Leg : 84 Top/Bottom Interval(mm): 400/ 410 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 253.10 Rock Type: METAMORPHIC
Core: 7 Sample Midpoint(m) : 255.01 Sect/Pc #: 2/
ROCK = SERPENTINITE;
Texture: SERPENTINITE MESH, RIBBON
TEXTURE EXHIBITS ONLY SMALL SHEARING RATE, SOME
TRACES OF MANTLE TEXTURE PRESERVED, ORIGINAL
ROCK MINERALS 100 PERCENT ALTERED;
Where sampled: SERPENTINITE CLAST*
Phenocrysts- ORTHOPYROXENE ( 5%)
Size(mm): 1 Morphology: IDIOMORPHIC
PSEUDOMORPH LIZARDITE (BASTITE), PRESERVED MANTLE
TEXTURES*
Groundmass - MAGNETITE ( 15%)
Size(mm): SCATTERED
ID UNCERTAIN, NEW FORMED, BYPRODUCT OF SERP;
Alteration - SERPENTINITE ( 80%)
YOUNGER CROSS-CUTTING CHRYSOTILE VEINS, POSSIBLY
REPLACING OL+PYX+OPX, COMPLETE REPLACING OF ROCK,
NEW TEXTURE*
Leg : 84 Top/Bottom Interval(mm): 0/ 0 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 280.70 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 282.20 Sect/Pc #: 2/
ROCK = PLAG PHYRIC BASALT
ID UNCERTAIN;
Texture: GLOMEROPHYRIC;
Where sampled: CLAST IN CONGLOMERATE SLUMP MASSES*
Phenocrysts- PLAGIOCLASE ( 40%)
Size(mm): 0.2-3 Morphology: SUBHEDRAL
STRONGLY ALTERED;
CLINOPYROXENE ( TR%)
ID UNCERTAIN*
Groundmass - GLASS ( 60%)
100 PERCENT ALTERED TO CLAY+OP.MINS, INCLUDED
MAGN+HEMATITE+CLAY+CALCITE+CHLORITE+PREHNITE*
Alteration - COMBINATION ( 70%)
INCLUDES CARB+CLAYS+ZEOLITES+OTHERS*
Leg : 84 Top/Bottom Interval(mm): 1150/1160 Describer: Ogawa, Y.
Hole: 567A Top of Core Depth(m) : 280.70 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 283.36 Sect/Pc #: 2/
ROCK = BASALTIC ANDESITE
CONSIDERABLY ALTERED, MAY BE LAVA XENOLITH FROM
CONTINENTAL VOLCANO, PEBBLE 80MM*
Phenocrysts- PLAGIOCLASE
LABRADORITE*
Groundmass - CLINOPYROXENE
MOSTLY ALTERED TO CLAY.MINS, ID OF CLAY.MINS
UNCERTAIN, MAX EXTINCTION ANGLE 37;
PLAGIOCLASE
ANDESITE, MAX EXTINCTION ANGLE 23;
OPAQUE MINERALS ( 30%)
RICH IN THESE MINERALS*
Alteration - CLAY
Replacing: CPX
CPX IS MOSTLY ALTERED TO UNIDENT CLAY.MINS*
Leg : 84 Top/Bottom Interval(mm): 460/ 480 Describer: Ogawa, Y.
Hole: 567A Top of Core Depth(m) : 307.30 Rock Type: SEDIMENTARY
Core: 13 Sample Midpoint(m) : 309.27 Sect/Pc #: 2/
ROCK = SANDSTONE
EQUIGRANULAR, ROUNDED TO SUBROUNDED INCLUDING SOME
ANGULAR ONES, WELL-SORTED, AVERAGE .1MM, CALCITE
CEMENTED QUARTZ-FELDSPAR COMMON LITHIC SANDSTONE,
CALCITE CEMENT EXCEED 20 PERCENT, GRAINS ARE MORE
OR LESS ALTERED TO CLAY.MINS AND REPLACED BY
CALCITE, FELDSPARS ARE MOSTLY PLAG ANDESINE TO
LABRADORITE, A FEW ALKALI-FELDSPARS INCLUDED,
FELDSPAR AND QUARTZ HAVE WAVY EXTINCITON, HEAVY
MINERALS ARE GREEN-BROWN HORNBLENDE+CPX+ZIRCON,
GLAUCONITE COMMON, A FEW DISTINCT SERPENTINE
INCLUDED, LITHIC FRAGMENTS ARE NOT CRITICALLY
EXAMINED BUT MOST ARE VOLCANIC, ID UNCERTAIN,
Q-F-R CONTENT IS ESTIMATED 10-20-70*
Leg : 84 Top/Bottom Interval(mm): 1370/ 0 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 316.20 Rock Type: METAMORPHIC
Core: 14 Sample Midpoint(m) : 319.07 Sect/Pc #: 2/
ROCK = SERPENTINITE
BAD THIN SECTION;
Where sampled: FROM MASSIVE SERPENTINITE CORE*
Phenocrysts- PLAGIOCLASE ( 0%)
SPINEL ( 3%)
CHROMITE;
ORTHOPYROXENE ( 10%)
Size(mm): 1-2
WEATHERED SERPENTINITE*
Alteration - CARBONATE ( 5%)
SERPENTINITE ( 77%)
TALC ( 5%)
Leg : 84 Top/Bottom Interval(mm): 1420/1450 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 316.20 Rock Type: METAMORPHIC
Core: 14 Sample Midpoint(m) : 319.14 Sect/Pc #: 2/
ROCK = SERPENTINITE;
Texture: BASTITE STRUCTURE*
Phenocrysts- ORTHOPYROXENE ( 70%)
Size(mm): 0.5-3 Morphology: EUHEDRAL TO SUBHEDRAL
ID UNCERTAIN, COMPLETELY ALTERED TO BASTITES, SHOW
STRONG SHEARING,
MANTLE OPX THEN STRONG SHEARING PORPHYROCLASTIC,
ALSO PLATY SERPENTINITE RECRYSTALLIZATION,
METAMORPHIC SERPENTINITE*
CHROMITE ( 3%)
Size(mm): 1 Morphology: EUHEDRAL TO SUBHEDRAL
STONGLY ALTERED*
Groundmass - MAGNETITE ( 5%)
REPLACING PART CHROMITE AND/OR FROM
SERPENTINIZATION*
Alteration - TALC ( 10%)
Location: ONLY IN VEINS
SERPENTINITE ( 12%)
Location: SERP MESH
POSSIBLY REPLACING OL, METASOMATIC BUT FROM ROCK
ITSELF*
Leg : 84 Top/Bottom Interval(mm): 0/ 0 Describer: Bellon, H.
Hole: 567A Top of Core Depth(m) : 358.70 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 360.10 Sect/Pc #: CC/
ROCK = OL-CPX PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: PHYRIC, MICROLITIC GROUNDMASS*
Phenocrysts- OLIVINE
ALTERED;
CLINOPYROXENE
FRESH, CALCIC*
Groundmass - PLAGIOCLASE
CLINOPYROXENE
TITANOMAGNETITE
GLASS
RESIDUAL, ALTERED*
Alteration - CHLORITE
Replacing: GLASS
CALCITE
Replacing: GLASS
Leg : 84 Top/Bottom Interval(mm): 0/ 0 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 358.70 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 360.10 Sect/Pc #: CC/
ROCK = DOLERITE;
Texture: OPHITIC;
Where sampled: CLAST IN CORE CATCHER*
Phenocrysts- PLAGIOCLASE ( 60%)
Size(mm): 0.1-0.5 Morphology: LATHS
ALTERED;
SPINEL ( 3%)
Size(mm): 0.2-0.3
Groundmass - CLINOPYROXENE ( 20%)
Size(mm): 0.2-0.4 Morphology: ANHEDRAL
APPROX COMP DIOPSIDIC PYROXENE, FILLING OF PLAG
MESH;
QUARTZ ( 10%)
Morphology: ANHEDRAL
POSSIBLY SECONDARY*
Alteration - CARBONATE ( 3%)
Location: SCATTERED Replacing: EVERY OTHER MINERAL
CLAY ( 4%)
Location: SCATTERED Replacing: EVERY OTHER MINERAL
Leg : 84 Top/Bottom Interval(mm): 990/1010 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 376.40 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 377.40 Sect/Pc #: 1/PCE 1
ROCK = GABBRO
META-GABBRO POSSIBLY;
Texture: HYPIDIOMORPHIC, GRANULAR;
Where sampled: SAMPLE CORED FROM GABBRO VEIN*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.4 Morphology: EUHEDRAL
APPROX COMP BASIC, ALMOST COMPLETELY ALTERED;
CLINOPYROXENE ( 10%)
Size(mm): 0.3-0.8 Morphology: EUHEDRAL
APPROX COMP AUGITE, ALMOST COMPLETELY ALTERED,
ACTINOLITE+TREMOLITE, ACTINOLITE EXHIBITS
PORPHYROCLASTIC TEXTURES WHEN DEFORMED*
Groundmass - CHALCEDONY ( TR%)
SECONDARY*
Alteration - CARBONATE ( 2%)
Location: VEINS, Replacing: GROUNDMASS
Location: GROUNDMASS
CLAY ( 42%)
Location: GROUNDMASS
MORE OR LESS OPAQUE;
ZEOLITE ( 1%)
OPAQUE, SECONDARY;
OTHER ( 25%)
EUHEDRAL XTLS, POSSIBLY REPLACING OPX ALSO,
PARTLY TREMOLITE*
Leg : 84 Top/Bottom Interval(mm): 1130/1150 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 376.40 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 377.54 Sect/Pc #: 1/PCE 2
ROCK = GABBRO
THIN SECTION IS BAD;
Texture: HYPIDIOMORPHIC-GRANULAR;
Where sampled: CORE DRILLED FROM GABBRO SHEET*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): TO 5 Morphology: HYPIDIOMORPHIC
APPROX COMP BASIC, STRONGLY ALTERED;
CLINOPYROXENE ( 10%)
Groundmass - QUARTZ ( 10%)
FILLS SECONDARY VEINS*
Alteration - CHLORITE ( 10%)
Location: IN UNSHEAVED Replacing: PLAG,CPX
Location: VEINS
COMBINATION ( 15%)
INCLUDES CLAY+ZEOLITES;
ACTINOLITE ( 25%)
Location: SCATTERED IN Replacing: CPX
Location: GROUNDMASS
GREENSCHIST METAMOPHOSED GABBRO*
Leg : 84 Top/Bottom Interval(mm): 1130/1150 Describer: Ogawa, Y.
Hole: 567A Top of Core Depth(m) : 376.40 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 377.54 Sect/Pc #: 1/PCE 2
ROCK = META-GABBRO;
Texture: ALLOTRIOMORPHIC-GRANULAR
FRACTURE, GRANULIZATION COMMON;
Phenocrysts- PLAGIOCLASE ( 55%)
Size(mm): 1 Morphology: GRANULAR
CLINOPYROXENE ( 15%)
Size(mm): 0.5 Morphology: GRANULAR
ORTHOPYROXENE ( 30%)
Size(mm): 0.8 Morphology: GRANULAR
NOW ACTINOLITE*
Alteration - CARBONATE ( 2%)
Location: SPOTS Replacing: PLAG
STRONG ALTERATION;
CLAY ( 10%)
Replacing: OPX,CPX
STRONG ALTERATION, IN GENERAL GREENSCHIST FACIES
ALTERATION, METAMORPHISM*
Leg : 84 Top/Bottom Interval(mm): 1400/1420 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 376.40 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 377.81 Sect/Pc #: 1/PCE 8
ROCK = DOLERITE
DIABASE, UNCERTAIN ABOUT SAMPLE DEPTH;
Texture: OPHITIC, MICROLITIC;
Where sampled: SAMPLE CORED FROM IGNEOUS*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): 0.15 Morphology: RADIATING, NEEDLE-LIKE
APPROX COMP ALBITE, ALTERATION OF BASE PLAG*
Groundmass - QUARTZ ( 5%)
FOUND IN VEINS AND SCATTERED IN GROUNDMASS*
Alteration - CLAY ( 40%)
Replacing: GROUNDMASS
ZEOLITE ( 5%)
ACTINOLITE ( 25%)
Replacing: CPX
1MM LARGE XTLS SCATTERED IN GROUNDMASS, CPX ID
UNCERTAIN*
Leg : 84 Top/Bottom Interval(mm): 1450/ Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 376.40 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 377.85 Sect/Pc #: 1/PCE 9
ROCK = GABBRO
Texture: HYPIDIOMORPHIC GRANULAR
UNCERTAIN ABOUT SAMPLE DEPTH;
DEEPER IN OPHIOLITIC SECTION REPLACED GABBRO BUT
NO OL OR CHROMITE;
Where sampled: SAMPLE FROM GABBRO SECTION CORED*
Phenocrysts- PLAGIOCLASE ( 50%)
Size(mm): 0.4-1 Morphology: SUBHEDRAL LATHS
APPROX COMP LABRADORITE;
CLINOPYROXENE ( 5%)
Size(mm): 0.2-0.6 Morphology: SUBHEDRAL
APPROX COMP AUGITE+UNCERTAIN MINERAL;
Alteration - CARBONATE ( TR%)
CLAY MINERALS ( 5%)
CHLORITE ( 10%)
Replacing: PLAG, CPX
ACTINOLITE ( 30%)
Replacing: CPX
ALTERATION IN TYPICAL GREENSCHIST FACIES FOR
MOST MINERALS*
Leg : 84 Top/Bottom Interval(mm): 130/ 150 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 394.10 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 394.24 Sect/Pc #: CC/
ROCK = GABBRO;
Texture: HYPIDIOMORPHIC-GRANULAR
VERY HIGHLY ALTERED GABBRO,GREENSCHIST, PERHAPS
RODINGITISED;
Where sampled: CLAST FROM GABBRO SLAB*
Phenocrysts- PLAGIOCLASE ( 30%)
Size(mm): TO 2
MOD-HIGH ALTERATION, ALTERED TO CHLORITE+ACTINOL,
APPROX COMP BASIC;
CLINOPYROXENE ( 5%)
Alteration - CARBONATE ( 10%)
Location: VEINS
OTHER ( 5%)
Replacing: PLAG, CPX
HYDRO GARNET, HYDROG ALTERED;
CHLORITE ( 20%)
ACTINOLITE ( 30%)
Leg : 84 Top/Bottom Interval(mm): 0/ 20 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 402.90 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 402.91 Sect/Pc #: CC/
ROCK = BASALT
ID UNCERTAIN;
Texture: VARIOLITIC
NO PRESERVED PHENOCRYSTS TO OBSERVE;
Where sampled: CORE OF GABBRO-DOLERITE*
Alteration - CARBONATE ( 10%)
OPAQUE MINERALS ( 10%)
ZEOLITE ( 10%)
PREHNITE ( 50%)
ID UNCERTAIN;
COMBINATION ( 20%)
INCLUDES CLAY+CHLORITE, ALL LOW GRADE GREENSCHIST
ALTERATION*
Leg : 84 Top/Bottom Interval(mm): 0/ 20 Describer: Ogawa, Y.
Hole: 567A Top of Core Depth(m) : 402.90 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 402.91 Sect/Pc #: CC/
ROCK = SERPENTINITE
ORIGINALLY HARZBURGITE, MOST MINERALS ARE
SERPENTINIZED, ORIGINAL MINERAL COMP OL-OPX
80-20;
Texture: EQUIGRANULAR*
Groundmass - OLIVINE ( 60%)
CLINOPYROXENE ( 25%)
OL AND CPX ALTERED TO SERP;
OPAQUE MINERAL ( 15%)
MOST MINERALS ARE SERPENTINIZED*
Leg : 84 Top/Bottom Interval(mm): 310/ 320 Describer: Helm, R.
Hole: 567A Top of Core Depth(m) : 411.80 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 412.53 Sect/Pc #: CC/
ROCK = GABBRO
SAMPLE NOT USABLE*
Leg : 84 Top/Bottom Interval(mm): 370/ 400 Describer: Ogawa, Y.
Hole: 567A Top of Core Depth(m) : 429.60 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 429.99 Sect/Pc #: 1/PCE 4
ROCK = BASALT
BASALTIC LAVA COVERED BY BASALTIC SHALE CONTAINING
SOME CLASTS AND RADIOLARIAN TESTS, CHERT ANGULAR
FRAGMENTS ARE INCLUDED;
Texture: INTERSERTAL;
Phenocrysts- PLAGIOCLASE ( 40%)
Size(mm): 0.3 Morphology: LATH
APPROX COMP BASIC, INTERSERTAL, PLAG LATHS ARE
ARRANGED TRACHYTIC TEXTURE BUT MOST ARE CURVED;
CLINOPYROXENE ( 30%)
Size(mm): 0.2
APPROX COMP AUGITE*
Groundmass - CLINOPYROXENE ( 10%)
Size(mm): 0.05
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Size(mm): 0.1
GLASS ( 10%)
ALTERED BY CALCITE*
Alteration - CARBONATE
REPLACES GLASS AND PART OF PLAG, ONE PARTICULAR
VEIN REMARKABLE*
Leg : 84 Top/Bottom Interval(mm): 900/ 960 Describer: Bellon, H.
Hole: 567A Top of Core Depth(m) : 429.60 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 432.03 Sect/Pc #: 2/
ROCK = DOLERITE
SOURCE IS INITIAL REPORTS;
Texture: COARSE-GRAINED*
Phenocrysts- OLIVINE
ALTERED;
CLINOPYROXENE
FRESH;
PLAGIOCLASE
FRESH*
Groundmass - PLAGIOCLASE
CLINOPYROXENE
TITANOMAGNETITE
HEMOIL
Alteration - CHLORITE
CALCITE
Leg : 84 Top/Bottom Interval(mm): 740/ 780 Describer: Bellon, H.
Hole: 567A Top of Core Depth(m) : 429.60 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 433.36 Sect/Pc #: 3/
ROCK = DOLERITE
SOURCE IS INITIAL REPORTS;
Texture: COARSE-GRAINED*
Phenocrysts- OLIVINE
ALTERED;
CLINOPYROXENE
FRESH;
PLAGIOCLASE
FRESH*
Groundmass - PLAGIOCLASE
CLINOPYROXENE
TITANOMAGNETITE
HEMOIL
Alteration - CHLORITE
CALCITE
Leg : 84 Top/Bottom Interval(mm): 30/ 40 Describer: Bellon, H.
Hole: 567A Top of Core Depth(m) : 438.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 438.54 Sect/Pc #: 1/PCE 1
ROCK = PLAG-CPX MICROPHYRIC BASALT TO DOLERITE
SOURCE IS INITIAL REPORTS;
Texture: MICROPHYRIC TO FINE-GRAINED
SHOWS PROGRESSIVE TRANSITION FROM TEXTURE MADE OF
SKELETAL MICROLITES OF PLAG AND CPX TO ONE
COMPOSED OF A FINE-GRAINED DOLERITIC TEXTURE;
Phenocrysts- OLIVINE
ALTERED;
CLINOPYROXENE
FRESH;
PLAGIOCLASE
FRESH*
Groundmass - PLAGIOCLASE
CLINOPYROXENE
TITANOMAGNETITE
HEMOIL
ALBITE
Alteration - CHLORITE
CALCITE
CELADONITE
Location: GROUNDMASS
Leg : 84 Top/Bottom Interval(mm): 1100/ 0 Describer: Baltuck, M.
Hole: 567A Top of Core Depth(m) : 438.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 439.60 Sect/Pc #: 1/PCE 15
ROCK = GABBRO;
Texture: OPHITIC;
Where sampled: DRILLED SAMPLE FROM GABBRO*
Phenocrysts- PLAGIOCLASE ( 50%)
STRONGLY ALTERED;
CLINOPYROXENE ( 15%)
MODERATELY ALTERED*
Alteration - CARBONATE ( 5%)
COMBINATION ( 10%)
INCLUDES CLAY/CHLORITE;
OPAQUE MINERALS ( 5%)
ACTINOLITE ( 15%)
Location: SP IN VEINS Replacing: CPX,PLAG
ALL STRONGLY GREENSCHIST ALTERED*
Leg : 84 Top/Bottom Interval(mm): 1400/1420 Describer: Bloomer, S.
Hole: 567A Top of Core Depth(m) : 484.60 Rock Type: METAMORPHIC
Core: 29 Sample Midpoint(m) : 487.51 Sect/Pc #: 2/
ROCK = SERPENTINITE
SOURCE IS INITIAL REPORTS*
Groundmass - SERPENTINITE ( 90.7%)
OPAQUE MINERALS
ABUNDANT OPAQUES, INCLUDED WITH SERPENTINE;
BASTITE ( 8.8%)
OLIVINE ( 0.0%)
ORTHOPYROXENE ( 0.0%)
SPINEL ( 0.3%)
CLINOPYROXENE ( 0.0%)
OTHER ( 0.2%)
EXSOLUTION IN BASTITE*
Leg : 84 Top/Bottom Interval(mm): 1470/1490 Describer: Bellon, H.
Hole: 567A Top of Core Depth(m) : 484.60 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 487.58 Sect/Pc #: 2/
ROCK = BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCHED*
Phenocrysts- OLIVINE
ALTERED;
CLINOPYROXENE
FRESH;
PLAGIOCLASE
FRESH*
Groundmass - PLAGIOCLASE
CLINOPYROXENE
TITANOMAGNETITE
HEMOIL
Alteration - CHLORITE
CALCITE
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