Leg : 45 Top/Bottom Interval(mm): 270/ 400 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 7.50 Rock Type: IGNEOUS
Core: 2 Sample Midpoint(m) : 13.84 Sect/Pc #: 5/
ROCK = SERPENTINITE;
Where sampled: PEBBLE IN NANNO OOZE*
Groundmass - MAGNETITE ( 5%)
Morphology: INTERSTITIAL,DENDRITIC
CHROMITE ( 10%)
BROKEN XTLS*
Alteration - SERPENTINITE ( 85%)
Leg : 45 Top/Bottom Interval(mm): 770/ 0 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 7.50 Rock Type: IGNEOUS
Core: 2 Sample Midpoint(m) : 14.27 Sect/Pc #: 5/
ROCK = SERPENTINITE;
Where sampled: PEBBLE IN CORE 2*
Phenocrysts- OLIVINE ( 7%)
Size(mm): 0.5
SOME ALTERATION AND SHEAR*
Groundmass - MAGNETITE ( 5%)
Size(mm): 0.05
IN VEINS WITH SERPENTINE*
Alteration - SERPENTINITE ( 90%)
Leg : 45 Top/Bottom Interval(mm): 630/ 0 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 7.50 Rock Type: IGNEOUS
Core: 2 Sample Midpoint(m) : 15.63 Sect/Pc #: 6/
ROCK = SERPENTINITE
FROM PERIDOTITE*
Groundmass - MAGNETITE ( 10%)
SPINEL ( <1%)
Alteration - CLAY MINERALS ( <1%)
SERPENTINITE ( 90%)
Replacing: OL,PYX
ROCK IS 100% SERPENTINIZED, FROM PSEUDOMORPH OF
PYX, THE ORIGINAL COMP IS ESTIMATED TO BE OL-90,
PYX(PROBABLY OPX)-10,THIS SECTION TOO SMALL TO
ESTIMATE THE ORIGINAL COMP OF BULK ROCK*
Leg : 45 Top/Bottom Interval(mm): 200/ 220 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 17.03 Rock Type: IGNEOUS
Core: 3 Sample Midpoint(m) : 17.24 Sect/Pc #: 0/
ROCK = SERPENTINITE
FROM PERIDOTITE*
Phenocrysts- ORTHOPYROXENE ( 15%)
Size(mm): 2
REMNANT PHENOS*
Groundmass - PLAGIOCLASE ( TR%)
CLINOPYROXENE ( TR%)
EXSOLVED IN OPX;
OLIVINE ( TR%)
CHROMITE ( 2%)
Size(mm): 0.4
CRACKED;
MAGNETITE ( 3%)
Alteration - SERPENTINITE ( 70%)
CHLORITE ( 10%)
THE PRIMARY MINERALS HAVE ALTERED TO A FINE
GRAINED MOSAIC OF CHLORITE+SERP*
Leg : 45 Top/Bottom Interval(mm): 40/ 70 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 17.03 Rock Type: IGNEOUS
Core: 3 Sample Midpoint(m) : 17.39 Sect/Pc #: 1/PCE 1
ROCK = PYROXENITE
GRANULAR AGGREGATE OF PYX XTLS IN CHLORITE VEINS
WHICH CONTAIN IDOCRASE;
Texture: GRANULAR
CATACLASTIC*
Groundmass - CLINOPYROXENE ( 75%)
Size(mm): 0.4
EXSOLUTION LAMELLAE,PYX MESSY ALTERED AND
FRACTURED;
MAGNETITE ( TR%)
Alteration - CHLORITE ( 20%)
SMALL;
IDOCRASE ( 5%)
0.2MM*
Leg : 45 Top/Bottom Interval(mm): 370/ 0 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 26.57 Rock Type: IGNEOUS
Core: 4 Sample Midpoint(m) : 26.94 Sect/Pc #: 1/
ROCK = APHYRIC BASALT;
Texture: GLASSY, APHYRIC
BRECCIA OF PALAGONITE IN GLASSY GROUNDMASS;
Where sampled: PEBBLE IN CORE 4*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.3
APPROX COMP BY ALBITE METHOD IS AN60;
CLINOPYROXENE ( TR%)
Size(mm): 0.2
OLIVINE ( TR%)
Size(mm): 0.2
PHENOS SET INDISCRIMINATELY IN GROUNDMASS OR IN
PALAGONITE*
Groundmass - GLASS ( 60%)
DEVITRIFIED,CLEAR*
Alteration - PALAGONITE ( 40%)
PALE BROWN ANGULAR FRAGMENTS SET IN BRIGHT
DEVITRIFIED GLASSY GROUNDMASS*
Vesicles -
Percent: TR
Leg : 45 Top/Bottom Interval(mm): 720/ 740 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 36.10 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 43.03 Sect/Pc #: 5/
ROCK = SERPENTINITE
FROM PSEUDOMORPHS OF PYX ROCK IS ESTIMATED TO HAVE
BEEN COMPOSED OF OL 70% PYX 30%,ROCK IS 100%,
SERPENTINIZED*
Groundmass - MAGNETITE ( 7%)
SPINEL ( 1%)
PICOTITE, SOME OXIDIZED ON THEIR RIMS*
Alteration - SERPENTINITE ( 90%)
Leg : 45 Top/Bottom Interval(mm): 1500/ 0 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 55.15 Rock Type: IGNEOUS
Core: 7 Sample Midpoint(m) : 56.65 Sect/Pc #: 1/
ROCK = SERPENTINITE
ROCK IS 80% SERPENTINIZED*
Phenocrysts- ORTHOPYROXENE ( 15%)
Size(mm): 2 Morphology: ROUNDED
Groundmass - MAGNETITE ( 5%)
IN VEINS*
Alteration - SERPENTINITE ( 80%)
Location: THROUGHOUT
Leg : 45 Top/Bottom Interval(mm): 0/ 0 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 83.70 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 88.30 Sect/Pc #: CC/PCE 1
ROCK = SERPINTINIZED PERIDOTITE
80% SERPENTINIZED;
Phenocrysts- ORTHOPYROXENE ( 20%)
Size(mm): 4
Groundmass - MAGNETITE ( 10%)
IN VEINS*
Alteration - CHLORITE ( TR%)
SERPENTINITE ( 70%)
Leg : 45 Top/Bottom Interval(mm): 1/ 0 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 83.70 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 88.20 Sect/Pc #: CC/PCE 2
ROCK = FELSPATHIC GABBRO;
Texture: CUMULATE*
Phenocrysts- PLAGIOCLASE ( 80%)
Size(mm): 2 Morphology: ROUNDED AGGREGATES
COMP BY ALBITE METHOD IS AN 80, ALBITE TWINNING*
Groundmass - MAGNETITE ( 2%)
Size(mm): 0.01
DISPERSED,MASSIVE
CHROMITE ( TR%)
Size(mm): 0.03 Morphology: ANHEDRAL
Alteration - SERPENTINITE ( 5%)
Location: VEINS Replacing: PYROXENE
CHLORITE ( 13%)
Location: VEINS Replacing: PYROXENE
PERCENTAGE UNCERTAIN FOR CHLORITE, INTERSTITIAL
AND ROUNDED AREAS OF ALTERATION PRODUCTS*
Leg : 45 Top/Bottom Interval(mm): 2/ 0 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 83.70 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 88.20 Sect/Pc #: CC/PCE 4
ROCK = SERPENTINIZED PERIDOTITE;
Phenocrysts- OLIVINE ( 40%)
2V 90,COMP FO90,COMPLETELY SERPENTINIZED;
CLINOPYROXENE ( 5%)
PARTLY PRESERVED;
ORTHOPYROXENE ( 55%)
2V 85.COMP EN85.PARTLY PRESERVED, ALL ABUNDANCES
ARE ESTIMATES OF ORIGINAL COMP, CPX+OPX HAVE
EXSOLUTION LAMELLAE PROBABLY DUE TO SHEARING*
Groundmass - MAGNETITE ( 5%)
SERPENTINIZATION PRODUCT;
SPINEL ( TR%)
PICOTITE,PRIMARY MINERAL*
Alteration - SERICITE
CHLORITE ( TR%)
Leg : 45 Top/Bottom Interval(mm): 270/ 320 Describer: Prosser, E.
Hole: 395 Top of Core Depth(m) : 93.23 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 95.03 Sect/Pc #: 2/PCE 5
ROCK = PLAG-OL-CPX MICROPHYRIC BASALT
WELL DEVELOPED QUENCH SECTION;
Texture: COARSE GRAINED,INTERSTITIAL, MICROPORPHYRITIC
RADIAL AGGREGATES OF PL MICROPHENOS, PARTLY
GLOMEROPHYRIC, TEX OF MICROPHENOS IS INTERSTITIAL
AND DEVITRIFIED*
Phenocrysts- PLAGIOCLASE ( 40%)
Size(mm): 3 Morphology: SUBHEDRAL
COLORLESS 2V 70-80 BY ALBITE METHOD, ALBITE TWINS,
WITH CORES OF GLASS AND DEVITRIFIED GLASS,
MICROPHENOS;
CLINOPYROXENE ( 5%)
Size(mm): 0.4 Morphology: SUBHEDRAL
MICROPHENOS;
OLIVINE ( 30%)
Size(mm): 0.2 Morphology: SUBHEDRAL
MICROPHENOS, IDDINGS RIMS*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): 0.15 Morphology: SUBHEDRAL
OLIVINE
ID UNCERTAIN FOR OL;
ORTHOPYROXENE
ID UNCERTAIN FOR OPX;
MAGNETITE ( TR%)
GLASS ( 15%)
MOSTLY DEVITRIFIED,ALTERED TO SMECTITE;
ILMENITE ( 1-2%)
Alteration - CHLORITE ( TR%)
Location: OL RIMS Replacing: OL
SMECTITE ( 15%)
Replacing: GLASS
ALMOST ALL GLASS NOW ORANGE-YELLOW SMEC*
Leg : 45 Top/Bottom Interval(mm): 400/ 430 Describer: Zolotarev, B.
Hole: 395 Top of Core Depth(m) : 93.23 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 95.15 Sect/Pc #: 2/PCE 9
ROCK = PLAG-CPX MICROPHYRIC BASALT;
Texture: MICROGLOMEROPORPHYRIC, MICROPHYRIC,FINE-GRAINED*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): 0.5-4 Morphology: SUBHEDRAL
AN70-75,MICROPHENOS,PLAG IS COMBINATION OF
MICROPHENOS AND QUENCH XTLS SET IN GLASS,GLASS
CONTAINS PLAG MICROLITES;
CLINOPYROXENE ( 10%)
Size(mm): 0.4-1 Morphology: SUBHEDRAL
MICROPHENOS;
OLIVINE ( TR%)
Size(mm): 0.2
MICROPHENOS,SOME RIMMED WITH MAGN*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.04-0.4 Morphology: SUBHEDRAL
QUENCH;
CLINOPYROXENE
ID UNCERTAIN;
MAGNETITE ( 0.1%)
Size(mm): 0.04
GLASS ( 30%)
PALE BROWN*
Alteration - SMECTITE
YELLOW IN GLASS,YELLOW COLOR*
Leg : 45 Top/Bottom Interval(mm): 1200/1260 Describer: Zolotarev, B.
Hole: 395 Top of Core Depth(m) : 93.23 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 95.96 Sect/Pc #: 2/PCE 12L
ROCK = PLAG-CPX MICROPHYRIC BASALT;
Texture: INTERSERTAL, MICROPORPHYRITIC,FINE-GRAINED;
Phenocrysts- PLAGIOCLASE ( 60%)
Morphology: SUBHEDRAL,LATHS
COMP AN70-75,MICROPHENOS;
CLINOPYROXENE ( 10%)
Morphology: SUBHEDRAL
MICROPHENOS;
OLIVINE ( TR%)
Morphology: SUBHEDRAL
Groundmass - CLINOPYROXENE ( 30%)
Morphology: ANHEDRAL
MAGNETITE ( 0.5%)
GLASS ( TR%)
INTERSTITIAL OPENINGS BETWEEN PLAG FILLED WITH
CPX+MAGN*
Alteration - CLAY MINERALS ( RARE%)
Replacing: GLASS
BROWN CLAY*
Vesicles -
Percent: RARE
Filling: CLAY.MINS
Leg : 45 Top/Bottom Interval(mm): 1310/1320 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 121.76 Rock Type: IGNEOUS
Core: 14 Sample Midpoint(m) : 123.08 Sect/Pc #: 1/PCE 9
ROCK = APHYRIC BASALT
SLIDE IS VERY SMALL AND THIN;
Texture: VARIOLITIC, APHYRIC*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): 0.2 Morphology: SUBHEDRAL
MICROPHENOS;
OLIVINE ( TR%)
Size(mm): 0.2 Morphology: SUBHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): 0.05 Morphology: ACICULAR
NO TWINNING SEEN DUE TO SMALL SIZE OF PLAG;
CLINOPYROXENE ( TR%)
Size(mm): 0.05
OLIVINE ( 10%)
Morphology: ACICULAR
GLASS ( 30%)
Leg : 45 Top/Bottom Interval(mm): 1120/1150 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 131.27 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 132.40 Sect/Pc #: 1/PCE 7D
ROCK = OL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PORPHYRITIC*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 2X0.5 Morphology: ANHEDRAL
XENOCRYST*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 1.5-0.2 Morphology: ACICULAR,SUBHEDRAL
CARLSBAD+ALBITE TWINS,2V80(+),AN95 IN CORE BY 2V,
COLORLESS,REMARKABLY ZONED,PLAG OBSERVED IN
MESOSTASIS;
CLINOPYROXENE ( 30%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL-ANHEDRAL
RADIAL AGGREGATES OF PLAG+ACICULAR CPX ARE SEEN,
PALE BROWN COLOR;
OLIVINE ( 5%)
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL-ANHEDRAL
SOME ELONGATED XTLS;
MAGNETITE ( 5%)
Size(mm): 0.04
ILMENITE
POSSIBLY OBSERVED IN MESOSTASIS*
Alteration - CLAY MINERALS (> %)
Location: MESOSTASIS
Leg : 45 Top/Bottom Interval(mm): 1120/1150 Describer: Zolotarev, B.
Hole: 395 Top of Core Depth(m) : 131.27 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 132.40 Sect/Pc #: 1/PCE 7D
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: INTERSERTAL-VARIOLITIC, PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 60%)
Size(mm): 0.7-1.5 Morphology: SUBHEDRAL,LATHS
APPROX COMP AN70;
CLINOPYROXENE ( 5%)
Size(mm): 0.5-1.0 Morphology: SUBHEDRAL
INTERSTITIAL OPENINGS BETWEEN PLAG+CPX FILLED WITH
DEVITRIFIED GLASS+MAGN;
OLIVINE ( TR%)
Size(mm): 0.2 Morphology: SUBHEDRAL
MICROPHENOS*
Groundmass - MAGNETITE ( 1.0%)
GLASS ( TR%)
DEVITRIFIED*
Leg : 45 Top/Bottom Interval(mm): 1300/1330 Describer: Prosser, E.
Hole: 395 Top of Core Depth(m) : 131.27 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 134.09 Sect/Pc #: 2/PCE 26
ROCK = OL MOD MICROPHYRIC BASALT;
Texture: VARIOLITIC,HOMOGENEOUS, MODERATELY MICROPHYRIC
RADIAL AGGREGATES OF PLAG(QUENCH XTLS) WITH
OL PHENOS,FINE-GRAINED,SUBOPHITIC*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.5 Morphology: SUBHEDRAL
MICROPHENOS,COLORLESS*
Groundmass - PLAGIOCLASE ( 40%)
Morphology: SUBHEDRAL
ALBITE TWINS,COLORLESS,APPROX COMP AN70-75;
CLINOPYROXENE ( 40%)
OPAQUE MINERALS ( 5%)
GREEN,INCLUDES MAGN+ILMENITE;
GLASS ( 10%)
Alteration - CLAY MINERALS
Location: VESICLES Replacing: GLASS
GREEN CLAY*
Vesicles -
Filling: CLAY.MIN
GREEN CLAY*
Leg : 45 Top/Bottom Interval(mm): 1090/1110 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 140.57 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 143.17 Sect/Pc #: 2/PCE 19
ROCK = OL MOD MICROPHYRIC BASALT;
Texture: MICROPORPHYRITIC*
Phenocrysts- OLIVINE ( <5%)
Size(mm): 0.1-0.5 Morphology: ANHEDRAL-SUBHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): 0.04X0.5 Morphology: SUBHEDRAL,ACICULAR
REMARKABLY ZONED,CARLSBAD+ALBITE TWINS,COLORLESS,
PARALLEL GROWTH OF PLAG+CPX,
SOME CONTAIN DEVITRIFIED GLASS,RADIAL AGGREGATES;
CLINOPYROXENE ( 30%)
Size(mm): 0.1 Morphology: ANHEDRAL
PALE BROWN;
OLIVINE ( <5%)
Size(mm): <0.1 Morphology: SUBHEDRAL-ANHEDRAL
2V 86(-),COMP FO75,COLORLESS;
MAGNETITE ( 5%)
Size(mm): 0.03
Alteration - CLAY MINERALS
SEEN AS MESOSTASIS WITH MAGN AND POSSIBLY
DEVITRIFIED GLASS*
Vesicles -
Size(mm): 0.2-1
Filling: CLAY.MIN
Leg : 45 Top/Bottom Interval(mm): 660/ 680 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 150.08 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 150.75 Sect/Pc #: 1/PCE 7
ROCK = GABBRO
ALTERED,RECRYSTALLIZED;
Texture: GRANULAR
SOME RELICT CPX AUGEN*
Phenocrysts- PLAGIOCLASE ( 40%)
ALMOST COMPLETELY ALTERED TO SERICITE+CHLORITE+
CLAY.MINS,TWINS ARE PRESERVED;
CLINOPYROXENE ( 50%)
RELICT CPX, HAS EXSOLUTION LAMELLAE,BENT, REPLACED
BY HORNBLENDE IN PATCHES(?);
CLINOPYROXENE ( 10%)
RECRYSTALLIZED,OFTEN REPLACED BY BROWN HORNBLENDE,
ALL COMPOSITIONS ARE AN ESTIMATE OF THE ORIGINAL
COMPOSITION*
Alteration - HORNBLENDE ( 1%)
Replacing: CPX
BROWN;
HORNBLENDE ( 1%)
GREEN;
SERICITE
Replacing: PLAG
CHLORITE
Replacing: PLAG
CLAY MINERALS
Replacing: PLAG
VEINLETS OF CLAY.MIN CUT CPX+ALTERED PLAG*
Leg : 45 Top/Bottom Interval(mm): 370/ 0 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 159.99 Sect/Pc #: 1/PCE 1
ROCK = PLAG-OL PHYRIC BASALT;
Texture: SUBOPHITIC, PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 35%)
Size(mm): 1-1.5 Morphology: EUHEDRAL
ALBITE+CARLSBAD TWINNING,AN80,COLORLESS,ZONED
REVERSED AND NORMAL TO AN70,CONTAIN ALTERATION
PATCHES OF FINE GRAINED,LOW BIREFRINGENT MATERIAL,
POSSIBLY ALTERED GLASS,OTHER PLAG XTLS CONTAIN
BROWN GLASS CENTERS;
OLIVINE ( 3%)
Size(mm): <1
CRACKED ALTERED AT MARGINS*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.3 Morphology: ACICULAR
ALBITE TWINS, COMP AN70 BY ALBITE METHOD;
CLINOPYROXENE ( 30%)
Size(mm): 0.2 Morphology: ANHEDRAL
2V 60,PLAG BROWN;
OLIVINE ( 2%)
Size(mm): 0.2 Morphology: ANHEDRAL
OPAQUE MINERALS ( 10%)
INCLUDES MAGN+ILMENITE;
GLASS
SOME ALTERED*
Alteration - SERPENTINITE ( TR%)
Replacing: OL
Vesicles -
Percent: TR
PALE BROWN FILLING*
Leg : 45 Top/Bottom Interval(mm): 540/ 560 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 160.17 Sect/Pc #: 1/PCE 2B
ROCK = SERPENTINIZED HARZBURGITE
30% SERPENTINIZATION;
Phenocrysts- CLINOPYROXENE ( <2%)
MORE BROWNISH THAN OPX;
OLIVINE ( 60%)
2V90, COMP FO90 BY 2V METHOD;
ORTHOPYROXENE ( 35%)
Size(mm): 3X3-5X10
2V 80(+),COMP EN80 BY 2V, VERY PALE BROWN*
Groundmass - MAGNETITE ( 1%)
SPINEL ( <1%)
Morphology: INTERSTITIAL
PICOTITE,REDDISH BROWN*
Alteration - SERPENTINITE
Leg : 45 Top/Bottom Interval(mm): 560/ 580 Describer: Zolotarev, B.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 160.19 Sect/Pc #: 1/PCE 2B
ROCK = SERPENTINIZED PERIDOTITE;
Texture: MESH-LIKE*
Phenocrysts- CLINOPYROXENE ( TR%)
Morphology: SUBHEDRAL
OLIVINE ( 40%)
Morphology: ANHEDRAL
OL RIMMED WITH SERP, SOMETIMES CHROMITE;
ORTHOPYROXENE ( 30%)
Morphology: SUBHEDRAL
Groundmass - MAGNETITE ( TR%)
CHROMITE (.1-.5%)
FOUND ON OLIVINE RIMS*
Alteration - SERPENTINITE ( 30%)
Replacing: OL
Leg : 45 Top/Bottom Interval(mm): 680/ 700 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 160.31 Sect/Pc #: 1/PCE 2C
ROCK = SERPENTINIZED HARZBURGITE
15% SERPENTINIZATION,PARALLEL THIN SECTION;
Phenocrysts- CLINOPYROXENE ( <5%)
Size(mm): 3-5
OLIVINE ( 45%)
2V90,COMP FO90 BY 2V;
ORTHOPYROXENE ( 50%)
Size(mm): 10X10
10X10MM MAX,2V80, COMP EN90 BY 2V,VERY PALE BROWN*
Groundmass - MAGNETITE ( 1%)
Alteration - SMECTITE ( TR%)
SERPENTINITE
Leg : 45 Top/Bottom Interval(mm): 680/ 701 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 160.31 Sect/Pc #: 1/PCE 2C
ROCK = SERPENTINIZED HARZBURGITE
PERPENDICULAR THIN SECTION;
Phenocrysts- CLINOPYROXENE ( 1%)
OLIVINE ( 40%)
2V 90, COMP FO90;
ORTHOPYROXENE ( 60%)
2V 80, COMP EN90*
Groundmass - MAGNETITE ( 1%)
CALCITE ( TR%)
IN VEIN WITH MAGN*
Alteration - SERPENTINITE
Leg : 45 Top/Bottom Interval(mm): 830/ 850 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 160.46 Sect/Pc #: 1/PCE 2E
ROCK = SERPENTINIZED HARZBURGITE
SERPENTINIZATION 20%,PERPENDICULAR THIN SECTION;
Phenocrysts- CLINOPYROXENE ( TR%)
OLIVINE ( 50%)
2V 90, COMP FO90 BY 2V;
ORTHOPYROXENE ( 50%)
2V 80(+), COMP EN90 BY 2V,VERY PALE BROWN,
CONTAINS EXSOLUTION XTLS OF CPX*
Groundmass - MAGNETITE ( 10%)
MAGN GRAINS IN SERP AND CALCITE GRAINS;
Alteration - SERPENTINITE ( 20%)
CALCITE ( TR%)
Location: VEIN
Leg : 45 Top/Bottom Interval(mm): 980/1000 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 160.61 Sect/Pc #: 1/PCE 2E
ROCK = SERPENTINIZED HARZBURGITE
SERPENTINIZATION 30-40%;
Phenocrysts- CLINOPYROXENE ( TR%)
OLIVINE ( 60%)
COMP FO90 BY A 2V OF 90;
ORTHOPYROXENE ( 40%)
COMP EN90 BY A 2V OF 80(+),VERY PALE BROWN*
Groundmass - MAGNETITE ( <1%)
OPAQUE;
SPINEL ( <1%)
PICOTITE,GOLDEN BROWN*
Alteration - SERPENTINITE
Leg : 45 Top/Bottom Interval(mm): 220/ 250 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: UNIDENTIFIED
Core: 18 Sample Midpoint(m) : 161.36 Sect/Pc #: 2/PCE 4
ROCK = BRECCIA
SEDIMENTARY,CONTAINS ANGULAR FRAGMENTS OF SERP
AND PLAG+PYX XTLS; OPX EXSOLVES TO CPX,FRAGMENTS
FROM 0.04 UPWARD TO 74MM, CARBONATE MATRIX;
Groundmass - PLAGIOCLASE ( 5%)
CLINOPYROXENE ( 5%)
MAGNETITE ( TR%)
CALCITE ( 70%)
MATRIX;
SERPENTINITE ( 20%)
CHROMITE ( TR%)
Size(mm): TO 0.5
Leg : 45 Top/Bottom Interval(mm): 370/ 380 Describer: Prosser, E.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 161.50 Sect/Pc #: 2/PCE 7
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: GLOMEROPORPHYRITIC, PORPHYRITIC
OF PLAG+OL+CPX(RARE),DEVITRIFIED GLASS;
Where sampled: BRECCIA ZONE*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): 1.5-3 Morphology: EUHEDRAL
CARLSBAD-ALBITE TWINS,COMP AN70-75 BY AB METHOD,
COLORLESS;
CLINOPYROXENE ( 1-2%)
PALE YELLOW;
OLIVINE ( 15%)
Size(mm): 1.5-3 Morphology: SUBHEDRAL
GREEN,COLORLESS,SOME SURROUNDED BY PLAG AND VICE
VERSA,PERHAPS COTECTIC XTLIZATION*
Groundmass - PLAGIOCLASE
CLINOPYROXENE
SUBMICROSCOPIC NEEDLES OF PLAG+CPX,GROUNDMASS
TOTALS ABOUT 50%;
MAGNETITE ( 1-2%)
ILMENITE ( TR%)
Vesicles -
Percent: <1
Filling: OL
Leg : 45 Top/Bottom Interval(mm): 900/ 920 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 159.62 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 162.03 Sect/Pc #: 2/PCE 17A
ROCK = SERPENTINIZED PERIDOTITE
35-40% SERPENTINIZATION;
Phenocrysts- CLINOPYROXENE ( 5%)
Size(mm): TO 5
2V 45(+);
OLIVINE ( 60%)
2V 90, COMP FO90;
ORTHOPYROXENE ( 35%)
Size(mm): TO 6
2V 80,COMP EN90, CPX+OPX CONTAIN EXSOLUTION
LAMELLAE OR BLEBS,SHOW WAVY EXTINCTION PROBABLY
DUE TO SHEARING*
SPINEL ( 1%)
Size(mm): 3
PICOTITE, REDDISH BROWN*
Leg : 45 Top/Bottom Interval(mm): 360/ 380 Describer: Prosser, E.
Hole: 395 Top of Core Depth(m) : 169.15 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 169.52 Sect/Pc #: 1/PCE 4
ROCK = PLAG-CPX PHYRIC BASALT;
Texture: PORPHYRITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 40%)
Size(mm): 1-5 Morphology: EUHEDRAL
COMP AN25 IN CORE BY ALBITE METHOD,ALBITE+CARLSBAD
TWINS,COLORLESS,ZONED, CRYSTALLIZATION SEQUENCE:
1).PLAG-0(CORES OF PHENOS,PERHAPS XENOCRYSTS)
2).PLAG-1(PARTLY RIM OF PLAG-0,ALSO INDIVIDUALS)
AND CPX, 3).PLAG-2(OUTER RIM OF PLAG PHENOS) PLUS
GROUNDMASS CPX AND OL(?);
CLINOPYROXENE ( 10%)
Size(mm): TO 0.5 Morphology: EUHEDRAL-SUBHEDRAL
PARTLY SECTOR ZONED, PALE GREEN TO GRAY,
MICROPHENOS;
OLIVINE ( TR%)
Morphology: ANHEDRAL
HIGHLY ALTERED*
Groundmass - OPAQUE MINERALS ( 5%)
INCLUDES MAGN+ILMENITE*
Alteration - CLAY MINERALS
Location: VESICLES
Vesicles -
Filling: CLAY.MIN
NO ABUNDANCE GIVEN*
Leg : 45 Top/Bottom Interval(mm): 790/ 0 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 169.15 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 169.94 Sect/Pc #: 1/PCE 9
ROCK = PLAG-CPX-OL MICROPHYRIC BASALT;
Texture: MICROPORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): TO 5 Morphology: EUHEDRAL-SUBHEDRAL
CARLSBAD+ALBITE TWINS,INTENSE ZONING ON THE
MARGINS,CONTAINS ALTERED GLASS,HOMOGENEOUS INNER
PART IS ROUNDED, PLAG MAY BE XENOCRYSTS;
PLAGIOCLASE ( 25%)
Size(mm): 0.7 Morphology: EUHEDRAL-SUBHEDRAL
CARLSBAD+ALBITE TWINS,MICROPHENOS;
CLINOPYROXENE ( 5%)
Size(mm): 0.3 Morphology: EUHEDRAL
HOURGLASS STRUCTURE, MICROPHENOS;
OLIVINE ( 5%)
Size(mm): 0.3 Morphology: EUHEDRAL
MICROPHENOS*
Groundmass - PLAGIOCLASE
Morphology: MICROLITES
CLINOPYROXENE
Morphology: MICROLITES
MAGNETITE ( 10%)
TOTAL OF GROUNDMASS IS 35%*
Alteration - CLAY MINERALS
Location: VESICLES
Vesicles -
Percent: 2
Filling: CLAY.MIN
BROWN CLAY*
Leg : 45 Top/Bottom Interval(mm): 1440/1460 Describer: Fujioka, K.
Hole: 395 Top of Core Depth(m) : 169.15 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 170.60 Sect/Pc #: 1/PCE 17
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,MEDIUM-GRAINED BASALTIC GROUNDMASS
GROUNDMASS IS CHARACTERIZED BY
MICRODOLERITIC TEXTURE (SUBOPHITIC)*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 3X2 Morphology: SUBHEDRAL
PLAGIOCLASE ( 25%)
Size(mm): 0.4X2 Morphology: EUHEDRAL-SUBHEDRAL
INNER PART OF PHENOCRYSTIC PLAG IS ROUNDED SHAPE
AND THIS MAY BE XENOCRYST;
CLINOPYROXENE ( 5%)
Size(mm): 0.4 Morphology: SUBHEDRAL-ANHEDRAL
MICROPHENOS,PALE BROWN;
OLIVINE ( <5%)
Size(mm): 0.4 Morphology: SUBHEDRAL
2V 85,COMP FO80,SOME SURROUNDED BY CLAY*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.1 Morphology: SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.1 Morphology: ANHEDRAL
OLIVINE ( <1%)
COMPLETELY ALTERED,ID UNCERTAIN;
MAGNETITE ( 5%)
CONCENTRATED IN MESOSTASIS*
Alteration - CLAY MINERALS
Location: VESICLES
Vesicles -
Size(mm): 0.5-1.5
Filling: CLAY.MIN
GREEN-BROWN CLAY, ONE VESICLE FILLED WITH BASALT*
Leg : 45 Top/Bottom Interval(mm): 320/ 360 Describer: Graham, A.
Hole: 395 Top of Core Depth(m) : 178.65 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 178.99 Sect/Pc #: 1/PCE 5
ROCK = PLAG-OL PHYRIC BASALT;
Texture: MEDIUM-GRAINED,PORPHYRITIC
BASALTIC WITH FELDSPAR PHENOS*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): TO 2.5
ALBITE+CARLSBAD TWINS, COMP OF AN70 BY ALBITE,
2V90,CONTAIN ROUNDED INCLUSIONS OF BROWN MATERIAL,
ROUNDED AGGREGATES,WITH NORMAL+OSCILLATORY ZONING*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.3-0.6 Morphology: ACICULAR
CARLSBAD+ALBITE TWINS,COMP AN60 BY ALBITE METHOD;
CLINOPYROXENE ( 20%)
Size(mm): 0.2-0.05 Morphology: EUHEDRAL
LARGE 2V;
OLIVINE ( 10%)
Size(mm): 0.1-0.4 Morphology: ANHEDRAL
MG-RICH,2V 90,WITH BROWN ALTERATION PRODUCT AND
SOMETIMES CALCITE;
OPAQUE MINERALS ( 8%)
Size(mm): 0.05 Morphology: ROUNDED
INCLUDES MAGN+ ILMENITE*
Alteration - PALAGONITE
CLAY MINERALS
Replacing: OL
IDDINGSITE
Replacing: OL
CARBONATE
Replacing: OL
FERROUS HYDROX MINS
ARAGONITE
Replacing: OL
2V- = 15*
Vesicles -
Percent: <1
ABUNDANCE OF VESICLE+PALAGONITE+CLAY IS 1*
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