Leg : 66 Top/Bottom Interval(mm): 160/ 200 Describer: Lundberg, N.
Hole: 487 Top of Core Depth(m) : 172.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 172.18 Sect/Pc #: 1/PCE 3
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL GROUNDMASS*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 1-4 Morphology: EUHEDRAL
GLOMEROPORPHYRITIC,SLIGHTLY RESORBED,ROUNDED GLASS
INCLUSIONS*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.1 Morphology: EUHEDRAL-SUBHEDRAL
PLAGIOCLASE ( 40%)
Size(mm): 0.05-0.3 Morphology: SUBHEDRAL-EUHEDRAL,LATHS,
Morphology: NEEDLES,SKELETAL
NEEDLES ARE RARE;
CLINOPYROXENE ( 20%)
Morphology: ANHEDRAL,DENDRITIC
MAGNETITE ( 2%)
Size(mm): 0.01-0.05 Morphology: SKELETAL,DUST
TITANOMAGNETITE DUST + SMALL SKELETAL XTLS;
GLASS ( 28%)
PARTIALLY PALAGONITIZED*
Alteration - PALAGONITE ( <1%)
Replacing: GLASS
CLAY MINERALS
Location: VESICLES
Vesicles -
Size(mm): TO 0.1
Percent: <1
Filling: CLAY.MIN
PARTIALLY FILLED*
Leg : 66 Top/Bottom Interval(mm): 450/ 490 Describer: Lundberg, N.
Hole: 487 Top of Core Depth(m) : 172.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 172.47 Sect/Pc #: 1/PCE 8
ROCK = APHYRIC BASALT;
Texture: APHYRIC,INTERSERTAL*
Phenocrysts- OLIVINE ( TR%)
Size(mm): TO 0.5 Morphology: SUBHEDRAL,ROUNDED
PLAGIOCLASE ( <1%)
Size(mm): TO 0.4 Morphology: SUBHEDRAL,ROUNDED
ROUNDED AND RESORBED GLOMEROCRYSTS,CONTAINING
GLASS BLEBS*
Groundmass - OLIVINE ( 5%)
Size(mm): TO 0.05 Morphology: EUHEDRAL
PLAGIOCLASE ( 40%)
Size(mm): 0.05-0.3 Morphology: EUHEDRAL-SUBHEDRAL,LATHS,
Morphology: NEEDLES,SKELETAL
RARELY SKELETAL;
CLINOPYROXENE ( 30%)
Size(mm): TO 0.3 Morphology: ANHEDRAL,DENDRITIC,ELONGATE
MAGNETITE ( 5%)
Morphology: DUST
TITANOMAGNETITE DUST;
GLASS ( 20%)
SLIGHTLY PALAGONITIZED;
SPINEL ( TR%)
CHROME SPINEL*
Alteration - CLAY MINERALS ( <1%)
Location: VESICLES
PARTIALLY FILLING VESICLES;
PALAGONITE ( <1%)
Replacing: GLASS
Vesicles -
Size(mm): TO 0.05
Percent: <1
Filling: CLAY.MIN
Leg : 66 Top/Bottom Interval(mm): 630/ 660 Describer: Lundberg, N.
Hole: 487 Top of Core Depth(m) : 172.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 172.64 Sect/Pc #: 1/PCE 10
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL GROUNDMASS;
Where sampled: PILLOW INTERIOR
PROBABLY PILLOW INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
GLOMEROPORPHYRITIC AGGREGATES OF PLAG + OL;
PLAGIOCLASE ( 3%)
Size(mm): TO 2 Morphology: EUHEDRAL
GLOMEROPORPHYRITIC AGGREGATES OF PLAG + OL;
SPINEL ( TR%)
Size(mm): TO 0.05 Morphology: EUHEDRAL
INCLUSIONS IN PLAG PHENOS*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.02-0.1 Morphology: SUBHEDRAL-EUHEDRAL
OFTEN CENTER OF RADIATED PLAG LATHS;
PLAGIOCLASE ( 30%)
Size(mm): TO 0.2 Morphology: EUHEDRAL-SUBHEDRAL,LATHS,
Morphology: ACICULAR,SKELETAL
RARELY SKELETAL;
CLINOPYROXENE ( 35%)
Size(mm): TO 0.2 Morphology: ANHEDRAL,DENDRITIC
MAGNETITE ( 5%)
Morphology: DUST,SKELETAL
TITANOMAGNETITE DUST,RARELY SKELETAL;
GLASS ( 14%)
PARTIALLY PALAGONITIZED*
Alteration - CLAY MINERALS ( TR%)
Location: VESICLES Replacing: OL
INCLUDES IDDINGS,OL PARTIALLY ALTERED;
PALAGONITE ( 2%)
Replacing: GLASS
GLASS PARTIALLY ALTERED*
Vesicles -
Size(mm): TO 0.2
Percent: 1
Filling: CLAY.MIN
PARTIALLY FILLED*
Leg : 66 Top/Bottom Interval(mm): 810/ 860 Describer: Lundberg, N.
Hole: 487 Top of Core Depth(m) : 172.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 172.84 Sect/Pc #: 1/PCE 12
ROCK = PLAG SPARSELY PHYRIC BASALT
THIN SECTION IS THICK;
Texture: SPARSELY PORPHYRITIC,INTERSERTAL GROUNDMASS*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): TO 1.0 Morphology: EUHEDRAL
GLOMEROPORPHYRITIC CLUSTERS,GLASS INCLUSIONS*
Groundmass - OLIVINE ( 3%)
Morphology: SUBHEDRAL-EUHEDRAL
PLAGIOCLASE ( 25%)
Morphology: SUBHEDRAL-EUHEDRAL,NEEDLES,
Morphology: LATHS
CLINOPYROXENE ( 25%)
Morphology: ANHEDRAL
VERY FINE-GRAINED;
MAGNETITE ( 5%)
Morphology: DUST
GLASS ( 36%)
Alteration - COMBINATION ( 5%)
Replacing: GLASS
INCLUDES CLAY.MIN + PALAG*
Vesicles -
Percent: TR
Leg : 66 Top/Bottom Interval(mm): 680/ 700 Describer: Lundberg, N.
Hole: 487 Top of Core Depth(m) : 172.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 174.19 Sect/Pc #: 2/PCE 6
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL GROUNDMASS*
Phenocrysts- OLIVINE ( <1%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
GLOMEROCRYST AGGREGATES OF PLAG + OL,GLOMEROCRYSTS
ROUNDED WITH GLASS INCLUSIONS;
PLAGIOCLASE ( 3%)
Size(mm): TO 3 Morphology: EUHEDRAL
GLOMEROCRYST AGGREGATES OF PLAG + OL,GLOMEROCRYSTS
ROUNDED WITH GLASS INCLUSIONS;
SPINEL ( TR%)
Morphology: EUHEDRAL
CHROME SPINEL,INCLUSIONS WITHIN PLAG PHENOS*
Groundmass - OLIVINE ( 8%)
Size(mm): TO 0.1 Morphology: EUHEDRAL
PLAGIOCLASE ( 35%)
Size(mm): TO 0.3 Morphology: EUHEDRAL-SUBHEDRAL,LATHS,
Morphology: NEEDLES,SKELETAL
RARELY SKELETAL;
CLINOPYROXENE ( 35%)
Size(mm): TO 0.2 Morphology: ANHEDRAL,DENDRITIC,SKELETAL
OCCASIONALLY SKELETAL;
MAGNETITE ( 7%)
Morphology: DUST
GLASS ( 15%)
PARTIALLY PALAGONITIZED*
Alteration - PALAGONITE ( TR%)
Replacing: GLASS
Vesicles -
Size(mm): 0.02-0.1
Percent: 2
Filling: EMPTY
GENERALLY VOID*
Leg : 66 Top/Bottom Interval(mm): 810/ 840 Describer: Lundberg, N.
Hole: 487 Top of Core Depth(m) : 172.00 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 174.33 Sect/Pc #: 2/PCE 8
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL GROUNDMASS*
Phenocrysts- OLIVINE ( <1%)
Size(mm): TO 1 Morphology: EUHEDRAL
GLOMEROPORPHYRITIC CLUMPS OF PLAG + OL,ROUNDED,
PLAG CONTAINS GLASS INCLUSIONS*
Groundmass - OLIVINE ( 8%)
Size(mm): TO 0.1 Morphology: EUHEDRAL
PLAGIOCLASE ( 30%)
Size(mm): TO 0.3 Morphology: EUHEDRAL-SUBHEDRAL,LATHS,
Morphology: NEEDLES,SKELETAL
RARELY SKELETAL;
CLINOPYROXENE ( 35%)
Size(mm): TO 0.2 Morphology: ANHEDRAL,DENDRITIC
MAGNETITE ( 5%)
Morphology: DUST
GLASS ( 17%)
PARTIALLY PALAGONITIZED*
Alteration - CLAY MINERALS ( TR%)
Location: VESICLES
PALAGONITE ( TR%)
Replacing: GLASS
Vesicles -
Percent: 2
Filling: CLAY.MINS
PARTIALLY FILLED*
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