Leg : 65 Top/Bottom Interval(mm): 820/ 830 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 145.50 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 149.33 Sect/Pc #: 3/PCE 1B
ROCK = OL SPARSELY PHYRIC BASALT;
Texture: SPARSELY PORPHYRITIC,FINE- TO MEDIUM GRAINED,
INTERGRANULAR-INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( TR%)
Size(mm): TO 2 Morphology: ANHEDRAL
FRESH,ZONED;
OLIVINE ( 2%)
Size(mm): TO 1 Morphology: SUBHEDRAL
MOSTLY FRESH,SOME ALTERATION TO SMEC,2V=90*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.5-0.8 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 5%)
Size(mm): 0.1-0.2 Morphology: ANHEDRAL
MOSTLY FRESH WITH SOME ALTERATION TO SMEC;
CLINOPYROXENE ( 45%)
Size(mm): 0.2-0.5 Morphology: ACICULAR
FRESH,2VZ=40;
OPAQUE MINERALS ( 2%)
Size(mm): 0.05-0.1 Morphology: SUBHEDRAL
MICROCRYST GROUNDMASS ( 2-3%)
INTERSTITIAL MATERIAL,REPLACED BY SMEC*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
OL + INTERSTITIAL MATERIAL PARTLY REPLACED BY
SMEC;
CARBONATE
Location: VESICLES
Vesicles -
Size(mm): 0.5
Percent: TR
Filling: CARB
Shape: ROUND-
Shape: IRREGULAR
Leg : 65 Top/Bottom Interval(mm): 620/ 640 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 155.00 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 155.63 Sect/Pc #: 1/PCE 4A
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH*
Phenocrysts- PLAGIOCLASE ( 8-10%)
Size(mm): 0.6-1 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 2-3%)
Size(mm): 0.4-0.6 Morphology: SUBHEDRAL
MOSTLY ALTERED TO SMEC;
CLINOPYROXENE ( 2%)
Size(mm): 0.3-0.5 Morphology: ANHEDRAL
FRESH,2VZ=40,ALL PHENOS (PLAG + OL + CPX) ARE
TYPICALLY INTERGROWN IN GLOMEROPHYRIC CLUSTERS*
Groundmass - GLASS
DARK BROWN,PARTLY DEVITRIFIED;
PLAGIOCLASE
SPARSE XTLS;
MAGNETITE
SPARSE XTLS*
Alteration - SMECTITE
Replacing: OL
OL PARTLY REPLACED BY SMEC*
Leg : 65 Top/Bottom Interval(mm): 1030/1050 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 158.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 159.04 Sect/Pc #: 1/PCE 2H
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-GRAINED,INTERGRANULAR-
INTERSERTAL*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.5-1 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 1-2%)
Size(mm): 0.5 Morphology: SUBHEDRAL
PARTLY REPLACED BY SMEC;
CLINOPYROXENE ( 40%)
Size(mm): 0.3-0.5 Morphology: SUBHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 2-3%)
Size(mm): 0.1-0.3 Morphology: SUBHEDRAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5%)
INTERSTITIAL MATERIAL,BROWN,FRESH*
Alteration - SMECTITE
Replacing: OL
OL PARTLY REPLACED BY SMEC;
CARBONATE
Location: VEINS
SPARSE VEINS (0.2 MM WIDE) FILLED WITH CARB*
Leg : 65 Top/Bottom Interval(mm): 1120/1140 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 180.50 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 181.63 Sect/Pc #: 1/PCE 6C
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM- TO COARSE-GRAINED,INTERGRANULAR-
INTERSERTAL;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.5-1.5 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 5-8%)
Size(mm): 0.3-0.5 Morphology: SUBHEDRAL
REPLACED BY CARB + SMEC;
CLINOPYROXENE ( 35%)
Size(mm): 0.3-0.6 Morphology: SUBHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 3%)
Size(mm): 0.05-0.2 Morphology: SUBHEDRAL,ACICULAR
SOME ACICULAR XTLS,PROBABLY MAGN-ILMENITE;
MICROCRYST GROUNDMASS ( 5%)
INTERSTITIAL MATERIAL,MICROXLN PLAG + CPX,PARTLY
REPLACED BY SMEC*
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: OL
Location: VEIN
OL + MINOR INTERSTITIAL MATERIAL REPLACED BY SMEC
+ CARB,HAIRLINE VEIN FILLED WITH BROWN SMEC;
CARBONATE
Location: INTERSTITIAL, Replacing: OL
Location: VESICLES
OL + MINOR INTERSTITIAL MATERIAL REPLACED BY SMEC
+ CARB*
Vesicles -
Size(mm): 0.5
Percent: TR
Filling: CARB
Shape: ROUND
Leg : 65 Top/Bottom Interval(mm): 600/ 650 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 180.50 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 182.63 Sect/Pc #: 2/PCE 8A
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-GRAINED,INTERSERTAL-SUBOPHITIC;
Where sampled: OTHER
CONTACT BETWEEN BASALT-LIMESTONE*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.5-1 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 2%)
Size(mm): 0.3 Morphology: SUBHEDRAL
ALTERED TO SMEC + CARB;
CLINOPYROXENE ( 30%)
Size(mm): 0.3-0.5 Morphology: ANHEDRAL
FRESH EXCEPT AT IMMEDIATE CONTACT WHERE IT IS
PARTLY ALTERED TO SMEC,2VZ=40;
OPAQUE MINERALS ( 3%)
Size(mm): 0.05-0.2 Morphology: GRANULAR-ACICULAR
MAGN-ILMENITE;
MICROCRYST GROUNDMASS ( 30%)
INTERSTITIAL MATERIAL,QUENCHED MATERIAL,PARTLY
REPLACED BY SMEC PARTICULARLY NEAR CONTACT*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL,PYX
OL + SOME PYX + INTERSTITIAL MATERIAL REPLACED BY
SMEC*
Vesicles -
Percent: 0
Leg : 65 Top/Bottom Interval(mm): 1180/1200 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 211.50 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 212.69 Sect/Pc #: 1/PCE 4E
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: SPARSELY PORPHYRITIC,MEDIUM-GRAINED,
INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 1-3 Morphology: SUBHEDRAL-ANHEDRAL
FRESH*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 0.5-0.8 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 5%)
Size(mm): 0.3-0.5 Morphology: SUBHEDRAL
REPLACED BY SMEC;
CLINOPYROXENE (35-40%)
Size(mm): 0.4-0.7 Morphology: ANHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 3-4%)
Size(mm): 0.05-0.1 Morphology: SUBHEDRAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 2-3%)
INTERSTITIAL MATERIAL,QUARTZ + FEL + APATITE,
FRESH;
QUARTZ
INTERSTITIAL;
FELDSPAR
INTERSTITIAL;
APATITE
INTERSTITIAL*
Alteration - SMECTITE
Replacing: OL
Leg : 65 Top/Bottom Interval(mm): 680/ 700 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 216.00 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 216.69 Sect/Pc #: 1/PCE 1D
ROCK = APHYRIC BASALT
POOR SLIDE--THICK AND PATCHY (PLUCKED)--CAN'T GET
RELIABLE MODAL ESTIMATES,ROCK IS HIGHLY ALTERED;
Texture: APHYRIC,VERY COARSE-GRAINED,SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 1-3 Morphology: SUBHEDRAL
PARTLY ALTERED TO SMEC;
CLINOPYROXENE ( 40%)
Size(mm): TO 3 Morphology: ANHEDRAL
SUBOPHITIC XTLS,2VZ=40,PARTLY REPLACED BY SMEC;
OPAQUE MINERALS ( 2%)
Size(mm): 0.1-0.3 Morphology: SKELETAL
OFTEN SKELETAL,PROBABLY MAGN;
MICROCRYST GROUNDMASS (10-15%)
INTERSTITIAL MATERIAL,REPLACED BY SMEC*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: PLAG,CPX
PLAG + CPX + INTERSTITIAL MATERIAL PARTLY TO
COMPLETELY REPLACED BY SMEC,ROCK IS HIGHLY
ALTERED;
SCAPOLITE
IDENTITY QUESTIONABLE,UNKNOWN MINERAL PRESENT--
POSSIBLY SCAPOLITE*
Leg : 65 Top/Bottom Interval(mm): 890/ 910 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 221.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 221.90 Sect/Pc #: 1/PCE 1C
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VERY COARSE-GRAINED,OPHITIC-INTERSERTAL;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): TO 2 Morphology: SUBHEDRAL,LATHS
FRESH,OFTEN ZONED;
CLINOPYROXENE ( 40%)
Size(mm): TO 4 Morphology: SUBHEDRAL,OPHITIC PLATES
FRESH,2VZ=40;
OPAQUE MINERALS ( 3-4%)
Size(mm): 0.2-1 Morphology: SKELETAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS (10-12%)
INTERSTITIAL MATERIAL,MOSTLY ALTERED TO SMEC,MAY
INCLUDE SOME ALTERED OL;
OLIVINE
IDENTITY UNCERTAIN,INTERSTITIAL MATERIAL MAY
INCLUDE SOME ALTERED OL*
Alteration - SMECTITE
Location: INTERSTITIAL
INTERSTITIAL MATERIAL PARTLY ALTERED TO SMEC*
Leg : 65 Top/Bottom Interval(mm): 140/ 160 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 221.00 Rock Type: IGNEOUS
Core: 25 Sample Midpoint(m) : 224.15 Sect/Pc #: 3/PCE 1
ROCK = APHYRIC BASALT;
Texture: APHYRIC,MEDIUM-GRAINED,SUBOPHITIC-INTERSERTAL;
Where sampled: NEXT TO GLASSY MARGIN*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 0.5-2 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 5%)
Size(mm): TO 0.5 Morphology: SUBHEDRAL
REPLACED BY SMEC;
CLINOPYROXENE ( 40%)
Size(mm): TO 1 Morphology: ANHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 2-3%)
Size(mm): 0.05-0.2 Morphology: SUBHEDRAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5-10%)
INTERSTITIAL MATERIAL,MOSTLY REPLACED BY SMEC*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
OL + INTERSTITIAL MATERIAL REPLACED BY SMEC*
Leg : 65 Top/Bottom Interval(mm): 150/ 170 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 239.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 239.66 Sect/Pc #: 1/PCE 1B
ROCK = APHYRIC BASALT;
Texture: APHYRIC,FINE- TO MEDIUM-GRAINED,INTERGRANULAR-
INTERSERTAL*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 0.4-1 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 2-3%)
Size(mm): 0.2-0.4 Morphology: SUBHEDRAL
REPLACED BY SMEC + CARB;
CLINOPYROXENE (40-45%)
Size(mm): 0.2-0.4 Morphology: ANHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 2%)
Size(mm): 0.05-0.1 Morphology: GRANULAR
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5-10%)
INTERSTITIAL MATERIAL,REPLACED BY GREEN SMEC?*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
OL + INTERSTITIAL MATERIAL REPLACED BY SMEC +
MINOR CARB;
CARBONATE
Location: INTERSTITIAL Replacing: OL
OL + INTERSTITIAL MATERIAL REPLACED BY SMEC +
MINOR CARB*
Leg : 65 Top/Bottom Interval(mm): 1220/1240 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 239.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 242.23 Sect/Pc #: 2/PCE 3A
ROCK = APHYRIC BASALT;
Texture: APHYRIC,FINE- TO MEDIUM-GRAINED,INTERGRANULAR-
INTERSERTAL*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 0.4-1 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 2-4%)
Size(mm): 0.2-0.4 Morphology: SUBHEDRAL
REPLACED BY SMEC + CARB;
CLINOPYROXENE (40-45%)
Size(mm): 0.2-0.4 Morphology: ANHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 2%)
Size(mm): 0.05-0.1 Morphology: GRANULAR
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5-10%)
INTERSTITIAL MATERIAL,REPLACED BY GREEN SMEC*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
OL + INTERSTITIAL MATERIAL REPLACED BY SMEC +
MINOR CARB;
CARBONATE
Location: INTERSTITIAL Replacing: OL
OL + INTERSTITIAL MATERIAL REPLACED BY SMEC +
MINOR CARB*
Leg : 65 Top/Bottom Interval(mm): 590/ 610 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 239.50 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 244.60 Sect/Pc #: 4/PCE 1E
ROCK = APHYRIC BASALT;
Texture: APHYRIC,COARSE-GRAINED,SUBOPHITIC-INTERSERTAL;
Where sampled: OTHER
UNIT INTERIOR*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 1-4 Morphology: SUBHEDRAL
FRESH;
CLINOPYROXENE (40-45%)
Size(mm): 1-2 Morphology: SUBOPHITIC PLATES
MARGINALLY ALTERED TO GREEN SMEC,2VZ=40;
OPAQUE MINERALS ( 2%)
Size(mm): 0.5-1 Morphology: SKELETAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 10%)
INTERSTITIAL MATERIAL,MOSTLY QUARTZ + FEL +
APATITE,PARTLY REPLACED BY SMEC;
QUARTZ
INTERSTITIAL MATERIAL IS MOSTLY QUARTZ + FEL +
APATITE;
FELDSPAR
INTERSTITIAL MATERIAL IS MOSTLY QUARTZ + FEL +
APATITE;
APATITE
INTERSTITIAL MATERIAL IS MOSTLY QUARTZ + FEL +
APATITE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: PYX
PYX + INTERSTITIAL MATERIAL PARTLY REPLACED BY
SMEC*
Vesicles -
Percent: 0
Leg : 65 Top/Bottom Interval(mm): 390/ 410 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 249.50 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 249.90 Sect/Pc #: 1/PCE 3B
ROCK = APHYRIC BASALT;
Texture: APHYRIC,COARSE-GRAINED,INTERGRANULAR-SUBOPHITIC*
Groundmass - PLAGIOCLASE (45-50%)
Size(mm): 1-3 Morphology: SUBHEDRAL
FRESH;
CLINOPYROXENE ( 45%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL
FRESH,2VZ=40,SOME SECTOR ZONING,SOME XTLS MAY HAVE
CORES OF PIGEONITE;
OPAQUE MINERALS ( 2-3%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5%)
INTERSTITIAL MATERIAL,QUARTZ + FEL + APATITE,
PARTLY REPLACED BY SMEC;
QUARTZ
INTERSTITIAL;
FELDSPAR
INTERSTITIAL;
APATITE
INTERSTITIAL*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
MINOR INTERSTITIAL MATERIAL REPLACED BY SMEC,SOME
ALTERED MATERIAL MAY BE AFTER OL*
Leg : 65 Top/Bottom Interval(mm): 550/ 580 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 249.50 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 253.07 Sect/Pc #: 3/PCE 1G
ROCK = APHYRIC BASALT
POOR SLIDE--THICK SECTION (PLAG HAS FIRST ORDER
YELLOW-BLUE) AND SMEARED IN PLACES;
Texture: APHYRIC,VERY COARSE-GRAINED,OPHITIC*
Groundmass - PLAGIOCLASE (30-35%)
Size(mm): 4-7 Morphology: SUBHEDRAL,CURVED
OFTEN CURVED XTLS,PARTLY REPLACED BY SMEC;
CLINOPYROXENE (60-65%)
Size(mm): 5-10 Morphology: OPHITIC PLATES
PARTLY REPLACED BY SMEC,2VZ=40;
OPAQUE MINERALS ( 1-2%)
Size(mm): 0.5 Morphology: SUBHEDRAL
PROBABLY MAGN*
Alteration - SMECTITE
Replacing: PLAG,CPX
PLAG + CPX PARTLY REPLACED BY SMEC*
Leg : 65 Top/Bottom Interval(mm): 1030/1050 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 249.50 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 253.54 Sect/Pc #: 3/PCE 1K
ROCK = APHYRIC BASALT;
Texture: APHYRIC,VERY COARSE-GRAINED,OPHITIC-INTERSERTAL;
Where sampled: FLOW INTERIOR*
Groundmass - PLAGIOCLASE (45-50%)
Size(mm): 1-3 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 3-4%)
Size(mm): 1 Morphology: SUBHEDRAL
REPLACED BY SMEC;
CLINOPYROXENE (25-45%)
Size(mm): 0.5-5 Morphology: ANHEDRAL
SUBOPHITIC,TWINNED,OFTEN ZONED,2VZ=40,SOME WITH
PROBABLE CORES OF PIGEONITE;
OPAQUE MINERALS ( 1-2%)
Size(mm): 0.5-1.5 Morphology: SKELETAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5-20%)
INTERSTITIAL MATERIAL,QUARTZ + FEL + APATITE,
PARTLY REPLACED BY SMEC;
QUARTZ
INTERSTITIAL;
FELDSPAR
INTERSTITIAL;
APATITE
INTERSTITIAL*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
OL + SOME INTERSTITIAL MATERIAL REPLACED BY SMEC*
Leg : 65 Top/Bottom Interval(mm): 810/ 830 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 254.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 256.82 Sect/Pc #: 2/PCE 1G
ROCK = APHYRIC BASALT;
Texture: APHYRIC,COARSE-GRAIN,SUBOPHITIC-INTERGRANULAR*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.5-3 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 2-3%)
Size(mm): TO 0.5
REPLACED BY BROWN SMEC;
CLINOPYROXENE (30-35%)
Size(mm): 0.5-2 Morphology: SUBHEDRAL
OFTEN ZONED,MARGINALLY ALTERED TO AMPHIBOLE +
SMEC,2VZ=40,MANY XTLS WITH CORES OF PIGEONITE
(2VZ=5);
OPAQUE MINERALS ( 3%)
Size(mm): TO 1.5 Morphology: SKELETAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5-10%)
INTERSTITIAL MATERIAL,QUARTZ + FEL + MINOR
APATITE,PARTLY REPLACED BY SMEC;
QUARTZ
INTERSTITIAL;
FELDSPAR
INTERSTITIAL;
APATITE
INTERSTITIAL,MINOR*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL,CPX
OL + SOME INTERSTITIAL MATERIAL ALTERED TO SMEC,
CPX RIMMED WITH AMPH + SMEC;
AMPHIBOLE
Replacing: CPX
CPX RIMMED WITH AMPH + SMEC*
Leg : 65 Top/Bottom Interval(mm): 550/ 570 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 277.00 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 277.56 Sect/Pc #: 1/PCE 2
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,QUENCH*
Phenocrysts- PLAGIOCLASE ( 2-3%)
Size(mm): TO 1 Morphology: SKELETAL,LATHS
FRESH*
Groundmass - FELDSPAR ( TR%)
TRACES OF FEL MICROLITES;
OLIVINE
MINUTE XTLS OF ALTERED OL;
MAGNETITE
TINY GRAINS OF MAGN;
GLASS
MATRIX IS BROWN DEVITRIFIED GLASS*
Alteration - SMECTITE
Replacing: OL
OL REPLACED BY SMEC*
Leg : 65 Top/Bottom Interval(mm): 480/ 500 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 277.00 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 278.99 Sect/Pc #: 2/PCE 4B
ROCK = APHYRIC BASALT;
Texture: APHYRIC,FINE-GRAINED,INTERGRANULAR-INTERSERTAL*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.2-1 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 1-2%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL
REPLACED BY SMEC;
CLINOPYROXENE (30-35%)
Size(mm): 0.1-0.4 Morphology: ANHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 2-3%)
Size(mm): 0.05-0.3 Morphology: SKELETAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5-10%)
INTERSTITIAL MATERIAL,QUARTZ + FEL + APATITE,
PARTLY REPLACED BY SMEC;
QUARTZ
INTERSTITIAL;
FELDSPAR
INTERSTITIAL;
APATITE
INTERSTITIAL*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
OL + SOME INTERSTITIAL MATERIAL REPLACED BY SMEC*
Leg : 65 Top/Bottom Interval(mm): 1310/1350 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 286.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 290.33 Sect/Pc #: 3/PCE 3G
ROCK = APHYRIC BASALT;
Texture: APHYRIC,FINE-GRAINED,INTERGRANULAR-INTERSERTAL*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.2-1 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 5%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL
REPLACED BY SMEC;
CLINOPYROXENE ( 30%)
Size(mm): 0.1-0.4 Morphology: ANHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 2-3%)
Size(mm): 0.05-0.3 Morphology: SKELETAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5-10%)
INTERSTITIAL MATERIAL,QUARTZ + FEL + APATITE,
PARTLY REPLACED BY SMEC;
QUARTZ
INTERSTITIAL;
FELDSPAR
INTERSTITIAL;
APATITE
INTERSTITIAL*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
OL + SOME INTERSTITIAL MATERIAL REPLACED BY SMEC*
Leg : 65 Top/Bottom Interval(mm): 630/ 660 Describer: Robinson, P.
Hole: 485A Top of Core Depth(m) : 286.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 291.14 Sect/Pc #: 4/PCE 2C
ROCK = APHYRIC BASALT;
Texture: APHYRIC,FINE-GRAINED,INTERGRANULAR-INTERSERTAL*
Groundmass - PLAGIOCLASE ( 55%)
Size(mm): 0.2-1 Morphology: SUBHEDRAL
FRESH;
OLIVINE ( 5%)
Size(mm): 0.2-0.5 Morphology: SUBHEDRAL
REPLACED BY SMEC;
CLINOPYROXENE ( 30%)
Size(mm): 0.1-0.4 Morphology: ANHEDRAL
FRESH,2VZ=40;
OPAQUE MINERALS ( 2-3%)
Size(mm): 0.05-0.2 Morphology: SKELETAL
PROBABLY MAGN;
MICROCRYST GROUNDMASS ( 5-10%)
INTERSTITIAL MATERIAL,PARTLY ALTERED TO SMEC*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
OL + SOME INTERSTITIAL MATERIAL REPLACED BY SMEC*
Vesicles -
Percent: 0
|
