Leg : 51 Top/Bottom Interval(mm): 1070/ 0 Describer: Juteau, T.
Hole: 417A Top of Core Depth(m) : 198.50 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 199.57 Sect/Pc #: 1/PCE 1
ROCK = PLAG-OL PHYRIC BASALT
ALTERED;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: FRAGMENT*
Phenocrysts- OLIVINE ( 2-5%)
Size(mm): 1-2 Morphology: IDIOMORPHIC
PLAGIOCLASE ( 10%)
Size(mm): <3 Morphology: IDIOMORPHIC
OSCILLATORY ZONING,APPROX COMP AN65,ALTERED*
Groundmass - OLIVINE
Morphology: SKELETAL
POSSIBLE PSEUDOMORPHS;
PLAGIOCLASE ( 15%)
Size(mm): 0.03-1 Morphology: LATH MICROLITES
MANY MICROLITES ARE SKELETAL,APPROX COMP AN33;
CLINOPYROXENE ( 5-10%)
Morphology: PLUMOSE
POSSIBLE PSEUDOMORPHS AFTER CPX;
GLASS ( 50%)
ALTERED;
HEMATITE (10-20%)
IDENTITY UNCERTAIN FOR HEMATITE*
Alteration - IDDINGSITE
Replacing: OLIVINE
CLAY MINERALS
Replacing: PLAG
ZEOLITE
Replacing: PLAG
ANALCITE
Replacing: PLAG
SMECTITE
Replacing: DEVITRIFIED GLASS
Vesicles -
Size(mm): 0.05-0.5
Percent: 1
Filling: SMECTITE AND/OR
Shape: ROUND,SOME
Filling: CELAD
Shape: COMPOUND
Leg : 51 Top/Bottom Interval(mm): 1230/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 198.50 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 199.73 Sect/Pc #: 1/
ROCK = PLAG-OL-CPX PHYRIC BASALT
ALTERED;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: FRAGMENT*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 0.5-3.0
APPROX COMP AN>50;
OLIVINE ( 1-2%)
Size(mm): .3-.8 Morphology: IDIOMORPHIC
CLINOPYROXENE ( <1%)
Size(mm): 0.1-0.3
NOW ALTERED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .1-.5 Morphology: LATH MICROLITES
COMMONLY SKELETAL;
CLINOPYROXENE (25-30%)
Size(mm): .2-.7 Morphology: PLUMOSE
PSEUDOMORPHS;
GLASS (30-40%)
Alteration - CLAY MINERALS
Replacing: PLAG PHENOS
ZEOLITE
Replacing: PLAG PHENOS
IDENTITY UNCERTAIN FOR ZEOLITE;
SMECTITE
Replacing: CPX,OL
OPAQUE MINERALS
Replacing: OL
PALAGONITE
Replacing: DEVITRIFIED GLASS
IDENTITY UNCERTAIN FOR PALAG*
Vesicles -
Size(mm): 0.2
Percent: <1
Location: RANDOM
Filling: SMECTITE AND/OR
Shape: ROUND
Filling: CELAD
Leg : 51 Top/Bottom Interval(mm): 760/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 217.50 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 218.26 Sect/Pc #: 1/PCE 6A
ROCK = PLAG PHYRIC BASALT
EXTENSIVELY ALTERED;
Texture: PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE (10-15%)
ALTERED*
Groundmass - CLAY MINERALS ( 65%)
INCLUDES CLAY+SMECTITE;
MAGNETITE (10-15%)
Alteration - CLAY MINERALS
Replacing: PLAG PHENOS
KFELDSPAR
Replacing: PLAG PHENOS
ZEOLITE
Replacing: PLAG PHENOS
IDENTITY UNCERTAIN FOR ZEOLITE;
CLAY MINERALS
Replacing: DEVITRIFIED GLASS
Vesicles -
Percent: 2-3
Filling: CALCITE,CELAD
Leg : 51 Top/Bottom Interval(mm): 1410/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 236.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 237.91 Sect/Pc #: 1/PCE 12B
ROCK = PLAG-SPARSELY PHYRIC BASALT
SLIGHTLY ALTERED,PILLOW BASALT;
Texture: HYALOPILITIC,SPARSELY PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .5 Morphology: EUHEDRAL;
ZONED,APPROX COMP AN>40,ALTERED*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): .3 Morphology: LATHS
OCCASIONALLY SKELETAL;
CLINOPYROXENE (20-25%)
Size(mm): .1 Morphology: PRISMATIC
COLORLESS;
MAGNETITE (20-25%)
Size(mm): .2 Morphology: IDIOMORPHIC
PROBABLY TITANOMAGNETITE;
GLASS ( 10%)
ALTERED*
Alteration - CALCITE ( TR%)
Location: VEINS, Replacing: PLAG
Location: GROUNDMASS
CLAY MINERALS
Location: VEINS Replacing: PLAG
ZEOLITE
Location: VEINS Replacing: PLAG
PALAGONITE
Replacing: GLASS
CELADONITE ( 10%)
Location: GROUNDMASS, Replacing: GLASS
Location: VEINS
Vesicles -
Size(mm): .3
Percent: 1-2
Location: RANDOM
Filling: CALCITE,
Shape: ROUND
Filling: SMECTITE,CELAD
SMECTITE IS MINOR*
Leg : 51 Top/Bottom Interval(mm): 600/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 236.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 238.60 Sect/Pc #: 2/PCE 3
ROCK = PLAG SPARSELY PHYRIC BASALT
SLIGHTLY ALTERED,PILLOW BASALT;
Texture: HYALOPILITIC,SPARSELY PORPHYRITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): .2-.6 Morphology: EUHEDRAL LATHS
MICROPHENOCRYSTS*
Groundmass - PLAGIOCLASE (25-30%)
Size(mm): .1 Morphology: MICROLITES,LATHS
MAGNETITE ( 10%)
Size(mm): <.1
SOME MAY BE ILMENITE;
GLASS (60-65%)
DEVITRIFIED*
Alteration - PALAGONITE
Replacing: DEVITRIFIED GLASS
ZEOLITE
Replacing: DEVITRIFIED GLASS
CELADONITE
Replacing: DEVITRIFIED GLASS
Vesicles -
Size(mm): .2
Percent: <1
Filling: CELAD
Shape: ROUND
Leg : 51 Top/Bottom Interval(mm): 290/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 236.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 242.79 Sect/Pc #: 5/PCE 5
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 10%)
Size(mm): 1 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): 3 Morphology: EUHEDRAL
MOSTLY ALTERED;
CLINOPYROXENE ( 2%)
Size(mm): 1 Morphology: EUHEDRAL
ALTERED*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): .2 Morphology: TABULAR,EUHEDRAL
GLASS ( >70%)
ALTERED*
Alteration - KFELDSPAR
Replacing: PLAG
CLAY
Replacing: PLAG
SMECTITE
Replacing: CPX
SMECTITE
Replacing: OL PHENOS
IDDINGSITE
Replacing: OL PHENOS
IDENTITY UNCERTAIN FOR IDDINGSITE*
Vesicles -
Percent: <1
Filling: SMECTITE
Shape: ROUND
Leg : 51 Top/Bottom Interval(mm): 1190/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 246.00 Rock Type: IGNEOUS
Core: 27 Sample Midpoint(m) : 247.19 Sect/Pc #: 1/PCE 15
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): .5 Morphology: EUHEDRAL
IDENTITY UNCERTAIN FOR OL,ALTERED;
PLAGIOCLASE ( 5-10%)
Size(mm): 3 Morphology: EUHEDRAL
PARTLY ALTERED;
CLINOPYROXENE ( 1-2%)
Size(mm): 1 Morphology: EUHEDRAL
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .4 Morphology: TABULAR
LONG;
CLINOPYROXENE ( 10%)
Size(mm): <.1 Morphology: GRANULAR
PARTIALLY ALTERED;
GLASS ( 60%)
DEVITRIFIED*
Alteration - CALCITE
Replacing: PLAG
ALBITE
Replacing: PLAG
ALBITE OR KSPAR;
CLAY MINERALS
Replacing: OL,CPX
Leg : 51 Top/Bottom Interval(mm): 1230/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 255.50 Rock Type: UNIDENTIFIED
Core: 28 Sample Midpoint(m) : 258.23 Sect/Pc #: 2/PCE 12
ROCK = BASALTIC BRECCIA;
Texture: BRECCIA;
Where sampled: VOLCANIC BRECCIA MATRIX*
Groundmass - COMBINATION ( 70%)
INCLUDES PALAG+SMECTITE;
ORTHOCLASE ( 10%)
APPROX COMP OR85,2V(-) 50;
LIMONITE ( 5-10%)
HEMATITE ( 5-7%)
CALCITE ( 5%)
Alteration - ORTHOCLASE ( 10%)
Location: GROUNDMASS Replacing: PLAG
Leg : 51 Top/Bottom Interval(mm): 700/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 255.50 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 259.20 Sect/Pc #: 3/PCE 1B
ROCK = PLAG-OL PHYRIC BASALT
MODERATELY ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .5 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-3 Morphology: EUHEDRAL
RIMS REPLACED BY KSPAR+ADULARIA OR ALBITE AND
CORES REPLACED BY CLAY*
Groundmass - OLIVINE ( 1%)
Size(mm): .2
PLAGIOCLASE ( 35%)
Size(mm): .5 Morphology: LATHS
APPROX COMP AN40;
CLINOPYROXENE (20-25%)
FRESH TO ALTERED;
MAGNETITE (10-15%)
ALTERED;
GLASS ( 5%)
DEVITRIFIED;
CALCITE
Alteration - CLAY MINERALS
Replacing: PLAG
KFELDSPAR
Replacing: PLAG
SMECTITE
Replacing: OL,GLASS
PALAGONITE
Replacing: GLASS
CELADONITE ( <1%)
Location: GROUNDMASS Replacing: GLASS
Leg : 51 Top/Bottom Interval(mm): 180/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 255.50 Rock Type: IGNEOUS
Core: 28 Sample Midpoint(m) : 261.68 Sect/Pc #: 5/PCE 1
ROCK = PLAG-CPX-OL BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 1 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): 5 Morphology: EUHEDRAL
PARTIALLY ALTERED;
CLINOPYROXENE ( 1%)
Size(mm): 1 Morphology: EUHEDRAL
COMPLETELY ALTERED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .5 Morphology: TABULAR,EUHEDRAL
CLINOPYROXENE ( 5%)
Size(mm): .2 Morphology: GRANULAR
GLASS (50-60%)
DEVITRIFIED GLASS*
Alteration - CALCITE
Replacing: PLAG PHENOS
CLAY
Replacing: PLAG PHENOS
SMECTITE
Replacing: OL PHENOS
SMECTITE
Replacing: CPX PHENOS
Leg : 51 Top/Bottom Interval(mm): 730/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 265.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 265.73 Sect/Pc #: 1/PCE 5
ROCK = PLAG PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,SUB-OPHITIC
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE (15-20%)
Size(mm): 1-6 Morphology: EUHEDRAL,SOME ELONGATE
APPROX COMP AN53-63,ZONED*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 1.5 Morphology: LATHS
APPROX COMP AN45-50,OCCASIONALLY SKELETAL;
CLINOPYROXENE ( 25%)
2V 55;
MAGNETITE ( 15%)
CELADONITE ( 2%)
IN VEINS;
CALCITE ( 1%)
IN VEINS*
Alteration - CLAY ( 1-2%)
Replacing: PLAG
KFELDSPAR ( 1%)
Replacing: PLAG
Leg : 51 Top/Bottom Interval(mm): 50/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 265.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 268.05 Sect/Pc #: 3/PCE 1
ROCK = PLAG PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): 1-4 Morphology: EUHEDRAL
APPROX COMP AN60,OSCILLATORY ZONING,CORES
OCCASIONALLY CONTAIN HIGH REFRACTIVE INDEX
INCLUSIONS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .1-1 Morphology: LATHS
APPROX COMP AN45;
CLINOPYROXENE (25-30%)
Size(mm): .1 Morphology: PRISMS
POSSIBLY AUGITE,PRISMS ARE STUBBY,2V>+40;
MAGNETITE ( 15%)
Size(mm): TO.2 Morphology: OCTAHEDRAL DENDRITE
CALCITE ( 2%)
THIN VEINS AND PATCHES;
COMBINATION ( 1%)
INCLUDES CELAD+SMECTITE*
Alteration - CALCITE ( 1-2%)
Replacing: PLAG
CLAY ( 2%)
Replacing: PLAG
Vesicles -
Percent: 1
Filling: GLAUCONITE
Shape: IRREGULAR
Leg : 51 Top/Bottom Interval(mm): 1350/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 265.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 269.35 Sect/Pc #: 3/PCE 7
ROCK = PLAG-CPX-OL BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: CHILLED MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 1 Morphology: EUHEDRAL
PLAGIOCLASE ( 15%)
Size(mm): 4 Morphology: EUHEDRAL
APPROX COMP AN68 OR GREATER;
CLINOPYROXENE ( 5%)
Size(mm): 2 Morphology: EUHEDRAL*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .2 Morphology: TABULAR
CLINOPYROXENE ( 10%)
Size(mm): .1 Morphology: GRANULAR,SUBHEDRAL
MAGNETITE ( 2%)
Size(mm): .01 Morphology: EUHEDRAL,DENORITIC
GLASS ( 50%)
DEVITRIFIED*
Alteration - CALCITE
Replacing: PLAG PHENOS
CLAY
Replacing: PLAG PHENOS
SMECTITE
Replacing: CPX PHENOS
CALCITE
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 340/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 265.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 272.84 Sect/Pc #: 6/PCE 1B
ROCK = PLAG-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC-INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .3 Morphology: EUHEDRAL
PLAGIOCLASE ( 10%)
Size(mm): .3-4 Morphology: EUHEDRAL
ZONED,PARTIALLY ALTERED*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .5 Morphology: TABULAR
CLINOPYROXENE ( 30%)
Size(mm): .2 Morphology: GRANULAR-SUBHEDRAL
MAGNETITE ( 2%)
Size(mm): .01 Morphology: DENDRITIC
GLASS ( 30%)
DEVITRIFIED*
Alteration - CLAY
Replacing: PLAG PHENOS
CALCITE
Replacing: PLAG,OL
IDDINGSITE
Replacing: OL PHENOS
GROUNDMASS HEMATIZED;
SMECTITE
Replacing: CPX
Vesicles -
Size(mm): .1
Percent: 1
Filling: CLAY
Shape: ROUND
Leg : 51 Top/Bottom Interval(mm): 1280/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 265.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 273.78 Sect/Pc #: 6/PCE 2B
ROCK = OL-PLAG-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC-INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 10%)
Size(mm): .5 Morphology: EUHEDRAL
PLAGIOCLASE ( 5%)
Size(mm): 1 Morphology: EUHEDRAL
MOSTLY ALTERED;
CLINOPYROXENE ( 2%)
Size(mm): .5 Morphology: EUHEDRAL
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .3 Morphology: TABULAR,EUHEDRAL
MOSTLY FRESH;
CLINOPYROXENE ( 30%)
Size(mm): .1 Morphology: GRANULAR,SUBHEDRAL
PARTIALLY FRESH;
MAGNETITE ( 5%)
Size(mm): .03 Morphology: EUHEDRAL
GLASS ( 30%)
DEVITRIFIED*
Alteration - CALCITE
Replacing: PLAG,CPX
CLAY
Replacing: PLAG PHENOS
HEMATITE
Replacing: PLAG,GROUNDMASS
IDENTITY UNCERTAIN FOR HEMATITE;
SMECTITE
Replacing: CPX.PHENOS
IDDINGSITE
Replacing: OL
GROUNDMASS HEMATIZED*
Vesicles -
Percent: TR
Filling: CALCITE
Leg : 51 Top/Bottom Interval(mm): 430/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 274.50 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 280.93 Sect/Pc #: 5/PCE 3
ROCK = PLAG-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3-5%)
Size(mm): .7
COMPLETELY REPLACED;
PLAGIOCLASE ( 15%)
Size(mm): 6 Morphology: EUHEDRAL
2V 38*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): .5 Morphology: LATHS
APPROX COMP AN60;
MAGNETITE ( 5%)
GLASS (50-60%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: PLAG PHENOS
KFELDSPAR
Replacing: PLAG PHENOS
CELADONITE
Replacing: OL PHENOS
IDENTITY UNCERTAIN FOR CELAD;
SMECTITE
Replacing: GLASS
PALAGONITE
Replacing: GLASS
CELADONITE
Replacing: GLASS
IDENTITY UNCERTAIN FOR CELAD*
Vesicles -
Size(mm): 1-1.5
Percent: 5-8
Filling: SMECTITE+CELAD
Shape: ROUND-
Shape: IRREGULAR
Leg : 51 Top/Bottom Interval(mm): 630/ 0 Describer: Juteau, T.
Hole: 417A Top of Core Depth(m) : 274.50 Rock Type: IGNEOUS
Core: 30 Sample Midpoint(m) : 281.13 Sect/Pc #: 5/PCE 5
ROCK = PLAG-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .5-1 Morphology: IDIOMORPHIC
PLAGIOCLASE ( 10%)
Size(mm): 3-5 Morphology: IDIOMORPHIC
SECOND SIZE RANGE OF 0.3-1.3MM*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .1-.3 Morphology: MICROLITES
GLASS ( 40%)
ALTERED,OPAQUE BLACK-BROWN GROUNDMASS;
MAGNETITE ( TR%)
HEMATITE ( TR%)
Alteration - CLAY MINERALS ( 80%)
Replacing: PLAG PHENOS
ANALCITE ( 20%)
Replacing: PLAG PHENOS
SMECTITE
Replacing: OL PHENOS
IDDINGSITE
Replacing: OL PHENOS
Vesicles -
Size(mm): .5
Percent: 1-2
Filling: SMECTITE
Shape: ROUND,OFTEN
Shape: COALESCED
Leg : 51 Top/Bottom Interval(mm): 90/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 284.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 284.09 Sect/Pc #: 1/PCE 1A
ROCK = PLAG PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,LOCALLY PILOTAXITIC;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- PLAGIOCLASE (15-20%)
Size(mm): .5-2.5
Groundmass - PLAGIOCLASE (35-45%)
Size(mm): .4
CLINOPYROXENE ( 30%)
Size(mm): .05-.1
MAGNETITE ( 10%)
Size(mm): .05-.1
SMECTITE ( 5%)
Alteration - CALCITE
Replacing: PLAG PHENOS
CLAY MINERALS
Replacing: PLAG PHENOS
ZEOLITE
Replacing: PLAG PHENOS
IDENTITY UNCERTAIN FOR ZEOLITE;
KFELDSPAR
Replacing: PLAG PHENOS
SMECTITE
Replacing: OL
IDENTITY UNCERTAIN FOR OL*
Vesicles -
Size(mm): 1-2
Percent: 1-2
Filling: CELAD,CALCITE
CALCITE CORE,CELADONITE RIM*
Leg : 51 Top/Bottom Interval(mm): 1180/ 0 Describer: Rusinov, V.
Hole: 417A Top of Core Depth(m) : 284.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 288.18 Sect/Pc #: 3/PCE 12B
ROCK = PLAG-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): .5-1 Morphology: TABULAR
ZONED WITH AN82 CORE AND AN72 RIM,ALTERED;
CLINOPYROXENE ( 3%)
Size(mm): .3-.5 Morphology: PRISMATIC
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): .1-.2 Morphology: TABULAR
APPROX COMP AN60
CLINOPYROXENE ( 2%)
Size(mm): .1 Morphology: PRISMATIC
ALTERED;
GLASS ( 75%)
DEVITRIFIED*
Alteration - MONTMORILLONITE ( 40%)
Replacing: PLAG,CPX
PSEUDOMORPHS,CPX ALTERED COMPLETELY TO MONT;
ZEOLITE ( 5-10%)
Replacing: PLAG
PSEUDOMORPHS*
Vesicles -
Size(mm): .2-.4
Percent: 3
Filling: SMECTITE
Shape: IRREGULAR
Leg : 51 Top/Bottom Interval(mm): 1400/ 0 Describer: Rusinov, V.
Hole: 417A Top of Core Depth(m) : 284.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 288.40 Sect/Pc #: 3/PCE 13
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .2 Morphology: EUHEDRAL
PLAGIOCLASE ( 15%)
Size(mm): 1-3 Morphology: TABULAR
CLINOPYROXENE ( <1%)
Size(mm): .5 Morphology: PRISMATIC
2V 60*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): .1-.2 Morphology: TABULAR
APPROX COMP AN60;
CLINOPYROXENE ( 15%)
Size(mm): .1-.2 Morphology: ANHEDRAL
GLASS ( 50%)
DEVITRIFIED*
Alteration - MONTMORILLONITE ( 10%)
Replacing: PLAG PHENOS
PSEUDOMORPHS;
ZEOLITE ( <5%)
Replacing: PLAG PHENOS
PSEUDOMORPHS;
SMECTITE ( 5%)
Replacing: OL PHENOS
PSEUDOMORPHS,SMECTITE ALSO IN GROUNDMASS AND IN
VEINS WITH CALCITE,OL PHENOS ALTERED COMPLETELY TO
SMECTITE*
Vesicles -
Size(mm): .2-.5
Percent: 2
Filling: SMECTITE
Shape: ROUND-
Shape: IRREGULAR
Leg : 51 Top/Bottom Interval(mm): 100/ 0 Describer: Rusinov, V.
Hole: 417A Top of Core Depth(m) : 284.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 288.60 Sect/Pc #: 4/PCE 1
ROCK = PLAG-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 2-5 Morphology: TABULAR
CLINOPYROXENE ( 1%)
Size(mm): 1 Morphology: PRISMATIC
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .2 Morphology: TABULAR
CLINOPYROXENE ( 10%)
Size(mm): .1 Morphology: ANHEDRAL
MAGNETITE ( 5%)
Size(mm): .2 Morphology: ANHEDRAL
GLASS ( 55%)
ALTERED TO OPAQUE BROWN SUBSTANCE*
Alteration - CALCITE ( 10%)
Location: INTERSTITIAL Replacing: PLAG PHENOS
PSEUDOMORPHS;
CLAY MINERALS ( 5%)
Replacing: PLAG PHENOS
PSEUDOMORPHS;
CALCITE ( 10%)
Location: INTERSTITIAL Replacing: CPX MICROLITES
PSEUDOMORPHS;
LEUCOXENE ( 5%)
Location: IRREGULAR Replacing: MAGN
Location: INCLUSIONS IN
Location: GROUNDMASS
GROUNDMASS HEMATIZED,CONTAINS DISSEMINATED
CALCITE*
Leg : 51 Top/Bottom Interval(mm): 130/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 284.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 288.63 Sect/Pc #: 4/PCE 1
ROCK = PLAG-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): .8
PLAGIOCLASE (10-15%)
Size(mm): TO 4
APPROX COMP AN70-75*
Groundmass - OLIVINE (10-15%)
Size(mm): .1
PLAGIOCLASE (20-25%)
Size(mm): .2-.3
APPROX COMP AN40;
CLINOPYROXENE ( 20%)
Size(mm): .05
MAGNETITE (15-20%)
Size(mm): .01
Alteration - CELADONITE
Replacing: OL
SMECTITE
Replacing: OL
CALCITE
Replacing: PLAG PHENOS
CLAY MINERALS
Replacing: PLAG PHENOS
Vesicles -
Size(mm): TO 1
Percent: 1-2
Filling: CELAD+CALCITE
Filling: OR SMECTITE
Leg : 51 Top/Bottom Interval(mm): 1240/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 284.00 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 291.24 Sect/Pc #: 5/PCE 3C
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .5 Morphology: EUHEDRAL
PLAGIOCLASE ( 15%)
Size(mm): .5-4 Morphology: EUHEDRAL
CLINOPYROXENE ( 3%)
Size(mm): 1 Morphology: EUHEDRAL
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): .1 Morphology: TABULAR
CLINOPYROXENE ( 30%)
Size(mm): .05 Morphology: GRANULAR,SUBHEDRAL
MAGNETITE ( 10%)
Size(mm): .01 Morphology: DENDRITIC,EUHEDRAL
GLASS ( 20%)
DEVITRIFIED*
Alteration - IDDINGSITE
Replacing: OL PHENOS
IDENTITY UNCERTAIN FOR IDDINGSITE;
CALCITE
Location: GROUNDMASS, Replacing: PLAG PHENOS,CPX PHENOS
Location: PHENOS
GROUNDMASS CONTAINS DISSEMINATED CALCITE;
CLAY MINERALS
Replacing: PLAG,CPX
Vesicles -
Size(mm): .01
Percent: 1
Filling: CLAY.MINS
Leg : 51 Top/Bottom Interval(mm): 370/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 293.50 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 293.87 Sect/Pc #: 1/PCE 2B
ROCK = PLAG-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1-2%)
IDENTITY UNCERTAIN FOR OL;
PLAGIOCLASE ( 20%)
Size(mm): TO 3
Groundmass - OLIVINE ( 5%)
Size(mm): .05
PLAGIOCLASE ( 15%)
Size(mm): .2
APPROX COMP AN55,OFTEN SKELETAL;
CLINOPYROXENE ( 10%)
MAGNETITE (15-20%)
GLASS
DEVITRIFIED,ALTERED;
CALCITE ( <1%)
IN VEINS*
Alteration - CELADONITE
Replacing: OL,GLASS
ID UNCERTAIN FOR CELAD;
SMECTITE
Replacing: OL
CLAY MINERALS
Replacing: PLAG,GLASS
Vesicles -
Percent: TO 1
Filling: CELAD+CLAY.MINS
Filling: OR SMECTITE OR
Filling: CALCITE
Size(mm): * SOME F
Percent: INE P
Location: RISMATIC XTLS
Filling: WITH RI > GLUE
Shape: > CELAD*
Leg : 51 Top/Bottom Interval(mm): 1040/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 293.50 Rock Type: IGNEOUS
Core: 32 Sample Midpoint(m) : 297.54 Sect/Pc #: 3/PCE 7A
ROCK = PLAG-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 1 Morphology: EUHEDRAL
ALTERED COMPLETELY;
PLAGIOCLASE ( 15%)
Size(mm): 4 Morphology: EUHEDRAL
PARTIALLY FRESH*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .1 Morphology: TABULAR
CLINOPYROXENE ( 30%)
COMPLETELY ALTERED;
GLASS ( 30%)
DEVITRIFIED*
Alteration - CALCITE
Replacing: PLAG PHENOS
CLAY MINERALS
Location: PHENOS, Replacing: PLAG,GLASS
Location: GROUNDMASS
Vesicles -
Size(mm): .1
Percent: <1
Filling: CLAY.MINS
Shape: ROUND
Leg : 51 Top/Bottom Interval(mm): 270/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 303.00 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 303.27 Sect/Pc #: 1/PCE 2
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 1 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): .5-3 Morphology: EUHEDRAL
PARTIALLY ALTERED;
CLINOPYROXENE ( 5%)
Size(mm): 2 Morphology: EUHEDRAL
COMPLETELY ALTERED*
Groundmass - PLAGIOCLASE ( 20%)
Morphology: TABULAR
COMBINATION ( 40%)
INCLUDES DEVITRIFIED GLASS AND POSSIBLY ALTERED OL
AND ALTERED CPX;
MAGNETITE ( 10%)
Morphology: DENDRITIC,ANHEDRAL,EUHEDRAL
Alteration - CLAY MINERALS
Replacing: OL,CPX,PLAG PHENOS
CALCITE
Location: VEINS Replacing: OL,CPX,PLAG PHENOS
ZEOLITE
Location: VEINS
Vesicles -
Size(mm): .5
Percent: TR
Filling: CLAY.MINS
Leg : 51 Top/Bottom Interval(mm): 850/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 303.00 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 306.85 Sect/Pc #: 3/PCE 8
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 3 Morphology: SUBHEDRAL-EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-4 Morphology: EUHEDRAL
ZONED,RELATIVELY FRESH;
CLINOPYROXENE ( 2%)
Size(mm): 2 Morphology: EUHEDRAL
COMPLETELY ALTERED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .2 Morphology: TABULAR,EUHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): <.1 Morphology: ANHEDRAL-SUBHEDRAL
MAGNETITE ( 5%)
Size(mm): .01 Morphology: EUHEDRAL,DENDRITIC
GLASS ( 10%)
ALTERED*
Alteration - CALCITE
Replacing: OL,CPX
CLAY MINERALS
Replacing: OL,GLASS,CPX
SMECTITE
Replacing: OL PHENOS
ZEOLITE
Replacing: GLASS.
Vesicles -
Size(mm): .5-.8
Percent: TR
Filling: CLAY.MINS
Leg : 51 Top/Bottom Interval(mm): 840/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 303.00 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 309.84 Sect/Pc #: 5/PCE 5B
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC,PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 1 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 4 Morphology: EUHEDRAL
PARTIALLY ALTERED;
CLINOPYROXENE ( <5%)
Size(mm): 2 Morphology: EUHEDRAL-SUBHEDRAL
MOST GRAINS ALTERED-SOME FRESH*
Groundmass - OLIVINE ( 10%)
Size(mm): .05 Morphology: EUHEDRAL-SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): .2 Morphology: TABULAR,EUHEDRAL
CLINOPYROXENE ( 25%)
Size(mm): .05 Morphology: GRANULAR-SUBHEDRAL
RELATIVELY FRESH;
MAGNETITE ( 5%)
Size(mm): .02 Morphology: DENDRITIC
GLASS ( <10%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: CPX,OL,GLASS
SMECTITE
Location: VEINS,PHENOS Replacing: CPX PHENOS
CALCITE
Location: VEINS
Vesicles -
Size(mm): .2-.6
Percent: TR
Filling: CLAY,SMECTITE
Shape: ROUND
Leg : 51 Top/Bottom Interval(mm): 920/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 303.00 Rock Type: IGNEOUS
Core: 33 Sample Midpoint(m) : 309.92 Sect/Pc #: 5/PCE 5C
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): .5 Morphology: EUHEDRAL
COMPLETELY ALTERED TO IDDINGSITE AND CLAY MINS;
PLAGIOCLASE ( 20%)
Size(mm): .5-4 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 5%)
Size(mm): 3 Morphology: EUHEDRAL-SUBHEDRAL
MOSTLY ALTERED,ONE FRESH GRAIN*
Groundmass - OLIVINE ( 10%)
Size(mm): .02
COMPLETELY ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): .2 Morphology: TABULAR,EUHEDRAL
MAGNETITE ( 5%)
Size(mm): <.01 Morphology: DENDRITIC
CLINOPYROXENE ( 20%)
Size(mm): .02 Morphology: GRANULAR
MOSTLY ALTERED;
GLASS ( 10%)
DEVITRIFIED*
Alteration - IDDINGSITE
Replacing: OL
CLAY MINERALS
Replacing: OL,GLASS
SMECTITE
Replacing: OL,CPX PHENOS
CALCITE
Replacing: PLAG PHENOS
Leg : 51 Top/Bottom Interval(mm): 120/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 312.50 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 315.62 Sect/Pc #: 3/PCE 1
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,VARIOLITIC
GROUNDMASS GRADES FROM GLASSY TO CRYSTALLINE PART;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( 3%)
Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-5 Morphology: EUHEDRAL-ANHEDRAL
CLINOPYROXENE ( 1%)
Morphology: ANHEDRAL
ALTERED*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .1 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): .1 Morphology: ANHEDRAL-SUBHEDRAL
MAGNETITE ( 10%)
Size(mm): .01 Morphology: EUHEDRAL,DENDRITIC
GLASS ( 5-50%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: OL,CPX
Vesicles -
Size(mm): .2
Percent: TR
Filling: CLAY.MIN
Shape: ROUND
Leg : 51 Top/Bottom Interval(mm): 420/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 312.50 Rock Type: IGNEOUS
Core: 34 Sample Midpoint(m) : 318.92 Sect/Pc #: 5/PCE 3
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): .5-1 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-3 Morphology: EUHEDRAL
PARTIALLY ALTERED TO CLAY;
CLINOPYROXENE ( 5%)
Size(mm): .5-2 Morphology: EUHEDRAL
ALTERED*
Groundmass - OLIVINE ( <10%)
Size(mm): .1
PLAGIOCLASE ( 20%)
Size(mm): .3 Morphology: TABULAR
CLINOPYROXENE ( 30%)
Size(mm): .1 Morphology: GRANULAR,SUBHEDRAL-ANHEDRAL
MAGNETITE ( 10%)
Size(mm): .05 Morphology: PRISMATIC
Alteration - CLAY MINERALS
Replacing: PLAG
SMECTITE
Replacing: CPX
Leg : 51 Top/Bottom Interval(mm): 1270/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 322.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 323.27 Sect/Pc #: 1/PCE 10A
ROCK = PLAG-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): TO 6 Morphology: GLOMEROPORPHYRITIC
APPROX COMP AN70;
CLINOPYROXENE ( 2-3%)
Size(mm): 5 Morphology: ELONGATE
AUGITIC,2V 50-55*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): .5
APPROX COMP AN53;
CLINOPYROXENE ( 45%)
MAGNETITE (10-15%)
CALCITE ( 1%)
IN VEINS*
Alteration - CALCITE
Location: VEINS,VESICLE Replacing: PLAG
Vesicles -
Size(mm): .8
Percent: 2-3
Filling: CALCITE
Leg : 51 Top/Bottom Interval(mm): 1020/ 0 Describer: Rusinov, V.
Hole: 417A Top of Core Depth(m) : 322.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 327.52 Sect/Pc #: 4/PCE 7
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 2 Morphology: ANHEDRAL
1 GRAIN;
PLAGIOCLASE ( 15%)
Size(mm): .5-5 Morphology: TABULAR
PARTLY ALTERED,ZONED,APPROX COMP 76-84,BYTOWNITE;
CLINOPYROXENE ( 1%)
Size(mm): .3-2 Morphology: PRISMATIC
Groundmass - PLAGIOCLASE ( 2-3%)
Size(mm): <.1 Morphology: TABULAR
APPROX COMP AN48;
CLINOPYROXENE ( <2%)
Size(mm): .1 Morphology: PRISMATIC
ALTERED;
GLASS ( 80%)
ALTERED,DARK BROWN,ALMOST OPAQUE*
Alteration - MONTMORILLONITE ( 7%)
Replacing: PLAG,CPX
ZEOLITE ( 3%)
Replacing: PLAG
Vesicles -
Size(mm): .1-.2
Percent: 2
Location: GROUNDMASS
Filling: SMECTITE
Shape: ROUND
FILLING IS ZONED-OPAQUE CORE*
Leg : 51 Top/Bottom Interval(mm): 1120/ 0 Describer: Rusinov, V.
Hole: 417A Top of Core Depth(m) : 322.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 327.62 Sect/Pc #: 4/PCE 7
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): .2-.5 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): .3-1.5 Morphology: TABULAR
LIQUID INCLUSIONS PARTLY REPLACED BY MICA-
MONTMORILLONITE;
CLINOPYROXENE ( 2%)
Size(mm): .1-1 Morphology: PRISMATIC
FRESH*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): .1-.5 Morphology: TABULAR
APPROX COMP AN 50-55
CLINOPYROXENE ( 3-5%)
Size(mm): .1 Morphology: ANHEDRAL
PARTLY REPLACED BY SMECTITE AND CHLORITE;
GLASS ( 60%)
ALTERED*
Alteration - CALCITE ( 7%)
Location: VESICLES, Replacing: PLAG,CPX
Location: PSEUDOMORPHS
MONTMORILLONITE ( 10%)
Location: MATRIX, Replacing: PLAG,OL,GLASS
Location: PSEUDOMORPHS
SMECTITE ( 3%)
Location: VESICLES, Replacing: CPX
Location: VEINS,
Location: PSEUDOMORPHS
Leg : 51 Top/Bottom Interval(mm): 1300/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 331.50 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 332.80 Sect/Pc #: 1/PCE 9
ROCK = PLAG-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOPILITIC-INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1-3%)
Size(mm): .9
MICROPHENOS COMPLETELY REPLACED;
PLAGIOCLASE ( 10%)
Size(mm): TO 3
APPROX COMP AN 70,PARTIALLY REPLACED*
Groundmass - OLIVINE ( 5-10%)
Size(mm): .1
COMPLETELY ALTERED;
PLAGIOCLASE (15-20%)
Size(mm): .3
APPROX COMP AN 53,OCCASIONALLY SKELETAL;
CLINOPYROXENE (20-25%)
Size(mm): .1
QUENCHED,LOCALLY SKELETAL WITH LADDER STRUCTURES;
MAGNETITE (10-15%)
GLASS (20-25%)
DEVITRIFIED*
Alteration - CALCITE
Replacing: PLAG
CLAY MINERALS
Replacing: PLAG,OL,GLASS
ZEOLITE
Replacing: PLAG
SMECTITE
Replacing: OL,GLASS
CELADONITE
Replacing: OL
Vesicles -
Percent: 1-2
Filling: CALCITE,
Shape: ROUND
Filling: SAPONITE
IDENTITY UNCERTAIN FOR SAPONITE*
Leg : 51 Top/Bottom Interval(mm): 640/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 331.50 Rock Type: IGNEOUS
Core: 36 Sample Midpoint(m) : 335.14 Sect/Pc #: 3/PCE 5
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 2 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 3 Morphology: EUHEDRAL
PARTIALLY ALTERED;
CLINOPYROXENE ( 5%)
ALTERED*
Groundmass - OLIVINE ( <5%)
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): .4 Morphology: TABULAR
CLINOPYROXENE ( 20%)
Size(mm): .1 Morphology: ANHEDRAL,GRANULAR
MAGNETITE ( 5%)
Size(mm): .03 Morphology: EUHEDRAL,PRISMATIC
GLASS ( <15%)
ALTERED*
Alteration - CALCITE
Replacing: OL,CPX
ZEOLITE
Replacing: OL
SMECTITE
Replacing: OL,CPX
CLAY MINERALS
Replacing: PLAG
Vesicles -
Size(mm): .1
Percent: TR
Filling: SMECTITE
Shape: ROUND
Leg : 51 Top/Bottom Interval(mm): 320/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 341.00 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 341.32 Sect/Pc #: 1/PCE 1A
ROCK = CPX-PLAG-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): .3-1 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-3 Morphology: EUHEDRAL-ANHEDRAL
CLINOPYROXENE ( 5%)
Size(mm): 1-2 Morphology: EUHEDRAL-SUBHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): .1 Morphology: ANHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): .1 Morphology: TABULAR,EUHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): .5 Morphology: ANHEDRAL
MAGNETITE ( 5%)
Size(mm): .02 Morphology: EUHEDRAL
GLASS ( 5%)
ALTERED*
Alteration - SMECTITE
Replacing: OL,GLASS
CARBONATE
Replacing: GROUNDMASS
GROUNDMASS CONTAINS DISSEMINATED CALCITE*
Leg : 51 Top/Bottom Interval(mm): 720/ 0 Describer: Juteau, T.
Hole: 417A Top of Core Depth(m) : 341.00 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 344.72 Sect/Pc #: 3/PCE 1B
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC, HYALOPILITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2-3%)
Size(mm): .5-4 Morphology: IDIOMORPHIC
PSEUDOMORPHS;
PLAGIOCLASE ( 10%)
Size(mm): .7-4 Morphology: IDIOMORPHIC
ZONED,ALTERED;
CLINOPYROXENE ( 1-2%)
Size(mm): 1 Morphology: IDIOMORPHIC
FRESH,OCCASIONAL TWINNING*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .1-.3 Morphology: MICROLITIC,SKELETAL
CLINOPYROXENE ( 5%)
Morphology: PLUMOSE
OPAQUE MINERALS ( 30%)
INCLUDES MAGNETITE+HEMATITE;
CPX,MAGN AND HEMATITE INTERSTITIAL BETWEEN PLAG
MICROLITES*
Alteration - CALCITE
Replacing: PLAG,OL
CLAY MINERALS
Location: IN PHENOS Replacing: PLAG PHENOS
RADIAL AGGREGATES IN PHENOS;
ANALCITE
Replacing: PLAG
IDDINGSITE
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 950/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 341.00 Rock Type: IGNEOUS
Core: 37 Sample Midpoint(m) : 347.95 Sect/Pc #: 5/PCE 4
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): .5-2 Morphology: EUHEDRAL
PLAGIOCLASE ( 20%)
Size(mm): 6 Morphology: EUHEDRAL
CLINOPYROXENE ( 5%)
Size(mm): 1 Morphology: EUHEDRAL
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): .2 Morphology: TABULAR,SKELETAL
CLINOPYROXENE ( 1%)
Size(mm): .1 Morphology: TABULAR
POSSIBLY OL,ALTERED;
GLASS ( 60%)
DEVITRIFIED*
Alteration - IDDINGSITE
Replacing: OL PHENOS
CALCITE
Replacing: CPX PHENOS
SMECTITE
Location: GROUNDMASS Replacing: OL,CPX
Vesicles -
Size(mm): .05
Percent: TR
Filling: SMECTITE
Leg : 51 Top/Bottom Interval(mm): 850/ 0 Describer: Sinton, J.
Hole: 417A Top of Core Depth(m) : 348.50 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 349.35 Sect/Pc #: 1/PCE 11A
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOPILITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): .4
PLAGIOCLASE ( 20%)
Size(mm): 5.5
APPROX COMP AN65;
CLINOPYROXENE ( 3-5%)
Size(mm): 2.5
TWINNED,2V>45*
Groundmass - OLIVINE ( 5-10%)
Size(mm): .05
PLAGIOCLASE (15-20%)
Size(mm): .4
APPROX COMP AN60,OFTEN SKELETAL;
CLINOPYROXENE ( 15%)
Size(mm): .03
MAGNETITE ( 5-10%)
GLASS ( 25%)
DEVITRIFIED;
Alteration - CALCITE
Location: VEINS,PHENOS Replacing: PLAG
IDDINGSITE
Replacing: OL
SMECTITE
Replacing: OL
CELADONITE
Replacing: OL
OL COMPLETELY REPLACED*
Vesicles -
Size(mm): .4
Percent: 1-5
Filling: CALCITE
Leg : 51 Top/Bottom Interval(mm): 470/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 348.50 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 351.97 Sect/Pc #: 3/PCE 1B
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 1 Morphology: EUHEDRAL-SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-3 Morphology: EUHEDRAL
ZONED;
CLINOPYROXENE ( 3%)
Size(mm): 3 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): .2 Morphology: TABULAR,EUHEDRAL
CLINOPYROXENE ( 20%)
Size(mm): .1 Morphology: GRANULAR-TABULAR
MAGNETITE ( 5%)
Morphology: DENDRITIC
GLASS ( 5%)
DEVITRIFIED*
Alteration - SMECTITE
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 1230/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 348.50 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 355.73 Sect/Pc #: 5/PCE 7B
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 2 Morphology: EUHEDRAL
PLAGIOCLASE ( 20%)
Size(mm): 1-4 Morphology: EUHEDRAL
CLINOPYROXENE ( 3%)
Size(mm): 1 Morphology: EUHEDRAL
Groundmass - OLIVINE ( <10%)
PLAGIOCLASE ( 30%)
Size(mm): .2 Morphology: TABULAR
CLINOPYROXENE ( 20%)
Size(mm): .05 Morphology: GRANULAR
MAGNETITE ( 5%)
Size(mm): .02
GLASS ( <5%)
DEVITRIFIED*
Alteration - CALCITE
Replacing: OL PHENOS
Leg : 51 Top/Bottom Interval(mm): 370/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 348.50 Rock Type: IGNEOUS
Core: 38 Sample Midpoint(m) : 357.87 Sect/Pc #: 7/PCE 3
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 2 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): 3 Morphology: EUHEDRAL
PARTIALLY ALTERED;
CLINOPYROXENE ( 10%)
Size(mm): 2 Morphology: EUHEDRAL
PARTIALLY ALTERED;
Groundmass - OLIVINE ( 10%)
Size(mm): .1 Morphology: EUHEDRAL
PLAGIOCLASE ( 30%)
Size(mm): .3 Morphology: TABULAR,EUHEDRAL
CLINOPYROXENE ( 25%)
Size(mm): .1 Morphology: ANHEDRAL
MAGNETITE ( 5%)
Size(mm): .02 Morphology: DENDRITIC-EUHEDRAL
GLASS ( <5%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: PLAG PHENOS
SMECTITE
Replacing: OL
IDDINGSITE
Location: GROUNDMASS Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 380/ 0 Describer: Juteau, T.
Hole: 417A Top of Core Depth(m) : 357.36 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 357.74 Sect/Pc #: 1/PCE 3A
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1-2%)
Size(mm): .5-4 Morphology: IDIOMORPHIC
PSEUDOMORPHS;
PLAGIOCLASE ( 10%)
Size(mm): .8-2.5 Morphology: IDIOMORPHIC
STRONGLY ALTERED;
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .2-.5 Morphology: MICROLITES
ALTERED;
CLINOPYROXENE ( 15%)
Size(mm): 0.2-0.4
FRESH,AUGITIC,INTERSERTAL BETWEEN MICROLITES;
MAGNETITE ( 5%)
MICROCRYST GROUNDMASS ( 15%)
INCLUDES SMECTITE+CALCITE+HEMATITE+MAGN,
UNDIFFERENTIATED ALTERED GROUNDMASS*
Alteration - CALCITE
Replacing: OL
SMECTITE
Location: GROUNDMASS
HEMATITE
Location: GROUNDMASS
Vesicles -
Size(mm): <1
Percent: <1
Filling: CALCITE
Leg : 51 Top/Bottom Interval(mm): 1110/ 0 Describer: Juteau, T.
Hole: 417A Top of Core Depth(m) : 357.36 Rock Type: IGNEOUS
Core: 39 Sample Midpoint(m) : 361.47 Sect/Pc #: 3/PCE 9
ROCK = PLAG-OL PHYRIC BASALT*
SLIGHTLY ALTERED;
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 2 Morphology: IDIOMORPHIC
PSEUDOMORPHS;
PLAGIOCLASE ( 10%)
Size(mm): 1-2.5 Morphology: IDIOMORPHIC
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): .1-.5 Morphology: MICROLITES
ALTERED;
CLINOPYROXENE ( 20%)
Size(mm): .1-.4 Morphology: MICROLITES
FRESH,AUGITIC;
COMBINATION ( 20%)
INCLUDES HEMATITE+CLAY.MINS+SMECTITE+CALCITE,
UNDIFFERENTIATED,ALTERED GROUNDMASS*
Alteration - CALCITE
Replacing: PLAG,OL
CLAY MINERALS
Replacing: PLAG,OL
NATROLITE
Replacing: PLAG
Vesicles -
Size(mm): 1
Percent: 1
Filling: CALCITE
Shape: CRESCENTIC
Leg : 51 Top/Bottom Interval(mm): 150/ 0 Describer: Juteau, T.
Hole: 417A Top of Core Depth(m) : 363.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 363.65 Sect/Pc #: 1/PCE 1B
ROCK = PLAG-CPX-OL PHYRIC BASALT
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 1 Morphology: IDIOMORPHIC
PSEUDOMORPHS;
PLAGIOCLASE ( 15%)
Size(mm): 1-5 Morphology: IDIOMORPHIC
CLINOPYROXENE ( <1%)
Size(mm): 1 Morphology: ROUNDED
FRESH,TWINNED,ROUNDED,CORRODED*
Groundmass - PLAGIOCLASE ( 40%)
CLINOPYROXENE ( 5%)
INTERSTITIAL;
COMBINATION ( 40%)
INCLUDES HEMATITE+SMECTITE+CLAY.MINS+CALCITE,
UNDIFFERENTIATED ALTERED GROUNDMASS*
Alteration - CALCITE
Location: PHENOS Replacing: PLAG,OL
MONTMORILLONITE
Replacing: PLAG PHENOS
ANALCITE
Replacing: PLAG PHENOS
NATROLITE
Replacing: PLAG PHENOS
Vesicles -
Size(mm): <.5
Percent: <1
Filling: CALCITE,
Filling: SMECTITE
Leg : 51 Top/Bottom Interval(mm): 180/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 363.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 366.68 Sect/Pc #: 3/PCE 1
ROCK = PLAG PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 20%)
Size(mm): 6 Morphology: EUHEDRAL
MOSTLY FRESH*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .1 Morphology: TABULAR,EUHEDRAL
CLINOPYROXENE ( 10%)
Size(mm): .03 Morphology: GRANULAR,ANHEDRAL
GLASS ( 45%)
DEVITRIFIED*
Vesicles -
Size(mm): .03
Percent: TR
Filling: CLAY.MINS
Leg : 51 Top/Bottom Interval(mm): 270/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 363.50 Rock Type: IGNEOUS
Core: 40 Sample Midpoint(m) : 369.77 Sect/Pc #: 5/PCE 1
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 1 Morphology: SUBHEDRAL
PLAGIOCLASE ( 25%)
Size(mm): 1-4 Morphology: EUHEDRAL
CLINOPYROXENE ( 3%)
Size(mm): .1-1 Morphology: EUHEDRAL-SUBHEDRAL
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): .4 Morphology: TABULAR,ACICULAR,SKELETAL
SKELETAL NEEDLES;
GLASS ( 60%)
DEVITRIFIED*
Alteration - SMECTITE
Location: VEINS,PHENOS Replacing: OL
CLAY MINERALS
Location: VEINS,PHENOS Replacing: OL
HEMATITE
Location: VEINS
CALCITE
Location: VEINS
Vesicles -
Size(mm): 1
Percent: TR
Filling: SMECTITE,CLAY
Leg : 51 Top/Bottom Interval(mm): 1040/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 369.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 370.54 Sect/Pc #: 1/PCE 2E,
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 10%)
Size(mm): 1-4 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-5 Morphology: EUHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 5%)
Size(mm): 1-3 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 1 Morphology: SKELETAL
CLINOPYROXENE ( 20%)
Size(mm): .5 Morphology: ANHEDRAL
MAGNETITE ( 5%)
Size(mm): .02 Morphology: EUHEDRAL
GLASS ( 20%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: OL,GLASS
SMECTITE
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 290/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 369.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 371.29 Sect/Pc #: 2/PCE 1C
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( 1%)
Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 25%)
Size(mm): 1-5 Morphology: EUHEDRAL
CLINOPYROXENE ( 3%)
Morphology: ROUND
ROUNDED,PARTIALLY RESORBED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .5 Morphology: SKELETAL
GLASS ( 50%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: OL,GLASS
CARBONATE
Location: VEIN
ZEOLITE
Location: VEIN
HEMATITE
Location: GLASS
SERICITE
Location: VEIN
IDENTITY UNCERTAIN FOR SERICITE*
Leg : 51 Top/Bottom Interval(mm): 1370/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 369.50 Rock Type: IGNEOUS
Core: 41 Sample Midpoint(m) : 375.37 Sect/Pc #: 4/PCE 4B
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): .5 Morphology: EUHEDRAL-SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-3 Morphology: EUHEDRAL
CLINOPYROXENE ( 5%)
Size(mm): 2 Morphology: EUHEDRAL
Groundmass - OLIVINE ( <5%)
PLAGIOCLASE ( 20%)
Size(mm): .1-.5 Morphology: TABULAR,SKELETAL
MAGNETITE ( 5%)
Size(mm): .02 Morphology: DENDRITIC
GLASS ( <5%)
Alteration - CLAY MINERALS
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 210/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 379.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 380.71 Sect/Pc #: 2/PCE 1A
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,HYALOOPHITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): .5-1 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-4 Morphology: EUHEDRAL
CLINOPYROXENE ( 20%)
Size(mm): 1-2 Morphology: ROUNDED
ROUNDED,GLOMEROPORPHYRITIC WITH PLAG*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .5 Morphology: DENDRITIC,TABULAR
CLINOPYROXENE ( 20%)
Size(mm): .1 Morphology: GRANULAR,PRISMATIC
MAGNETITE ( 5%)
Size(mm): .02 Morphology: DENDRITIC,EUHEDRAL
GLASS ( 10%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 1040/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 379.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 384.54 Sect/Pc #: 4/PCE 2
ROCK = PLAG-OL-CPX PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,VARIOLITIC;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( 10%)
Size(mm): .5-1 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): .5-2 Morphology: EUHEDRAL
SOME SHOWING OVERGROWTH ON PARTIALLY RESORBED
GRAINS;
CLINOPYROXENE ( <5%)
Size(mm): .5-1
PARTIALLY RESORBED*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): .3 Morphology: TABULAR,ACICULAR,SKELETAL
SKELETAL LATHS;
GLASS ( 55%)
DEVITRIFIED*
Alteration - IDDINGSITE
Replacing: OL
CLAY MINERALS
Replacing: OL,GLASS
CALCITE
Replacing: OL
HEMATITE
Location: GROUNDMASS Replacing: GLASS
DISSEMINATED*
Vesicles -
Size(mm): .1-1
Filling: CALCITE,SMEC
Leg : 51 Top/Bottom Interval(mm): 1450/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 379.00 Rock Type: IGNEOUS
Core: 42 Sample Midpoint(m) : 387.95 Sect/Pc #: 6/PCE 9
ROCK = PLAG-CPX-OL PHYRIC BASALT
MOD ALTERED;
Texture: PORPHYRITIC,VARIOLITIC;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): .5 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-3 Morphology: EUHEDRAL
MOSTLY ALTERED;
CLINOPYROXENE ( 3%)
Size(mm): 3
PARTIALLY RESORBED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .5 Morphology: LATHS,SKELETAL
COMBINATION ( 20%)
INCLUDES OL+CPX,ALTERED TO HEMATITE AND CLAY;
GLASS ( <35%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: PLAG,OL
SMECTITE
Location: ALSO IN VEINS Replacing: OL
HEMATITE
Location: GROUNDMASS Replacing: OL,GLASS
GROUNDMASS CONTAINS DISSEMINATED HEMATITE*
Vesicles -
Size(mm): .05
Percent: TR
Filling: SMECTITE,CLAY,
Filling: HEMATITE
Leg : 51 Top/Bottom Interval(mm): 820/ 0 Describer: Rusinov, V.
Hole: 417A Top of Core Depth(m) : 388.50 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 392.32 Sect/Pc #: 3/PCE 2A
ROCK = PLAG PHYRIC DOLERITE
SLIGHTLY ALTERED;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE (15-20%)
Size(mm): 2-5 Morphology: TABULAR
GLOMEROPHYRIC,ZONED,APPROX COMP AN73-86*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): .3-.5 Morphology: TABULAR
APPROX COMP AN68;
CLINOPYROXENE ( 25%)
Size(mm): .1-.2 Morphology: ANHEDRAL
MAGNETITE ( 10%)
Size(mm): .2 Morphology: ANHEDRAL
COMPLETELY ALTERED;
GLASS ( 10%)
ALTERED*
Alteration - CLAY MINERALS
Location: INTERSTITIAL Replacing: GLASS
Location: BETWEEN
Location: MICROLITES
CLAY.MINS POSSIBLY ALTERED TO CELADONITE*
Vesicles -
Size(mm): .5-1
Percent: 2-4
Location: GROUNDMASS
Filling: CELAD
Shape: ROUND
IDENTITY UNCERTAIN FOR CELADONITE*
Leg : 51 Top/Bottom Interval(mm): 240/ 0 Describer: Juteau, T.
Hole: 417A Top of Core Depth(m) : 388.50 Rock Type: IGNEOUS
Core: 43 Sample Midpoint(m) : 394.74 Sect/Pc #: 5/PCE 1
ROCK = DOLERITE
SLIGHTLY ALTERED;
Texture: PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 2-5 Morphology: TABULAR
FRESH,ZONED,APPROX COMP AN>66*
Groundmass - OLIVINE ( 1%)
Size(mm): .3-.4 Morphology: EUHEDRAL
PSEUDOMORPHED;
PLAGIOCLASE ( 50%)
Size(mm): .3-1 Morphology: MICROLITES
FRESH,APPROX COMP AN>45;
CLINOPYROXENE ( 30%)
Size(mm): .5 Morphology: INTERGRANULAR-POIKILITIC
APPROX COMP TI-AUGITE;
MAGNETITE ( 5%)
Size(mm): .1-.3 Morphology: GRANULAR
GLASS ( 1-2%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: OL
PLAG SHOWS INCIPIENT ALTERATION TO CLAY;
SMECTITE
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 130/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 394.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 394.63 Sect/Pc #: 1/PCE 1A
ROCK = DOLERITE
SLIGHTLY ALTERED;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 1 Morphology: EUHEDRAL
PLAGIOCLASE ( 20%)
Size(mm): 1-2 Morphology: EUHEDRAL-ANHEDRAL
GLOMEROPORPHYRITIC;
CLINOPYROXENE ( 3%)
Size(mm): 1 Morphology: EUHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): .1 Morphology: SUBHEDRAL-EUHEDRAL
PLAGIOCLASE ( 20%)
Size(mm): .7 Morphology: SUBHEDRAL-EUHEDRAL,PRISMATIC
CLINOPYROXENE ( 30%)
Size(mm): .7 Morphology: GRANULAR,ANHEDRAL,TABULAR
MAGNETITE ( 10%)
Size(mm): .1 Morphology: EUHEDRAL,PRISMATIC
GLASS ( <5%)
ALTERED*
Alteration - SMECTITE
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 60/ 0 Describer: Juteau, T.
Hole: 417A Top of Core Depth(m) : 394.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 397.56 Sect/Pc #: 3/PCE 1A
ROCK = DOLERITE
SLIGHTLY ALTERED;
Texture: OPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 2%)
Size(mm): 2-5 Morphology: IDIOMORPHIC
FRESH,ZONED WITH CORES OF APPROX COMP AN55-60 AND
RIMS OF APPROX COMP AN35*
Groundmass - OLIVINE ( 1%)
Size(mm): .3
IDENTITY UNCERTAIN FOR OL,PSEUDOMORPHED BY HEMA;
PLAGIOCLASE ( 50%)
Size(mm): .2-1 Morphology: IDIOMORPHIC
APPROX COMP AN50,FRESH;
CLINOPYROXENE ( 40%)
Size(mm): .1-.2 Morphology: POIKILITIC
LIGHT PINK COLOR,APPROX COMP TI-AUGITE,NO
PLEOCHROISM,FRESH,LIGHT PINK*
MAGNETITE ( 5%)
Alteration - HEMATITE
Replacing: OL
IDENTITY UNCERTAIN FOR OL*
Leg : 51 Top/Bottom Interval(mm): 100/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 394.50 Rock Type: IGNEOUS
Core: 44 Sample Midpoint(m) : 397.60 Sect/Pc #: 3/PCE 1A
ROCK = DOLERITE
SLIGHTLY ALTERED;
Texture: PORPHYRITIC,OPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 25%)
Size(mm): 2 Morphology: SUBHEDRAL-ANHEDRAL,TABULAR
CLINOPYROXENE ( 25%)
Size(mm): 2 Morphology: ANHEDRAL
PLAG INCLUSIONS COMMON*
Groundmass - OLIVINE ( <5%)
Morphology: ANHEDRAL
ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): .05 Morphology: ANHEDRAL-SUBHEDRAL
CLINOPYROXENE ( 15%)
Size(mm): .02 Morphology: ANHEDRAL
MAGNETITE ( 10%)
Size(mm): .05 Morphology: EUHEDRAL-ANHEDRAL
GLASS ( <5%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Replacing: OL
Leg : 51 Top/Bottom Interval(mm): 570/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 407.50 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 408.07 Sect/Pc #: 1/PCE 5B
ROCK = PLAG-CPX MODERATELY PHYRIC BASALT
MOD ALTERED,PILLOW BASALT;
Texture: PORPHYRITIC,VARIOLITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): .5 Morphology: EUHEDRAL
CLINOPYROXENE ( 2%)
Size(mm): .5
PARTIALLY RESORBED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .4 Morphology: LATHS,SKELETAL,EUHEDRAL,
Morphology: PRISMATIC
CLINOPYROXENE ( 20%)
Size(mm): .2 Morphology: GRANULAR
GLASS ( 50%)
DEVITRIFIED*
Alteration - CALCITE (=)2(>%)
HEMATITE
Location: VEINS
SMECTITE
Location: VEINS
Leg : 51 Top/Bottom Interval(mm): 840/ 0 Describer: Ui, Tadahide
Hole: 417A Top of Core Depth(m) : 407.50 Rock Type: IGNEOUS
Core: 46 Sample Midpoint(m) : 411.34 Sect/Pc #: 3/PCE 10
ROCK = PLAG-CPX-OL PHYRIC BASALT
COMPOSED OF PLAG-CPX-OL PHYRIC PILLOW BASALT
FRAGMENTS IN A MATRIX OF CALCITE AND GREEN
SMECTITE,MOD ALTERED,FRAGMENT IN VOLCANIC BRECCIA;
Texture: PORPHYRITIC,VARIOLITIC;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): .5 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 1-2 Morphology: EUHEDRAL
ALTERED;
CLINOPYROXENE ( 3%)
Size(mm): .5 Morphology: EUHEDRAL
ALTERED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): .2 Morphology: LATHS
COMBINATION ( 20%)
Size(mm): .05 Morphology: ANHEDRAL-GRANULAR
INCLUDES CPX OR OLIVINE,ALTERED;
MAGNETITE ( 10%)
Size(mm): .03 Morphology: DENDRITIC
GLASS ( 25%)
DEVITRIFIED*
Alteration - SMECTITE
Replacing: PLAG,OL,CPX
ZEOLITE
Replacing: PLAG
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