Leg : 89 Top/Bottom Interval(mm): 350/ 400 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1071.70 Rock Type: IGNEOUS
Core: 93 Sample Midpoint(m) : 1072.08 Sect/Pc #: 1/PCE 4A
ROCK = OL-PLAG-CPX SP MICROPHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: SP MICROPHYRIC;
Phenocrysts- CLINOPYROXENE ( 1.7%)
PLAGIOCLASE ( 0.4%)
OLIVINE
REPLACED BY SMEC*
Groundmass - CLINOPYROXENE ( 35.7%)
PLAGIOCLASE ( 22.7%)
MAGNETITE ( 7.1%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 2.0%)
SMECTITE ( 30.2%)
Replacing: OL MICROPHENOS
ZEOLITE ( 0.1%)
CARBONATE ( TR%)
Leg : 89 Top/Bottom Interval(mm): 850/ 860 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1071.70 Rock Type: IGNEOUS
Core: 93 Sample Midpoint(m) : 1072.56 Sect/Pc #: 1/PCE 5
ROCK = PLAG-CPX SP GLOMEROPHYRIC BASALT;
Texture: SP GLOMEROPHYRIC, GLASSY, INTERSERTAL,
LOCALLY OPHITIC;
Where sampled: FLOW INTERIOR, TOWARD TOP OF UNIT 45*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.4-0.6 Morphology: SUBHEDRAL
ZONED, ALTERED GLASS INCLUSIONS;
CLINOPYROXENE ( 1%)
Size(mm): 0.4-0.6 Morphology: ANHEDRAL
AUGITE*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.05-0.25 Morphology: SUBHEDRAL
APPROX COMP AN55-60, CARLSBAD AND POLYSYNTHETIC
TWINS;
CLINOPYROXENE ( 27%)
Size(mm): 0.05-0.15 Morphology: ANHEDRAL
AUGITE;
OPAQUE MINERALS ( 5%)
Size(mm): 0.10 Morphology: GRANULAR
INCLUDES MAGN+ILMENITE, SKELETAL CORE WITHIN
REPLACEMENT PRESENT, BUT TOTALLY REPLACED;
PYRITE ( TR%)
Size(mm): 0.05-0.10 Morphology: GRANULAR
LATE GROWTH*
Alteration - CARBONATE ( <1%)
Location: MATRIX Replacing: INTERSERTAL GLASS
VERY MINOR;
CLAY MINERALS ( 25%)
Location: MATRIX Replacing: INTERSERTAL GLASS
YELLOW-BROWN SMECTITES*
Leg : 89 Top/Bottom Interval(mm): 1220/1230 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1076.60 Rock Type: IGNEOUS
Core: 94 Sample Midpoint(m) : 1077.83 Sect/Pc #: 1/PCE 3
ROCK = PLAG SP PHYRIC BASALT;
Texture: GRANULAR, SP PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 45*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.4-1.0 Morphology: SUBHEDRAL
WEAKLY ZONED, CARLSBAD TWINS*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.05-0.3 Morphology: SUBHEDRAL
APPROX COMP AN54, POLYSYNTHETIC AND CARLSBAD
TWINS;
CLINOPYROXENE ( 38%)
Size(mm): 0.05-0.2 Morphology: ANHEDRAL
APPROX COMP AUGITE;
OPAQUE MINERALS ( 15%)
Size(mm): 0.1-0.3 Morphology: ANHEDRAL
INCLUDES MAGN+ILMENITE, GRAIN SIZE AND SHAPE
OBSERVED BY ALTERATION PRODUCTS;
PYRITE
AMPHIBOLE ( <=1%)
Morphology: ACICULAR
APPROX COMP ACTINOLITE, PALE GREEN IN PLAG
LATHS*
Vesicles -
Percent: 0
Alteration - CLAY MINERALS ( 10%)
Location: MATRIX Replacing: ILMENITE,PYRITE
POSSIBLY BROWNISH SMECTITE, WITHIN AND ASSOCIATED
WITH ILMENITE AND PYRITE RICH AREAS*
Leg : 89 Top/Bottom Interval(mm): 240/ 290 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1076.60 Rock Type: IGNEOUS
Core: 94 Sample Midpoint(m) : 1078.37 Sect/Pc #: 2/PCE 2B
ROCK = OL-PLAG-CPX SP PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: SP PHYRIC, GRANULAR;
Phenocrysts- CLINOPYROXENE ( 0.4%)
PLAGIOCLASE ( 1.4%)
OLIVINE
PRESENT ORIGINALLY, BUT NOW TOTALLY REPLACED*
Groundmass - CLINOPYROXENE ( 38.0%)
PLAGIOCLASE ( 24.3%)
MAGNETITE ( 7.9%)
OPAQUE SMEC MATERIAL OBSCURES MAGN, PERCENTAGES
OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 1.5%)
SMECTITE ( 26.3%)
OPAQUE, PARTLY OBSCURES MAGN*
Leg : 89 Top/Bottom Interval(mm): 190/ 200 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1076.60 Rock Type: IGNEOUS
Core: 94 Sample Midpoint(m) : 1081.30 Sect/Pc #: 4/PCE 1B
ROCK = PLAG-CPX SP PHYRIC BASALT;
Texture: GRANULAR, SP PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 45*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.70 Morphology: SUBHEDRAL
ZONED, CARLSBAD TWINNED ONLY;
CLINOPYROXENE
Size(mm): 0.45 Morphology: SUBHEDRAL
PLAG PERCENTAGE INCLUDES CPX*
Groundmass - PLAGIOCLASE ( 33%)
Size(mm): 0.05-0.2 Morphology: LATHS
APPROX COMP AN60-65;
CLINOPYROXENE ( 30%)
Size(mm): 0.03-0.2 Morphology: GRANULAR
MAGNETITE ( 5%)
ILMENITE ( TR%)
PYRITE ( <1%)
Size(mm): <0.04
Alteration - CLAY MINERALS ( 30%)
Location: MATRIX Replacing: ILMENITE
PLUS LIMONITE*
Leg : 89 Top/Bottom Interval(mm): 210/ 260 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1076.60 Rock Type: IGNEOUS
Core: 94 Sample Midpoint(m) : 1082.84 Sect/Pc #: 5/PCE 1C
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: APHYRIC, GRANULAR;
Phenocrysts- CLINOPYROXENE ( 0.1%)
PLAGIOCLASE ( 0.5%)
OLIVINE
PRESENT ORIGINALLY, BUT NOW TOTALLY REPLACED*
Groundmass - CLINOPYROXENE ( 37.6%)
PLAGIOCLASE ( 28.3%)
MAGNETITE ( 8.3%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( TR%)
SMECTITE ( 25.1%)
ZEOLITE ( 0.1%)
ORE MINERALS
ORE CLOSELY ASSOCIATED WITH DARK SMEC-REPLACED
INTERSTITIAL GLASS*
Leg : 89 Top/Bottom Interval(mm): 1330/ 0 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1076.60 Rock Type: IGNEOUS
Core: 94 Sample Midpoint(m) : 1085.43 Sect/Pc #: 6/PCE 4
ROCK = PLAG-CPX SP GLOMEROPHYRIC BASALT;
Texture: GRANULAR, SP GLOMEROPHYRIC;
Where sampled: FLOW INTERIOR, UNIT 45*
Phenocrysts- COMBINATION ( 1 %)
Size(mm): 0.3-0.6S Morphology: UBHEDRAL
INCLUDES PLAG+CPX, APPROX COMP PLAG AN70-72,
APPROX COMP CPX AUGITE, PLAG ZONED*
Groundmass - OLIVINE
ID UNCERTAIN;
PLAGIOCLASE ( 44%)
Size(mm): 0.05-0.1 Morphology: LATHS
APPROX COMP AN50-55;
CLINOPYROXENE ( 30%)
Size(mm): 0.05-0.1
MAGNETITE ( 10%)
ILMENITE ( TR%)
Alteration - CLAY MINERALS ( 15%)
Location: MATRIX Replacing: ILMENITE
POSSIBLY REPLACING OL ALSO, THROUGHOUT MATRIX AS
WELL AS IN PATCHES*
Leg : 89 Top/Bottom Interval(mm): 610/ 620 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1087.82 Sect/Pc #: 2/PCE 16
ROCK = CPX SP GLOMEROPHYRIC BASALT;
Texture: GRANULAR, SP GLOMEROPHYRIC;
Where sampled: FLOW INTERIOR, UNIT 45*
Phenocrysts- CLINOPYROXENE ( 1%)
Size(mm): 0.2-0.3 Morphology: SUBHEDRAL
APPROX COMP AUGITE, SMALL CLUMPS OF PRISMS*
Groundmass - PLAGIOCLASE ( 44%)
Size(mm): 0.05-0.20 Morphology: LATHS
APPROX COMP AN55;
CLINOPYROXENE ( 25%)
Size(mm): 0.10 Morphology: GRANULAR
APPROX COMP AUGITE;
MAGNETITE ( 10%)
ILMENITE ( TR%)
PYRITE ( TR%)
Alteration - CLAY MINERALS ( 20%)
Location: MATRIX Replacing: ILMENITE
THROUGHOUT MATRIX*
Leg : 89 Top/Bottom Interval(mm): 200/ 250 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1088.93 Sect/Pc #: 3/PCE 3A
ROCK = PLAG SP MICROPHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: SP PHYRIC, GRANULAR, VESICULAR;
Phenocrysts- PLAGIOCLASE ( 1.6%)
PARTLY REPLACED BY SMEC*
Groundmass - CLINOPYROXENE ( 42.0%)
PLAGIOCLASE ( 22.5%)
MAGNETITE ( 9.2%)
PERCENTAGES OBTAINED BY POINT COUNT*
VESICULAR*
Alteration - PALAGONITE ( TR%)
SMECTITE ( 24.1%)
Replacing: PLAG MICROPHENOS
DARK, POSSIBLY MONTMORILLONITE;
ZEOLITE ( 0.6%)
Leg : 89 Top/Bottom Interval(mm): 400/ 410 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1092.11 Sect/Pc #: 5/PCE 3
ROCK = CPX-PLAG-OL SP PHYRIC BASALT;
Texture: GRANULAR, FINE-GRAINED, SP PHYRIC;
Where sampled: NEAR GLASSY MARGIN, UNIT 45 BASE*
Phenocrysts- COMBINATION ( 1%)
Size(mm): 0.2
INCLUDES PLAG+CPX, PLAG PRISMATIC AND ZONED, CPX
SUBHEDRAL AND SIMPLE TWINS, APPROX COMP CPX
AUGITE*
Groundmass - OLIVINE
ID UNCERTAIN, POSSIBLE EQUANT SHAPES PRESENT
REPLACED BY BROWN SMECTITE;
PLAGIOCLASE ( 34%)
Size(mm): <0.1 Morphology: LATHS
CLINOPYROXENE ( 25%)
Size(mm): 0.05 Morphology: ANHEDRAL
MAGNETITE ( 5%)
ILMENITE ( TR%)
Alteration - CLAY MINERALS ( 35%)
Location: MATRIX Replacing: ILMENITE
POSSIBLY REPLACING OL ALSO, THROUGHOUT MATRIX,
OFTEN VERY IRREGULAR MASSES*
Leg : 89 Top/Bottom Interval(mm): 590/ 600 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1092.30 Sect/Pc #: 5/PCE 4
ROCK = OL-CPX-PLAG MOD PHYRIC BASALT;
Texture: QUENCH, SUBVARIOLITIC, MOD PHYRIC;
Where sampled: NEAR GLASSY MARGIN, BASAL UNIT 45*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 0.2-0.4
ALL REPLACED BY BROWN SMECTITE;
PLAGIOCLASE ( 1%)
Size(mm): 0.5-0.8 Morphology: THIN LATHS
APPROX COMP AN72, CARLSBAD AND POLYSYNTHETIC
TWINS;
CLINOPYROXENE ( 4%)
Size(mm): 0.1-0.4 Morphology: ANHEDRAL
APPROX COMP AUGITE, GLOMEROCRYSTIC CLUMPS*
Groundmass - OLIVINE
ID UNCERTAIN, ALL REPLACED BY BROWN SMECTITE;
PLAGIOCLASE ( 30%)
Size(mm): <0.1 Morphology: LATHS AND MICROLITES
APPROX COMP AN55, SMALLER XTLS SHOWING QUENCH
TEXTURE FEATURES;
CLINOPYROXENE ( 20%)
Size(mm): 0.05 Morphology: ANHEDRAL, CURVED PLUMOSE
SMALLER XTLS SHOWING QUENCH TEXTURE FEATURES;
MAGNETITE ( 1%)
ILMENITE ( TR%)
Alteration - CLAY MINERALS ( 40%)
Location: MATRIX,PHENOS Replacing: OL,ILMENITE
BROWN SMECTITE, REPLACEMENT THROUGHOUT MATRIX*
Leg : 89 Top/Bottom Interval(mm): 610/ 630 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1092.32 Sect/Pc #: 5/PCE 4
ROCK = PLAG-CPX PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: PHYRIC, QUENCH;
Phenocrysts- CLINOPYROXENE ( 9.7%)
LARGER GRANULAR CPX RECORDED AS PHENOS;
PLAGIOCLASE ( 1.3%)
Groundmass - CLINOPYROXENE ( 58.4%)
PLAGIOCLASE ( 13.2%)
MAGNETITE ( 8.6%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( TR%)
SMECTITE ( 8.5%)
CARBONATE ( 0.4%)
Leg : 89 Top/Bottom Interval(mm): 630/ 640 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1092.34 Sect/Pc #: 5/PCE 4
ROCK = OL-CPX-PLAG MOD PHYRIC GLASSY BASALT;
Texture: QUENCH, SUBVARIOLITIC, MOD PHYRIC, GLASSY;
Where sampled: NEXT TO GLASSY MARGIN, BASAL UNIT 45*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.4 Morphology: SUBHEDRAL
REPLACED BY DARK BROWN SMECTITE;
PLAGIOCLASE ( 1%)
Size(mm): 0.2 Morphology: LATHS
GLOMEROCRYSTIC CLUMPS;
CLINOPYROXENE ( 2%)
Size(mm): 0.1 Morphology: EUHEDRAL, SUBHEDRAL
GLOMEROCRYSTIC CLUMPS*
Groundmass - PLAGIOCLASE ( 24%)
Size(mm): <=0.06 Morphology: MICROLITE
CLINOPYROXENE ( 20%)
Size(mm): <=0.06 Morphology: GRANULAR
MAGNETITE ( 2%)
ILMENITE ( TR%)
GLASS ( TR%)
REPLACED BY RADIATE BROWN SMECTITE*
Alteration - CARBONATE ( <1%)
Location: MATRIX Replacing: OL
SMECTITE ( 50%)
Location: MATRIX Replacing: OL PHENOS, INTERSTITIAL
Replacing: GLASS
BROWN SMECTITE*
Leg : 89 Top/Bottom Interval(mm): 890/ 900 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1092.60 Sect/Pc #: 5/PCE 5B
ROCK = OL-CPX MOD PHYRIC GLASSY BASALT;
Texture: QUENCH, SUBVARIOLITIC, MOD PHYRIC, GLASSY;
ADJACENT TO VEIN GLASS, HOLOXTLINE ZONE (0.8MM),
THEN FINED-GRAINED CHILLED GLASSY BASALT ZONE
(1.2MM) GRADING INTO MORE HOLOXTLINE BASALT,
THEREFORE TWO CHILLED ZONES;
Where sampled: NEAR GLASSY MARGIN, TOP OF UNIT 46*
Phenocrysts- COMBINATION ( 5%)
INCLUDES OL+PLAG+CPX, OL 0.1MM AS SMECTITE
PSEUDOMORPHS, PLAG TR, CPX 0.05MM
MICROGLOMEROCRYSTIC CLUSTERS*
Groundmass - OLIVINE ( TR%)
PERCENTAGE UNCERTAIN;
PLAGIOCLASE ( 30%)
Size(mm): <=0.1 Morphology: MICROLITES
SOME SWALLOW-TAILS;
CLINOPYROXENE ( 10%)
Size(mm): 0.12 Morphology: GRANULES
MAGNETITE ( 5%)
ILMENITE ( TR%)
Alteration - COMBINATION ( 50%)
INCLUDES CARB+CLAY.MIN+ZEOLITES+ANALCITE, CLAY IN
MATRIX AND GLASS RIND, ALL OTHERS IN VIENS,
REPLACING GLASS RIND+INTERSTITIAL GLASS+OL, AND IN
PART PLAG,SMECTITIE REPLACES GLASS ADJACENT TO
CALCITE-ZEOLITE-ANALCITE VEIN, VEIN FROM WATER
GENERATED FRACTURE IN BASALT*
Leg : 89 Top/Bottom Interval(mm): 990/1040 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1092.72 Sect/Pc #: 5/PCE 5C
ROCK = OL-PLAG-CPX PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: PHYRIC, QUENCH;
Phenocrysts- CLINOPYROXENE ( 20.3%)
LARGER GRANULAR CPX RECORDED AS PHENOS;
PLAGIOCLASE ( 0.3%)
OLIVINE
PRESENT ORIGINALLY, BUT NOW TOTALLY REPLACED*
Groundmass - CLINOPYROXENE ( 25.1%)
PLAGIOCLASE ( 18.7%)
MAGNETITE ( 10.9%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 1.3%)
SMECTITE ( 23.5%)
CARBONATE ( 0.2%)
Leg : 89 Top/Bottom Interval(mm): 1270/1280 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1092.98 Sect/Pc #: 5/PCE 5E
ROCK = CPX MOD GLOMEROPHYRIC BASALT;
Texture: GRANULAR, POORLY INTERSERTAL;
Where sampled: NEAR GLASSY MARGIN, TOWARD TOP OF UNIT 46*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.2 Morphology: SUBHEDRAL
SMECTITE PSEUDOMORPHED;
CLINOPYROXENE ( 3%)
Size(mm): <=0.1 Morphology: ANHEDRAL
GLOMEROPHYRIC CLUMPS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.05-0.1 Morphology: LATHS
APPROX COMP AN60, SOME HAVE CONES REPLACED BY
OPAQUE MATERIAL, POSSIBLY MONT OR ANALCITE;
CLINOPYROXENE ( 17%)
Size(mm): 0.05 Morphology: GRANULAR
MAGNETITE ( 5%)
Alteration - CLAY MINERALS ( 35%)
Location: MATRIX Replacing: ILMENITE
POSSIBLY REPLACING SOME PLAG*
Leg : 89 Top/Bottom Interval(mm): 1010/1020 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1085.70 Rock Type: IGNEOUS
Core: 95 Sample Midpoint(m) : 1094.22 Sect/Pc #: 6/PCE 1J
ROCK = OL-CPX MOD PHYRIC BASALT;
Texture: GRANULAR, INTERSERTAL, MOD PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 46*
Phenocrysts- COMBINATION ( 5%)
INCLUDES OL+CPX, OL 0.2-0.3MM EUHEDRAL, REPLACED
BY BROWN SMECTITE, CPX 0.1-0.15MM GRANULAR,
GLOMEROCRYSTIC CLUMPS*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.1-0.15 Morphology: LATHS
CLINOPYROXENE ( 25%)
Size(mm): 0.05-0.1 Morphology: GRANULAR
MAGNETITE ( 5%)
Size(mm): 0.03-0.1 Morphology: EQUANT, SKELETAL
REPLACED BY UNIDENT BROWN CLAY;
GLASS ( TR%)
BROWN SMECTITE NOW, SOME SMECTITE AREAS ARE
INTERSTITIAL TO INTERSERTAL PLAG LATHS AND
ASSOCIATED WITH IRON ORE, MAY BE LATE GLASS*
Alteration - CLAY MINERALS ( 30%)
Location: MATRIX Replacing: ILMENITE,OL
POSSIBLY REPLACING INTERSTITIAL GLASS*
Leg : 89 Top/Bottom Interval(mm): 320/ 330 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1094.90 Rock Type: IGNEOUS
Core: 96 Sample Midpoint(m) : 1095.23 Sect/Pc #: 1/PCE 1D
ROCK = OL-CPX PHYRIC BASALT;
Texture: GRANULAR, INTERSERTAL, PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 46*
Phenocrysts- OLIVINE ( 10%)
Size(mm): 0.2-0.3 Morphology: EUHEDRAL
REPLACED BY BROWN SMECTITE AND OPAQUE MATERIAL;
CLINOPYROXENE ( 1%)
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL
GLOMEROCRYSTIC CLUMPS*
Groundmass - OLIVINE
ID UNCERTAIN;
PLAGIOCLASE ( 36%)
Size(mm): 0.05-0.1 Morphology: LATHS
APPROX COMP AN62-65, POLYSYNTHETIC TWINNED;
CLINOPYROXENE ( 20%)
Size(mm): 0.05-0.01 Morphology: GRANULAR
MAGNETITE ( 5%)
GLASS
ID UNCERTAIN*
Alteration - CLAY MINERALS ( 28%)
Location: MATRIX Replacing: ILMENITE,OL
POSSIBLY REPLACING SOME INTERSTITIAL GLASS*
Leg : 89 Top/Bottom Interval(mm): 1220/1270 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1094.90 Rock Type: IGNEOUS
Core: 96 Sample Midpoint(m) : 1097.64 Sect/Pc #: 2/
ROCK = CPX-PLAG MOD PHYRIC BASALT
SOURCE IS IR;
Texture: GLOMEROPHYRIC, HYPOCRYSTALLINE*
Phenocrysts- PLAGIOCLASE
CLINOPYROXENE
Groundmass - GLASS
INTERSTITIAL*
Alteration - SMECTITE
Replacing: GLASS
BROWNISH*
Leg : 89 Top/Bottom Interval(mm): 1400/1430 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1094.90 Rock Type: IGNEOUS
Core: 96 Sample Midpoint(m) : 1099.32 Sect/Pc #: 3/PCE 3D
ROCK = OL-PYX SP PHYRIC BASALT
SIMILAR TO 89-462A-96-1 32-33CM, EXCEPT FEWER
PHENOS, OL POORLY FORMED AND ALL SMECTITE
ALTERATION PATCHES DO NOT APPEAR TO BE OL PHENO
REPLACEMENT;
Texture: GRANULAR, INTERSERTAL, SP PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 46*
Groundmass - PLAGIOCLASE
APPROX COMP AN60*
Leg : 89 Top/Bottom Interval(mm): 1300/1310 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1094.90 Rock Type: IGNEOUS
Core: 96 Sample Midpoint(m) : 1102.21 Sect/Pc #: 5/PCE 7B
ROCK = OL-CPX MOD PHYRIC BASALT
Texture: GRANULAR, INTERSERTAL, MOD PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 46*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.2-0.3 Morphology: SUBHEDRAL
REPLACED BY BROWN SMECTITE;
CLINOPYROXENE ( 2%)
Size(mm): 0.1-0.2 Morphology: ANHEDRAL
GLOMEROCRYSTIC CLUMPS*
Groundmass - PLAGIOCLASE ( 43%)
Size(mm): 0.05-0.1 Morphology: LATHS
APPROX COMP AN55-60, PARTIAL REPLACEMENT BY
YELLOWISH SMECTITE;
CLINOPYROXENE ( 20%)
Size(mm): 0.05 Morphology: GRANULAR
APPROX COMP AUGITE;
MAGNETITE ( 10%)
Alteration - CLAY MINERALS ( 20%)
Location: MATRIX Replacing: OL, ILMENITE, PLAG
Leg : 89 Top/Bottom Interval(mm): 710/ 760 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1104.00 Rock Type: IGNEOUS
Core: 97 Sample Midpoint(m) : 1104.74 Sect/Pc #: 1/PCE 3C
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: GRANULAR, APHYRIC;
Groundmass - CLINOPYROXENE ( 39.8%)
PLAGIOCLASE ( 27.5%)
MAGNETITE ( 9.2%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 0.2%)
SMECTITE ( 22.9%)
BROWN, IN ASSOCIATION WITH ZEOL FIBERS;
ZEOLITE ( 0.3%)
FIBER, ASSOCIATED WITH BROWN SMEC*
Leg : 89 Top/Bottom Interval(mm): 1100/1110 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1104.00 Rock Type: IGNEOUS
Core: 97 Sample Midpoint(m) : 1111.10 Sect/Pc #: 5/PCE 3
ROCK = OL PHYRIC BASALT
SIMILAR TO 89-462A-96-5 30-31CM, EXCEPT MORE OL
PHENOS, RELATIVELY FEW CPX OR PLAG PHENOS, MUCH
BROWN SMECTITE ASSOCIATED WITH LEUCOXENIZED
SKELETAL ILMENITE, MORE FE ORE RICH;
Texture: GRANULAR, PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 46*
Phenocrysts- OLIVINE
MORE THAN 89-462A-96-5 30-31;
CLINOPYROXENE
RELATIVELY FEW;
PLAGIOCLASE
RELATIVELY FEW*
Leg : 89 Top/Bottom Interval(mm): 50/ 100 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1113.20 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 1120.78 Sect/Pc #: 6/PCE 1
ROCK = CPX-PLAG-OL SP PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: GRANULAR, SP PHYRIC;
Phenocrysts- CLINOPYROXENE ( TR%)
PLAGIOCLASE ( 1.2%)
GLOMEROPHYRIC, SOME WITH CPX INCLUSION ZONES;
OLIVINE
PRESENT ORIGINALLY, BUT NOW TOTALLY REPLACED*
Groundmass - CLINOPYROXENE ( 41.1%)
PLAGIOCLASE ( 25.8%)
MAGNETITE ( 9.1%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 0.4%)
SMECTITE ( 22.3%)
Leg : 89 Top/Bottom Interval(mm): 250/ 260 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1113.20 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 1120.96 Sect/Pc #: 6/PCE 3A
ROCK = OL-CPX PHYRIC BASALT
Texture: GRANULAR, INTERSERTAL, PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 46*
Phenocrysts- OLIVINE ( 10%)
Size(mm): 0.1-0.4 Morphology: SUBHEDRAL, EUHEDRAL
REPLACED BY RED-BROWN SMECTITE AND OP MATERIAL;
CLINOPYROXENE ( 2%)
Size(mm): 0.1-0.4 Morphology: GRANULAR
GLOMEROCRYSTIC GROUPS*
Groundmass - PLAGIOCLASE ( 33%)
Size(mm): 0.05-0.1 Morphology: LATHS
CLINOPYROXENE ( 25%)
Size(mm): 0.05-0.1 Morphology: GRANULAR
MAGNETITE ( 10%)
Morphology: GRANULAR, SKELETAL
REPLACED BY CLAY;
GLASS
POSSIBLY SOME INTERSTITIAL GLASS, NOW REPLACED BY
GOLDEN BROWN SMECTITE*
Alteration - CLAY MINERALS ( 20%)
Location: MATRIX Replacing: OL, ILMENITE
ALSO REPLACING MINOR PLAG AND POSSIBLY SOME GLASS*
Leg : 89 Top/Bottom Interval(mm): 410/ 460 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1113.20 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 1121.14 Sect/Pc #: 6/PCE 4C
ROCK = PLAG-CPX PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, PHYRIC;
Phenocrysts- CLINOPYROXENE ( 10.6%)
PLAGIOCLASE ( 2.7%)
Groundmass - CLINOPYROXENE ( 46.6%)
LARGER GRANULAR CPX RECORDED AS PHENOS;
PLAGIOCLASE ( 14.2%)
MAGNETITE ( 9.2%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 13.7%)
SMECTITE ( 3.1%)
Leg : 89 Top/Bottom Interval(mm): 470/ 480 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1113.20 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 1121.18 Sect/Pc #: 6/PCE 3C
ROCK = OL-CPX MOD PHYRIC GLASSY BASALT
Texture: QUENCH, HYALOPILITIC (PLUMROSE CRYSTALLITES
ROCK = LACED BY SMECTITE), MOD PHYRIC, GLASSY;
Where sampled: FINE-GRAINED SUBUNIT WITHIN UNIT 46*
Phenocrysts- OLIVINE ( 8%)
Size(mm): 0.15-0.20 Morphology: SUBHEDRAL
REPLACED BY GOLDEN BROWN SMECTITE;
PLAGIOCLASE ( TR%)
CLINOPYROXENE ( 5%)
Size(mm): 0.05-0.10 Morphology: SUBHEDRAL
SOME GLOMEROCRYSTIC GROUPS*
Groundmass - PLAGIOCLASE ( 32%)
Size(mm): 0.05 Morphology: LATHS
MICROPHENOCRYSTS IN GLASSY MATRIX;
CLINOPYROXENE ( 20%)
Size(mm): 0.05 Morphology: GRANULAR
MICROPHENOCRYSTS IN GLASSY MATRIX;
MAGNETITE ( 5%)
GLASS
NOW POSSIBLY SMECTITE PLUMES, POSSIBLY PYX
CRYSTALLITES*
Alteration - CLAY MINERALS ( 30%)
Location: MATRIX Replacing: GLASSY MATRIX, OL
Leg : 89 Top/Bottom Interval(mm): 990/1000 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1113.20 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 1121.70 Sect/Pc #: 6/PCE 7C
ROCK = OL-CPX MOD PHYRIC BASALT
Texture: QUENCH, HYALOPILITIC, MOD PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 46*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.3-0.4 Morphology: SUBHEDRAL, ANHEDRAL
REPLACED BY YELLOW-BROWN SMECTITE AND DARK OPAQUE
MATERIAL;
CLINOPYROXENE ( 5%)
Size(mm): 0.2-0.4 Morphology: SUBHEDRAL
GLOMEROCRYSTIC CLUMPS*
Groundmass - PLAGIOCLASE ( 15%)
Morphology: MICROLITES, LATHS
CLINOPYROXENE ( 60%)
Morphology: GRANULAR IN MATRIX, ALSO
Morphology: RADIATE PLUMES AND SHEAVES
PLUMES AND SHEAVES POSSIBLY LATER GROWTH LATER
THAN PLAG MICROLITES;
MAGNETITE ( 2%)
Alteration - CLAY MINERALS ( 15%)
Location: MATRIX, Replacing: OL, ILMENITE
Location: PHENOS
Leg : 89 Top/Bottom Interval(mm): 470/ 480 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1113.20 Rock Type: IGNEOUS
Core: 98 Sample Midpoint(m) : 1122.68 Sect/Pc #: 7/PCE 4
ROCK = PYX-OL-PLAG PHYRIC BASALT
SIMILAR TO 89-462A-98-6 99-100CM, EXCEPT LESS OL,
MORE PLAG PHENOS, CPX HAS GLOMEROCRYTSTIC CLUMPS,
RADIATE PLUMROSE AND SUBVARIOLITIC PYX IN MATRIX;
Texture: QUENCH, HYALOPILITIC, PHYRIC;
Where sampled: FLOW INTERIOR, UNIT 46*
Leg : 89 Top/Bottom Interval(mm): 1000/ 0 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1122.30 Rock Type: IGNEOUS
Core: 99 Sample Midpoint(m) : 1123.30 Sect/Pc #: 1/PCE 9
ROCK = OL MOD PHYRIC AND CPX-PLAG GLOMEROPHYRIC BASALT
Texture: QUENCH, SUBVARIOLITIC AND GRANULAR
THREE GRAIN-SIZES/TEXTURES, PHENOCRYSTS/
GLOMEROCRYSTS, GRANULAR PLAG+CPX IN MATRIX, AND
QUENCH PLAG+CPX IN MATRIX;
Where sampled: NEAR GLASSY MARGIN, BASAL UNIT 46*
Phenocrysts- OLIVINE ( 6%)
Size(mm): 0.1 Morphology: SUBHEDRAL
REPLACED BY YELLOW-BROWN SMECTITE;
PLAGIOCLASE ( 1%)
Morphology: SUBHEDRAL
CONES REPLACED BY OPAQUES, ZONED;
CLINOPYROXENE ( 2%)
Size(mm): 0.1-0.15 Morphology: GRANULAR
GLOMEROCRYSTIC CLUMPS*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.05-0.1 Morphology: LATHS, SWALLOW-TAILED
Morphology: MICROLITES
CLINOPYROXENE ( 44%)
Morphology: GRANULAR, ELONGATED RADIATE
Morphology: PLUMES
GRANULES <0.05MM, PLUMES 0.3MM;
MAGNETITE ( 2%)
Alteration - CLAY MINERALS ( 25%)
Location: MATRIX, Replacing: OL, PLAG, ILMENITE
Location: PHENOS
ZEOLITE
Location: VEIN
Leg : 89 Top/Bottom Interval(mm): 1150/ 0 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1122.30 Rock Type: SEDIMENTARY
Core: 99 Sample Midpoint(m) : 1123.45 Sect/Pc #: 1/PCE 11A
ROCK = VITRIC TUFF
ANGULAR AND SUBANGULAR ALTERED GLASS FRAGMENTS IN
PALE YELLOW SMECTITE MATRIX;
Texture: FRAGMENTARY;
Where sampled: GLASSY MARGIN, TOP OF UNIT 47*
Groundmass - GLASS
GLASS IS NOW YELLOW SMECTITE AND ANALCITE,
OXIDIZED (HEMATITE), OPAQUE MATERIAL*
Leg : 89 Top/Bottom Interval(mm): 1290/ 0 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1122.30 Rock Type: IGNEOUS
Core: 99 Sample Midpoint(m) : 1123.59 Sect/Pc #: 1/PCE 12
ROCK = OL-PYX PHYRIC GLASSY BASALT;
Texture: QUENCH, HYALOPILITIC, PHYRIC, GLASSY;
Where sampled: NEAR GLASSY MARGIN, TOP OF UNIT 47*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL
REPLACED BY YELLOW SMECTITE;
CLINOPYROXENE ( 15%)
Size(mm): 0.05-0.1 Morphology: GRANULAR
LOOSE GLOMEROCRYSTIC CLUMPS*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.1 Morphology: MICROLITES
QUENCHED MATRIX;
CLINOPYROXENE ( 42%)
Size(mm): 0.1 Morphology: PLUMROSE RADIATE GROUPS
QUENCHED MATRIX;
MAGNETITE ( 1%)
GLASS
INTERSERTAL, NOW YELLOW SMECTITE, BETWEEN CPX
PLUMES*
Alteration - CLAY MINERALS ( 20%)
Location: MATRIX, Replacing: OL, INTERSERTAL GLASS
Location: PHENOS
POSSIBLY REPLACING ILMENITE;
ZEOLITE
Location: VEIN
Leg : 89 Top/Bottom Interval(mm): 60/ 110 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1122.30 Rock Type: IGNEOUS
Core: 99 Sample Midpoint(m) : 1123.89 Sect/Pc #: 2/PCE 1
ROCK = PLAG-OL-CPX PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH;
Phenocrysts- CLINOPYROXENE ( 16.4%)
PLAGIOCLASE ( 0.6%)
CORES OF PLAG MICROPHENOS REPLACED BY GREEN SMEC;
OLIVINE
PRESENT ORIGINALLY BUT NOW TOTALLY REPLACED*
Groundmass - CLINOPYROXENE ( 29.4%)
PLAGIOCLASE ( 11.8%)
MAGNETITE ( 9.6%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 25.0%)
SMECTITE ( 6.9%)
GREEN, REPLACING CORES OF PLAG MICROPHENOS;
CARBONATE ( 0.4%)
Leg : 89 Top/Bottom Interval(mm): 280/ 290 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1131.50 Rock Type: IGNEOUS
Core: 100 Sample Midpoint(m) : 1133.28 Sect/Pc #: 2/PCE 2B
ROCK = APHYRIC BASALT;
Texture: SUBVARIOLITIC, INTERSERTAL;
Where sampled: FLOW INTERIOR, UNIT 48*
Phenocrysts- OLIVINE ( TR%)
ID UNCERTAIN*
Groundmass - PLAGIOCLASE ( 52%)
Size(mm): 0.1-0.15 Morphology: SERRATED MICROLITES
CONES SOMETIMES REPLACED BY DARK OPAQUE MATERIAL,
POSSIBLY MONT;
CLINOPYROXENE ( 10%)
Size(mm): 0.1-0.2 Morphology: GRANULAR
GROWN AFTER PLAG;
MAGNETITE ( 5%)
Morphology: SKELETAL
Alteration - CARBONATE ( <1%)
Location: MATRIX
CLAY MINERALS ( 30%)
Location: MATRIX Replacing: IN FE ORE AREAS
ZEOLITE ( 2%)
Location: MATRIX
BROWNISH RADIATING GROUPS*
Leg : 89 Top/Bottom Interval(mm): 610/ 660 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1131.50 Rock Type: IGNEOUS
Core: 100 Sample Midpoint(m) : 1133.64 Sect/Pc #: 2/PCE 3A
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: INTERSERTAL, VARIOLITIC;
Phenocrysts- PLAGIOCLASE ( TR%)
Groundmass - CLINOPYROXENE ( 46.1%)
PLAGIOCLASE ( 19.5%)
MAGNETITE ( 8.9%)
MAGN PARTLY OBSCURED BY OPAQUE SMEC;
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 1.2%)
SMECTITE ( 24.1%)
OPAQUE, PARTLY OBSCURING MAGN*
Leg : 89 Top/Bottom Interval(mm): 680/ 690 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1134.50 Rock Type: IGNEOUS
Core: 101 Sample Midpoint(m) : 1135.19 Sect/Pc #: 1/PCE 3
ROCK = APHYRIC GLASSY BASALT;
SIMILAR TO 89-462A-100-2 28-29CM, EXCEPT MUCH DARK
OPAQUE CLAY MATERIAL REPLACING PROBABLY
INTERSTITIAL GLASS, MAGN OFTEN ASSOCIATED WITH
THOSE AREAS, MINOR PYRITE, ORIGINAL COMP ESTIMATE
PLAG 50+CPX 30+MAGN 5+GLASS 15;
Texture: SUBVARIOLITIC, INTERSERTAL, APHYRIC, GLASSY;
Where sampled: FLOW INTERIOR, UNIT 48*
Leg : 89 Top/Bottom Interval(mm): 1170/1220 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1134.50 Rock Type: IGNEOUS
Core: 101 Sample Midpoint(m) : 1137.20 Sect/Pc #: 2/PCE 3
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: INTERSERTAL;
Phenocrysts- PLAGIOCLASE ( TR%)
Groundmass - CLINOPYROXENE ( 38.8%)
PLAGIOCLASE ( 33.7%)
MAGNETITE ( 4.6%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( TR%)
SMECTITE ( 22.9%)
GRANULAR CRYSTALLITED IN SMEC-REPLACED
INTERSTITIAL GLASS*
Leg : 89 Top/Bottom Interval(mm): 570/ 580 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1134.50 Rock Type: IGNEOUS
Core: 101 Sample Midpoint(m) : 1139.58 Sect/Pc #: 4/PCE 2C
ROCK = APHYRIC GLASSY BASALT;
SIMILAR TO 89-462A-100-2 28-29CM, EXCEPT GENERALLY
MORE INTERSERTAL GLASS, REPLACED BY BROWNISH
SMECTITE WITHIN WHICH ARE PLAG MICROLITES,
INTERESTING CPX-PLAG VARIOLITIC TEXTURES, ORIGINAL
COMP ESTIMATE PLAG 50+CPX 22+MAGN 8+GLASS 20;
Texture: SUBVARIOLITIC, APHYRIC, GLASSY;
Where sampled: FLOW INTERIOR, UNIT 48 TOWARD BASE*
Leg : 89 Top/Bottom Interval(mm): 1150/1200 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1134.50 Rock Type: IGNEOUS
Core: 101 Sample Midpoint(m) : 1140.17 Sect/Pc #: 4/PCE 3F
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: INTERSERTAL;
Groundmass - CLINOPYROXENE ( 40.6%)
PLAGIOCLASE ( 31.9%)
MAGNETITE ( 8.3%)
PYRITE ( 0.6%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( TR%)
RARE ISLETS OF GOLDEN PALAG IN YELLOW-BROWN SMEC;
SMECTITE ( 16.6%)
ZEOLITE ( 2.0%)
Leg : 89 Top/Bottom Interval(mm): 520/ 560 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1134.50 Rock Type: IGNEOUS
Core: 101 Sample Midpoint(m) : 1141.04 Sect/Pc #: 5/
ROCK = APHYRIC BASALT
SOURCE IS IR;
Texture: APHYRIC, MEDIUM-GRAINED,HYPOCRYSTALLINE*
Groundmass - PLAGIOCLASE
Morphology: SKELETAL
PLAG ALTERATION DOMAINS WITH ZEOLITE,KSPAR AND
SMECTITE*
KFELDSPAR
Alteration - SMECTITE
ZEOLITE
Leg : 89 Top/Bottom Interval(mm): 1120/1160 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1142.90 Rock Type: IGNEOUS
Core: 102 Sample Midpoint(m) : 1144.04 Sect/Pc #: 1/PCE 2H
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: INTERSERTAL, APHYRIC;
Groundmass - CLINOPYROXENE ( 40.1%)
PLAGIOCLASE ( 33.6%)
MAGNETITE ( 3.7%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( TR%)
SMECTITE ( 21.0%)
ZEOLITE ( 1.6%)
NEEDLES IN PLAG*
Leg : 89 Top/Bottom Interval(mm): 1430/1470 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1142.90 Rock Type: IGNEOUS
Core: 102 Sample Midpoint(m) : 1147.35 Sect/Pc #: 3/PCE 4
ROCK = APHYRIC BASALT
POSSIBLY SOME OL, SOURCE IS INITIAL REPORTS;
Texture: GRANULAR, APHYRIC;
Groundmass - CLINOPYROXENE ( 45.5%)
PLAGIOCLASE ( 27.0%)
MAGNETITE ( 3.2%)
PARTLY OBSCURED BY OPAQUE SMEC;
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 3.0%)
SMECTITE ( 20.0%)
OPAQUE, PARTLY OBSCURING MAGN;
ZEOLITE ( 1.3%)
Leg : 89 Top/Bottom Interval(mm): 70/ 80 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1142.90 Rock Type: IGNEOUS
Core: 102 Sample Midpoint(m) : 1147.48 Sect/Pc #: 4/PCE 1B
ROCK = CPX-OL SP PHYRIC GLASSY BASALT;
Texture: INTERSERTAL, GRANULAR, SP PHYRIC, GLASSY;
Where sampled: FLOW INTERIOR, UNIT 48*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.4-0.6 Morphology: SUBHEDRAL
CLINOPYROXENE ( 1%)
Size(mm): 0.2-0.4 Morphology: ANHEDRAL,SUBHEDRAL
TENDENCY TO GLOMEROCRYSTIC GROUPING*
Groundmass - PLAGIOCLASE ( 43%)
Size(mm): 0.1-0.2 Morphology: LATHS
APPROX COMP AN55-60;
CLINOPYROXENE ( 35%)
Size(mm): 0.05-0.1 Morphology: GRANULAR
APPROX COMP AUGITE;
MAGNETITE ( 5%)
GLASS ( 5%)
INTERSTITIAL GREEN-YELLOW PALAGONITIZED GLASS,
PARTIAL REPLACEMENT BY BROWN GRANULAR SMECTITE
ALONG MARGINS AND RIMMING CRYSTALS WITHIN GLASS
AREA*
Alteration - CLAY MINERALS ( 10%)
Location: MATRIX Replacing: GLASS
ASSOCIATED WITH FE ORE AREAS*
Leg : 89 Top/Bottom Interval(mm): 510/ 550 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1142.90 Rock Type: IGNEOUS
Core: 102 Sample Midpoint(m) : 1147.93 Sect/Pc #: 4/PCE 2
ROCK = OL-PLAG-CPX MOD PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, MOD PHYRIC;
Phenocrysts- CLINOPYROXENE ( 2.7%)
PLAGIOCLASE ( 2.0%)
OLIVINE
OL MICROPHENOS REPLACED BY SMEC AND MINOR CARB*
Groundmass - CLINOPYROXENE ( 51.1%)
PLAGIOCLASE ( 22.1%)
MAGNETITE ( 4.4%)
PYRITE ( 0.4%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 3.8%)
SMECTITE ( 13.4%)
YELLOW-BROWN, REPLACING OL MICROPHENOS;
CARBONATE ( 0.2%)
MINOR, REPLACING OL MICROPHENOS*
Leg : 89 Top/Bottom Interval(mm): 590/ 630 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1142.90 Rock Type: IGNEOUS
Core: 102 Sample Midpoint(m) : 1148.01 Sect/Pc #: 4/PCE 3
ROCK = CPX-PLAG-OL MOD PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, MOD PHYRIC;
Phenocrysts- CLINOPYROXENE ( 2.4%)
PLAGIOCLASE ( 3.4%)
OLIVINE
PRESENT ORIGINALLY, BUT NOW TOTALLY REPLACED*
Groundmass - CLINOPYROXENE ( 76.0%)
MATRIX CPX ALSO INCLUDES ALTERED GLASS BETWEEN
PLUMROSE CRYSTALLITES;
PLAGIOCLASE ( 3.3%)
MAGNETITE ( 4.7%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - SMECTITE ( 1.6%)
ZEOLITE ( 3.1%)
CARBONATE ( 0.5%)
Leg : 89 Top/Bottom Interval(mm): 1310/1360 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1142.90 Rock Type: IGNEOUS
Core: 102 Sample Midpoint(m) : 1148.74 Sect/Pc #: 4/PCE 6E
ROCK = OL-PLAG-CPX SP PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, VARIOLITIC, SP PHYRIC;
Phenocrysts- CLINOPYROXENE ( 1.0%)
PLAGIOCLASE ( 0.4%)
OLIVINE
PRESENT ORIGINALLY, BUT NOW REPLACED BY SMEC*
Groundmass - CLINOPYROXENE ( 50.5%)
PLAGIOCLASE ( 16.9%)
MAGNETITE ( 9.9%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 13.0%)
SMECTITE ( 8.3%)
DARK GOLDEN-BROWN, REPLACING OL MICROPHENOS*
Leg : 89 Top/Bottom Interval(mm): 1320/1330 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1142.90 Rock Type: IGNEOUS
Core: 102 Sample Midpoint(m) : 1148.73 Sect/Pc #: 4/PCE 6D
ROCK = CPX-PLAG MOD PHYRIC GLASSY BASALT;
Texture: HYALOPILITIC, QUENCH;
Where sampled: BASE OF A SUBUNIT IN UNIT 49*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.1-0.4 Morphology: SUBHEDRAL
CARLSBAD , POLYSYNTHETIC TWINS, ZONING RARE,
APPROX COMP AN55-60;
CLINOPYROXENE ( 4%)
Size(mm): 0.05-0.4 Morphology: ANHEDRAL
APPROX COMP AUGITE, LOOSE GLOMEROCRYSTIC GROUPS
WITH LARGER PLAG LATHS, OPHITIC TEXTURE*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): 0.05-0.3 Morphology: ELONGATED SKELETAL MICROLITES
APPROX COMP AN50-55, SOME WITH REPLACED CONES,
LARGER ONES WITH TWO OVERGROWTH ZONES, CARLSBAD
TWINS;
CLINOPYROXENE ( 44%)
Morphology: PLUMES,SHEAVES,GRANULES
PLUMES AND SHEAVES 0.1-0.7MM LONG, GRANULES
0.05MM, PLUMES COMPOSED OF CRYSTALLITES AND
SUBRECOGNIZABLE CPX ARE DARKER IN COLOR;
MAGNETITE ( 5%)
Morphology: GRAINS
GRANULAR THROUGHOUT MATRIX AROUND CPX PLUMES IN
GLASS AREAS, SOME VERY LARGE CORRODED GRAINS ALSO
SURROUNDED BY SMECTITE;
GLASS
ALL REPLACED BY YELLOW-BROWN SMECTITE, OPAQUE
IN VERY DARK AREAS*
Vesicles -
Percent: 1
IN RARE CASES GRADATION FROM GOLDEN YELLOW-BROWN
TO DARK BROWN OPAQUE ZONE TO RADIATE YELLOW-GREEN
GREEN PLEOCHROIC PRISMS, POSSIBLY SMECTITE AND
CELADONITE, LEADS TO ZONING IN VESICLES, RIMMED BY
REPLACED GLASS, PLEOCHROIC GREEN MINERAL PROBABLY
CELADONITE, BUT VERY REMINISCENT OF FE-PUMPPELLY*
Alteration - CLAY MINERALS ( 20%)
Location: MATRIX, Replacing: INTERSTITIAL GLASS
Location: INTERSTITIAL
Location: TO PLUMES
SMECTITE*
Leg : 89 Top/Bottom Interval(mm): 240/ 290 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1152.00 Rock Type: IGNEOUS
Core: 103 Sample Midpoint(m) : 1152.27 Sect/Pc #: 1/PCE 1C
ROCK = OL-PLAG-CPX SP PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, SP PHYRIC;
Phenocrysts- CLINOPYROXENE ( 2.9%)
PLAGIOCLASE ( 1.5%)
Groundmass - CLINOPYROXENE ( 49.8%)
PLAGIOCLASE ( 17.6%)
MAGNETITE ( 13.5%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 8.3%)
PALE YELLOW-BROWN, REPLACES INTERSTITIAL GLASS;
SMECTITE ( 6.5%)
REPLACING INTERSTITIAL GLASS*
Leg : 89 Top/Bottom Interval(mm): 600/ 610 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1152.00 Rock Type: IGNEOUS
Core: 103 Sample Midpoint(m) : 1152.60 Sect/Pc #: 1/PCE 2A
ROCK = PLAG-CPX-OL PHYRIC GLASSY BASALT
Texture: QUENCH, HYALOPILITIC, PHYRIC, GLASSY
Where sampled: GLASSY MARGIN, TOP OF UNIT 50*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.1-0.35 Morphology: SUBHEDRAL TO EUHEDRAL
REPLACED BY GOLDEN YELLOW SMECTITE AND OP.MINS;
PLAGIOCLASE ( 10%)
Size(mm): 0.1-0.2 Morphology: LATHS
APPROX COMP AN70-80, CARLSBAD AND POLYSYNTHETIC
TWINS, ZONING RARE, LATHS 1MM LONG;
CLINOPYROXENE ( 4%)
Size(mm): 0.1-0.2 Morphology: SUBHEDRAL
SOME GLOMEROCRYTIC CLUMPS, POSSIBLY EXSOLUTION
LAMELLAE*
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): 0.02-0.06 Morphology: QUENCH MICROLITES WITH
Morphology: SWALLOW-TAILS
CLINOPYROXENE ( 54%)
Size(mm): 0.1-0.5 Morphology: BROWN STELLATE AND RADIATE
Morphology: PLUMES
SIZE RANGE INDICATES DIAMETER OF SPHERULITES,
CPX FORMS MAJORITY OF MATRIX
MAGNETITE ( 25%)
Size(mm): 0.006 Morphology: GRANULES
OUTLINING CPX PLUMES AND SPHERULITES*
Alteration - CLAY MINERALS ( 2%)
Location: PHENOS Replacing: OL
Leg : 89 Top/Bottom Interval(mm): 740/ 750 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1152.00 Rock Type: IGNEOUS
Core: 103 Sample Midpoint(m) : 1152.74 Sect/Pc #: 1/PCE 3A
ROCK = PLAG-CPX-OL PHYRIC GLASSY BASALT
SIMILAR TO 462A-103-1 60-61CM, EXCEPT CPX
PLUMROSE GROUPS NOW COARSER AND COLORLESS,
ASSOCIATED WITH PLAG MICROLITES WHICH ARE MORE
NUMEROUS, "INTERGROWTH ASSOCIATION," BIGGER FE ORE
GRAINS STILL RIMMING PLUMES BUT NOT SCATTERED
THROUGHOUT ANY LONGER;
Texture: QUENCH, HYALOPILITIC, PHYRIC, GLASSY;
Where sampled: GLASSY MARGIN, TOP OF UNIT 50*
Leg : 89 Top/Bottom Interval(mm): 1070/1120 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1152.00 Rock Type: IGNEOUS
Core: 103 Sample Midpoint(m) : 1153.10 Sect/Pc #: 1/PCE 3E
ROCK = PLAG-CPX MOD PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH,VARIOLITIC, MOD PHYRIC;
Phenocrysts- CLINOPYROXENE ( 2.6%)
PLAGIOCLASE ( 2.2%)
Groundmass - CLINOPYROXENE ( 50.8%)
PLAGIOCLASE ( 23.3%)
MAGNETITE ( 7.5%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 8.6%)
GREENISH YELLOW, RIMMED BY SMEC*
SMECTITE ( 5.0%)
BROWN, RIMS PALAG AREAS*
Leg : 89 Top/Bottom Interval(mm): 400/ 440 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1161.20 Rock Type: IGNEOUS
Core: 104 Sample Midpoint(m) : 1161.62 Sect/Pc #: 1/PCE 4B
ROCK = CPX-PLAG-OL MOD PHYRIC BASALT
UNIT 50 OL VERY GRANULAR PHYRIC BASALT POSSIBLY
BASAL CHILLED ZONE, CONTACT HAS POSSIBLY META
PRODUCED GRANULAR TOP, ALSO VERY FINE-GRAINED
CHILLED ZONE BUT NO GLASS, INCLUDES OL+CPX+PLAG
PHENOS, UNIT 51 SHOWS INCREASE IN GRAIN-SIZE TO
OL-CPX-PLAG PHYRIC BASALT, GRAIN SHAPE CHANGES
FROM GRANULAR TO PRISMATIC, FE ORE GRAINS INCREASE
IN SIZE, NOTE THAT UNIT 51 FIRST CHILLED WITH
GLASSY ZONE RAPIDLY FOLLOWED BY UNIT 50 THAT
STRIPS GLASS AND INCORPORATES XENOLITHS, COOLS
SLOWLY AGAINST STILL HOT UNIT BELOW;
Texture: GRANULAR, MOD PHYRIC;
Where sampled: CHILLED ZONE, UNIT 50/51 JUNCTION*
Phenocrysts- OLIVINE ( 2%)
PLAGIOCLASE ( 2%)
CLINOPYROXENE ( 4%)
Groundmass - PLAGIOCLASE ( 40%)
CLINOPYROXENE ( 22%)
MAGNETITE ( 5%)
Alteration - CLAY MINERALS ( 25%)
Location: MATRIX, Replacing: ASSOCIATED WITH ORE, OL
Location: PHENOS
Leg : 89 Top/Bottom Interval(mm): 670/ 710 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1161.20 Rock Type: IGNEOUS
Core: 104 Sample Midpoint(m) : 1161.89 Sect/Pc #: 1/PCE 7A
ROCK = OL-PLAG-CPX MOD PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, SPHERULITIC, MOD PHYRIC;
Phenocrysts- CLINOPYROXENE ( 2.9%)
PLAGIOCLASE ( 3.0%)
OLIVINE
PRESENT ORIGINALLY, REPLACED BY SMEC*
Groundmass - CLINOPYROXENE ( 71.5%)
ALSO INCLUDES GLASS BETWEEN CRYSTALLITES;
PLAGIOCLASE ( 10.8%)
MAGNETITE ( 10.1%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - SMECTITE ( 1.8%)
REPLACES OL*
Leg : 89 Top/Bottom Interval(mm): 800/ 840 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1161.20 Rock Type: IGNEOUS
Core: 104 Sample Midpoint(m) : 1162.02 Sect/Pc #: 1/PCE 8A
ROCK = CPX-OL MOD PHYRIC GLASSY BASALT
PLAG MICROLITES AND PALE BROWN CPX PLUMROSE
SHEAVES MAKE UP MATRIX WITH SCATTERED MAGN
GRANULES, MICROLITES ARE CONED AND SKELETAL,
YELLOW SMECTITE REPLACED GLASS, LARGER CPX PRISMS
0.1MM ALSO IN MATRIX, LARGER PLAG LATHS REPLACED
BY YELLOW-BROWN SMECTITE IN CONES, CONES OF
DIFFERENT COMPOSITION AT RIMS;
Texture: QUENCH, HYALOPILITIC, MOD PHYRIC, GLASSY;
Where sampled: CHILLED ZONE NEXT TO GLASSY MARGIN WITHIN FLOW
UNIT 51*
Phenocrysts- OLIVINE ( 1%)
CLINOPYROXENE ( 3%)
Groundmass - PLAGIOCLASE ( 10%)
CLINOPYROXENE ( 51%)
PRISMS 8 PERCENT, VARIOLITES 43 PERCENT;
MAGNETITE ( 5%)
Alteration - CLAY MINERALS ( 30%)
Leg : 89 Top/Bottom Interval(mm): 810/ 850 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1161.20 Rock Type: IGNEOUS
Core: 104 Sample Midpoint(m) : 1162.03 Sect/Pc #: 1/PCE 8A
ROCK = PLAG-CPX-OL SP PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, VARIOLITIC, SP PHYRIC;
Phenocrysts- CLINOPYROXENE ( 0.9%)
PLAGIOCLASE ( 1.1%)
OLIVINE
PRESENT ORIGINALLY, POSSIBLY REPLACED BY SMEC*
Groundmass - CLINOPYROXENE ( 58.6%)
PLAGIOCLASE ( 17.2%)
MAGNETITE ( 6.0%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 11.7%)
SMECTITE ( 4.4%)
LIME-GREEN, REPLACES OL PHENOS, OL ID UNCERTAIN*
Leg : 89 Top/Bottom Interval(mm): 1260/1270 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1161.20 Rock Type: IGNEOUS
Core: 104 Sample Midpoint(m) : 1162.47 Sect/Pc #: 1/PCE 9C
ROCK = CPX-OL MOD PHYRIC GLASSY BASALT
SIMILAR TO 462A-104-1 80-84CM, MATRIX OF PLUMROSE
CPX, PLAG MICROLITES, FE ORE GRANULES, AGAIN
LARGER CPX PRISMS AND LARGER PLAG CONED WITH
BROWN SMECTITE AND SOME ANALCITE;
Texture: QUENCH, HYALOPILITIC, MOD PHYRIC, GLASSY;
Where sampled: UNIT 51*
Phenocrysts- OLIVINE ( 1%)
CLINOPYROXENE ( 3%)
Groundmass - PLAGIOCLASE ( 15%)
CLINOPYROXENE ( 46%)
MAGNETITE ( 10%)
Alteration - CLAY MINERALS ( 25%)
Leg : 89 Top/Bottom Interval(mm): 1280/1330 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1161.20 Rock Type: IGNEOUS
Core: 104 Sample Midpoint(m) : 1164.01 Sect/Pc #: 2/PCE 7
ROCK = CPX-PLAG MOD PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, VARIOLITIC, MOD PHYRIC;
Phenocrysts- CLINOPYROXENE ( 2.3%)
PLAGIOCLASE ( 1.6%)
PARTLY REPLACED BY SMEC AND RARE ANALCITE*
Groundmass - CLINOPYROXENE ( 56.8%)
PLAGIOCLASE ( 12.9%)
MAGNETITE ( 4.9%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 14.9%)
SMECTITE ( 6.5%)
GREEN, PARTLY REPLACING PLAG PHENOS*
Leg : 89 Top/Bottom Interval(mm): 30/ 40 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1170.30 Rock Type: IGNEOUS
Core: 105 Sample Midpoint(m) : 1170.33 Sect/Pc #: 1/PCE 1
ROCK = CPX-PLAG MOD GLOMEROPHYRIC GLASSY BASALT;
Texture: INTERSERTAL, MOD GLOMEROPHYRIC, GLASSY;
Where sampled: NEXT TO GLASSY MARGIN, BASE OF UNIT 51*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.4-0.6 Morphology: LATHS
APPROX COMP AN65, TWINNED, RARELY ZONED;
CLINOPYROXENE ( 4%)
Size(mm): 0.1-0.6 Morphology: SUBHEDRAL, GRANULAR
APPROX COMP AUGITE, SOME CONTAIN REPLACED
INCLUSIONS, SUBOPHITIC TO ASSOCIATED PLAG;
Groundmass - PLAGIOCLASE ( 48%)
Size(mm): 0.1-0.2 Morphology: LATHS
TWINNED MARGINAL SMECTITE REPLACEMENT;
CLINOPYROXENE ( 10%)
Size(mm): 0.05-0.1 Morphology: GRANULAR
OFTEN IN SMALL CLUSTERS OF GRAINS;
MAGNETITE ( 8%)
Size(mm): 0.05-0.15 Morphology: GRANULAR, SUBHEDRAL
POSSIBLY INTERGROWN WITH ANOTHER ORE, ORE BLACK,
OTHERS PURPLISH IN PLANE POLARIZED LIGHT;
GLASS
Morphology: INTERSTITIAL
ALL REPLACED;
PYRITE ( TR%)
AMPHIBOLE ( TR%)
Morphology: ACICULAR PRISMS
ASSOCIATED WITH PLAG*
Alteration - CLAY MINERALS ( 25%)
Location: MATRIX Replacing: INTERSTITIAL GLASS
YELLOW-BROWN TO DARK BROWN;
ZEOLITE ( <1%)
Location: MATRIX Replacing: PLAG
RADIATE CRYSTALS, SMECTITE*
Leg : 89 Top/Bottom Interval(mm): 110/ 120 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1170.30 Rock Type: IGNEOUS
Core: 105 Sample Midpoint(m) : 1170.42 Sect/Pc #: 1/PCE 2A
ROCK = CPX SP PHYRIC GLASSY BASALT;
Texture: PARTLY HYALOPILITIC, QUENCH, VARIOLITIC, GLASSY;
Where sampled: NEXT TO GLASSY MARGIN, TOP OF UNIT 52*
Phenocrysts- CLINOPYROXENE ( 1%)
Groundmass - OLIVINE ( TR%)
NOW RICH IN BROWN SMECTITE;
PLAGIOCLASE ( 34%)
APPROX COMP AN50-54, VARIOLES OF INTERGROWN PLAG
AND CPX OR STARS OF 2-3 PLAG MICROLITES, TWINNED
AND SOMETIMES CONED, IS ASSOCIATED WITH
INTERSTITIAL GLASS;
CLINOPYROXENE ( 25%)
PLUMES AND SHEAVES PENETRATING FE ORE-RICH GLASS,
HYALOPILITIC TEXTURE;
MAGNETITE ( 10%)
GLASS ( 30%)
INTERSTITIAL, GLASS IS NOW BRIGHT YELLOW PALAG
ALTERED TO YELLOW-BROWN AND DARK BROWN OPAQUE
SMEC AROUND MARGINS OF GLASS AND XTLS ENCLOSED
THEREIN, ALTERATION SMEC ZONE 0.01MM THICK, MOST
GLASS ALTERED TO BROWN SMEC OR DARK OPAQUE
MATERIAL*
Alteration - CLAY ( 25%)
Replacing: GLASS
PALAGONITE ( 5%)
Replacing: GLASS
YELLOW-BROWN*
Leg : 89 Top/Bottom Interval(mm): 520/ 560 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1170.30 Rock Type: IGNEOUS
Core: 105 Sample Midpoint(m) : 1170.84 Sect/Pc #: 1/PCE 3A
ROCK = PLAG-CPX MOD PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, VARIOLITIC, MOD PHYRIC,HYPOXTLLINE;
Phenocrysts- CLINOPYROXENE ( 2.9%)
PLAGIOCLASE ( 2.1%)
Groundmass - CLINOPYROXENE ( 42.9%)
Morphology: PLUMOSE,QUENCH
PLAGIOCLASE ( 21.2%)
MAGNETITE ( 10.1%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 18.8%)
SMECTITE ( 2.0%)
YELLOW, REPLACES INTERSTITIAL GLASS*
Leg : 89 Top/Bottom Interval(mm): 800/ 810 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1170.30 Rock Type: IGNEOUS
Core: 105 Sample Midpoint(m) : 1171.10 Sect/Pc #: 1/PCE 3E
ROCK = CPX-OL MOD PHYRIC GLASSY BASALT;
Texture: HYALOPILITIC, QUENCH, MOD PHYRIC, GLASSY;
Where sampled: FLOW INTERIOR, UNIT 52*
Phenocrysts- OLIVINE ( 1%)
REPLACED BY DARK RED-BROWN SMEC AND RARE CARB;
CLINOPYROXENE ( 2%)
NOT THAT GLOMEROPHYRIC HERE*
Groundmass - PLAGIOCLASE ( 10%)
APPROX COMP AN52-55, SWALLOW-TAILED, CONED SERRATE
MICROLITES, SOME VARIOLITIC GROWTHS, BUT RARELY
WITH CPX, PLAG IS EARLIER THAN CPX PLUMES;
CLINOPYROXENE ( 59%)
Morphology: GRANULES, PLUMES, SHEAVES
SOME XTLITES FROM MAJORITY OF MATRIX;
MAGNETITE ( 8%)
GLASS
REPLACED BY GOLDEN YELLOW SMEC, OFTEN CENTRAL
PORTION OF YELLOW PALAG RETAINED, MATRIX IN
GENERAL HAS PLUMES OF CPX, INTERSTITIAL GLASS,
FE ORE, PLAG MICROLITES*
Alteration - CARBONATE ( TR%)
Location: MATRIX Replacing: OL PHENOS
CLAY ( 20%)
Location: MATRIX Replacing: GLASS, OL PHENOS
Leg : 89 Top/Bottom Interval(mm): 980/1020 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1170.30 Rock Type: IGNEOUS
Core: 105 Sample Midpoint(m) : 1171.30 Sect/Pc #: 1/PCE 4A
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, VARIOLITIC, APHYRIC;
Phenocrysts- CLINOPYROXENE ( 0.2%)
PLAGIOCLASE ( 0.7%)
Groundmass - CLINOPYROXENE ( 41.6%)
PLAGIOCLASE ( 28.5%)
MAGNETITE ( 7.9%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 16.2%)
PALAGONITIZED INTERSTITIAL GLASS CROWDED WITH
CRYSTALLITES;
SMECTITE ( 4.8%)
Leg : 89 Top/Bottom Interval(mm): 40/ 50 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1170.30 Rock Type: IGNEOUS
Core: 105 Sample Midpoint(m) : 1171.85 Sect/Pc #: 2/PCE 1A
ROCK = APHYRIC GLASSY BASALT;
Texture: INTERSERTAL, IN SMALL PART VARIOLITIC;
Where sampled: FLOW INTERIOR, UNIT 52*
Groundmass - OLIVINE ( TR%)
PLAGIOCLASE ( 45%)
CLINOPYROXENE ( 30%)
MAGNETITE ( 10%)
SKELETAL-LOOKING DARK MAGN THAT IS OFTEN ELONGATE
CHAINS OF GRANULES SHOWS UNDER DIRECT REFLECTED
LIGHT TO BE ONLY PARTLY MAGN, THE REST MAY BE SMEC
COATING OR REPLACEMENT, CLOUDY OPAQUE MATERIAL;
GLASS ( 15%)
TWO TYPES OF GLASS AREAS, FIRST IS DARK CLOUDY
GRANULAR AREA CONTAINING SMALL QUENCH XTLS OF
SKELETAL FE ORE, PLAG MICROLITES AND PLUMROSE CPX
PLUS YELLOW-BROWN LIMITED SMEC, WHOLE MAY BE CUT
BY ELONGATED CURVED PLAG MICROLITES AND LATHS
LATER QUENCHED, MAJORITY OF NOW XTLINE LIQUID HAS
QUENCHED-TEXTURED MATRIX, SECOND TYPE OF GLASS
AREA IS INTERSTITIAL WITH OR WITHOUT MORE GRANULAR
AND LARGER FE ORE GRAINS, COLORED MARGINALLY BROWN
SMEC WITH OCCASIONAL CONE OF YELLOW PALAG*
Leg : 89 Top/Bottom Interval(mm): 580/ 630 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1170.30 Rock Type: IGNEOUS
Core: 105 Sample Midpoint(m) : 1172.40 Sect/Pc #: 2/
ROCK = APHYRIC BASALT
SOURCE IS IR;
Texture: APHYRIC, COARSE-GRAINED,HYPOCRYSTALLINE*
Groundmass - PLAGIOCLASE
Morphology: SKELETAL,ELONGATE
GLASS
INTERSTITAL*
Alteration - SMECTITE
Replacing: GLASS
PALAGONITE
Replacing: GLASS
Leg : 89 Top/Bottom Interval(mm): 210/ 220 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1174.30 Rock Type: IGNEOUS
Core: 106 Sample Midpoint(m) : 1174.52 Sect/Pc #: 1/PCE 1C
ROCK = APHYRIC GLASSY BASALT;
Texture: INTERSERTAL, IN PART VARIOLITIC, APHYRIC, GLASSY;
Where sampled: FLOW INTERIOR, UNIT 52*
Groundmass - PLAGIOCLASE ( 50%)
APPROX COMP AN52-55, QUENCH TEXTURED LONG AND
CURVING SERRATED PLAG MICROLITES, SOMETIMES
VARIOLITICALLY ASSOCIATED WITH CPX, MORE LATH
SHAPED ONES ALSO;
CLINOPYROXENE ( 30%)
GRANULAR BETWEEN LONG PLAG XTLS;
MAGNETITE ( 10%)
GLASS ( 10%)
SMALL INTERSTITIAL AREAS REPLACED BY YELLOW-BROWN
FIBERS OF SMEC+OP.MINS, THE REPLACED TEXTURED FE
ORE IS ALSO ASSOCIATED WITH THESE AREAS*
Leg : 89 Top/Bottom Interval(mm): 1290/1330 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1174.30 Rock Type: IGNEOUS
Core: 106 Sample Midpoint(m) : 1175.61 Sect/Pc #: 1/PCE 1K
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, APHYRIC;
Groundmass - CLINOPYROXENE ( 43.7%)
PLAGIOCLASE ( 31.9%)
ZEOLITE NEEDLES AND BLUE-GREEN CELAD IN PLAG
LATHS;
MAGNETITE ( 7.6%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - ZEOLITE ( 14.3%)
NEEDLES IN PLAG LATHS;
CARBONATE ( 2.4%)
Leg : 89 Top/Bottom Interval(mm): 1470/1480 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1174.30 Rock Type: IGNEOUS
Core: 106 Sample Midpoint(m) : 1177.28 Sect/Pc #: 2/PCE 3F
ROCK = APHYRIC GLASSY BASALT;
AS 462A-106-2 3-4CM, GLASS MINIMAL, COAXIAL
PLEOCHROIC GREEN AND BROWN FIBERS WITH STRAIGHT
EXTINCTION IN GLASS AREAS, POSSIBLY SMEC, PLAG
PARTIALLY REPLACED BY SIMILAR MATERIAL EXCEPT
MORE GRANULAR ESPECIALLY IN CONES, PATCHY K-FELD
REPLACEMENT OF FEW RARE LATHS;
Texture: VARIOLITIC IN PART, INTERSERTAL, APHYRIC, GLASSY;
Where sampled: FLOW INTERIOR, UNIT 52*
Groundmass - PLAGIOCLASE ( 45%)
APPROX COMP AN55-60;
CLINOPYROXENE ( 40%)
MAGNETITE ( 10%)
GLASS ( 5%)
Leg : 89 Top/Bottom Interval(mm): 30/ 40 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1174.30 Rock Type: IGNEOUS
Core: 106 Sample Midpoint(m) : 1177.33 Sect/Pc #: 3/PCE 1A
ROCK = APHYRIC FINE-GRAINED DOLERITE;
SIMILAR TO 462A-106-2 147-148 EXCEPT MARGINALLY
COARSER-GRAINED, STILL VARIOLITIC PLAG-CPX GROUPS
EXCEPT CPX BECOMING LARGER GRAINED ANHEDRAL, BOTH
PLAG AND CPX PARTIALLY REPLACED, ESPECIALLY BY
FIBROUS MATERIAL, SOME MAY BE AMPHIBOLE, HAS
EXTINCTION 20-25;
Texture: POORLY VARIOLITIC, APHYRIC;
Where sampled: FLOW INTERIOR, UNIT 52*
MORE ALTERED THAN ANY IN UNIT 52*
Leg : 89 Top/Bottom Interval(mm): 40/ 80 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1174.30 Rock Type: IGNEOUS
Core: 106 Sample Midpoint(m) : 1177.36 Sect/Pc #: 3/PCE 1A
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: VARIOLITIC, GRANULAR, APHYRIC;
Groundmass - CLINOPYROXENE ( 38.1%)
PLAGIOCLASE ( 35.8%)
BRIGHT GREEN CELAD AND LATE K-FELD REPLACE PLAG;
MAGNETITE ( 6.5%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - SMECTITE ( 19.1%)
COMP INCLUDES ONE PERCENT CELAD, REPLACES PLAG;
ZEOLITE ( 0.6%)
Leg : 89 Top/Bottom Interval(mm): 100/ 110 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1189.60 Sect/Pc #: 1/PCE 2A
ROCK = APHYRIC FINE-GRAINED DOLERITE;
Texture: GRANULAR
FEW PLAG-CPX VARIOLES, SIMILAR TO 462A-106-3
3-4CM, COARSER THAN THE BASIC ROCKS IN THE PILE
BUT NO OPHITIC RELATIONSHIP, SOME VARIOLITIC
TEXTURE STILL, MAJORITY OF ROCK WITH GRANULAR CPX
AND SHORT PLAG PRISMS, BOTH BROWNISH TO OPAQUE
ALTERATION PATCHES, POSSIBLY SMEC GRAINS, NOT
APPARENTLY REPLACING INTESTITIAL GLASS, PLAG
PARTIALLY REPLACED BY SMEC, SOME COLORLESS TO PALE
GREEN ACICULAR PRISMS, SOME STRAIGHT EXTINCTION,
SOME INCLINED EXTINCTION, VERY SMALL, IN THESE
AREAS ALSO ZEOLITE OR AMPHIBOLE, NOT CORRECT
BIREFRINGENCE FOR AMPHIBOLE HOWEVER;
Where sampled: FLOW INTERIOR, UNIT 52*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.2-0.8
APPROX COMP AN47-54;
CLINOPYROXENE ( 20%)
Size(mm): 0.1-1.0 Morphology: SOME SKELETAL PRISMS
MAGNETITE ( 5%)
Size(mm): 0.05-0.2
REPLACED BY OPAQUE CLAY*
Alteration - CLAY MINERALS ( 35%)
REPLACES MAGN*
Leg : 89 Top/Bottom Interval(mm): 790/ 840 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1190.32 Sect/Pc #: 1/PCE 2F
ROCK = APHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: VARIOLITIC, APHYRIC;
Groundmass - CLINOPYROXENE ( 40.7%)
OPAQUE SMEC ASSOCIATED WITH MAGN AND CPX RIMS;
PLAGIOCLASE ( 38.3%)
MAGNETITE ( 7.9%)
OPAQUE SMEC ASSOCIATED WITH MAGN AND CPX RIMS;
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( TR%)
SMECTITE ( 11.3%)
OPAQUE, ASSOCIATED WITH MAGN AND CPX RIMS;
ZEOLITE ( 1.8%)
Leg : 89 Top/Bottom Interval(mm): 170/ 220 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1191.20 Sect/Pc #: 2/
ROCK = APHYRIC BASALT
SOURCE IS IR;
Texture: APHYRIC, COARSE-GRAINED,HOLOXTLLINE*
Groundmass - PLAGIOCLASE
PLAG ALTERATION DOMAINS WITH KSPAR AND ZEOL;
KFELDSPAR
Alteration - ZEOLITE
Leg : 89 Top/Bottom Interval(mm): 550/ 560 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1191.56 Sect/Pc #: 2/PCE 1F
ROCK = CPX-PLAG SP PHYRIC GLASSY BASALT;
Texture: GRANULAR, SP PHYRIC, GLASSY;
Where sampled: NEAR BASE OF FLOW UNIT 52*
Phenocrysts- PLAGIOCLASE ( <1%)
Size(mm): 0.4-0.6
CLINOPYROXENE ( 1%)
Size(mm): 0.1-0.2
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.05-0.15 Morphology: LATHS, SOME SKELETAL, VERY
Morphology: OCCATIONALLY VARIOLITIC,
Morphology: BOWTIE;
APPROX COMP AN60-63;
CLINOPYROXENE ( 40%)
Size(mm): 0.02-0.05 Morphology: GRANULAR
LATER GROWTH THAN PLAG POSSIBLY REXTLIZED;
MAGNETITE ( 8%)
Size(mm): 0.05-0.10 Morphology: CORRODED GRAINS, FEW SKELETAL
POSSIBLY REPLACED BY CLAY;
GLASS
REPLACED BY CLAYS;
PYRITE ( TR%)
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS, FE ORE, PLAG
Location: AREAS
GENERALLY DARK AND OPAQUE AND ASSOCIATED WITH FE
ORE, PALER AREAS ARE RED-BROWN ZONED SMEC WITH
RARE CONES OF BROWNISH PALAG*
Leg : 89 Top/Bottom Interval(mm): 660/ 670 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1191.67 Sect/Pc #: 2/PCE 2A
ROCK = CPX SP PHYRIC GLASSY BASALT;
Texture: HYALOPILITIC, QUENCH, SP PHYRIC, GLASSY;
Where sampled: NEXT TO GLASSY MARGIN BASE OF UNIT 52*
Phenocrysts- OLIVINE ( TR%)
SOME SMEC AND CALCITE AREAS MIGHT BE PSUEDOMORPHS
AFTER OL;
CLINOPYROXENE ( 2%)
Size(mm): 0.2-0.45 Morphology: CORRODED SUBHEDRAL AND
Morphology: ANHEDRAL PRISMS
APPROX COMP AUGITE, PRISMS ARE POORLY DEFINED
GLOMEROPHYRIC CLUMPS*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.1-0.2 Morphology: LATHS OR SKELETAL, CONED
SOMETIMES VARIOLITIC BUT RARELY WITH CPX;
CLINOPYROXENE ( 40%)
Size(mm): 0.2-0.5 Morphology: PLUMROSE, SHEAF LIKE TO
Morphology: GRANULAR
10 PERCENT ARE GRANULAR, 30 PERCENT ARE PLUMES;
MAGNETITE ( 8%)
Morphology: SKELETAL AND CORRODED BY CLAY
GLASS
REPLACED*
Alteration - CLAY MINERALS ( 30%)
Location: INTERSTITIAL, Replacing: GLASS, PLAG CONES
Location: MATRIX
YELLOW-BROWN GRANULAR SMEC AND CALCITE, ASSOCIATED
WITH FE ORE*
Leg : 89 Top/Bottom Interval(mm): 740/ 750 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1191.74 Sect/Pc #: 2/PCE 2B
ROCK = CPX MOD PHYRIC GLASSY BASALT
SIMILAR TO 462A-108-2 66-67, EXCEPT DIFFERENT
UNIT, LACK OF PLAG PHENOS, ALSO MORE QUENCH
TEXTURE WITH PLUMROSE AREAS, STILL XTLITES
ONLY OCCATIONALLY ARE THEY IDENTIFIED AS CPX,
NO CPX GRANULES, PLAG IS LESS AND ONLY SCATTERED
MICROLITES, NON-VARIOLITIC, LESS GLASSY AREAS;
Texture: HYALOPILITIC, QUENCH, NON-VARIOLITIC;
Where sampled: NEXT TO GLASSY MARGIN, TOP OF UNIT 53*
Phenocrysts- CLINOPYROXENE ( 3%)
Groundmass - PLAGIOCLASE ( 15%)
Morphology: MICROLITES
APPROX COMP AN56, LARGER LATHS OF PLAG HAVE CONES
REPLACED BY BROWN SMEC;
CLINOPYROXENE ( 45%)
MAGNETITE ( 2%)
Alteration - CLAY MINERALS ( 35%)
Leg : 89 Top/Bottom Interval(mm): 1080/1090 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1192.09 Sect/Pc #: 2/PCE 3A
ROCK = CPX-PLAG MOD PHYRIC GLASSY BASALT;
Texture: VARIOLITIC, MOD PHYRIC, GLASSY;
Where sampled: NEAR FLOW TOP, UNIT 53*
Phenocrysts- OLIVINE ( TR%)
ID UNCERTAIN;
PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.4 Morphology: LATHS
ONE LARGE ZONED PHENO 1MM WITH CONE REPLACED BY
BROWN SMEC, OCCASSIONALLY ASSOCIATED IN
GLOMEROPHYRIC CLUMPS;
CLINOPYROXENE ( 3%)
Size(mm): 0.2-0.4 Morphology: TWINNED
OCASSIONALLY ASSOCIATED IN GLOMEROPHYRIC CLUMPS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.05-0.1
CLINOPYROXENE ( 41%)
Morphology: GRANULAR, PLUMROSE WITHIN
Morphology: VARIOLES WITH PLAG
GRANULAR PARTS 0.02-0.05MM, PLUMES 0.1-0.3MM;
MAGNETITE ( 5%)
Size(mm): 0.02-0.05 Morphology: SKELETAL, GRANULAR
OFTEN CONCENTRATED IN GLASSY AREAS;
GLASS
REPLACED*
Alteration - CLAY MINERALS ( 20%)
Location: INTERSTITIAL Replacing: GLASS, PLAG CONES
YELLOW-BROWN GRANULAR SMEC AND DARK OPAQUE
MATERIAL*
Leg : 89 Top/Bottom Interval(mm): 1250/1280 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1192.27 Sect/Pc #: 2/PCE 4
ROCK = PLAG-CPX SP PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: GRANULAR, PHYRIC;
Phenocrysts- CLINOPYROXENE ( 0.5%)
PLAGIOCLASE ( 0.4%)
RECORDED SMEC LARGELY REPLACING PLAG PHENOS*
Groundmass - CLINOPYROXENE ( 42.0%)
PLAGIOCLASE ( 21.9%)
MAGNETITE ( 11.4%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 17.8%)
SMECTITE ( 5.9%)
LARGELY REPLACING PLAG PHENOS*
Leg : 89 Top/Bottom Interval(mm): 260/ 270 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1192.77 Sect/Pc #: 3/PCE 2B
ROCK = CPX-PLAG MOD GLOMEROPHYRIC GLASSY BASALT;
Texture: HYALOPILITIC, QUENCH, GLASSY
LOCALLY VARIOLITIC WITH SKELETAL PLAG;
Where sampled: NEAR TOP OF UNIT 54*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.4
APPROX COMP AN64, SINGLE PHENOS ARE TWINNED AND
REPLACED BY BROWN SMEC;
CLINOPYROXENE ( 5%)
Size(mm): 0.1-0.3
APPROX COMP AUGITE, GLOMEROPHYRIC CLUMPS OF
ANHEDRAL CPX AND SOME OF LARGE SKELETAL PALAG,
HALF BOWTIES*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.05-0.1 Morphology: MICOLITES
APPROX COMP AN50-53;
CLINOPYROXENE ( 46%)
Size(mm): 0.1-0.5 Morphology: PLUMES, SHEAVES
MOSTLY PLUMES AND SHEAVES OF QUENCHED CPX,
SOMETIMES APPEAR TO NUCLEATE ON A CONE OF MORE
GRANULAR MATERIAL;
MAGNETITE ( 8%)
Size(mm): 0.01-0.03 Morphology: GRANULES
GLASS
REPLACED, FE ORE ASSOCIATED AREAS*
Alteration - CLAY MINERALS ( 25%)
Location: INTERSTITIAL Replacing: GLASS, SOME PLAG
GOLDEN-BROWN TO DARK BROWN AND OPAQUE SMEC,
POSSIBLY REPLACING FE ORE ALSO*
Leg : 89 Top/Bottom Interval(mm): 750/ 780 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1189.50 Rock Type: IGNEOUS
Core: 108 Sample Midpoint(m) : 1193.27 Sect/Pc #: 3/PCE 3E
ROCK = PLAG-CPX MOD PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: GRANULAR, MOD PHYRIC,GLOMEROPHYRIC,
HYPOCRYSTALLINE;
Phenocrysts- CLINOPYROXENE ( 4.2%)
PLAGIOCLASE ( 0.4%)
GREENISH SMEC REPLACES PLAG PHENOS*
Groundmass - CLINOPYROXENE ( 43.9%)
PLAGIOCLASE ( 18.3%)
MAGNETITE ( 9.2%)
INTERSTITAL GLASS CROWDED BY MAGN GRANULES,
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 3.2%)
Replacing: GLASS
SMECTITE ( 20.9%)
GREEN REPLACES PLAG PHENOS, BROWN REPLACES GLASS*
Leg : 89 Top/Bottom Interval(mm): 1000/1030 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1198.70 Rock Type: IGNEOUS
Core: 109 Sample Midpoint(m) : 1199.72 Sect/Pc #: 1/PCE 8
ROCK = CPX-PLAG MOD PHYRIC GLASSY BASALT;
Texture: POORLY VARIOLITIC, MOD PHYRIC, GLASSY;
Where sampled: NEAR GLASSY MARGIN, UNIT 55*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): 0.3-0.5 Morphology: LATHS
OFTEN ASSOCIATED IN SUBOPHITIC GLOMEROPHYRIC
GROUPS, ZONED PLAG LATH TOTALLY ENCLOSES CPX
XTL REPLACED WITH OPAQUE MATERIAL;
CLINOPYROXENE ( 5%)
Size(mm): 0.1-0.4 Morphology: ANHEDRAL
OFTEN ASSOCIATED IN SUBOPHITIC GLOMEROPHYRIC
GROUPS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.05-0.2
APPROX COMP AN55, VARIOLITIC ASSOCIATED OR
INDIVIDUAL LATHS AND GRAINS RESPECTIVELY;
CLINOPYROXENE ( 40%)
Size(mm): 0.02-0.1
VARIOLITIC ASSOCIATED OR INDIVIDUAL LATHS AND
GRAINS RESPECTIVELY;
MAGNETITE ( 10%)
POSSIBLY REPLACED BY CLAY*
Alteration - CLAY MINERALS ( 14%)
Location: MATRIX Replacing: INTERSTITIAL GLASS
BROWN SMEC*
Leg : 89 Top/Bottom Interval(mm): 390/ 430 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1198.70 Rock Type: IGNEOUS
Core: 109 Sample Midpoint(m) : 1200.61 Sect/Pc #: 2/PCE 2B
ROCK = PLAG-CPX SP PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: GRANULAR, SP PHYRIC;
Phenocrysts- CLINOPYROXENE ( 0.9%)
PLAGIOCLASE ( 0.7%)
Groundmass - CLINOPYROXENE ( 40.7%)
PLAGIOCLASE ( 33.2%)
MAGNETITE ( 7.7%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 12.9%)
SMECTITE ( 3.9%)
GRANULAR, BROWNISH, REPLACES INTERSTITIAL GLASS;
CARBONATE ( TR%)
Leg : 89 Top/Bottom Interval(mm): 1450/1480 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1198.70 Rock Type: IGNEOUS
Core: 109 Sample Midpoint(m) : 1201.67 Sect/Pc #: 2/PCE 7
ROCK = CPX-PLAG MOD PHYRIC GLASSY BASALT;
DOMINATED BY LARGE GOLDEN-YELLOW, REDDISH-BROWN
TO OPAQUE DARK BROWN AREAS COMPOSED OF
SPHERULITIC STRUCTURES OF SMEC, DARK SMEC IN
CENTERS, LIGHTER IN MARGINS, APPEAR TO REPLACE
MATRIX AS RELIC XTLINE MATERIAL SEEN WITHIN MASS,
INDIVIDUAL FIBROUS RADIATE GROUPS ARE GOLDEN
YELLOW IN CENTER AND WHERE THEY COALSCE ARE
DIVIDED BY DARK OPAQUE ZONES, IN THINNER PART
OF THIN SECTION SOME OF THE BETTER XTLIZED SMEC
IS PLEOCHROIC AND HAS GREENISH FIBERS IN CENTER OF
ALTERED AREAS AND HAS XLTIZED INTO A SPACE,
COULD BE PATCHES OR VUGS;
Texture: SUBVARIOLITIC, GRANULAR, MOD PHYRIC, GLASSY;
Where sampled: TOWARD FLOW BASE, UNIT 55*
Phenocrysts- PLAGIOCLASE ( 2%)
Morphology: GLOMEROPHYRIC OR SEPERATE
Morphology: INDIVIDUALS
CLINOPYROXENE ( 8%)
Morphology: GLOMEROPHYRIC OR SEPERATE
Morphology: INDIVIDUALS
SOMETIMES EUHEDRAL BUT ROUNDED AND CORRODED, OFTEN
FILLED WITH CENTRAL IRREGULAR INCLUSIONS, SOME MAY
BE GLASS BUT REPLACED BY SMEC, EUHEDRAL XTLS ALSO
PRESENT ARE PINK-GREEN PLEOCHROIC WITH STRAIGHT
EXTINCTION, POSSIBLY OPX*
Groundmass - PLAGIOCLASE ( 30%)
CLINOPYROXENE ( 20%)
MAGNETITE ( 8%)
Vesicles -
Size(mm): POSSIBLY
Percent: VUGY
Location: *
Alteration - CLAY MINERALS ( 32%)
Location: RANDOM PATCHY Replacing: REPLACEMENT OF MATRIX
Leg : 89 Top/Bottom Interval(mm): 1120/1160 Describer: Floyd, P.
Hole: 462A Top of Core Depth(m) : 1198.70 Rock Type: IGNEOUS
Core: 109 Sample Midpoint(m) : 1202.84 Sect/Pc #: 3/
ROCK = PLAG-CPX MOD PHYRIC BASALT
SOURCE IS INITIAL REPORTS;
Texture: QUENCH, MOD PHYRIC*
Phenocrysts- CLINOPYROXENE ( 4.9%)
PLAGIOCLASE ( 2.7%)
MICROPHENOS, REPLACED BY GREEN SMEC OR CELAD
FLAKES*
Groundmass - CLINOPYROXENE ( 40.8%)
PLAGIOCLASE ( 17.6%)
MAGNETITE ( 10.1%)
PERCENTAGES OBTAINED BY POINT COUNT*
Alteration - PALAGONITE ( 17.6%)
SMECTITE ( 6.4%)
GREEN, REPLACES PLAG MICROPHENOS*
|
