Leg : 63 Top/Bottom Interval(mm): 140/ 170 Describer: Grechin, V.
Hole: 469 Top of Core Depth(m) : 302.00 Rock Type: UNIDENTIFIED
Core: 33 Sample Midpoint(m) : 302.16 Sect/Pc #: 1/
ROCK = VOLCANICLASTIC BRECCIA
SECTION IS 50% PUMICE AND 35% ROCK FRAGMENTS. ROCK
FRAGMENTS INCLUDE BASALT + ANDESITE + DACITE,
SOME FRAGMENTS ARE ROUNDED,OTHER COMPONENTS ARE
QUARTZ (2%) + FELDSPAR (3%) + BIOTITE (TR) + PYX
(TR) + CARB.UNSPEC (2%) + BENTHIC FORAMS (3%) +
BRYOZOANS (5%) + ALGAL MAT (TR)*
Leg : 63 Top/Bottom Interval(mm): 590/ 620 Describer: Grechin, V.
Hole: 469 Top of Core Depth(m) : 302.00 Rock Type: UNIDENTIFIED
Core: 33 Sample Midpoint(m) : 302.61 Sect/Pc #: 1/
ROCK = VOLCANIC PUMICE BRECCIA
MOST FRAGMENTS ARE PUMICE AND IGNEOUS ROCKS.
THERE ARE BOTH INTRUSIVE AND EXTRUSIVE ROCKS
(DIABASE, ANDESITE-BASALT, BASALT,
ANDESITE-DACITE). SOME FRAGMENTS ARE ROUNDED.
THERE ARE SOME ROUNDED FRAGMENTS OF MICA-QUARTZ
SANDSTONE AND ALTERED VOLCANIC GLASS. CEMENT IS
CLAY WITH SOME FORAMS.*
Leg : 63 Top/Bottom Interval(mm): 1180/1210 Describer: Niem, A.
Hole: 469 Top of Core Depth(m) : 302.00 Rock Type: UNIDENTIFIED
Core: 33 Sample Midpoint(m) : 303.20 Sect/Pc #: 1/
ROCK = VOLCANICLASTIC BRECCIA
VOLCANIC ROCK FRAGMENTS: SUBANGULAR TO ANGULAR
FORM IN A SILTY CLAY MATRIX,CLAY MATRIX CONTAINS
SOME FORAMS PARTLY FILLED WITH RADIATING FIBROUS
CALCITE AND ALSO SILT-SIZED CARBONATE XTLS AND
GRAINS AND A FEW SILICEOUS SPONGE SPICULES AND
SILT-SAND SIZE QUARTZ(ANGULAR)AND TRACE MICA AND
PLAGIOCLASE. ROCK FRAGMENTS INCLUDE: 1) DACITE
OR ANDESITE WITH PILOTAXITIC FLOW TEXTURE- PLAG
LATHS WITH A BROWN GLASS GROUNDMASS. 2) PHYRIC TO
VESICULAR BASALT WITH INTERSERTAL TEXTURE, OPAQUE
GROUNDMASS WITH PLAG LATHS AND PHENOCRYSTS OF PLAG
AND PYROXENE. SOME CLASTS HAVE PYROXENE ALTERED
TO FIBROUS GREEN-YELLOW CLAY MINERAL E.G. SERP?,
SOME BASALT HAS QUENCHED TEXTURE (FEATHERY PLAG).
SOME ARE PALAGONITIZED GLASS, SOME VESICLES FILLED
WITH GREEN SMECTITE,OTHER BASALT FRAGMENTS
ALTERED PARTLY TO CALCITE,SOME ZEOLITE?*
Leg : 63 Top/Bottom Interval(mm): 370/ 410 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 368.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 368.89 Sect/Pc #: 1/PCE 1A
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 0.01-1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.05-0.5 Morphology: SUBHEDRAL-ANHEDRAL
QUARTZ ( TR%)
Size(mm): 0.1 Morphology: ANHEDRAL
IDENTITY QUESTIONABLE;
OPAQUE MINERALS ( 7%)
Size(mm): 0.05-0.5 Morphology: ANHEDRAL
Alteration - CARBONATE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 25%)
GREENISH BROWN,IN THE INTERSTICES BETWEEN PLAG
AND PYX*
Leg : 63 Top/Bottom Interval(mm): 900/ 920 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 368.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 369.41 Sect/Pc #: 1/PCE 1E
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 0.05-1 Morphology: EUHEDRAL-ANHEDRAL
CLINOPYROXENE ( 20%)
Size(mm): 0.03-0.4 Morphology: SUBHEDRAL-ANHEDRAL
QUARTZ ( 2%)
Size(mm): 0.3-0.7 Morphology: ANHEDRAL,ROUNDED
OPAQUE MINERALS ( 7%)
Size(mm): 0.03-0.3 Morphology: ANHEDRAL
Alteration - CARBONATE ( 1%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
CLAY MINERALS ( 25%)
IN THE INTERSTICES BETWEEN PLAG AND PYX,GREENISH
AND BROWNISH CLAYS*
Leg : 63 Top/Bottom Interval(mm): 1430/1460 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 368.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 369.95 Sect/Pc #: 1/PCE 1H
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 0.05-1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.03-0.4 Morphology: SUBHEDRAL-ANHEDRAL
QUARTZ ( <1%)
Size(mm): 0.3-0.7 Morphology: ANHEDRAL
THIS MINERAL OCCURS IN CLOSE ASSOCIATION WITH
CLAYS;
OPAQUE MINERALS ( 7%)
Size(mm): 0.03-0.3 Morphology: ANHEDRAL
Alteration - CARBONATE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
CLAY MINERALS ( 25%)
COLORLESS-BROWNISH GREEN,IN THE INTERSTICES
BETWEEN PLAG AND PYX*
Leg : 63 Top/Bottom Interval(mm): 370/ 400 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 368.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 370.39 Sect/Pc #: 2/PCE 1E
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.05-1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 25%)
Size(mm): 0.01-0.1 Morphology: ANHEDRAL-SUBHEDRAL
OPAQUE MINERALS ( 4%)
Size(mm): 0.01-0.1 Morphology: ANHEDRAL
Alteration - CARBONATE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 16%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
AND PYX;
ZEOLITE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX*
Leg : 63 Top/Bottom Interval(mm): 20/ 40 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 371.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 371.53 Sect/Pc #: 1/PCE 1A
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): 0.05-1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 15%)
Size(mm): 0.01-0.1 Morphology: ANHEDRAL-SUBHEDRAL
OPAQUE MINERALS ( 4%)
Size(mm): 0.01-0.1 Morphology: ANHEDRAL
Alteration - CARBONATE ( 2%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 19%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
AND PYX;
ZEOLITE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX*
Vesicles -
Size(mm): <0.2
Percent: TR
Leg : 63 Top/Bottom Interval(mm): 1210/1250 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 371.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 372.73 Sect/Pc #: 1/PCE 1I
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.3-2 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 25%)
Size(mm): 0.5-1 Morphology: ANHEDRAL
OPAQUE MINERALS ( 7%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
Alteration - CARBONATE ( 1%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 25%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
AND PYX;
ZEOLITE ( 2%)
IN THE INTERSTICES BETWEEN PLAG AND PYX*
Leg : 63 Top/Bottom Interval(mm): 20/ 40 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 371.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 373.03 Sect/Pc #: 2/PCE 1A
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.1-0.5 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.05-0.5 Morphology: ANHEDRAL
OPAQUE MINERALS ( 6%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
Alteration - CARBONATE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 23%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
AND PYX;
ZEOLITE ( 2%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
TALC ( TR%)
IDENTITY QUESTIONABLE,IN THE INTERSTICES BETWEEN
PLAG AND PYX*
Leg : 63 Top/Bottom Interval(mm): 660/ 690 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 371.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 373.68 Sect/Pc #: 2/PCE 1A
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.1-1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.05-0.2 Morphology: ANHEDRAL
OPAQUE MINERALS ( 6%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
Alteration - CARBONATE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 23%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
AND PYX;
ZEOLITE ( 2%)
IN THE INTERSTICES BETWEEN PLAG AND PYX,ANALCITE?;
TALC ( TR%)
IDENTITY QUESTIONABLE,IN THE INTERSTICES BETWEEN
PLAG AND PYX*
Leg : 63 Top/Bottom Interval(mm): 1460/1490 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 371.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 374.48 Sect/Pc #: 2/PCE 1D
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.1-1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.05-0.2 Morphology: SUBHEDRAL-ANHEDRAL
OPAQUE MINERALS ( 6%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
Alteration - CARBONATE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 24%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
AND PYX;
ZEOLITE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
TALC ( TR%)
IDENTITY QUESTIONABLE,IN THE INTERSTICES BETWEEN
PLAG AND PYX*
Leg : 63 Top/Bottom Interval(mm): 1030/1060 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 371.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 375.55 Sect/Pc #: 3/PCE 1D
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.1-1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.05-0.5 Morphology: SUBHEDRAL-ANHEDRAL
AUGITE;
OPAQUE MINERALS ( 6%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
Alteration - CARBONATE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 24%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
AND PYX;
ZEOLITE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
TALC ( TR%)
IDENTITY QUESTIONABLE,IN THE INTERSTICES BETWEEN
PLAG AND PYX*
Leg : 63 Top/Bottom Interval(mm): 100/ 140 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 378.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 378.12 Sect/Pc #: 1/PCE 1A
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.1-1 Morphology: EUHEDRAL-ANHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.05-5 Morphology: SUBHEDRAL-ANHEDRAL
AUGITE--A FEW GRAINS SHOW GREEN TINT AT THE RIM;
OPAQUE MINERALS ( 6%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
CLINOPYROXENE ( TR%)
BROWNISH GREEN,IRON-RICH AUGITE?;
AMPHIBOLE ( TR%)
Alteration - CARBONATE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX;
SMECTITE ( 24%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
AND PYX;
ZEOLITE ( TR%)
IN THE INTERSTICES BETWEEN PLAG AND PYX,ALSO A
VERY LOW BIREFRINGENT MINERAL (ANALCITE?)
TALC ( 1%)
IDENTITY UNCERTAIN,IN THE INTERSTICES BETWEEN
PLAG AND PYX*
Leg : 63 Top/Bottom Interval(mm): 320/ 360 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 378.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 379.84 Sect/Pc #: 2/PCE 1C
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 0.1-1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 27%)
Size(mm): 0.05-0.5 Morphology: SUBHEDRAL-ANHEDRAL
HAS A SLIGHTLY PURPLE TINT;
OPAQUE MINERALS ( 7%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
Alteration - CARBONATE ( TR%)
SMECTITE ( 29%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
LATHS;
TALC ( 2%)
IDENTITY UNCERTAIN,IN THE INTERSTICES BETWEEN
PLAG LATHS*
Leg : 63 Top/Bottom Interval(mm): 120/ 150 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 378.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 381.14 Sect/Pc #: 3/PCE 1A
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.1-1 Morphology: EUHEDRAL-SUBHEDRAL
ZONED FROM LABRADORITE TO ANDESINE;
CLINOPYROXENE ( 30%)
Size(mm): 0.05-0.5 Morphology: SUBHEDRAL-ANHEDRAL
AUGITE;
OPAQUE MINERALS ( 8%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
FE-TI OXIDE?*
Alteration - CARBONATE ( TR%)
SMECTITE ( 11%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
LATHS;
TALC ( 1%)
IDENTITY UNCERTAIN,IN THE INTERSTICES BETWEEN
PLAG LATHS*
Leg : 63 Top/Bottom Interval(mm): 520/ 550 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 378.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 383.04 Sect/Pc #: 4/PCE 1E
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.1-1 Morphology: EUHEDRAL-SUBHEDRAL
ZONED FROM LABRADORITE TO ANDESINE;
CLINOPYROXENE ( 20%)
Size(mm): 0.05-1 Morphology: SUBHEDRAL-ANHEDRAL
AUGITE;
OPAQUE MINERALS ( 7%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
FE-TI OXIDE?*
Alteration - CARBONATE ( TR%)
SMECTITE ( 18%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
LATHS;
TALC ( TR%)
IDENTITY UNCERTAIN*
Leg : 63 Top/Bottom Interval(mm): 580/ 610 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 378.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 384.60 Sect/Pc #: 5/PCE 1B
ROCK = DOLERITE;
Texture: APHYRIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 2 Morphology: SUBHEDRAL
CLINOPYROXENE ( TR%)
Size(mm): 1 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.1-0.5 Morphology: EUHEDRAL-SUBHEDRAL
ZONED FROM LABRADORITE TO ANDESINE;
CLINOPYROXENE ( 20%)
Size(mm): 0.05-0.3 Morphology: SUBHEDRAL-ANHEDRAL
AUGITE;
OPAQUE MINERALS ( 7%)
Size(mm): 0.03-0.2 Morphology: ANHEDRAL
FE-TI OXIDES?*
Alteration - CARBONATE ( 2%)
SMECTITE ( 16%)
BROWNISH GREEN,IN THE INTERSTICES BETWEEN PLAG
LATHS;
ZEOLITE ( TR%)
Leg : 63 Top/Bottom Interval(mm): 300/ 330 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 378.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 385.82 Sect/Pc #: 6/PCE 1
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBVARIOLITIC;
Where sampled: CHILLED MARGIN
CHILLED MARGIN OF THE DOLERITE SILL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.01-0.3 Morphology: SKELETAL,NEEDLES
CLINOPYROXENE ( TR%)
Size(mm): 0.01-0.3
OPAQUE MINERALS ( 7%)
Alteration - CARBONATE ( 5%)
Location: VESICLES
SMECTITE ( 30%)
Replacing: GLASS
BROWNISH GREEN,UNCERTAIN IF REPLACING GLASS,IN
THE INTERSTICES BETWEEN PLAGIOCLASES;
ZEOLITE ( 10%)
Replacing: PLAG
Vesicles -
Size(mm): 0.1-0.3
Percent: 8
Shape: IRREGULAR
Leg : 63 Top/Bottom Interval(mm): 730/ 750 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 387.00 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 390.74 Sect/Pc #: 3/
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBVARIOLITIC GROUNDMASS;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 0.1-0.5 Morphology: EUHEDRAL
PSEUDOMORPHS,COMPLETELY ALTERED TO TALC + SMEC +
MAGN,MICROPHENOS
PLAGIOCLASE ( 1%)
Size(mm): 0.1-0.7 Morphology: EUHEDRAL,SKELETAL,PRISMATIC
BOTH PHENOS + MICROPHENOS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.01-0.1 Morphology: SKELETAL,NEEDLES
GLASS ( 63%)
DEVITRIFIED;
OPAQUE MINERALS ( 4%)
Alteration - SMECTITE ( TR%)
Replacing: OL
PALE BROWNISH;
TALC ( TR%)
Replacing: OL
Vesicles -
Size(mm): 1-1.5
Percent: 1
Filling: VOID
Shape: OVAL
Leg : 63 Top/Bottom Interval(mm): 590/ 610 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 396.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 396.60 Sect/Pc #: 1/PCE 6C
ROCK = BASALTIC GLASS
ALTERED;
Texture: CRYPTOCRYSTALLINE GROUNDMASS;
Where sampled: GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 1.5 Morphology: EUHEDRAL
Groundmass - GLASS ( 99%)
COMPLETELY DEVITRIFIED AND ALTERED*
Alteration - CARBONATE
Location: VEIN, Replacing: GLASS
Location: GROUNDMASS
SMECTITE
Replacing: GLASS
YELLOWISH GREEN*
Leg : 63 Top/Bottom Interval(mm): 580/ 600 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 396.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 398.09 Sect/Pc #: 2/PCE 5
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.02 Morphology: SLENDER PRISMS
CLINOPYROXENE ( 15%)
Size(mm): <0.01 Morphology: ANHEDRAL,GRANULAR
OPAQUE MINERALS ( 10%)
MICROCRYST GROUNDMASS ( 35%)
ALTERED MESOSTASIS*
Alteration - SMECTITE
Location: VESICLES Replacing: GLASS
GREEN*
Vesicles -
Size(mm): 0.1-0.3
Percent: 10
Filling: SMEC
Shape: CIRCULAR
SOME FILLED BY SMEC*
Leg : 63 Top/Bottom Interval(mm): 260/ 280 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 396.00 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 399.27 Sect/Pc #: 3/PCE 1D
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.03 Morphology: SLENDER PRISMS
CLINOPYROXENE ( 30%)
Size(mm): <0.02 Morphology: ANHEDRAL,EQUANT
OPAQUE MINERALS
MICROCRYST GROUNDMASS ( 35%)
Alteration - SMECTITE
Location: VESICLES, Replacing: GLASS
Location: MESOSTASIS
BROWNISH GREEN*
Vesicles -
Size(mm): <0.3
Percent: 5
Filling: SMEC
Shape: CIRCULAR
SOME FILLED BY SMEC*
Leg : 63 Top/Bottom Interval(mm): 1400/1420 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 405.00 Rock Type: IGNEOUS
Core: 45 Sample Midpoint(m) : 407.91 Sect/Pc #: 2/PCE 5
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBVARIOLITIC GROUNDMASS;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.5-1 Morphology: EUHEDRAL
CLINOPYROXENE ( <1%)
Size(mm): 0.5-1
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.03 Morphology: SKELETAL NEEDLES
CLINOPYROXENE ( 30%)
Size(mm): <0.02 Morphology: ANHEDRAL,EQUANT
OPAQUE MINERALS ( 10%)
Size(mm): <0.02
MICROCRYST GROUNDMASS ( 17%)
Alteration - SMECTITE
Location: VESICLES, Replacing: GLASS
Location: MESOSTASIS
BROWNISH GREEN*
Vesicles -
Size(mm): <0.2
Percent: 3
Filling: SMEC
Shape: CIRCULAR
SOME FILLED BY SMEC*
Leg : 63 Top/Bottom Interval(mm): 140/ 180 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 414.00 Rock Type: IGNEOUS
Core: 47 Sample Midpoint(m) : 414.16 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VARIOLITIC GROUNDMASS;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2 Morphology: EUHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 38%)
Size(mm): 0.03-0.1 Morphology: SKELETAL NEEDLES
CLINOPYROXENE ( 35%)
Size(mm): 0.03-0.1 Morphology: SKELETAL
OPAQUE MINERALS ( 8%)
MICROCRYST GROUNDMASS ( 15%)
Alteration - SMECTITE
Location: VESICLES
BROWN*
Vesicles -
Size(mm): 0.05-0.1
Percent: 4
Filling: SMEC
Shape: CIRCULAR
SOME FILLED BY SMEC*
Leg : 63 Top/Bottom Interval(mm): 1130/1170 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 423.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 424.15 Sect/Pc #: 1/PCE 9
ROCK = BASALTIC GLASS;
Texture: APHYRIC,HOLOHYALINE;
Where sampled: GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.2-0.3 Morphology: EUHEDRAL
MICROPHENOS*
Groundmass - GLASS ( 99%)
PARTLY DEVITRIFIED BUT MOSTLY FRESH BROWN GLASS*
Alteration - CLAY MINERALS
Location: PILLOW RIM Replacing: GLASS
ZEOLITE ( TR%)
Location: AMYGDALE
Leg : 63 Top/Bottom Interval(mm): 1300/1330 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 423.00 Rock Type: IGNEOUS
Core: 48 Sample Midpoint(m) : 424.32 Sect/Pc #: 1/PCE 11
ROCK = BASALTIC GLASS
ALTERED FRAGMENTS;
Texture: APHYRIC*
Groundmass - GLASS ( 60%)
DEVITRIFIED*
Alteration - CLAY MINERALS ( 30%)
Replacing: GLASS
ZEOLITE ( 10%)
IDENTITY UNCERTAIN,IN THE INTERSTICES BETWEEN
GLASS FRAGMENTS*
Leg : 63 Top/Bottom Interval(mm): 320/ 350 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 432.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 432.34 Sect/Pc #: 1/PCE 5B
ROCK = APHYRIC BASALT;
Texture: APHYRIC,HYALOPILITIC GROUNDMASS;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.5-1 Morphology: EUHEDRAL
CLINOPYROXENE ( TR%)
Size(mm): 1-2 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.1 Morphology: SKELETAL
CLINOPYROXENE ( 10%)
Size(mm): <0.05 Morphology: SKELETAL
GLASS ( 57%)
DEVITRIFIED;
OPAQUE MINERALS ( 10%)
Alteration - SMECTITE
Location: VESICLES
BROWNISH GREEN*
Vesicles -
Size(mm): 0.05-3
Percent: 3
Filling: SMEC
SOME FILLED BY SMEC*
Leg : 63 Top/Bottom Interval(mm): 1030/1060 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 432.00 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 433.05 Sect/Pc #: 1/PCE 9
ROCK = BASALTIC GLASS;
Texture: APHYRIC,HOLOHYALINE;
Where sampled: GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.5-1 Morphology: EUHEDRAL
Groundmass - GLASS ( 95%)
PARTLY DEVITRIFIED*
Alteration - CLAY MINERALS ( 5%)
Location: ALONG CRACKS Replacing: GLASS
Leg : 63 Top/Bottom Interval(mm): 800/ 820 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 441.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 441.81 Sect/Pc #: 1/PCE 7
ROCK = BASALTIC GLASS;
Texture: APHYRIC,HOLOHYALINE;
Where sampled: GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.4 Morphology: EUHEDRAL
MICROPHENOS*
Groundmass - GLASS ( 100%)
PARTLY DEVITRIFIED AND ALTERED TO CLAYS*
Alteration - CLAY MINERALS
Replacing: GLASS
Leg : 63 Top/Bottom Interval(mm): 1070/1080 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 441.00 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 443.58 Sect/Pc #: 2/PCE 5
ROCK = APHYRIC BASALT;
Texture: APHYRIC,HYALOPILITIC-SUBVARIOLITIC;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): <0.1 Morphology: SKELETAL
CLINOPYROXENE ( 30%)
Size(mm): <0.05 Morphology: SKELETAL
GLASS ( 33%)
DEVITRIFIED AND ALTERED;
OPAQUE MINERALS ( 8%)
Size(mm): 0.05
Alteration - SMECTITE
Location: VESICLES
GREEN*
Vesicles -
Size(mm): <0.2
Percent: 4
Filling: SMEC
SOME FILLED BY SMEC*
Leg : 63 Top/Bottom Interval(mm): 730/ 750 Describer: Shibata, T.
Hole: 469 Top of Core Depth(m) : 450.00 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 450.74 Sect/Pc #: 1/PCE 7
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VARIOLITIC;
Where sampled: PILLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.05 Morphology: SKELETAL
CLINOPYROXENE ( 10%)
Size(mm): <0.02 Morphology: SKELETAL
GLASS ( 47%)
DEVITRIFIED;
OPAQUE MINERALS ( 10%)
Size(mm): <0.02
Alteration - SMECTITE
Location: VESICLES
Vesicles -
Size(mm): 0.1-0.2
Percent: 3
Filling: SMEC
Shape: CIRCULAR
PARTLY FILLED BY SMEC*
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