITIC?,GLAUCONITE 1,PYRITE 2,
DOLOMITE CEMENT 60/DOLOMITE IN FORM OF RHOMBS +
CEMENT*
Leg : 63 Top/Bottom Interval(mm): 40/ 60 Describer: Shibata, T.
Hole: 468B Top of Core Depth(m) : 273.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 273.05 Sect/Pc #: CC/
ROCK = PLAG MODERATELY PHYRIC DACITE;
Texture: MODERATELY PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 4%)
Size(mm): 0.3-2 Morphology: SUBHEDRAL
CORRODED*
Groundmass - PLAGIOCLASE ( 50%)
GLASS ( 32%)
DEVITRIFIED;
QUARTZ ( TR%)
OPAQUE MINERALS ( 7%)
Alteration - CLAY MINERALS ( TR%)
Location: VESICLES
GREENISH*
Vesicles -
Size(mm): 0.5-2
Percent: 7
Filling: CHALC,QUARTZ
Shape: IRREGULAR
CHALC QUESTIONABLE*
Leg : 63 Top/Bottom Interval(mm): 30/ 50 Describer: Grechin, V.
Hole: 468B Top of Core Depth(m) : 282.50 Rock Type: SEDIMENTARY
Core: 24 Sample Midpoint(m) : 282.54 Sect/Pc #: CC/
ROCK = VOLCANIC SANDSTONE
SECTION CONSISTS OF:QUARTZ 25,FELDSPAR 10,CLAY 20,
ROCK FRAGMENTS 30/ROUNDED,CHALCEDONY 1,GLAUCONITE
2/GREEN SMECTITE,ZEOLITE 5/ALTERATION PRODUCT,
PYROXENE TR,CARB.UNSPEC 2*
Leg : 63 Top/Bottom Interval(mm): 70/ 100 Describer: Shibata, T.
Hole: 468B Top of Core Depth(m) : 292.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 292.09 Sect/Pc #: 1/
ROCK = PYROXENE ANDESITE;
Texture: MODERATELY PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 3%)
Size(mm): 0.3-1 Morphology: SUBHEDRAL
SOME SHOW ROUNDED RESORBED MORPHOLOGY;
CLINOPYROXENE ( 2%)
Size(mm): 0.3-0.5 Morphology: EUHEDRAL-SUBHEDRAL
MICROPHENOS,SHOWS FAINTLY PALE GREENISH TINT,SOME
SHOW ROUNDED RESORBED MORPHOLOGY;
OPAQUE MINERALS ( TR%)
Morphology: ANHEDRAL
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): 0.01-0.1 Morphology: SUBHEDRAL-EUHEDRAL,PRISMS
CLINOPYROXENE ( 10%)
Size(mm): 0.01-0.1 Morphology: SUBHEDRAL-EUHEDRAL,PRISMS
GLASS ( 67%)
OPAQUE MINERALS ( 2%)
Morphology: ANHEDRAL
Alteration - CLAY MINERALS ( 3%)
Location: VESICLES
Vesicles -
Size(mm): 0.1-3
Percent: 3
Filling: CLAY.MIN
Shape: LENTICULAR
PARTLY FILLED WITH GREENISH CLAYS*
Leg : 63 Top/Bottom Interval(mm): 170/ 190 Describer: Shibata, T.
Hole: 468B Top of Core Depth(m) : 292.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 292.18 Sect/Pc #: 1/
ROCK = PYROXENE ANDESITE;
Texture: PORPHYRITIC,GLOMEROPORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 0.2-1 Morphology: EUHEDRAL
CLINOPYROXENE ( 5%)
Size(mm): 0.2-1 Morphology: EUHEDRAL
ORTHOPYROXENE ( 2%)
Size(mm): 0.2-1 Morphology: EUHEDRAL
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.01-0.1 Morphology: ACICULAR
MICROLITES;
CLINOPYROXENE ( 15%)
Size(mm): 0.01-0.1 Morphology: ACICULAR
MICROLITES;
GLASS ( 43%)
PARTLY DEVITRIFIED;
OPAQUE MINERALS ( 5%)
Size(mm): 0.01 Morphology: ANHEDRAL,IRREGULAR
Vesicles -
Size(mm): 0.5-3
Percent: 5
Shape: IRREGULAR
Leg : 63 Top/Bottom Interval(mm): 440/ 480 Describer: Niem, A.
Hole: 468B Top of Core Depth(m) : 311.00 Rock Type: SEDIMENTARY
Core: 27 Sample Midpoint(m) : 311.46 Sect/Pc #: 1/
ROCK = CALCAREOUS SILTY CLAYSTONE
SECTION CONSISTS OF: QUARTZ 8,FELDSPAR 5/MAINLY
PLAG,OP.MINS 1,CLAY 15,BASALTIC OR ANDESITIC ROCK
FRAGMENTS 3,GLAUCONITE 1,PYRITE 2/SPHERES,
DOLOMITE RHOMBS+CEMENT 55,PORE SPACE 10*
Leg : 63 Top/Bottom Interval(mm): 0/ 0 Describer: Niem, A.
Hole: 468B Top of Core Depth(m) : 320.50 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 322.09 Sect/Pc #: CC/
ROCK = CALCAREOUS SILTY CLAYSTONE
SECTION INCLUDES 2 DOLOMITIC SILTSTONE LAYERS
WITH A THICKER DOLOMITIC SILTY CLAYSTONE LAYER IN
CENTER,SPONGE SPICULES+RADS + OR - DIATOMS HAVE
BEEN DISSOLVED AND RESULTING VOID SPACES FILLED
IN WITH RADIATING CHALCEDONY XTLS,SOME ARE
GROWING INWARD,DIRTY REDDISH ARGILLACEOUS
CLAYS OR ORGANIC MATTER ARE SUSPENDED IN CENTER
OF VOID BY OPAL?-ISOTROPIC CLEAR MATERIAL THAT
MAY BE OPAL,
SECTION CONSISTS OF: QUARTZ 10,FELDSPAR 5,
VOLCANIC ROCK FRAGMENTS 1,OP.MINS 1/RARE ZIRCON,
CLAY 15/FINELY DISSEMINATED ORGANIC MATTER,
PYRITE 2,DOLOMITE RHOMBS+CEMENT 50,DIATOMS+RADS+
SPONGE SPICULE CIRCULAR AND STRAIGHT MOLDS 15/
FILLED WITH RADIATING CHALCEDONY AND AN ISOTROPIC
CLEAR MATERIAL (OPAL?)*
Leg : 63 Top/Bottom Interval(mm): 1050/1080 Describer: Shibata, T.
Hole: 468B Top of Core Depth(m) : 349.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 350.07 Sect/Pc #: 1/
ROCK = PYROXENE ANDESITE;
Texture: PORPHYRITIC,GLOMEROPORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 0.2-1 Morphology: EUHEDRAL
CLINOPYROXENE ( 4%)
Size(mm): 0.2-1 Morphology: EUHEDRAL
ORTHOPYROXENE ( 2%)
Size(mm): 0.2-1 Morphology: EUHEDRAL
Groundmass - PLAGIOCLASE ( 22%)
Size(mm): 0.01-0.1 Morphology: ACICULAR
MICROLITES;
CLINOPYROXENE ( 16%)
Size(mm): 0.01-0.1 Morphology: ACICULAR
MICROLITES;
GLASS ( 30%)
PARTLY DEVITRIFIED;
OPAQUE MINERALS ( 5%)
Size(mm): 0.01
Vesicles -
Size(mm): 0.3-5
Percent: 5
Shape: IRREGULAR
Leg : 63 Top/Bottom Interval(mm): 810/ 830 Describer: Shibata, T.
Hole: 468B Top of Core Depth(m) : 377.50 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 378.32 Sect/Pc #: 1/
ROCK = ANDESITE
ANDESITIC BRECCIA,HAIR-LIKE CRYSTALLITES AND
PERLITIC CRACKS ARE WELL DEVELOPED IN THE
GROUNDMASS;
Texture: MODERATELY PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 3%)
Size(mm): 0.2-2 Morphology: SUBHEDRAL
RESORBED,CORRODED;
CLINOPYROXENE ( 1%)
Size(mm): 0.2-2 Morphology: SUBHEDRAL
HAS PALE GREENISH TINT*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.01-0.1 Morphology: EUHEDRAL,ACICULAR
CLINOPYROXENE ( 1%)
Size(mm): 0.01-0.1 Morphology: PRISMS
GLASS ( 65%)
OPAQUE MINERALS ( 5%)
Size(mm): 0.01 Morphology: ANHEDRAL
Alteration - CLAY MINERALS ( <1%)
Location: VESICLES,
Location: CRACKS
IDENTITY QUESTIONABLE*
Vesicles -
Size(mm): 0.3-2
Percent: 5
Filling: CLAY.MIN
Shape: LENTICULAR
FILLING IS GREENISH CLAYS?,THE LONG AXES OF THE
LENTICULAR VESICLES ARE ALIGNED PARALLEL TO EACH
OTHER*
Leg : 63 Top/Bottom Interval(mm): 680/ 690 Describer: Grechin, V.
Hole: 468B Top of Core Depth(m) : 406.00 Rock Type: TUFF
Core: 37 Sample Midpoint(m) : 406.69 Sect/Pc #: 1/
ROCK = VITRIC PUMICE TUFF
SECTION CONSISTS OF: QUARTZ 2,FELDSPAR 5,
ROCK FRAGMENTS 5/ROUNDED SEDIMENTARY-CALCAREOUS
CLAYSTONE WITH SAND WITH FORAMS AND NANNOS,
VOLCANIC GLASS AND PUMICE 70,IGNEOUS ROCK FRAGMENT
3,GLAUCONITE TR/GREEN SMECTITE,ZEOLITE 7/GLASS
ALTERATION PRODUCTS,CARB UNSPECIFIED 3,FORAMS 3*
Leg : 63 Top/Bottom Interval(mm): 740/ 770 Describer: Grechin, V.
Hole: 468B Top of Core Depth(m) : 406.00 Rock Type: SEDIMENTARY
Core: 37 Sample Midpoint(m) : 406.76 Sect/Pc #: 1/
ROCK = VOLCANICLASTIC SILTY SANDSTONE
SECTION CONSISTS OF: QUARTZ 15,FELDSPAR 5,
HEAVY MINERALS TR,CLAY 10,ROCK FRAGMENTS 30/
BASALTIC FRAGMENTS AS WELL AS ANDESITE (DACITE)-
SOME FRAGMENTS OF SEDIMENTARY AND A FEW
METAMORPHIC ROCKS,VOLCANIC GLASS 3/ALTERED PUMICE,
BIOTITE TR,GLAUCONITE 4/GREEN SMECTITE,PYRITE 3,
ZEOLITE 5/ALTERATION PRODUCT OF VOLCANIC GLASS
FRAGMENTS,OPAQUE FRAGMENTS 5,CARB.UNSPEC 20/
DISTRIBUTION OF DOLERITE IS IRREGULAR FROM 10 TO
30-40%,FORAMS TR*
Leg : 63 Top/Bottom Interval(mm): 480/ 510 Describer: Grechin, V.
Hole: 468B Top of Core Depth(m) : 406.00 Rock Type: TUFF
Core: 37 Sample Midpoint(m) : 408.00 Sect/Pc #: 2/
ROCK = LAPILLI TUFF
SECTION CONSISTS OF: QUARTZ 15,FELDSPAR 5,ROCK
FRAGMENTS 35/BASALTIC AND ANDESITE-DACITE
FRAGMENTS-SOME ARE ROUNDED,PUMICE 20/IN HAND
SPECIMEN THERE ARE MORE PUMICE LAPILLI FRAGMENTS,
GLAUCONITE 3/GREEN SMECTITE,PYRITE 2,ZEOLITE
5/GLASS ALTERATION PRODUCT/PARTLY IN CEMENT,
DOLOMITE 15*
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