Leg : 53 Top/Bottom Interval(mm): 100/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 570.50 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 570.60 Sect/Pc #: 1/PCE 2
ROCK = PLAG-OL PHYRIC BASALT;
Texture: QUENCH,PORPHYRITIC
GROUNDMASS GRADES FROM PURE FRESH GLASS TO
DEVITRIFIED GLASS TO POORLY DEVELOPED VARIOLITIC
TO FELTY TEXTURE;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 1.5 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): TO 3.6 Morphology: EUHEDRAL
CONTAINS GLASS INCLUSIONS;
SPINEL ( TR%)
Size(mm): 0.05 Morphology: EUHEDRAL (OCTAHEDRAL)
ONE XTL IN GLASS + ONE ENCLOSED IN PLAG + RARE
PARTIALLY RESORBED CRYSTALS IN THE GROUNDMASS,
PARTIALLY ALTERED(?)*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.05-0.3 Morphology: SUBHEDRAL
NOW ALTERED TO SMECTITE;
PLAGIOCLASE ( 35%)
Size(mm): TO 0.3 Morphology: ACICULAR
GLASS ( 46%)
SOME POORLY CRYSTALLIZED;
OPAQUE MINERALS ( TO 2%)
Size(mm): .01 Morphology: GRANULAR
Alteration - CARBONATE
Location: VEINLETS, Replacing: OL,GLASS
Location: PHENOS,
Location: VESICLES,
Location: GROUNDMASS
SMECTITE
Location: VEINLETS, Replacing: OLIVINE,GLASS
Location: VESICLES,
Location: GROUNDMASS
ALTERATION IS GREEN SMECTITE WITH SOME BROWN
SMECTITE PATCHES IN THE GROUNDMASS*
Vesicles -
Size(mm): TO 0.2
Percent: 1
Filling: CALCITE,SMEC
Shape: SPHERICAL
ONLY MINOR AMOUNTS OF SMECTITE*
Leg : 53 Top/Bottom Interval(mm): 1040/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 570.50 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 571.54 Sect/Pc #: 1/PCE 6A
ROCK = PLAG-OL PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: QUENCH,PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.2-1.3 Morphology: EUHEDRAL
COMPLETELY ALTERED, ALTERED GLASS INCLUSIONS;
PLAGIOCLASE ( 15%)
Size(mm): 0.3-4.0 Morphology: EUHEDRAL
NUMEROUS INCLUSIONS,OCCASIONAL SLIGHTLY ROUNDED
PHENOCRYSTS;
SPINEL ( TR%)
Size(mm): TO 0.15 Morphology: EUHEDRAL
PARTIALLY ALTERED(?) TO MAGNETITE(?), WHAT WERE
DESCRIBED AS POSSIBLE SULFIDES IN PLAG PHENO ON
THE VISUAL CORE DESCRIPTION ARE PROBABLY ALTERED
SPINELS*
Groundmass - OLIVINE ( 4%)
Size(mm): <0.2 Morphology: SUBHEDRAL,GRANULAR
COMPLETELY ALTERED TO SMECTITE;
PLAGIOCLASE ( 33%)
Size(mm): TO 0.3 Morphology: ACICULAR,EUHEDRAL
SOME XTLS ACICULAR AND OTHERS SMALL AND EUHEDRAL;
CLINOPYROXENE ( 38%)
Morphology: CRYPTOCRYSTALLINE-DENDRITIC
OPAQUE MINERALS ( 8%)
Size(mm): 0.1 Morphology: ANHEDRAL SPECKS
INCLUDES MAGN + ILMENITE;
SULFIDE ( TR%)
Size(mm): .02
DISSEMINATED*
Alteration - CARBONATE
Location: VESICLES,
Location: GROUNDMASS
SMECTITE
Location: VEINLETS, Replacing: OL
Location: VESICLES,
Location: GROUNDMASS
Vesicles -
Size(mm): .06-.15
Percent: TR
Filling: CALCITE,SMEC
Shape: SPHERICAL
ONLY MINOR AMOUNTS OF SMECTITE IF ANY*
Leg : 53 Top/Bottom Interval(mm): 1090/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 570.50 Rock Type: IGNEOUS
Core: 49 Sample Midpoint(m) : 573.09 Sect/Pc #: 2/PCE 8C
ROCK = PLAG-OL PHYRIC BASALT;
Texture: QUENCH,PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.2-2.5 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 0.3-7.0 Morphology: EUHEDRAL
INCLUSIONS OF ALTERED GLASS AND SPINEL;
SPINEL ( TR%)
Size(mm): 0.03-0.15 Morphology: EUHEDRAL
FOUND AS INCLUSIONS IN PLAGIOCLASE*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 30%)
Size(mm): TO 0.7 Morphology: ACICULAR
CLINOPYROXENE ( 44%)
Size(mm): <0.02 Morphology: ELONGATE,DENDRITIC
POORLY CRYSTALLIZED, RADIATING SHEAVES;
OPAQUE MINERALS ( 6%)
Size(mm): 0.02 Morphology: GRANULAR
INCLUDES MAGNETITE+ILMENITE*
Alteration - CARBONATE ( <1%)
Location: GROUNDMASS, Replacing: OL
Location: PHENOS
OCCURS AS PATCHES IN THE GROUNDMASS;
SMECTITE
Location: GROUNDMASS Replacing: OLIVINE,OL PHENOS
OCCURS AS SPOTS IN THE GROUNDMASS*
Vesicles -
Size(mm): 0.15
Percent: TR
Filling: CALCITE,SMEC
Shape: SPHERICAL
VESICLES ARE VERY RARE*
Leg : 53 Top/Bottom Interval(mm): 990/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 573.50 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 574.49 Sect/Pc #: 1/PCE 6
ROCK = PLAG-OL PHYRIC BASALT;
Texture: GLASSY,QUENCH,PORPHYRITIC;
Where sampled: GLASSY MARGIN,NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.2-1.1 Morphology: EUHEDRAL
FRESH IN GLASS BUT ALTERED ELSEWHERE;
PLAGIOCLASE ( 18%)
Size(mm): 0.3-3.3 Morphology: EUHEDRAL
GLASS INCLUSIONS,SOME FRESH;
SPINEL ( TR%)
Size(mm): <0.05 Morphology: EUHEDRAL-SUBHEDRAL
SOMEWHAT ALTERED(?)*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.2-0.3 Morphology: SUBHEDRAL
PLAGIOCLASE ( 35%)
Size(mm): TO 0.4 Morphology: ACICULAR
PERCENTAGE TAKEN FROM NON-GLASSY REGIONS;
GLASS ( 38%)
SOME POORLY DEVITRIFIED;
OPAQUE MINERALS ( 5%)
Size(mm): <0.02 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE,VERY SMALL GRANULES WITH
CPX,PERCENTAGE TAKEN FROM NON-GLASSY REGIONS*
Alteration - CARBONATE
Location: VEIN, Replacing: OLIVINE
Location: VESICLES,
Location: GROUNDMASS
SMECTITE
Location: VESICLES Replacing: OLIVINE,OL PHENOS
Vesicles -
Size(mm): 0.05-0.2
Percent: TR
Filling: CALCITE,SMEC
Shape: SPHERICAL
Leg : 53 Top/Bottom Interval(mm): 1080/1100 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 573.50 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 574.59 Sect/Pc #: 1/PCE 7
ROCK = PLAG-OL PHYRIC BASALT;
Texture: QUENCH,PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): TO 1 Morphology: EUHEDRAL
COMPLETELY ALTERED TO SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): 2-4 Morphology: EUHEDRAL
RICH IN INCLUSIONS,ZONED;
SPINEL ( TR%)
Size(mm): 0.5
PARTIALLY INCLUDED IN OLIVINE*
Groundmass - OLIVINE ( 2%)
Size(mm): TO 0.3 Morphology: SUBHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 25%)
Size(mm): <0.5 Morphology: ACICULAR
CLINOPYROXENE ( 53%)
Size(mm): <0.1 Morphology: DENDRITIC,RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): .01 Morphology: GRANULAR
Alteration - CARBONATE
Location: VESICLES,
Location: CRACKS
SMECTITE
Location: VESICLES, Replacing: OLIVINE,OL PHENOS
Location: PHENOS,
Location: GROUNDMASS
Vesicles -
Size(mm): TO 0.2
Percent: 1
Filling: CALCITE,SMEC
Shape: SPHERICAL
Leg : 53 Top/Bottom Interval(mm): 830/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 573.50 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 575.83 Sect/Pc #: 2/PCE 5
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: QUENCH,PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 1 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): <3 Morphology: EUHEDRAL
CONTAINS GLASSY INCLUSIONS,ZONED;
CLINOPYROXENE ( <1%)
Size(mm): 2 Morphology: ROUNDED
ONE WITH PLAGIOCLASE INCLUSIONS*
Groundmass - OLIVINE ( 3%)
Size(mm): 0.2 Morphology: SUBHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 30%)
Size(mm): <0.3 Morphology: ACICULAR
CLINOPYROXENE ( 47%)
Morphology: RADIATING SHEAVES
POORLY CRYSTALLIZED;
OPAQUE MINERALS ( 5%)
Size(mm): .01 Morphology: GRANULAR
Alteration - CARBONATE ( <1%)
Location: VESICLES
SMECTITE
Location: VESICLES, Replacing: OLIVINE,OL PHENOS,GLASS
Location: PHENOS,
Location: GROUNDMASS
Vesicles -
Size(mm): 0.2
Percent: <1
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 40/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 573.50 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 576.54 Sect/Pc #: 3/PCE 1A
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: QUENCH,PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): <1.2 Morphology: EUHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 0.3-2.5 Morphology: EUHEDRAL
FRESH,CONTAINS GLASS INCLUSIONS;
CLINOPYROXENE ( TR%)
Size(mm): 0.6 Morphology: ANHEDRAL
PARTIALLY RESORBED;
SPINEL ( TR%)
Size(mm): 0.08 Morphology: EUHEDRAL,OCTAHEDRAL
OPAQUE,INCLUDED IN OLIVINE PHENOS,PERHAPS ALTERED
TO MAGNETITE?,ONE GOOD SPINEL*
Groundmass - OLIVINE ( 2%)
Size(mm): TO 0.2 Morphology: SUBHEDRAL
COMPLETELY ALTERED;
PLAGIOCLASE ( 30%)
Size(mm): <0.5 Morphology: ACICULAR
CLINOPYROXENE ( 39%)
Morphology: DENDRITIC,RADIATING SHEAVES
OPAQUE MINERALS ( 6%)
Size(mm): <0.02 Morphology: GRANULAR
INCLUDES MAGNETITE + ILMENITE*
Alteration - CARBONATE
Location: VEINS,
Location: GROUNDMASS
OCCURS AS PATCHES IN THE GROUNDMASS;
CLAY MINERALS ( 10%)
Location: VEINS, Replacing: OLIVINE
Location: GROUNDMASS
OCCURS AS PATCHES IN THE GROUNDMASS*
Vesicles -
Size(mm): <0.2
Percent: <1
Filling: CALCITE,SMEC
Shape: SPHERICAL
Leg : 53 Top/Bottom Interval(mm): 1190/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 573.50 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 577.69 Sect/Pc #: 3/PCE 2G
ROCK = PLAG-OL-CPX PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: GLASSY,PORPHYRITIC,COARSE-GRAINED*
Phenocrysts- OLIVINE ( <5%)
Size(mm): <1 Morphology: ANHEDRAL
PARTLY ALTERED;
PLAGIOCLASE ( >20%)
Size(mm): 1-2 Morphology: SUBHEDRAL
GLOMEROPORPHYRITIC,NORMAL ZONING;
CLINOPYROXENE ( <5%)
Size(mm): <1 Morphology: SUBHEDRAL
FRESH*
Groundmass - OLIVINE ( <5%)
Morphology: GRANULAR
ALTERED TO CALCITE + SMECTITE;
PLAGIOCLASE (40-50%)
Size(mm): <0.5 Morphology: ACICULAR
CLINOPYROXENE (40-50%)
OPAQUE MINERALS ( <5%)
INCLUDES MAGN + ILMENITE(?),ALTERED*
Alteration - CARBONATE
Location: VEINLETS, Replacing: OLIVINE
Location: GROUNDMASS
CLAY MINERALS
Location: VEINLETS, Replacing: OLIVINE,CPX
Location: GROUNDMASS
PALAGONITE ( 0.5%)
Replacing: GLASS
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 520/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 573.50 Rock Type: IGNEOUS
Core: 50 Sample Midpoint(m) : 578.52 Sect/Pc #: 4/PCE 4B
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.1-1.0 Morphology: EUHEDRAL
MOSTLY REPLACED BY SMECTITE;
PLAGIOCLASE ( 15%)
Size(mm): 3-5 Morphology: EUHEDRAL
UNDULATORY EXTINCTION WEAK;
SPINEL ( <1%)
Size(mm): 0.6 Morphology: EUHEDRAL
ONE PHENOCRYST*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.01-0.1 Morphology: SUBHEDRAL
REPLACED BY SMECTITE;
PLAGIOCLASE ( 25%)
Size(mm): TO 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 50%)
Size(mm): 0.01-0.1 Morphology: RADIATING SHEAVES
POORLY CRYSTALLIZED;
OPAQUE MINERALS ( 5%)
Size(mm): <0.01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Location: GROUNDMASS, Replacing: OLIVINE
Location: PHENOS
Vesicles -
Size(mm): TO 0.2
Percent: <1
Filling: SMECTITE,CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 110/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 582.90 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 584.51 Sect/Pc #: 2/PCE 1A
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 1-2 Morphology: EUHEDRAL
SOME FRESH,MANY ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 1-3 Morphology: EUHEDRAL
LARGE,CRACKED,SOMETIMES CORRODED,ZONED;
CLINOPYROXENE ( 3%)
Size(mm): TO 3 Morphology: ROUNDED
SIGNIFICANT PHENOS*
Groundmass - OLIVINE ( 2%)
Size(mm): TO .2 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): TO .3 Morphology: ACICULAR
CLINOPYROXENE ( 57%)
Size(mm): <1 Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): .01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Location: PHENOS, Replacing: OLIVINE
Location: GROUNDMASS
Vesicles -
Size(mm): <0.5
Percent: >1
Location: GROUNDMASS
Filling: SMECTITE
Shape: ROUND
VERY SMALL AND RARE*
Leg : 53 Top/Bottom Interval(mm): 540/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 582.90 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 584.94 Sect/Pc #: 2/PCE 2
ROCK = PLAG-OL-CPX PHYRIC BASALT
SHIPBOARD DESCRIPTION(UNEDITED);
VERY ALTERED;
Texture: PORPHYRITIC,GLASSY
GROUNDMASS IS GLASSY;
Where sampled: GLASSY MARGIN,NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( <5%)
Size(mm): <1 Morphology: EUHEDRAL
ALTERED
PLAGIOCLASE ( >20%)
Size(mm): 1-2 Morphology: SUBHEDRAL-EUHEDRAL
RESORBED MEGACRYSTS,GLOMEROPHYRIC CLUSTERS,
INCLUSIONS,ZONED;
CLINOPYROXENE ( TR%)
Size(mm): <1
SPINEL ( TR%)
Morphology: SUBHEDRAL
FRESH XTLS IN ALTERED OL AND FRESH PLAG PHENOS*
Groundmass - OLIVINE ( 1%)
LARGELY ALTERED BUT SOME FRESH MICROPHENOS;
PLAGIOCLASE ( 30%)
Morphology: ACICULAR
LARGELY ALTERED BUT SOME FRESH MICROPHENOS;
CLINOPYROXENE ( 20%)
LARGELY ALTERED BUT SOME FRESH MICROPHENOS;
GLASS ( 60%)
PERCENTAGE UNCERTAIN FOR GLASS,FRESH(?) TO VERY
ALTERED;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VEINS, Replacing: OLIVINE
Location: GROUNDMASS
VEINS ARE THICK (>1 MM);
CLAY MINERALS
Replacing: GROUNDMASS,GLASS
VERY OXIDIZED IN PLACES;
PALAGONITE
Replacing: GLASS
Leg : 53 Top/Bottom Interval(mm): 740/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 582.90 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 585.14 Sect/Pc #: 2/PCE 4A
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: QUENCH,PORPHYRITIC;
GROUNDMASS IS CRYPTOCRYSTALLINE EXCEPT FOR
FELDSPARS;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.9 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 15%)
Size(mm): <3.6 Morphology: EUHEDRAL
NUMEROUS GLASS INCLUSIONS;
CLINOPYROXENE ( TR%)
Size(mm): 1.1 Morphology: ROUNDED
ONLY ONE CRYSTAL*
Groundmass - PLAGIOCLASE ( 12%)
Size(mm): TO 0.3 Morphology: ACICULAR
0.2 MM IS THE MAXIMUM CRYSTAL LENGTH;
CLINOPYROXENE ( 68%)
Morphology: RADIATING SHEAVES
POORLY CRYSTALLIZED
OLIVINE ( 1%)
Size(mm): TO 0.2 Morphology: SUBHEDRAL
OPAQUE MINERALS ( 1%)
Size(mm): 0.01 Morphology: EUHEDRAL
Alteration - CARBONATE
Location: VESICLES
CLAY MINERALS
Replacing: OLIVINE,OL PHENOS
OL PHENOS ARE ALTERED TO SMECTITE*
Vesicles -
Size(mm): 0.2
Percent: <1
Filling: CALCITE
Shape: ROUNDED
SOME VESICLES ARE PARTIALLY FILLED WITH GLASS*
Leg : 53 Top/Bottom Interval(mm): 440/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 582.90 Rock Type: IGNEOUS
Core: 51 Sample Midpoint(m) : 586.34 Sect/Pc #: 3/PCE 2E
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,COARSE-GRAINED*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 1-2 Morphology: EUHEDRAL
RESORBED XTLS;
PLAGIOCLASE ( 15%)
Size(mm): >2 Morphology: SUBHEDRAL-EUHEDRAL,TWINNED
CRYSTALS ARE CLUSTERED,ZONED;
CLINOPYROXENE ( TR%)
Size(mm): 0.3-1.8 Morphology: ANHEDRAL,ROUNDED
FOUR GRAINS*
Groundmass - OLIVINE ( 1%)
Size(mm): TO 0.1 Morphology: SUBHEDRAL
VERY ALTERED;
PLAGIOCLASE ( 12%)
Size(mm): 0.3 Morphology: ACICULAR
SPINEL ( TR%)
Size(mm): .05 Morphology: EUHEDRAL
OPAQUE MINERALS ( <1%)
Size(mm): 0.01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE;
GLASS ( 70%)
DEVITRIFIED*
Alteration - CLAY MINERALS
Location: GROUNDMASS Replacing: OL,GLASS
VERY COMMON,OXIDIZED SMECTITE*
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 240/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 592.20 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 595.44 Sect/Pc #: 3/PCE 3
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 4%)
Size(mm): <2 Morphology: EUHEDRAL
MOSTLY REPLACED;
PLAGIOCLASE ( 12%)
Size(mm): 1-2 Morphology: EUHEDRAL-SUBHEDRAL
FRESH TO ALTERED,GLOMEROCRYSTS PRESENT;
CLINOPYROXENE ( 1%)
Size(mm): TO 1 Morphology: ANHEDRAL
OPHITIC*
Groundmass - OLIVINE ( 1%)
Size(mm): TO 0.2 Morphology: SUBHEDRAL
PSEUDOMORPHED BY CALCITE?;
PLAGIOCLASE ( 25%)
Size(mm): 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 54%)
Morphology: RADIATING SHEAVES
POORLY CRYSTALLIZED;
OPAQUE MINERALS ( 3%)
Size(mm): .01 Morphology: GRANULAR
Alteration - CARBONATE
Replacing: OLIVINE,GROUNDMASS
SMECTITE
Replacing: OLIVINE,GROUNDMASS
Vesicles -
Size(mm): <0.5
Percent: <1
Filling: SMECTITE
Shape: ROUND
RARE,SMECTITE IS BROWN*
Leg : 53 Top/Bottom Interval(mm): 1280/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 592.20 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 599.48 Sect/Pc #: 5/PCE 8B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 1-2 Morphology: EUHEDRAL
SOME FRESH WHILE OTHERS ARE ALTERED;
PLAGIOCLASE ( 12%)
Size(mm): 1-3 Morphology: EUHEDRAL-SUBHEDRAL
GLOMEROCRYSTS--SOMETIMES WITH FRESH CPX;
CLINOPYROXENE ( 1%)
Morphology: ANHEDRAL
SMALL FRESH MICROPHENOS,SOMETIMES FOUND IN
GLOMEROCRYSTS OF PLAG;
SPINEL ( <1%)
Size(mm): 0.3 Morphology: EUHEDRAL
RARE,IN GROUNDMASS*
Groundmass - OLIVINE ( 1%)
Size(mm): 0.2 Morphology: SUBHEDRAL
NONE FRESH IF PRESENT;
PLAGIOCLASE ( 25%)
Size(mm): TO 0.4 Morphology: ACICULAR
CLINOPYROXENE ( 54%)
Morphology: RADIATING SHEAVES
POORLY CRYSTALLIZED;
OPAQUE MINERALS ( 3%)
Size(mm): .01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Replacing: OLIVINE,GROUNDMASS
SMECTITE
Location: PHENOS, Replacing: OLIVINE,GROUNDMASS
Location: GROUNDMASS
BROWN*
Vesicles -
Size(mm): 0.6
Percent: <1
Filling: CALCITE
Shape: IRREGULAR
VERY RARE AMYGDULES*
Leg : 53 Top/Bottom Interval(mm): 300/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 592.20 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 600.00 Sect/Pc #: 6/PCE 2B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 1-2 Morphology: EUHEDRAL-SUBHEDRAL
LARGELY ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 2-4 Morphology: EUHEDRAL-SUBHEDRAL
GLOMEROCRYSTS,RESORBED CRYSTALS;
CLINOPYROXENE ( 1%)
Size(mm): TO 1.5 Morphology: ROUNDED
ONE FRESH PHENO IS ROUNDED*
Groundmass - OLIVINE ( 1%)
Size(mm): 0.2 Morphology: SUBHEDRAL
NO FRESH OLIVINE IN GROUNDMASS;
PLAGIOCLASE ( 35%)
Size(mm): 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 38%)
Size(mm): <0.5 Morphology: RADIATING SHEAVES
TO SUBOPHITIC;
OPAQUE MINERALS ( 6%)
Size(mm): TO 0.03 Morphology: GRANULAR-EUHEDRAL
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES, Replacing: OL,GROUNDMASS
Location: PHENOS
SMECTITE
Location: PHENOS, Replacing: OL,GROUNDMASS
Location: GROUNDMASS,
Location: VESICLES
Vesicles -
Size(mm): <0.2
Percent: 1
Filling: SMEC,CALCITE
Shape: ROUND
RARE AMYGDULES,ONE GOOD EXAMPLE OF A PARTIALLY
FILLED VESICLE*
Leg : 53 Top/Bottom Interval(mm): 390/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 592.20 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 600.09 Sect/Pc #: 6/PCE 2B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 1-2 Morphology: EUHEDRAL
ONE FRESH PHENO OTHERWISE ALTERED;
PLAGIOCLASE ( 12%)
Size(mm): 2-3 Morphology: EUHEDRAL
GLOMEROCRYSTS,BOTH FRESH AND RESORBED CRYSTALS;
CLINOPYROXENE ( 1%)
Size(mm): TO 1 Morphology: ROUNDED
BOTH FRESH AND RESORBED? CRYSTALS*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 35%)
Size(mm): 0.4 Morphology: ACICULAR
FRESH;
CLINOPYROXENE ( 37%)
Morphology: RADIATING SHEAVES
SUBOPHITIC,MOSTLY FRESH;
OPAQUE MINERALS ( 8%)
Size(mm): 0.05 Morphology: GRANULAR-LATH SHAPED
Alteration - CARBONATE
Location: VESICLES Replacing: OL,GROUNDMASS
SMECTITE
Location: VESICLES Replacing: OL,GROUNDMASS
SMECTITE IS BROWN*
Vesicles -
Size(mm): 0.5
Percent: 1
Filling: CARB,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 640/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 592.20 Rock Type: IGNEOUS
Core: 52 Sample Midpoint(m) : 601.84 Sect/Pc #: 7/PCE 4
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 4%)
Size(mm): TO 1 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 1-2 Morphology: SUBHEDRAL-ROUNDED
GLOMEROPHYRIC CLOTS--POSSIBLY WITH SOME CPX?--
SOME ROUNDED;
CLINOPYROXENE ( 2%)
Size(mm): TO 1 Morphology: SUBHEDRAL,TWINNED
LARGE,SUBOPHITIC,POSSIBLY FOUND IN PLAGIOCLASE
GLOMEROCRYSTS*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 30%)
Size(mm): 0.4 Morphology: ACICULAR
CLINOPYROXENE ( 42%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): .02 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES Replacing: OL,GROUNDMASS
SMECTITE
Replacing: OL,GROUNDMASS
Vesicles -
Size(mm): 0.4
Percent: <1
Filling: CARB
Shape: ROUND-
Shape: IRREGULAR
Leg : 53 Top/Bottom Interval(mm): 520/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 601.60 Rock Type: IGNEOUS
Core: 53 Sample Midpoint(m) : 603.62 Sect/Pc #: 2/PCE 4B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 5%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
OCCASIONALLY FRESH--OTHERWISE HIGHLY ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 2-3 Morphology: EUHEDRAL
GLOMEROCRYSTS WITH INCLUSIONS OF OLIVINE AND
RARELY CLINOPYROXENE;
CLINOPYROXENE ( 2%)
Size(mm): TO 2.5 Morphology: SUBOPHITIC-ROUNDED
SPINEL ( TR%)
Size(mm): 0.3 Morphology: EUHEDRAL
PARTIALLY ALTERED,IN THE GROUNDMASS*
Groundmass - OLIVINE ( 1%)
Size(mm): 0.2 Morphology: SUBHEDRAL
PLAGIOCLASE ( 10%)
Size(mm): 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 60%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 6%)
Size(mm): .01 Morphology: GRANULAR
INCLUDES ILMENITE+MAGN*
Alteration - CARBONATE
Location: VESICLES Replacing: OL,GROUNDMASS
ALSO IN COMPLEX VEINS;
SMECTITE
Replacing: OL,GROUNDMASS
Vesicles -
Size(mm): .5
Percent: 1
Filling: CALCITE
Shape: ROUND
AMYGDULES*
Leg : 53 Top/Bottom Interval(mm): 290/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 601.60 Rock Type: IGNEOUS
Core: 53 Sample Midpoint(m) : 604.89 Sect/Pc #: 3/PCE 1B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 1-2 Morphology: EUHEDRAL
HIGHLY ALTERED EXCEPT FOR LARGE (2 MM) MEGACRYST,
FRESH PLAG LATHS INCLUDED IN MEGACRYST;
PLAGIOCLASE ( 15%)
Size(mm): TO 2 Morphology: EUHEDRAL
GLOMEROCRYSTS;
CLINOPYROXENE ( 2%)
Size(mm): TO 0.5 Morphology: SUBHEDRAL
SMALL FRESH MICROPHENOS PRESENT;
SPINEL ( TR%)
Size(mm): 0.2 Morphology: EUHEDRAL
PARTIALLY ALTERED,FOUND IN GROUNDMASS*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 30%)
Size(mm): 0.4 Morphology: ACICULAR
CLINOPYROXENE ( 41%)
Morphology: RADIATING SHEAVES
SUBOPHITIC,RELATIVELY FRESH;
OPAQUE MINERALS ( 5%)
Size(mm): 0.01 Morphology: GRANULAR
INCLUDES MAGN+ILMENITE*
Alteration - CARBONATE
Replacing: OL,GROUNDMASS
ALTERATION IS MINIMAL;
SMECTITE
Location: PHENOS, Replacing: OL,GROUNDMASS
Location: GROUNDMASS
SMECTITE IS BROWN*
Vesicles -
Size(mm): 0.2
Percent: <1
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 340/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 611.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 611.34 Sect/Pc #: 1/PCE 2A
ROCK = PLAG-CPX-OL PHYRIC BASALT
THIS IS DISTINCTLY DIFFERENT FROM UNIT IMMEDIATELY
ABOVE. IT IS CHARACTERIZED BY GLOMEROCRYSTS OF
PLAG AND CPX IN OPHITIC RELATIONSHIP. THE CPX ARE
PARTIALLY RESORBED BUT HAVE A DISTINCTLY MORE
EUHEDRAL APPEARANCE. THE ROUND SOLITARY CPX OF
UNIT ABOVE ARE ABSENT HERE. NO SPINEL IS PRESENT
HERE. ALSO THE GROUNDMASS HAS A HIGHER CPX:PLAG
RATIO THAN ABOVE UNIT. (THESE COMMENTS WERE MADE
BY MTZ.);
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): TO 4
GLOMEROPHYRIC CLOTS OF PLAG + CPX + MAYBE SOME OL;
CLINOPYROXENE ( 10%)
Size(mm): 1-2
GLOMEROPHYRIC CLOTS OF PLAG + CPX + MAYBE SOME OL,
SUBOPHITIC,ONE STRAINED CPX,PARTIALLY RESORBED*
Groundmass - OLIVINE ( 5%)
Size(mm): TO 0.4 Morphology: EUHEDRAL
PLAGIOCLASE ( 15%)
Size(mm): TO 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 49%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): 0.03 Morphology: GRANULAR-EUHEDRAL
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES
ALTERATION IS MINIMAL;
SMECTITE
Location: GROUNDMASS Replacing: OL,GROUNDMASS
MINIMAL ALTERATION*
Vesicles -
Size(mm): <0.5
Percent: 1
Location: GROUNDMASS
Filling: CARBONATE
Shape: ROUND-OVOID
Leg : 53 Top/Bottom Interval(mm): 690/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 611.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 611.69 Sect/Pc #: 1/PCE 5
ROCK = PLAG-CPX-OL PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: PORPHYRITIC,APHANITIC
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( <5%)
Size(mm): 1 Morphology: SUBHEDRAL
PLAGIOCLASE ( <30%)
Size(mm): 2-3 Morphology: EUHEDRAL-SUBHEDRAL
PARTIALLY RESORBED,COMPLEX OSCILLATORY ZONING
PRESENT,GLOMEROCRYSTS WITH OL + PLAG + CPX,SOME
CORROSIVE INCLUSIONS (CONCENTRIC) IN LARGE PHENOS,
FRESH LATHS ARE SECOND GENERATION CRYSTALS?,ZONED;
CLINOPYROXENE ( <5%)
Size(mm): 1 Morphology: SUBHEDRAL
OPHITIC,HOURGLASS ZONING*
Groundmass - OLIVINE ( 10%)
Size(mm): <0.5
FRESH TO ALTERED,GLASS AND MICROPHENOS;
PLAGIOCLASE ( 30%)
Size(mm): <0.5 Morphology: ACICULAR
CLINOPYROXENE ( 30%)
Size(mm): <0.5
OPAQUE MINERALS
PERCENTAGE UNCERTAIN FOR OP.MINS,INCLUDES MAGN +
ILMENITE;
GLASS ( 20%)
Alteration - CARBONATE
Location: VESICLES Replacing: VOIDS
CLAY MINERALS
Location: GROUNDMASS Replacing: GLASS
Vesicles -
Size(mm): <1
Percent: 2-5
Location: MATRIX
Filling: CARB,SMEC,GLASS
Shape: ROUND-OVOID
SMECTITE IS BROWN AND MAY BE FROM ALTERED GLASS?*
Leg : 53 Top/Bottom Interval(mm): 850/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 611.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 611.85 Sect/Pc #: 1/PCE 6
ROCK = PLAG-OL PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.2-0.4 Morphology: EUHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY SMECTITE;
PLAGIOCLASE ( 20%)
Size(mm): 0.2-6 Morphology: EUHEDRAL
MANY CRACKS IN CRYSTALS;
SPINEL ( TR%)
Size(mm): 0.12 Morphology: SUBHEDRAL
ONLY ONE GRAIN*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.05 Morphology: SUBHEDRAL
REPLACED BY SMECTITE*
PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.8 Morphology: ACICULAR,SHEAVES
CLINOPYROXENE ( 40%)
Size(mm): 0.05-0.4 Morphology: SHEAVES
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITES;
GLASS ( 20%)
RECRYSTALLIZED*
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Location: VESICLES Replacing: OL
CHLORITE
Location: VESICLES
Vesicles -
Size(mm): 0.1-0.6
Percent: 2
Filling: CHLORITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1220/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 611.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 612.22 Sect/Pc #: 1/PCE 9
ROCK = PLAG-CPX-OL PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: PORPHYRITIC,APHANITIC
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE
Size(mm): 1
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 0.5-2 Morphology: EUHEDRAL-SUBHEDRAL
FINE GLOMEROCRYSTS WITH POSSIBLY SOME CPX? AND
OL?,LARGER PHENOS UNCORRODED;
CLINOPYROXENE
Morphology: SUBHEDRAL
OPHITIC,MICROPHENOS,ZONED*
Groundmass - OLIVINE ( 20%)
Morphology: GRANULAR
PLAGIOCLASE ( 30%)
Morphology: ACICULAR
CLINOPYROXENE ( 30%)
Morphology: GRANULAR
OPAQUE MINERALS
PERCENTAGE UNCERTAIN FOR OP.MINS,INCLUDES MAGN +
ILMENITE;
GLASS ( 20%)
CONSIDERABLY ALTERED--REPLACED BY SMECTITE,
OXIDIZED*
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Location: GROUNDMASS Replacing: GLASS
OXIDIZED*
Vesicles -
Size(mm): <1
Percent: 2
Filling: CARB
Shape: IRREGULAR
Leg : 53 Top/Bottom Interval(mm): 730/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 611.00 Rock Type: IGNEOUS
Core: 54 Sample Midpoint(m) : 613.23 Sect/Pc #: 2/PCE 6
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 1 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): 1-2 Morphology: LATHS
GLOMEROPORPHYRITIC CLOTS WITH CPX,BOTH HOURGLASS
AND CONCENTRIC ZONING PROMINENT,FRESH,LATHS ARE
WELL FORMED;
CLINOPYROXENE ( 7%)
Size(mm): <1 Morphology: SUBHEDRAL
GLOMEROPORPHYRITIC CLOTS WITH PLAG--BOTH
HOURGLASS AND CONCENTRIC ZONING PROMINENT,FRESH,
SUBOPHITIC INTERGROWTHS;
OPAQUE MINERALS ( <1%)
Size(mm): 0.4 Morphology: EUHEDRAL,SKELETAL
Groundmass - OLIVINE ( 1%)
Size(mm): 0.15 Morphology: EUHEDRAL
PLAGIOCLASE ( 8%)
Size(mm): 0.4 Morphology: ACICULAR
OPAQUE MINERALS ( 5%)
Size(mm): 0.01 Morphology: GRANULAR
INCLUDES MAGN+ILMENITE;
GLASS ( 62%)
DEVITRIFIED*
Alteration - CARBONATE
Location: PHENOS, Replacing: OL,GLASS
Location: VESICLES,
Location: GROUNDMASS
SMECTITE
Replacing: OL,GROUNDMASS
GLASS LARGELY REPLACED BY BROWN SMECTITE + SOME
CARB*
Vesicles -
Size(mm): TO 0.4
Percent: 2
Location: MATRIX
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 510/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 620.40 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 620.91 Sect/Pc #: 1/PCE 2B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 0.1-0.8 Morphology: EUHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): 0.2-2.5 Morphology: EUHEDRAL
COMPLEX OSCILLATORY ZONING,SLIGHTLY ALTERED;
CLINOPYROXENE ( 1%)
Size(mm): 0.1-0.4 Morphology: ANHEDRAL
SOME SUBOPHITIC GLOMEROCRYSTS WITH PLAGIOCLASE*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
PLAGIOCLASE ( 10%)
Size(mm): TO 0.3 Morphology: ACICULAR
OPAQUE MINERALS ( 7%)
Size(mm): .02 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE;
GLASS ( 63%)
DEVITRIFIED*
Alteration - CARBONATE
Location: VESICLES, Replacing: OL
Location: VEINS,PHENOS
SMECTITE
Location: GROUNDMASS Replacing: GLASS,OL PHENOS
OL PHENOS COMPLETELY REPLACED BY SMECTITE*
Vesicles -
Size(mm): 0.1-0.4
Percent: 1
Location: MATRIX
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 710/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 620.40 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 625.61 Sect/Pc #: 4/PCE 6A
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 0.5 Morphology: EUHEDRAL-SUBHEDRAL
COMPLETELY REPLACED BY SMECTITE + CALCITE;
PLAGIOCLASE ( 10%)
Size(mm): 0.1-2.0 Morphology: EUHEDRAL
VERY FRESH,MOSTLY UNZONED*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): 0.3 Morphology: SKELETAL
OPAQUE MINERALS ( 10%)
Size(mm): .01
INCLUDES MAGN + ILMENITE;
CLINOPYROXENE ( 65%)
Morphology: RADIATING SHEAVES
Alteration - CARBONATE
Location: VESICLES, Replacing: OL
Location: PHENOS
SMECTITE
Replacing: OL
OL PHENOS ARE COMPLETELY REPLACED BY SMECTITE +
CALCITE*
Vesicles -
Size(mm): TO 0.3
Percent: 2
Location: GROUNDMASS
Filling: CARB
Shape: ROUND
QUENCH VESICLES*
Leg : 53 Top/Bottom Interval(mm): 850/ 870 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 620.40 Rock Type: IGNEOUS
Core: 55 Sample Midpoint(m) : 630.26 Sect/Pc #: 7/PCE 7
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL-INTERGRANULAR;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 8%)
Size(mm): TO 0.5 Morphology: EUHEDRAL-SUBHEDRAL
PLAGIOCLASE ( 12%)
Size(mm): 1-4 Morphology: LATHS
CLINOPYROXENE ( 3%)
Size(mm): 0.5 Morphology: ANHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): 0.05 Morphology: ANHEDRAL
PLAGIOCLASE ( 30%)
Size(mm): 0.3
CLINOPYROXENE ( 35%)
Size(mm): 0.15
MAGNETITE ( 5%)
Size(mm): 0.01 Morphology: SUBHEDRAL
Alteration - CARBONATE
Location: VEINS,
Location: VESICLES
SMECTITE
Replacing: OL
Vesicles -
Size(mm): 0.3-0.7
Percent: 2
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 240/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 629.80 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 630.04 Sect/Pc #: 1/PCE 1B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH,VARIOLITIC*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 0.5 Morphology: SUBHEDRAL
ALTERED,SOME MICROPHENOS;
PLAGIOCLASE ( 25%)
Size(mm): TO 4 Morphology: LARGE SUBHEDRAL-SMALL
Morphology: EUHEDRAL LATHS
GLOMEROCRYSTS,MICROPHENOS;
CLINOPYROXENE ( 3%)
Size(mm): TO 0.5 Morphology: SUBHEDRAL
OPHITIC,QUITE FRESH;
SPINEL ( TR%)
Size(mm): 0.15 Morphology: ANHEDRAL
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): 0.2 Morphology: SKELETAL
VARIOLITIC;
CLINOPYROXENE ( 60%)
Size(mm): <0.5 Morphology: RADIATING SHEAVES
SUBOPHITIC;
OPAQUE MINERALS ( 1%)
Size(mm): 0.01 Morphology: ANHEDRAL
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES Replacing: OL PHENOS
SMECTITE
Replacing: OL
SMECTITE IS DARK BROWN*
Vesicles -
Size(mm): 0.5
Percent: 2
Filling: CALCITE,MN
Shape: ROUND
IDENTITY UNCERTAIN FOR MN*
Leg : 53 Top/Bottom Interval(mm): 700/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 629.80 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 630.50 Sect/Pc #: 1/PCE 3C
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 5%)
Size(mm): TO 3 Morphology: SUBHEDRAL
MOSTLY ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): TO 5 Morphology: SUBHEDRAL,SERIATE
GLOMEROCRYSTS WITH CPX,PRONOUNCED OSCILLATORY
ZONING;
CLINOPYROXENE ( 2%)
Size(mm): TO 0.5 Morphology: ANHEDRAL
OPHITIC,HOURGLASS ZONING*
Groundmass - OLIVINE ( 4%)
Size(mm): .05 Morphology: GRANULAR
MOSTLY FRESH;
PLAGIOCLASE ( 30%)
Size(mm): 0.3 Morphology: SKELETAL
CLINOPYROXENE ( 30%)
Size(mm): 0.1 Morphology: GRANULAR-SHEAF LIKE
OPAQUE MINERALS ( 7%)
Size(mm): .01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES, Replacing: OL,VOIDS
Location: NARROW VEINS
SMECTITE
Replacing: OL
GREEN + BROWN SMECTITE*
Vesicles -
Size(mm): TO 0.3
Percent: I
Filling: CARB,MN
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 210/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 629.80 Rock Type: IGNEOUS
Core: 56 Sample Midpoint(m) : 639.01 Sect/Pc #: 7/PCE 2
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,GRANULAR-APHANITIC,QUENCH
GROUNDMASS IS GRANULAR-APHANITIC*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 0.8 Morphology: EUHEDRAL
ALTERED--SOME COMPLETELY;
PLAGIOCLASE ( 15%)
Size(mm): 1-3 Morphology: SUBHEDRAL,LATHS
GLOMEROCRYSTS--MOSTLY JUST OF PLAG;
CLINOPYROXENE ( 2%)
Size(mm): TO 0.8 Morphology: SUBHEDRAL
OPHITIC*
Groundmass - OLIVINE ( 4%)
Size(mm): TO 0.3 Morphology: SUBHEDRAL
MOSTLY ALTERED;
PLAGIOCLASE ( 25%)
Size(mm): TO 0.5 Morphology: ACICULAR
FRESH;
CLINOPYROXENE ( 39%)
Morphology: RADIATING SHEAVES
FRESH;
OPAQUE MINERALS ( 6%)
Size(mm): .01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE;
GLASS ( 5%)
QUITE FRESH*
Alteration - CARBONATE
Location: VESICLES, Replacing: OL
Location: GROUNDMASS,
Location: PHENOS
MOSTLY REPLACING OL;
SMECTITE
Location: VESICLES, Replacing: OL
Location: GROUNDMASS,
Location: PHENOS
MOSTLY REPLACING OL,SMECTITE IS BROWN AND
OXIDIZED*
Vesicles -
Size(mm): .5
Percent: 1
Filling: SMEC,CARB
Shape: ROUND
SMECTITE FILLING IS DOMINANT*
Leg : 53 Top/Bottom Interval(mm): 550/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 639.00 Rock Type: IGNEOUS
Core: 57 Sample Midpoint(m) : 639.55 Sect/Pc #: 1/PCE 4A
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,APHANITIC-VARIOLITIC,QUENCH
GROUNDMASS IS APHANITIC-VARIOLITIC*
Phenocrysts- OLIVINE ( 4%)
Size(mm): TO 1 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 0.5-1.5 Morphology: SUBHEDRAL
RESORBED,ALTERED;
CLINOPYROXENE ( 5%)
Morphology: SUBOPHITIC
Groundmass - OLIVINE ( 1%)
Size(mm): <0.5 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): <0.5 Morphology: ACICULAR SHEAVES
CLINOPYROXENE ( 52%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 2%)
Size(mm): .01 Morphology: GRANULAR
Alteration - CARBONATE
Location: VESICLES, Replacing: OL,GROUNDMASS
Location: GROUNDMASS
SMECTITE
Location: GROUNDMASS Replacing: OL,GROUNDMASS
SMECTITE IS BROWN AND OXIDIZED*
Vesicles -
Size(mm): 2
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 680/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 639.00 Rock Type: IGNEOUS
Core: 57 Sample Midpoint(m) : 639.68 Sect/Pc #: 1/PCE 4B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,VESICULAR,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 5%)
Size(mm): <1 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 12%)
Size(mm): 1-3 Morphology: EUHEDRAL-SUBHEDRAL
GLOMEROPHYRIC CLOTS WITH CPX,ALTERED WITH
INCLUSIONS,OSCILLATORY ZONING;
CLINOPYROXENE ( 5%)
Size(mm): TO 1 Morphology: SUBOPHITIC
GLOMEROPHYRIC CLOTS WITH PLAG,OPHITIC,OSCILLATORY
ZONING*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): TO 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 30%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 8%)
Size(mm): 0.01 Morphology: GRANULAR
GLASS ( 5%)
Alteration - CARBONATE
Location: VESICLES Replacing: VOIDS
CLAY MINERALS
Location: VESICLES, Replacing: GROUNDMASS,OL
Location: GROUNDMASS
OXIDIZED*
Vesicles -
Size(mm): 1-2
Percent: 5
Filling: CARB,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 900/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 639.00 Rock Type: IGNEOUS
Core: 57 Sample Midpoint(m) : 639.90 Sect/Pc #: 1/PCE 4D
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.4 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): <4 Morphology: EUHEDRAL
GLOMEROCRYSTS,FRESH,ZONED;
CLINOPYROXENE ( 1%)
Size(mm): 0.3 Morphology: SUBOPHITIC
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): <0.8 Morphology: ACICULAR,EQUILATERAL XTLS
FRESH,<0.8 MM IN LENGTH;
CLINOPYROXENE ( 35%)
Morphology: DENDRITIC,ACICULAR-GRANULAR
FRESH,RADIATING SHEAVES;
OPAQUE MINERALS ( 8-10%)
Size(mm): .05 Morphology: GRANULAR-ELONGATE
INCLUDES MAGN + ILMENITE,<0.1 MM IN LENGTH;
GLASS ( 5%)
ALTERED TO SMECTITE AND CALCITE*
Alteration - CARBONATE
Replacing: OL,GLASS
SMECTITE
Replacing: OL,GLASS
Vesicles -
Size(mm): 0.8
Percent: 2
Filling: CALCITE,SMEC
Shape: ROUNDED
SOME SHRINKAGE VESICLES FILLED WITH FINE-GRAINED
GROUNDMASS*
Leg : 53 Top/Bottom Interval(mm): 650/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 639.00 Rock Type: IGNEOUS
Core: 57 Sample Midpoint(m) : 644.15 Sect/Pc #: 4/PCE 5B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,GRANULAR-APHANITIC,QUENCH
GROUNDMASS IS GRANULAR-APHANITIC*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 1 Morphology: EUHEDRAL
MORPHOLOGY UNCERTAIN FOR OL,ALTERED;
PLAGIOCLASE ( 15%)
Size(mm): 1-3 Morphology: EUHEDRAL-SUBHEDRAL LATHS
MOSTLY FRESH GLOMEROCRYSTS,SOME INCLUSIONS;
CLINOPYROXENE ( 2%)
Size(mm): TO 1 Morphology: SUBOPHITIC
FRESH*
Groundmass - OLIVINE ( 2%)
Size(mm): <0.5 Morphology: EUHEDRAL
MOSTLY ALTERED;
PLAGIOCLASE ( 25%)
Size(mm): TO 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 41%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 6%)
Size(mm): .02 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE;
GLASS ( 5%)
Alteration - CARBONATE
Location: VESICLES, Replacing: OL,GROUNDMASS
Location: GROUNDMASS
CLAY MINERALS ( TR%)
Location: GROUNDMASS Replacing: OL,GROUNDMASS
Vesicles -
Size(mm): 1-2
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 760/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 648.20 Rock Type: IGNEOUS
Core: 58 Sample Midpoint(m) : 650.46 Sect/Pc #: 2/PCE 3D
ROCK = PLAG-OL-CPX PHYRIC BASALT
ALTERED;
Texture: PORPHYRITIC,APHANITIC,QUENCH
GROUNDMASS IS APHANITIC*
Phenocrysts- OLIVINE ( 2%)
Size(mm): <1 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 1-3 Morphology: SUBHEDRAL-EUHEDRAL,ACICULAR
GLOMEROCRYSTS AND ACICULAR MICROPHENOCRYSTS;
CLINOPYROXENE ( 2%)
Size(mm): TO 0.3 Morphology: ANHEDRAL
OPHITIC,PARTLY ALTERED*
Groundmass - OLIVINE ( 1%)
Size(mm): 0.25
PLAGIOCLASE ( 15%)
Size(mm): TO 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 50%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 8%)
Size(mm): 0.01 Morphology: EUHEDRAL
INCLUDES MAGN+ILMENITE*
Alteration - SMECTITE
Location: VEINLETS, Replacing: OL,VOIDS
Location: GROUNDMASS,
Location: VESICLES
Vesicles -
Size(mm): <0.5
Percent: 2
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 250/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 648.20 Rock Type: IGNEOUS
Core: 58 Sample Midpoint(m) : 652.95 Sect/Pc #: 4/PCE 2
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.3 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 8-10%)
Size(mm): 2 Morphology: EUHEDRAL
GLASSY INCLUSIONS PRESENT,FRESH,ZONED;
CLINOPYROXENE ( 1%)
Size(mm): 0.3 Morphology: ANHEDRAL
SUBOPHITIC,FRESH*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): TO 0.6 Morphology: ACICULAR,SKELETAL,SERIATE
<1 MM IN LENGTH,FRESH;
CLINOPYROXENE ( 55%)
Size(mm): <0.1 Morphology: RADIATING SHEAVES
FRESH;
MAGNETITE ( 8-10%)
Size(mm): 0.01 Morphology: GRANULAR,ELONGATE,EUHEDRAL
SOME LATHS TO 0.3 MM*
Alteration - SMECTITE
Replacing: OL PHENOS
Vesicles -
Size(mm): 0.2
Percent: 1
Filling: CALCITE
Shape: ROUNDED
Leg : 53 Top/Bottom Interval(mm): 360/ 0 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 657.40 Rock Type: IGNEOUS
Core: 59 Sample Midpoint(m) : 662.26 Sect/Pc #: 4/PCE 3A
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,GLASSY,VARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 2.5 Morphology: EUHEDRAL
PLAGIOCLASE ( 5%)
Size(mm): TO 3.0 Morphology: EUHEDRAL
Groundmass - PLAGIOCLASE ( 2%)
Size(mm): 0.2-0.4 Morphology: SKELETAL
GLASS ( 88%)
PARTLY DEVITRIFIED*
Alteration - CARBONATE
Replacing: OL,GLASS
SILICA
Replacing: GLASS
SMECTITE
Location: VEIN,VESICLES Replacing: OL PHENOS
Vesicles -
Size(mm): 0.1
Percent: <1
Location: GLASS
Filling: ROUND
Leg : 53 Top/Bottom Interval(mm): 120/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 667.00 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 667.12 Sect/Pc #: 1/PCE 1A
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): <1.3 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): <4 Morphology: EUHEDRAL
OFTEN IN GLOMEROCRYSTS,FRESH,ZONED;
CLINOPYROXENE ( TR%)
Size(mm): <0.8
SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): TO 0.5 Morphology: ACICULAR,SKELETAL
CLINOPYROXENE ( 45%)
Size(mm): <0.2 Morphology: GRANULAR-SUBOPHITIC
FRESH;
MAGNETITE ( 7%)
Size(mm): 0.01 Morphology: GRANULAR-ELONGATE
Alteration - CARBONATE
Location: VESICLES
CLAY MINERALS
Location: VESICLES Replacing: OL,OL PHENOS
OL PHENOS ARE ALTERED TO SMECTITE*
Vesicles -
Size(mm): <1
Percent: 2
Filling: CALCITE,SMEC
Shape: ROUNDED
Leg : 53 Top/Bottom Interval(mm): 1230/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 667.00 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 669.73 Sect/Pc #: 2/PCE 7A
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
ALL GROUNDMASS IS CRYPTOCRYSTALLINE AND
VARIOLITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
MOST NEARLY COMPLETELY ALTERED TO SMECTITE BUT
SOME FRESH;
PLAGIOCLASE ( 10%)
Size(mm): TO 2.5 Morphology: SUBHEDRAL
MODERATE TO STRONG NORMAL ZONING AT EDGE*
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): TO 0.3 Morphology: SKELETAL
CLINOPYROXENE ( 72%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( <1%)
Size(mm): .03
PYRITE
IDENTITY UNCERTAIN FOR PYRITE*
Alteration - CARBONATE
Location: VESICLES, Replacing: OL,OL PHENOS
Location: GROUNDMASS
SMECTITE
Location: VESICLES, Replacing: OL
Location: GROUNDMASS
Vesicles -
Size(mm): 0.7
Percent: 1
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1220/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 667.00 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 671.22 Sect/Pc #: 3/PCE 4E
ROCK = PLAG-OL PHYRIC BASALT
ALTERED;
Texture: PORPHYRITIC,APHANITIC,QUENCH*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 1-2 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 20%)
Size(mm): 2 Morphology: SUBHEDRAL
GLOMEROCRYSTS,PARTLY ALTERED*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.4 Morphology: SKELETAL
CLINOPYROXENE ( 48%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 8%)
Size(mm): 0.05 Morphology: LATHS
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: PHENOS, Replacing: OL PHENOS
Location: VEINLETS
SMECTITE
Location: VESICLES, Replacing: OL,GLASS
Location: VEINLETS,
Location: GROUNDMASS
OXIDIZED IN VEINLETS*
Vesicles -
Size(mm): 0.3
Percent: 2
Filling: SMEC,CARB,
Shape: ROUND
Filling: SILICA
Leg : 53 Top/Bottom Interval(mm): 1420/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 667.00 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 671.42 Sect/Pc #: 3/PCE 5
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 0.6 Morphology: EUHEDRAL
COMPLETELY ALTERED TO SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): 3-5 Morphology: EUHEDRAL
MODERATE TO EXTREME NORMAL ZONING AT THE RIMS,
FRESH;
CLINOPYROXENE ( TR%)
Size(mm): 0.2 Morphology: ROUNDED
FRESH*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): TO 0.5 Morphology: ACICULAR
FINELY CRYSTALLINE;
CLINOPYROXENE ( 46%)
Morphology: RADIATING SHEAVES
FINELY CRYSTALLINE;
OPAQUE MINERALS ( 8%)
Size(mm): .01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE,FINELY CRYSTALLINE*
Alteration - SMECTITE
Replacing: OLIVINE
CARBONATE
Location: VESICLES
Vesicles -
Size(mm): TO 0.5
Percent: <1
Filling: SMEC,CALCITE
Leg : 53 Top/Bottom Interval(mm): 340/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 667.00 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 671.84 Sect/Pc #: 4/PCE 1D
ROCK = PLAG MODERATELY PHYRIC BASALT
THE ROCK CONTAINS A LARGE (UP TO 4 MM THICK) VEIN
THAT COMPRISES 10% OF THE ROCK. THE VEIN CONTAINS
ANGULAR FRAGMENTS OF PLAG AND GROUNDMASS WHICH
MIGHT HAVE BEEN BRECCIATED,SHIPBOARD DESCRIPTION
(UNEDITED);
Texture: MODERATELY PORPHYRITIC,QUENCH,HIGHLY VESICULAR;
Where sampled: TOP OF UNIT 9--PROBABLY A FLOW*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): <1.5 Morphology: EUHEDRAL
FRESH*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): <1 Morphology: ACICULAR
FRESH;
CLINOPYROXENE ( 30%)
Size(mm): <0.5 Morphology: GRANULAR-ACICULAR
FRESH;
OPAQUE MINERALS ( 5%)
Size(mm): <0.5 Morphology: GRANULAR-ELONGATE
INCLUDES MAGN + ILMENITE;
GLASS ( 5%)
DEVITRIFIED*
Alteration - CARBONATE ( 10%)
Location: VEIN,VESICLES
SMECTITE ( 20%)
Location: VEIN,VESICLES
THE ROCK CONTAINS A LARGE (4 MM THICK) VEIN
FILLED WITH GREEN SMEC IN THE MARGINS AND NEARLY
COLORLESS SMEC + QUARTZ IN THE CENTER;
QUARTZ ( 5%)
Location: VEIN,VESICLES
THE ROCK CONTAINS A LARGE (4 MM THICK) VEIN
FILLED WITH GREEN SMEC IN THE MARGINS AND NEARLY
COLORLESS SMEC + QUARTZ IN THE CENTER*
Vesicles -
Size(mm): <1
Percent: 10
Filling: SMEC,CALCITE,
Shape: ROUND
Filling: QUARTZ
THE ROCK CONTAINS A LARGE (4 MM THICK) VEIN.
UNTIL A DISTANCE OF 0.5 CM FROM THE VEIN THE
VESICLES OF THE BASALT ARE FILLED WITH SMECTITE.
FURTHER AWAY THEY ARE FILLED WITH CALCITE +
QUARTZ,THERE IS ALSO FE OXIDE WITH OTHER MINERALS
AS FILLING*
Leg : 53 Top/Bottom Interval(mm): 490/ 0 Describer: Flower, M.
Hole: 418A Top of Core Depth(m) : 667.00 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 671.99 Sect/Pc #: 4/PCE 1E
ROCK = PLAG MODERATELY PHYRIC BASALT
VEINED BASALT;
Texture: PORPHYRITIC,VESICULAR,QUENCH;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 8%)
Size(mm): TO 1.5 Morphology: SUBHEDRAL
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): 0.5 Morphology: EUHEDRAL,SKELETAL
COARSE-GRAINED;
CLINOPYROXENE ( 30%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 8%)
Size(mm): 0.03 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE,FAIRLY COARSE GRAINED;
GLASS ( 14%)
Alteration - CARBONATE
Location: VEINS, Replacing: VOIDS,FISSURES,OL
Location: VESICLES,
Location: GROUNDMASS
SMECTITE ( 5-10%)
Location: VESICLES Replacing: VOIDS,GLASS
GREEN SMECTITE,SOMETIMES OXIDIZED,CAN EITHER FILL
VESICLES TOTALLY OR JUST LINE THEM*
Vesicles -
Size(mm): 1
Percent: 10-20
Filling: SMEC,CARB
Shape: ROUND
PROMINENT,CARB CAN BE PRESENT OR ABSENT AS A
FILLING*
Leg : 53 Top/Bottom Interval(mm): 1320/ 0 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 667.00 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 672.82 Sect/Pc #: 4/PCE 1L
ROCK = PLAG MODERATELY PHYRIC BASALT
VESICULAR;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): 4 Morphology: SUBHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): 0.4 Morphology: EUHEDRAL
PLAGIOCLASE ( 30%)
Size(mm): 0.5 Morphology: EUHEDRAL
CLINOPYROXENE ( 15%)
Size(mm): 0.5 Morphology: ANHEDRAL
MAGNETITE ( 5%)
Size(mm): 0.1 Morphology: SUBHEDRAL
SMECTITE ( 20%)
Alteration - SMECTITE
Location: GROUNDMASS Replacing: OLIVINE
Vesicles -
Size(mm): 0.8-1.3
Percent: 20
Filling: SMEC,CALCITE
Shape: ROUND
MOSTLY SMEC LESS CALCITE*
Leg : 53 Top/Bottom Interval(mm): 250/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 667.00 Rock Type: IGNEOUS
Core: 60 Sample Midpoint(m) : 673.25 Sect/Pc #: 5/PCE 1B
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: SUBOPHITIC-INTERSERTAL,HIGHLY VESICULAR,
Piece #: HYRITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 4%)
Size(mm): TO 4 Morphology: EUHEDRAL
FRESH,ZONED*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 1 Morphology: EUHEDRAL
FRESH,ZONED;
CLINOPYROXENE ( 30%)
Size(mm): TO 0.8
SUBOPHITIC,FRESH;
OPAQUE MINERALS ( 8%)
Size(mm): 0.1 Morphology: GRANULAR,ELONGATE
INCLUDES MAGN + ILMENITE,<0.1 MM IN DIAMETER AND
<0.2 MM IN LENGTH;
GLASS ( 18%)
PARTIALLY DEVITRIFIED,ALTERED TO SMECTITE*
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Location: VESICLES Replacing: GLASS
Vesicles -
Size(mm): TO 7
Percent: 10
Filling: CALCITE,SMEC
Shape: ROUND
FILLING IS CALCITE AND/OR SMEC,SOME VESICLES ARE
PARTIALLY FILLED WITH VERY FINE-GRAINED
GROUNDMASS*
Leg : 53 Top/Bottom Interval(mm): 60/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 676.50 Rock Type: IGNEOUS
Core: 61 Sample Midpoint(m) : 676.56 Sect/Pc #: 1/PCE 1
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL
GROUNDMASS IS COARSE,POORLY DEVELOPED DIABASIC;
Where sampled: FLOW INTERIOR
UNCERTAIN WHERE SAMPLED*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): TO 4 Morphology: EUHEDRAL-SUBHEDRAL
STRONG NORMAL ZONING AT EDGES,FRESH*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): <0.5 Morphology: EUHEDRAL-SUBHEDRAL,
Morphology: INTERGRANULAR-DENDRITIC,
Morphology: SUBOPHITIC CLOTS
FRESH,ZONED;
CLINOPYROXENE ( 30%)
Size(mm): TO 0.5 Morphology: SUBHEDRAL,SUBOPHITIC CLOTS,
Morphology: INTERGRANULAR-DENDRITIC
FRESH;
OPAQUE MINERALS ( 5%)
Size(mm): TO 0.2 Morphology: LATHS,OCTAHEDRA
INCLUDES MAGN + ILMENITE;
GLASS ( 9%)
DEVITRIFIED,WEATHERED,INTERSTITIAL;
OLIVINE ( 5%)
Size(mm): 0.5 Morphology: EUHEDRAL
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Location: GROUNDMASS, Replacing: OL
Location: VESICLES
Vesicles -
Size(mm): 0.6
Percent: 1
Filling: SMEC,CALCITE
Shape: ROUND
THE RIMS ARE SMEC WITH THE CENTER CALCITE*
Leg : 53 Top/Bottom Interval(mm): 290/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 676.50 Rock Type: IGNEOUS
Core: 61 Sample Midpoint(m) : 676.79 Sect/Pc #: 1/PCE 2
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): <2.2 Morphology: SUBHEDRAL
APPROX COMP AN68-COMPOSITION OF CORE,ALBITE
TWINNING,FRESH,ZONED*
Groundmass - PLAGIOCLASE ( 25%)
Size(mm): 0.3 Morphology: EUHEDRAL
FRESH;
OLIVINE ( 10%)
Size(mm): 0.5 Morphology: SUBHEDRAL
CLINOPYROXENE ( 35%)
Size(mm): TO 0.2 Morphology: GRANULAR-RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITE;
GLASS ( 10%)
DEVITRIFIED,WEATHERED TO SMECTITE*
Alteration - CARBONATE ( 5%)
Location: VESICLES
SMECTITE ( 30%)
Location: GROUNDMASS Replacing: OL,GLASS
Vesicles -
Size(mm): 0.6
Percent: <1
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1000/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 676.50 Rock Type: IGNEOUS
Core: 61 Sample Midpoint(m) : 677.50 Sect/Pc #: 1/PCE 6
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): TO 3 Morphology: EUHEDRAL
FOUND IN GLOMEROCRYSTS,FRESH,GLASSY INCLUSIONS
PRESENT,ZONED*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.5 Morphology: EUHEDRAL LATHS
CLINOPYROXENE ( 40%)
Size(mm): <0.2 Morphology: GRANULAR-SUBOPHITIC
MAGNETITE ( 5%)
Morphology: GRANULAR,ELONGATE
GLASS ( 17%)
DEVITRIFIED OR ALTERED TO SMECTITE,INTERSTITIAL;
OLIVINE ( 3%)
Size(mm): 0.4 Morphology: EUHEDRAL
Alteration - SMECTITE ( 10%)
Location: VEIN Replacing: OL,OL PHENOS,GLASS
Vesicles -
Size(mm): 0.3
Percent: <1
Filling: SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1140/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 686.00 Rock Type: IGNEOUS
Core: 62 Sample Midpoint(m) : 687.14 Sect/Pc #: 1/PCE 4B
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 0.7 Morphology: SUBHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 5%)
Size(mm): <3 Morphology: SUBHEDRAL
FRESH*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 35%)
Size(mm): 0.1 Morphology: GRANULAR,SHEAVES
MAGNETITE ( 5%)
Size(mm): 0.05 Morphology: LATHS
GLASS ( 18%)
ALTERED TO SMECTITE,INTERSTITIAL;
OLIVINE ( 3%)
Size(mm): 0.2 Morphology: SUBHEDRAL
Alteration - CARBONATE
Location: VESICLES Replacing: OL,OL PHENOS
IN PATCHES;
SMECTITE
Location: VESICLES Replacing: OL,OL PHENOS
Vesicles -
Size(mm): 0.5
Percent: <1
Filling: SMEC,CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 400/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 686.00 Rock Type: IGNEOUS
Core: 62 Sample Midpoint(m) : 689.40 Sect/Pc #: 3/PCE 3
ROCK = PLAG-OL MODERATELY PHYRIC BASALT
Texture: MODERATELY PORPHYRITIC,QUENCH
GROUNDMASS IS VERY FINE GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.5 Morphology: SUBHEDRAL
ALTERED TO CALCITE,ID UNCERTAIN;
PLAGIOCLASE ( 5%)
Size(mm): TO 1 Morphology: EUHEDRAL
FRESH,ZONED*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): TO 0.5 Morphology: ACICULAR
FRESH;
CLINOPYROXENE ( 70%)
Morphology: ACICULAR,SHEAVES
CPX IS ACICULAR OR SHEAFED,POORLY XTLLIZED;
OPAQUE MINERALS ( 8%)
Size(mm): 0.01 Morphology: GRANULAR
Alteration - CALCITE
Location: VESICLES Replacing: OL PHENOS,INTERSTITIAL
Replacing: MATERIAL
Vesicles -
Size(mm): <1
Percent: 2
Filling: CALCITE
Shape: ROUND
PARTLY FILLED WITH VERY FINE-GRAINED GROUNDMASS
WHICH ALWAYS SEEMS TO HAVE THE SAME ORIENTATION
WITH RESPECT TO THE CALCITE FILLING*
Leg : 53 Top/Bottom Interval(mm): 600/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 686.00 Rock Type: IGNEOUS
Core: 62 Sample Midpoint(m) : 692.60 Sect/Pc #: 5/PCE 4
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.6 Morphology: EUHEDRAL
PLAGIOCLASE ( 5%)
Size(mm): TO 2 Morphology: SUBHEDRAL
STRONG NORMAL ZONING AT EDGES,FRESH*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 50%)
Size(mm): 0.1 Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): 0.02 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES, Replacing: OL PHENOS,GROUNDMASS
Location: VEINLETS,
Location: GROUNDMASS
OCCURS AS PATCHES IN THE GROUNDMASS*
Vesicles -
Size(mm): 0.5
Percent: <1
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 900/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 690.00 Rock Type: IGNEOUS
Core: 63 Sample Midpoint(m) : 692.40 Sect/Pc #: 2/PCE 3D
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS VERY FINE GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.5 Morphology: EUHEDRAL
POSSIBLY ALTERED TO SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): TO 4 Morphology: EUHEDRAL
FRESH,GLASS INCLUSIONS,ZONED;
CLINOPYROXENE ( 1%)
Size(mm): TO 0.5 Morphology: ANHEDRAL
FRESH,SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 35%)
Size(mm): 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 40%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 11%)
Size(mm): 0.05 Morphology: GRANULAR
Alteration - CARBONATE
Location: VESICLES,
Location: VEINS
SMECTITE
Location: VESICLES, Replacing: OL,OL PHENOS
Location: VEINS
Vesicles -
Size(mm): TO 0.3
Percent: 1
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 860/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 690.00 Rock Type: IGNEOUS
Core: 63 Sample Midpoint(m) : 693.86 Sect/Pc #: 3/PCE 6
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,QUENCH
GROUNDMASS IS RATHER COARSE GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): <1 Morphology: SUBHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 5%)
Size(mm): <2 Morphology: SUBHEDRAL
FRESH,INCLUSIONS,ZONED*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.3 Morphology: SUBHEDRAL
FRESH;
CLINOPYROXENE ( 35%)
Morphology: RADIATING SHEAVES
FRESH;
MAGNETITE ( 10%)
Size(mm): 0.1 Morphology: LATHS
GLASS ( 17%)
INTERSTITIAL*
Alteration - SMECTITE
Location: VESICLES Replacing: OL,OL PHENOS
Vesicles -
Size(mm): 0.5
Percent: 1
Filling: SMECTITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 140/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 690.00 Rock Type: IGNEOUS
Core: 63 Sample Midpoint(m) : 696.14 Sect/Pc #: 5/PCE 1
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS VERY FINE GRAINED;
Where sampled: NEAR THE GLASSY MARGIN OF A FLOW*
Phenocrysts- OLIVINE ( 1%)
Size(mm): <1 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): <3 Morphology: EUHEDRAL
FRESH,SOME WITH GLASS INCLUSIONS,ZONED*
CLINOPYROXENE ( <1%)
Size(mm): <0.5 Morphology: SUBOPHITIC
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.3 Morphology: ACICULAR
FRESH;
CLINOPYROXENE ( 45%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 8%)
Size(mm): 0.01 Morphology: GRANULAR
GLASS ( 4%)
ALTERED TO SMECTITE*
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Replacing: OL,OL PHENOS,GLASS
Vesicles -
Size(mm): 0.25
Percent: 2
Location: GROUNDMASS
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 140/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 695.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 695.64 Sect/Pc #: 1/PCE 1A
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERSERTAL-SUBOPHITIC
GROUNDMASS IS COARSE GRAINED;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 1 Morphology: EUHEDRAL
POSSIBLY NOW ALTERED TO SMECTITE;
PLAGIOCLASE ( 15%)
Size(mm): <4 Morphology: EUHEDRAL
FRESH,STRONG NORMAL ZONING,GLASS INCLUSIONS*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.5 Morphology: SUBHEDRAL
CLINOPYROXENE ( 30%)
Size(mm): 0.2 Morphology: GRANULAR-SUBOPHITIC
FRESH;
OPAQUE MINERALS ( 6%)
Size(mm): 0.05 Morphology: EUHEDRAL
GLASS ( 14%)
INTERSTITIAL*
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Location: VESICLES Replacing: OL PHENOS
Vesicles -
Size(mm): 0.4
Percent: 2
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1300/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 695.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 698.30 Sect/Pc #: 2/PCE 1I
ROCK = PLAG-CPX-OL PHYRIC BASALT
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS ESSENTIALLY CRYPTOCRYSTALLINE;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 0.6 Morphology: EUHEDRAL
PLAGIOCLASE ( 10%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
CLINOPYROXENE ( <1%)
Size(mm): TO 1 Morphology: SUBOPHITIC
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): TO 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 65%)
Morphology: DENDRITIC,RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): 0.01 Morphology: GRANULAR
Alteration - CARBONATE
Location: VEIN
THICK VEIN OF CALCITE WITH FRAGMENTS OF
BRECCIATED PLAGIOCLASE PRESENT;
SMECTITE
Replacing: GROUNDMASS
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 570/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 695.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 699.07 Sect/Pc #: 3/PCE 1F
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,GLASSY-QUENCH;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): TO 1 Morphology: EUHEDRAL
GENERALLY REPLACED BY SMECTITE + CALCITE (CALCITE
IN PARTICULAR), ONE FRESH OL IN THE GLASSY MARGIN;
PLAGIOCLASE ( 15%)
Size(mm): <2 Morphology: EUHEDRAL
CLINOPYROXENE ( TR%)
Size(mm): 0.5 Morphology: ROUNDED
Groundmass - GLASS ( 84%)
FRESH GLASS AT THE EDGE OF THE SECTION,PARTLY
DEVITRIFIED*
Alteration - CARBONATE
Replacing: OL PHENOS
OL PHENOS GENERALLY REPLACED BY SMECTITE +
ESPECIALLY CALCITE;
SMECTITE
Replacing: OL PHENOS
OL PHENOS GENERALLY REPLACED BY SMECTITE +
ESPECIALLY CALCITE*
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 580/ 610 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 695.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 699.10 Sect/Pc #: 3/PCE 1F
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: MODERATELY PORPHYRITIC,QUENCH;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE
Size(mm): 0.5
ALTERED TO CALCITE + MINOR SMECTITE;
PLAGIOCLASE ( 15%)
Size(mm): <2
CLINOPYROXENE ( <1%)
Size(mm): <1 Morphology: ROUNDED
Groundmass - SULFIDE
Size(mm): 0.3
IN THE GROUNDMASS*
Alteration - CARBONATE
Replacing: OL PHENOS
OL PHENOS ARE ALTERED TO CALCITE + MINOR SMECTITE;
SMECTITE
Replacing: OL PHENOS
OL PHENOS ARE ALTERED TO CALCITE + MINOR SMECTITE*
Leg : 53 Top/Bottom Interval(mm): 1170/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 695.50 Rock Type: IGNEOUS
Core: 64 Sample Midpoint(m) : 701.17 Sect/Pc #: 4/PCE 2H
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS VERY FINE GRAINED;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): TO 1 Morphology: EUHEDRAL
REPLACED BY CALCITE;
PLAGIOCLASE ( 15%)
Size(mm): TO 3 Morphology: EUHEDRAL
GENERALLY FRESH BUT PARTLY ALTERED TO SMECTITE;
CLINOPYROXENE ( <1%)
Size(mm): 0.5 Morphology: ANHEDRAL
SUBOPHITIC GLOMEROCRYSTS*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.7 Morphology: ACICULAR
CLINOPYROXENE ( 60%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 4%)
Size(mm): 0.01 Morphology: GRANULAR
Alteration - CALCITE
Location: VESICLES Replacing: OL PHENOS
Vesicles -
Size(mm): 0.5
Percent: U
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 360/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 705.10 Rock Type: IGNEOUS
Core: 65 Sample Midpoint(m) : 708.46 Sect/Pc #: 3/PCE 3
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): TO 1 Morphology: EUHEDRAL
( BY C%)
Size(mm): ALCITE + S Morphology: MECTITE;
PLAGIOCLASE ( 12%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
PARTIALLY ALTERED TO ?;
CLINOPYROXENE ( <1%)
Size(mm): TO 0.4 Morphology: ANHEDRAL
SUBOPHITIC GLOMEROCRYSTS*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): <0.5 Morphology: SKELETAL
CLINOPYROXENE ( 70%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 3%)
Size(mm): 0.01 Morphology: GRANULAR
Alteration - CALCITE
Replacing: OL PHENOS
OL PHENOS REPLACED BY CALCITE + MINOR SMEC*
SMECTITE
Replacing: OL
OL PHENOS REPLACED BY CALCITE + MINOR SMEC*
Vesicles -
Size(mm): .2
Percent: 1
Shape: IRREGULAR
Leg : 53 Top/Bottom Interval(mm): 150/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 705.10 Rock Type: IGNEOUS
Core: 65 Sample Midpoint(m) : 711.25 Sect/Pc #: 5/PCE 1A
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 7%)
Size(mm): TO 2.5 Morphology: SUBHEDRAL
PARTLY ALTERED;
CLINOPYROXENE ( <1%)
Size(mm): 0.5 Morphology: SUBOPHITIC,ROUNDED
SMALL SUBOPHITIC GLOMEROCRYSTS AND ALSO ROUNDED
PHENOCRYSTS*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.5 Morphology: ACICULAR
OLIVINE ( 1%)
Size(mm): 0.2
ID UNCERTAIN FOR OL;
OPAQUE MINERALS ( 6%)
Size(mm): .02 Morphology: GRANULAR
CLINOPYROXENE ( 65%)
Morphology: RADIATING SHEAVES
Alteration - SMECTITE
Replacing: OL PHENOS
OL PHENOS ARE ALTERED TO SMEC,ID UNCERTAIN FOR OL*
Vesicles -
Size(mm): 0.2
Percent: <1
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 530/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 705.10 Rock Type: IGNEOUS
Core: 65 Sample Midpoint(m) : 713.13 Sect/Pc #: 6/PCE 4
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT
SHIPBOARD DESCRIPTION(UNEDITED);
Texture: MODERATELY PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): <0.07 Morphology: EUHEDRAL
REPLACED BY CALCITE + SMECTITE;
PLAGIOCLASE ( 5%)
Size(mm): <1.5
CLINOPYROXENE ( 1%)
Size(mm): <0.7 Morphology: SUBOPHITIC-ROUNDED
Alteration - CALCITE
Replacing: OL PHENOS
OL PHENOS ARE ALTERED TO CALCITE + SMEC;
SMECTITE
Replacing: OL PHENOS
OL PHENOS ARE ALTERED TO CALCITE + SMEC*
Leg : 53 Top/Bottom Interval(mm): 350/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 714.60 Rock Type: IGNEOUS
Core: 66 Sample Midpoint(m) : 716.45 Sect/Pc #: 2/PCE 1C
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): TO 0.7 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): TO 2.5 Morphology: EUHEDRAL
FRESH,SERIATE;
CLINOPYROXENE ( 4%)
Size(mm): TO 2 Morphology: SUBHEDRAL-SUBOPHITIC CLOTS
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.1 Morphology: ACICULAR
CLINOPYROXENE ( 55%)
Size(mm): <0.2 Morphology: GRANULAR-DENDRITIC
OPAQUE MINERALS ( 8-10%)
Size(mm): <0.05 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES,
SMECTITE
Replacing: OL,OL PHENOS
Vesicles -
Size(mm): 0.5
Percent: 1
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 470/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 714.60 Rock Type: IGNEOUS
Core: 66 Sample Midpoint(m) : 719.57 Sect/Pc #: 4/PCE 2C
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): <1.5 Morphology: EUHEDRAL
REPLACED BY SMECTITE + CALCITE;
PLAGIOCLASE ( 20%)
Size(mm): TO 4 Morphology: EUHEDRAL
IN GLOMEROCRYSTS,FRESH,SOME GLASSY INCLUSIONS,
ZONED;
CLINOPYROXENE ( 4%)
Size(mm): <1.5 Morphology: ROUNDED,SUBOPHITIC CLOTS
FRESH*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.3 Morphology: ACICULAR
FRESH;
CLINOPYROXENE ( 56%)
Size(mm): <0.05 Morphology: RADIATING SHEAVES
FRESH;
OPAQUE MINERALS ( 6%)
Size(mm): 0.02 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Replacing: OL PHENOS
ALSO MINOR INTERSTITIAL MATERIAL TO SMEC*
Vesicles -
Size(mm): 0.3
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1440/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 714.60 Rock Type: IGNEOUS
Core: 66 Sample Midpoint(m) : 722.04 Sect/Pc #: 5/PCE 6D
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 0.8 Morphology: EUHEDRAL
ALTERED TO SMECTITE*
PLAGIOCLASE ( 10%)
Size(mm): TO 3.5 Morphology: USUALLY EUHEDRAL
ONE CORRODED CRYSTAL WITH STRONG NORMAL ZONING,
FRESH*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.2 Morphology: ACICULAR
FRESH;
CLINOPYROXENE ( 46%)
Size(mm): <0.05 Morphology: RADIATING SHEAVES
FRESH;
OPAQUE MINERALS ( 10%)
Size(mm): 0.03 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CALCITE
Location: VESICLES
SMECTITE
Location: VESICLES Replacing: OL,OL PHENOS,GROUNDMASS
Vesicles -
Percent: 1
Location: 0.8
Filling: SMEC,CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1230/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 724.10 Rock Type: IGNEOUS
Core: 67 Sample Midpoint(m) : 725.33 Sect/Pc #: 1/PCE 3A
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): TO 0.5 Morphology: EUHEDRAL
REPLACED BY SMECTITE;
PLAGIOCLASE ( 15%)
Size(mm): TO 2.5 Morphology: EUHEDRAL,RARELY ROUNDED
FRESH,ZONED;
CLINOPYROXENE ( 3%)
Size(mm): <2 Morphology: SUBHEDRAL,SUBOPHITIC
IN BIG SUBHEDRAL CRYSTALS OR SMALLER SUBOPHITIC
CLOTS,FRESH*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): <0.5 Morphology: ACICULAR
FRESH,MEDIUM GRAINED;
CLINOPYROXENE ( 47%)
Size(mm): <0.2 Morphology: RADIATING SHEAVES
FRESH,MEDIUM GRAINED;
OPAQUE MINERALS ( 10%)
Size(mm): <0.05 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE;
OLIVINE ( 3%)
Size(mm): 0.2 Morphology: SUBHEDRAL
Alteration - CARBONATE
Location: VEIN
VEIN (1 MM) FILLED WITH CALCITE + SULFIDE
(PYRITE?), PYRITE IN A PLAG PHENO NEAR THE VEIN;
SULFIDE
Location: VEIN
VEIN (1 MM) FILLED WITH CALCITE + SULFIDE
(PYRITE?). PYRITE IN A PLAG PHENO NEAR THE VEIN;
SMECTITE
Replacing: OL PHENOS,GLASS
Vesicles -
Size(mm): 0.2
Percent: 1
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 470/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 724.10 Rock Type: IGNEOUS
Core: 67 Sample Midpoint(m) : 727.57 Sect/Pc #: 3/PCE 2B
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH-SUBOPHITIC,INTERSERTAL
GROUNDMASS IS COARSE GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): TO 1 Morphology: EUHEDRAL
REPLACED BY SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): TO 4 Morphology: EUHEDRAL
FRESH,ZONED;
CLINOPYROXENE ( 5%)
Size(mm): TO 2 Morphology: SUBHEDRAL-ROUNDED
FRESH*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.15 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 30%)
Size(mm): 0.5 Morphology: SUBHEDRAL
FRESH;
CLINOPYROXENE ( 35%)
Size(mm): 0.5 Morphology: GRANULAR
FRESH;
OPAQUE MINERALS ( 4%)
Size(mm): 0.05 Morphology: EUHEDRAL
INCLUDES MAGN + ILMENITE;
GLASS ( 5%)
DEVITRIFIED*
Alteration - CARBONATE
Location: VEIN
THIN VEIN OF CALCITE;
CLAY MINERALS
Replacing: OL,OL PHENOS,GLASS
OL AND OL PHENOS ARE ALTERED TO SMEC*
Vesicles -
Size(mm): 0.5
Percent: <1
Filling: SMEC,CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1150/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 729.10 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 730.25 Sect/Pc #: 1/PCE 2H
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): <1.5 Morphology: EUHEDRAL
REPLACED BY SMECTITE AND MAYBE QUARTZ(?);
PLAGIOCLASE ( 15%)
Size(mm): <3 Morphology: EUHEDRAL
CLINOPYROXENE ( 5%)
Size(mm): TO 1.5 Morphology: ANHEDRAL-ROUNDED
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): TO 0.6 Morphology: ACICULAR
CLINOPYROXENE ( 57%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 7%)
Size(mm): 0.05 Morphology: GRANULAR-EUHEDRAL
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES,VEIN
FOUND IN VESICLES AND ONE THIN VEIN;
SMECTITE
Replacing: OL PHENOS,OL
OL PHENOS REPLACED BY SMEC + (QUARTZ?)*
Vesicles -
Size(mm): <0.4
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1250/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 729.10 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 731.85 Sect/Pc #: 2/PCE 3E
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): <1.5 Morphology: EUHEDRAL
REPLACED BY CALCITE + SMECTITE;
PLAGIOCLASE ( 15%)
Size(mm): 3-5 Morphology: EUHEDRAL
FRESH,WITH A FEW GLASSY INCLUSIONS,ZONED;
CLINOPYROXENE ( 5%)
Size(mm): <2.5 Morphology: ROUNDED,SUBOPHITIC CLOTS
ROUNDED OR SUBOPHITIC CLOTS WITH PLAG,QUITE FRESH*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): 0.3 Morphology: SKELETAL
CLINOPYROXENE ( 57%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 6%)
Size(mm): 0.05 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: VESICLES Replacing: OL,OL PHENOS
SMECTITE
Location: VEIN Replacing: OL,OL PHENOS
A VEIN OF GREEN SMEC + QUARTZ IS ON THE EDGE OF
THE SECTION;
QUARTZ
Location: VEIN
A VEIN OF GREEN SMEC + QUARTZ IS ON THE EDGE OF
THE SECTION*
Vesicles -
Size(mm): 0.5
Percent: 2
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 410/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 729.10 Rock Type: IGNEOUS
Core: 68 Sample Midpoint(m) : 732.51 Sect/Pc #: 3/PCE 3A
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,GLASSY-VARIOLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): TO 1 Morphology: EUHEDRAL
UNCERTAIN ABOUT MORPHOLOGY,ALTERED TO SMECTITE*
PLAGIOCLASE ( 10%)
Size(mm): <5 Morphology: EUHEDRAL
FRESH,ZONED;
CLINOPYROXENE ( 2%)
Size(mm): TO 1.5 Morphology: ROUNDED
FRESH*
Groundmass - GLASS ( 87%)
MOSTLY FRESH*
Alteration - SMECTITE
Location: VEIN Replacing: OL,OL PHENOS
VEIN FILLED WITH SMEC*
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 480/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 733.60 Rock Type: IGNEOUS
Core: 69 Sample Midpoint(m) : 734.08 Sect/Pc #: 1/PCE 1D
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
VERY FINE-GRAINED GROUNDMASS WITH PLAG-CPX
INTERGROWTHS*
Phenocrysts- OLIVINE ( 2%)
Size(mm): <1 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 15%)
Size(mm): <4 Morphology: EUHEDRAL
FRESH,TWO BIG GLOMEROCRYSTS--ONE UP TO 1.5 MM,
RICH IN INCLUSIONS;
CLINOPYROXENE ( 4-5%)
Size(mm): <5 Morphology: SUBOPHITIC CLOTS,SUBHEDRAL
USUALLY IN SUBOPHITIC CLOTS WITH PLAG,ONE BIG
SUBHEDRAL XTL*
Groundmass - MAGNETITE ( 7-8%)
Size(mm): 0.03 Morphology: GRANULAR
OLIVINE ( 1%)
Size(mm): 0.2 Morphology: SUBHEDRAL
PLAGIOCLASE ( 25%)
Size(mm): TO 0.4 Morphology: ACICULAR
CLINOPYROXENE ( 44%)
Morphology: RADIATING SHEAVES
Alteration - CARBONATE
Location: VESICLES,
Location: PATCHES
SMECTITE
Location: VESICLES Replacing: OL PHENOS
Vesicles -
Percent: 1
Location: TO 0.5
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1180/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 733.60 Rock Type: IGNEOUS
Core: 69 Sample Midpoint(m) : 736.28 Sect/Pc #: 2/PCE 2I
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS FINE-GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 4%)
Size(mm): <1.5 Morphology: EUHEDRAL
REPLACED BY SMECTITE + QUARTZ(?);
PLAGIOCLASE ( 10%)
Size(mm): <3 Morphology: EUHEDRAL
FRESH,ZONED;
CLINOPYROXENE ( 3%)
Size(mm): TO 2.5 Morphology: SUBHEDRAL,ROUNDED
FRESH*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 67%)
Morphology: DENDRITIC,RADIATING SHEAVES
OPAQUE MINERALS ( 6%)
Size(mm): 0.05 Morphology: GRANULAR
Alteration - SMECTITE
Replacing: OL PHENOS,INTERSTITIAL
CARBONATE
Location: VESICLES
Vesicles -
Size(mm): 0.3
Percent: <1
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 700/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 733.60 Rock Type: IGNEOUS
Core: 69 Sample Midpoint(m) : 738.80 Sect/Pc #: 4/PCE 6A
ROCK = PLAG-CPX-OL BASALT;
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS VERY FINE-GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): <1 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): <4 Morphology: EUHEDRAL
GLOMEROCRYSTS,FRESH,ZONED;
CLINOPYROXENE ( 3-4%)
Size(mm): TO 0.7 Morphology: SUBOPHITIC CLOTS,ANHEDRAL
FRESH*
Groundmass - PLAGIOCLASE ( 20%)
Size(mm): 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 56%)
Morphology: RADIATING SHEAVES
MAGNETITE ( 6-8%)
Morphology: GRANULAR,LATH-SHAPED
Alteration - SMECTITE
Replacing: OL PHENOS,GLASS
CARBONATE
Location: VESICLES
Vesicles -
Size(mm): 0.2
Percent: 1
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 600/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 743.10 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 745.20 Sect/Pc #: 2/PCE 1D
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
VERY FINE-GRAINED QUENCH GROUNDMASS;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.5-1 Morphology: EUHEDRAL
PLAGIOCLASE ( 15%)
Size(mm): <4 Morphology: EUHEDRAL
CLINOPYROXENE ( 4%)
Size(mm): <2.5 Morphology: SUBHEDRAL,SUBOPHITIC CLOTS
FRESH*
Groundmass - MAGNETITE ( 8%)
Size(mm): 0.02 Morphology: EUHEDRAL,GRANULAR
OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
PLAGIOCLASE ( 25%)
Size(mm): 0.4 Morphology: ACICULAR
CLINOPYROXENE ( 43%)
Morphology: RADIATING SHEAVES
Alteration - SMECTITE
Replacing: OL PHENOS
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 740/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 743.10 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 748.34 Sect/Pc #: 4/PCE 2
ROCK = PLAG-OL PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: PORPHYRITIC
RELATIVELY COARSE GROUNDMASS (0.1-0.5 MM) OF
DIABASIC TO SUBOPHITIC CPX-PLAG + GRANULAR OXIDES
+ MINOR INTERSERTAL GLASS (ALTERED),THE RATIO OF
PLAG:CPX IS 1:1.5,GROUNDMASS IS RELATIVELY FRESH*
Phenocrysts- OLIVINE ( 4-7%)
Size(mm): TO 1 Morphology: EUHEDRAL
REPLACED BY CALCITE + SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): 0.5-2.5 Morphology: EUHEDRAL
SOME PARTIALLY ALTERED TO CLAY?;
CLINOPYROXENE
Size(mm): <0.6 Morphology: ANHEDRAL-SUBHEDRAL
GRADES IN SIZE TO GROUNDMASS--NOT CLEAR WHETHER
IT IS IN FACT A PHENOCRYST PHASE,FRESH,SUBOPHITIC
CLOTS*
Groundmass - PLAGIOCLASE
DIABASIC TO SUBOPHITIC CPX-PLAG,THE RATIO OF
PLAG:CPX IS 1:1.5;
CLINOPYROXENE
DIABASIC TO SUBOPHITIC CPX-PLAG,THE RATIO OF
PLAG:CPX IS 1:1.5;
OPAQUE MINERALS ( 8%)
INCLUDES MAGN + ILMENITE;
GLASS
INTERSERTAL,MINOR,ALTERED*
Alteration - CALCITE
Replacing: OL PHENOS
CLAY MINERALS
Replacing: OL PHENOS,PLAG PHENOS
UNCERTAIN ABOUT SOME PLAG PHENOS PARTIALLY
ALTERED TO CLAY,OL PHENOS ALTERED TO CALCITE +
SMEC*
Vesicles -
Size(mm): 0.8-1.4
Percent: <2
Filling: CALCITE,SMEC
Leg : 53 Top/Bottom Interval(mm): 920/ 940 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 743.10 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 748.53 Sect/Pc #: 4/PCE 3B
ROCK = PLAG-CPX PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED)
THE THIN SECTION WAS TAKEN PART WAY THROUGH
CONTACT BASALT AND PART WAY THROUGH THE
ASSOCIATED BASALT DIKE--THE CONTACT BASALT IS
PHYRIC AND THE BASALT DIKE IS ONLY MODERATELY
PHYRIC;
Texture: PORPHYRITIC,OPHITIC,INTERSERTAL
THE CONTACT BASALT IS PORPHYRITIC + OPHITIC AND
THE BASALT DIKE IS MODERATELY PORPHYRITIC +
INTERSERTAL;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 15%)
Size(mm): 3 Morphology: LATHS
DATA FROM THE CONTACT BASALT;
PLAGIOCLASE ( 5%)
Size(mm): 1 Morphology: LATHS
DATA FROM THE BASALT DIKE;
CLINOPYROXENE ( 3%)
Size(mm): 1 Morphology: ANHEDRAL
DATA FROM THE CONTACT BASALT;
CLINOPYROXENE ( 1%)
Size(mm): 0.6 Morphology: ANHEDRAL
DATA FROM THE BASALT DIKE*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.2 Morphology: ANHEDRAL
ALTERED,DATA FROM THE CONTACT BASALT;
OLIVINE ( 8%)
Size(mm): 0.1 Morphology: ANHEDRAL
ALTERED,DATA FROM THE BASALT DIKE;
PLAGIOCLASE ( 35%)
Size(mm): 0.6 Morphology: LATHS
DATA FROM THE CONTACT BASALT;
PLAGIOCLASE ( 35%)
Size(mm): 0.3 Morphology: LATHS
DATA FROM THE BASALT DIKE;
CLINOPYROXENE ( 30%)
Size(mm): 0.3 Morphology: SUBHEDRAL
DATA FROM THE CONTACT BASALT;
CLINOPYROXENE ( 40%)
Size(mm): 0.1 Morphology: SUBHEDRAL
DATA FROM THE BASALT DIKE;
MAGNETITE ( 5%)
Size(mm): 0.1 Morphology: ANHEDRAL
DATA FROM THE CONTACT BASALT;
MAGNETITE ( 6%)
Size(mm): 0.05 Morphology: ANHEDRAL
DATA FROM THE BASALT DIKE*
Alteration - CARBONATE
Location: VESICLES
DATA FROM THE CONTACT BASALT;
CARBONATE
Location: VESICLES
DATA FROM THE BASALT DIKE;
CLAY MIN
Location: VESICLES Replacing: OL
DATA FROM THE CONTACT BASALT;
CLAY MINERALS
Location: VESICLES Replacing: OL
DATA FROM THE BASALT DIKE*
Vesicles -
Size(mm): 2
Percent: 10
Shape: ROUND
DATA FROM THE CONTACT BASALT;
Size(mm): 1
Percent: 5
Shape: ROUND
DATA FROM THE BASALT DIKE*
Leg : 53 Top/Bottom Interval(mm): 920/ 941 Describer: Robinson, P.
Hole: 418A Top of Core Depth(m) : 743.10 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 748.53 Sect/Pc #: 4/PCE 3B
ROCK = PLAG-CPX-OL PHYRIC BASALT
ENCODED FROM "INITIAL CORE DESCRIPTION";
Texture: PORPHYRITIC,INTERSERTAL*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.5 Morphology: SUBHEDRAL
ID UNCERTAIN FOR OL;
PLAGIOCLASE ( 10%)
Size(mm): TO 4 Morphology: EUHEDRAL
CLINOPYROXENE ( 2%)
Size(mm): TO 1 Morphology: SUBOPHITIC
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.7 Morphology: SUBHEDRAL
CLINOPYROXENE ( 17%)
Size(mm): 0.4 Morphology: SUBOPHITIC
OPAQUE MINERALS ( 4%)
Size(mm): .03 Morphology: EUHEDRAL
GLASS ( 15%)
Alteration - CARBONATE
Replacing: OLIVINE
ID UNCERTAIN FOR OL;
SMECTITE
Replacing: OLIVINE
ID UNCERTAIN FOR OL*
Vesicles -
Size(mm): TO 0.5
Percent: 10
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1340/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 743.10 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 748.94 Sect/Pc #: 4/PCE 4B
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC-INTERSERTAL
GROUNDMASS IS MEDIUM-GRAINED;
Where sampled: BASALT DIKE*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.7 Morphology: SUBHEDRAL
ALTERED TO CALCITE;
PLAGIOCLASE ( 6%)
Size(mm): TO 2.5 Morphology: EUHEDRAL
FRESH,ZONED;
CLINOPYROXENE ( 1%)
Size(mm): <0.4 Morphology: ANHEDRAL
SUBOPHITIC CLOTS WITH PLAG*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): <0.25 Morphology: LATHS,SUBHEDRAL
CLINOPYROXENE ( 40%)
Size(mm): 0.1 Morphology: SUBOPHITIC-GRANULAR
FRESH;
OPAQUE MINERALS ( 8%)
Size(mm): 0.05 Morphology: EUHEDRAL
INCLUDES MAGN + ILMENITE;
GLASS ( 11%)
ALTERED OR DEVITRIFIED*
Alteration - CALCITE
Location: VESICLES Replacing: OL PHENOS
SMECTITE
Replacing: OL,GLASS
OL IN GROUNDMASS IS NOW ALTERED TO SMEC*
Vesicles -
Size(mm): <3
Percent: 3
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 680/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 743.10 Rock Type: IGNEOUS
Core: 70 Sample Midpoint(m) : 749.78 Sect/Pc #: 5/PCE 2E
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): <1 Morphology: EUHEDRAL
ALTERED TO SMECTITE + CALCITE;
PLAGIOCLASE ( 8%)
Size(mm): <4 Morphology: EUHEDRAL
CLINOPYROXENE ( 3%)
Size(mm): TO 0.8 Morphology: ROUNDED-ANHEDRAL
ROUNDED OR IN SUBOPHITIC CLOTS WITH PLAG*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): TO 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 33%)
Size(mm): 0.05 Morphology: GRANULAR
OPAQUE MINERALS ( 7%)
Size(mm): 0.03 Morphology: EUHEDRAL
INCLUDES MAGN + ILMENITE;
GLASS ( 5%)
Alteration - CALCITE
Location: VESICLES,
Location: VEINS
THIN VEINS FILLED WITH CALCITE;
SMECTITE
Location: VEINS Replacing: OL,GLASS
THIN VEINS FILLED WITH CALCITE AND/OR SMEC*
Vesicles -
Size(mm): 0.1
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1160/1180 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 752.70 Rock Type: IGNEOUS
Core: 71 Sample Midpoint(m) : 755.37 Sect/Pc #: 2/PCE 4C
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): 1-3 Morphology: LATHS,EUHEDRAL
CLINOPYROXENE ( 3%)
Size(mm): 0.5-1.5 Morphology: SUBHEDRAL
Groundmass - OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 30%)
Size(mm): TO 0.5 Morphology: ACICULAR
CLINOPYROXENE ( 46%)
Size(mm): 0.3 Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): 0.01 Morphology: GRANULAR
Alteration - CARBONATE
Location: VESICLES Replacing: OL
CLAY MINERALS
Location: VESICLES Replacing: OL
Vesicles -
Size(mm): 0.2
Percent: 1
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1200/1220 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 758.80 Rock Type: IGNEOUS
Core: 72 Sample Midpoint(m) : 760.01 Sect/Pc #: 1/PCE 5A
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 1-2 Morphology: EUHEDRAL
PLAGIOCLASE ( 8%)
Size(mm): 1-3 Morphology: LATHS,EUHEDRAL
CLINOPYROXENE ( 3%)
Size(mm): 0.5-2 Morphology: ANHEDRAL
Groundmass - OLIVINE ( 3%)
Size(mm): 0.07 Morphology: ANHEDRAL
PLAGIOCLASE ( 25%)
Size(mm): 0.5 Morphology: MICROLITES,ACICULAR
CLINOPYROXENE ( 43%)
Size(mm): 0.3 Morphology: RADIATING SHEAVES
MAGNETITE ( 5%)
Size(mm): 0.01 Morphology: GRANULAR
GLASS ( 8%)
Alteration - CALCITE
Location: VESICLES Replacing: OL
SMECTITE
Replacing: OL
SILICA
Replacing: OL
Vesicles -
Size(mm): 0.2-0.3
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 980/1020 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 758.80 Rock Type: IGNEOUS
Core: 72 Sample Midpoint(m) : 764.30 Sect/Pc #: 4/PCE 3A
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,GLASSY,VARIOLITIC;
Where sampled: GLASSY MARGIN,NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.5-2 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): 0.5-4 Morphology: LATHS,EUHEDRAL
CLINOPYROXENE ( 4%)
Size(mm): 0.5-2 Morphology: SUBHEDRAL
Groundmass - GLASS ( 83%)
PARTLY DEVITRIFIED*
Alteration - CARBONATE
Location: VEINS, Replacing: OL,OL PHENOS
Location: VESICLES
CLAY MINERALS
Location: VEINS Replacing: OL,OL PHENOS
Vesicles -
Size(mm): 0.2
Percent: 2
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 430/ 440 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 764.80 Rock Type: IGNEOUS
Core: 73 Sample Midpoint(m) : 765.24 Sect/Pc #: 1/PCE 2C
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 4%)
Size(mm): 1-3.5 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): 1-4 Morphology: LATHS,EUHEDRAL
CLINOPYROXENE ( 3%)
Size(mm): 1-1.5 Morphology: SUBHEDRAL
Groundmass - OLIVINE ( 3%)
Size(mm): 0.2 Morphology: SUBHEDRAL
ALTERED;
PLAGIOCLASE ( 30%)
Size(mm): 0.1-0.3 Morphology: MICROLITES,ACICULAR
CLINOPYROXENE ( 44%)
Size(mm): 0.2 Morphology: ANHEDRAL
MAGNETITE ( 5%)
Size(mm): 0.005 Morphology: GRANULAR
Alteration - CARBONATE
Location: VESICLES Replacing: OL
CLAY MINERALS
Location: VESICLES Replacing: OL
Vesicles -
Size(mm): 0.2-0.3
Percent: 1
Filling: CALCITE,SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 1110/ 0 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 764.80 Rock Type: SEDIMENTARY
Core: 73 Sample Midpoint(m) : 770.41 Sect/Pc #: 4/PCE 2A
ROCK = VEIN OR ALTERED SEDIMENT;
Alteration - CALCITE
Location: VEIN
LARGE GRAINS OF CALCITE ARE RIMMED WITH FINE
CHALCEDONY AND BROWN SMECTITE MATERIAL,STRUCTURE
MAY BE RELIC OF ALTERED CARBONATE-SHALE SEDIMENT;
CHALCEDONY
Location: VEIN
SMECTITE
Location: VEIN
BRIGHT BROWN*
Leg : 53 Top/Bottom Interval(mm): 1460/1480 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 764.80 Rock Type: IGNEOUS
Core: 73 Sample Midpoint(m) : 770.77 Sect/Pc #: 4/PCE 2D
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 5%)
Size(mm): 0.5-1.5 Morphology: EUHEDRAL
PLAGIOCLASE ( 10%)
Size(mm): 0.5-3 Morphology: LATHS,EUHEDRAL
CLINOPYROXENE ( 4%)
Size(mm): TO 2 Morphology: ANHEDRAL
Groundmass - OLIVINE ( 3%)
Size(mm): 0.2 Morphology: SUBHEDRAL
PLAGIOCLASE ( 35%)
Size(mm): 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 35%)
Size(mm): 0.2 Morphology: RADIATING SHEAVES
MAGNETITE ( 2%)
Size(mm): 0.01 Morphology: EUHEDRAL
GLASS ( 5%)
Alteration - CARBONATE
Location: VESICLES
SMECTITE
Replacing: OL,GLASS
Vesicles -
Size(mm): 0.5
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 960/ 0 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 764.80 Rock Type: UNIDENTIFIED
Core: 73 Sample Midpoint(m) : 773.26 Sect/Pc #: 6/PCE 3D
ROCK = BASALTIC BRECCIA
SHIPBOARD DESCRIPTION (UNEDITED),
FRAGMENTS OF GLASS ARE COMPLETELY ALTERED TO
SMECTITE,FRAGMENTS OF BASALT ARE PARTLY ALTERED,
CEMENT: COARSE-GRAINED CALCITE AND FINE
CHALCEDONY WITH SOME SMECTITE;
Alteration - SMECTITE
Replacing: GLASS
THIS ROCK TYPE IS BRECCIA. FRAGMENTS OF GLASS ARE
COMPLETELY ALTERED TO SMECTITE. FRAGMENTS OF
BASALT ARE PARTLY ALTERED. THE CEMENT CONSISTS
OF COARSE-GRAINED CALCITE AND FINE CHALCEDONY
WITH SOME SMECTITE;
CALCITE
THIS ROCK TYPE IS BRECCIA. FRAGMENTS OF BASALT
ARE PARTLY ALTERED. THE CEMENT CONSISTS OF
COARSE-GRAINED CALCITE AND FINE CHALCEDONY WITH
SOME SMECTITE;
CHALCEDONY
THIS ROCK TYPE IS BRECCIA. FRAGMENTS OF BASALT
ARE PARTLY ALTERED. THE CEMENT CONSISTS OF
COARSE-GRAINED CALCITE AND FINE CHALCEDONY WITH
SOME SMECTITE*
Leg : 53 Top/Bottom Interval(mm): 360/ 0 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 774.30 Rock Type: IGNEOUS
Core: 74 Sample Midpoint(m) : 776.16 Sect/Pc #: 2/PCE 1B
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): 3-4 Morphology: EUHEDRAL
Groundmass - OLIVINE ( 5%)
Size(mm): 0.1-0.3 Morphology: EUHEDRAL,ANHEDRAL
PLAGIOCLASE ( 40%)
Size(mm): 0.1-0.5 Morphology: EUHEDRAL
CLINOPYROXENE ( 37%)
Size(mm): 0.1-0.3 Morphology: SUBOPHITIC
OPAQUE MINERALS ( 5%)
Size(mm): 0.1 Morphology: SUBHEDRAL
Alteration - CALCITE
Location: VESICLES
SMECTITE ( 5%)
Location: VESICLES Replacing: OL
SMECTITE IN VESICLES*
Vesicles -
Size(mm): 2
Percent: 3
Filling: CALCITE,SMEC
Shape: ROUND,
Shape: IRREGULAR
Leg : 53 Top/Bottom Interval(mm): 910/ 0 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 774.30 Rock Type: IGNEOUS
Core: 74 Sample Midpoint(m) : 781.21 Sect/Pc #: 5/PCE 6A
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: NEXT TO GLASSY MARGIN,PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.4-0.7 Morphology: EUHEDRAL
PLAGIOCLASE ( 12%)
Size(mm): 0.5-5 Morphology: EUHEDRAL
CLINOPYROXENE ( 2%)
Size(mm): TO 3 Morphology: ANHEDRAL
Groundmass - PLAGIOCLASE ( 4%)
Size(mm): TO 0.5 Morphology: MICROLITES,LATHS
CLINOPYROXENE ( 73%)
Morphology: RADIATING SHEAVES
VARIOLITIC,POORLY CRYSTALLIZED;
OPAQUE MINERALS ( 2%)
Size(mm): 0.005 Morphology: GRANULAR
Alteration - CARBONATE ( 1%)
Location: VESICLES Replacing: OL
SMECTITE
Replacing: OL
QUARTZ
Replacing: OL
ID UNCERTAIN FOR QUARTZ*
Vesicles -
Size(mm): 0.2-0.6
Percent: 2
Filling: CALCITE
Shape: ROUND-
Shape: IRREGULAR
Leg : 53 Top/Bottom Interval(mm): 870/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 774.30 Rock Type: IGNEOUS
Core: 74 Sample Midpoint(m) : 782.67 Sect/Pc #: 6/PCE 2E
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,VITROPHYRIC-MICROLITIC;
Where sampled: GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 0.8 Morphology: EUHEDRAL
PLAGIOCLASE ( 15%)
Size(mm): TO 3.5 Morphology: EUHEDRAL
SOMETIMES ZONED;
CLINOPYROXENE ( 5%)
Size(mm): 3-5 Morphology: EUHEDRAL
Groundmass - GLASS ( 75%)
SOME SHEAF-LIKE MICROLITES,
PARTIALLY DEVITRIFIED*
Alteration - SMECTITE
Replacing: OL
CLAY.MINS ARE ALONG VEINS*
Vesicles -
Size(mm): 0.2
Percent: 2
Shape: ROUND
VESICLES ARE EMPTY*
Leg : 53 Top/Bottom Interval(mm): 1200/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 781.70 Rock Type: IGNEOUS
Core: 75 Sample Midpoint(m) : 782.90 Sect/Pc #: 1/PCE 4B
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 1.0 Morphology: EUHEDRAL-SUBHEDRAL
REPLACED BY SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): <2.8 Morphology: EUHEDRAL
FORMS SUBOPHITIC GLOMEROCRYSTS WITH CPX;
CLINOPYROXENE ( 6%)
Size(mm): TO 4 Morphology: EUHEDRAL-SUBHEDRAL
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): <0.5 Morphology: EUHEDRAL,ACICULAR
CLINOPYROXENE ( 58%)
Morphology: SUBHEDRAL,RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): .01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: GROUNDMASS, Replacing: OL
Location: VESICLES
SMECTITE
Location: GROUNDMASS Replacing: OL PHENOS
OL PHENOS ALTERED TO SMEC*
Vesicles -
Size(mm): 0.7
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 180/ 0 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 781.70 Rock Type: IGNEOUS
Core: 75 Sample Midpoint(m) : 786.38 Sect/Pc #: 4/PCE 1B
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: NEXT TO GLASSY MARGIN,PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): 0.5-1 Morphology: EUHEDRAL
ALTERED TO CALCITE;
PLAGIOCLASE ( 10%)
Size(mm): 1-5 Morphology: EUHEDRAL
CLINOPYROXENE ( 4%)
Size(mm): TO 1.5 Morphology: ANHEDRAL-ROUNDED
Groundmass - OLIVINE ( 2%)
Size(mm): 0.15 Morphology: SUBHEDRAL
PLAGIOCLASE ( 25%)
Size(mm): 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 54%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 2%)
Size(mm): 0.005 Morphology: GRANULAR
Alteration - CARBONATE
Location: VESICLES Replacing: OL,OL PHENOS
SMECTITE
Replacing: OL,OL PHENOS
Vesicles -
Size(mm): 0.5
Percent: 1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 210/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 787.10 Rock Type: IGNEOUS
Core: 76 Sample Midpoint(m) : 787.31 Sect/Pc #: 1/PCE 2D
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,QUENCH;
Where sampled: NEXT TO FLOW MARGIN*
Phenocrysts- OLIVINE ( 2%)
Size(mm): TO 1.0 Morphology: EUHEDRAL
PLAGIOCLASE ( 8%)
Size(mm): <3 Morphology: EUHEDRAL
FRESH;
CLINOPYROXENE ( 5%)
Size(mm): <3.0 Morphology: ROUNDED-ANHEDRAL
FRESH*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.05 Morphology: SUBHEDRAL
ROUNDED SMECTITE CLOTS;
PLAGIOCLASE ( 15%)
Size(mm): 0.3 Morphology: SUBHEDRAL
VERY FINE-GRAINED GROUNDMASS WITH SHEAF-LIKE
INTERGROWTHS OF PLAG + CPX;
CLINOPYROXENE ( 35%)
Morphology: RADIATING SHEAVES
VERY FINE-GRAINED GROUNDMASS WITH SHEAF-LIKE
INTERGROWTHS OF PLAG + CPX;
OPAQUE MINERALS ( 6%)
Size(mm): 0.005 Morphology: GRANULAR
GLASS ( 26%)
Alteration - CARBONATE
Replacing: OL PHENOS
SMECTITE
Location: GROUNDMASS, Replacing: OL
Location: VESICLES
Vesicles -
Size(mm): 0.2
Percent: 1
Filling: SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 340/ 360 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 793.10 Rock Type: IGNEOUS
Core: 77 Sample Midpoint(m) : 794.95 Sect/Pc #: 2/PCE 3
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,CRYSTALLINE,QUENCH
THE THIN SECTION WAS TAKEN NEXT TO A GLASSY
MARGIN AND INCORPORATES TWO DISTINCT TYPES OF
ROCK--EITHER CRYSTALLINE OR QUENCH--AND DATA
FOLLOWS FOR EACH ROCK TYPE;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 0.5 Morphology: EUHEDRAL
DATA FROM CRYSTALLINE ROCK TYPE,ALTERED;
OLIVINE ( 4%)
Size(mm): 0.5-5 Morphology: EUHEDRAL
DATA FROM QUENCH ROCK TYPE,ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): TO 1 Morphology: EUHEDRAL
DATA FROM CRYSTALLINE ROCK TYPE;
PLAGIOCLASE ( 7%)
Size(mm): 0.7
DATA FROM QUENCH ROCK TYPE;
CLINOPYROXENE ( 7%)
Size(mm): 0.5 Morphology: SUBHEDRAL
DATA FROM CRYSTALLINE ROCK TYPE;
CLINOPYROXENE ( 3%)
Size(mm): 0.5
DATA FROM QUENCH ROCK TYPE*
Groundmass - OLIVINE ( 10%)
Size(mm): 0.1 Morphology: SUBHEDRAL
DATA FROM CRYSTALLINE ROCK TYPE;
PLAGIOCLASE ( 25%)
Size(mm): 0.1-0.4 Morphology: ACICULAR
DATA FROM CRYSTALLINE ROCK TYPE;
PLAGIOCLASE ( 10%)
Size(mm): 0.05 Morphology: EUHEDRAL
DATA FROM QUENCH ROCK TYPE;
CLINOPYROXENE ( 36%)
Size(mm): 0.1 Morphology: RADIATING SHEAVES
DATA FROM CRYSTALLINE ROCK TYPE;
CLINOPYROXENE ( 10%)
Size(mm): 0.05 Morphology: ANHEDRAL
DATA FROM QUENCH ROCK TYPE;
OPAQUE MINERALS ( 8%)
Size(mm): 0.5 Morphology: GRANULAR
DATA FROM CRYSTALLINE ROCK TYPE;
OPAQUE MINERALS ( 10%)
Size(mm): 0.05 Morphology: SUBHEDRAL
DATA FROM QUENCH ROCK TYPE;
GLASS ( 55%)
DATA FROM QUENCH ROCK TYPE,ALTERED*
Alteration - CARBONATE
Replacing: OL
DATA FROM CRYSTALLINE ROCK TYPE;
CARBONATE
Replacing: GLASS
DATA FROM QUENCH ROCK TYPE;
SMECTITE
Replacing: OL
DATA FROM CRYSTALLINE ROCK TYPE;
SMECTITE
Replacing: GLASS
DATA FROM QUENCH ROCK TYPE*
Vesicles -
Size(mm): 0.5
Percent: 1
Filling: CALCITE
Shape: ROUND
DATA FROM QUENCH ROCK TYPE*
Leg : 53 Top/Bottom Interval(mm): 470/ 490 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 812.00 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 813.98 Sect/Pc #: 2/PCE 3C
ROCK = APHYRIC BASALT;
Texture: COARSE-GRAINED,OPHITIC,APHYRIC,SUBOPHITIC;
Where sampled: PILLOW INTERIOR*
Groundmass - MICROCRYST GROUNDMASS ( 10%)
INTERSTITIAL MATERIAL,ALTERED TO SMEC;
PLAGIOCLASE ( 50%)
Size(mm): 0.5-5 Morphology: EUHEDRAL
CLINOPYROXENE ( 35%)
Morphology: ANHEDRAL
OPAQUE MINERALS ( 5%)
Size(mm): 0.2-0.5 Morphology: EUHEDRAL,SUBHEDRAL
Alteration - SMECTITE
Replacing: INTERSTITIAL MATERIAL
Vesicles -
Size(mm): 1
Percent: <1
Filling: CALCITE
Leg : 53 Top/Bottom Interval(mm): 790/ 800 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 812.00 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 814.30 Sect/Pc #: 2/PCE 4A
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED),
THE THIN SECTION WAS TAKEN PART WAY THROUGH
CONTACT BASALT AND PART WAY THROUGH THE
ASSOCIATED BASALT DIKE;
Texture: COARSE-GRAINED,OPHITIC,QUENCHED,GLASSY
THE CONTACT BASALT IS COARSE-GRAINED + OPHITIC,
THE BASALT DIKE IS QUENCHED + GLASSY*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 1 Morphology: EUHEDRAL
DATA FROM THE BASALT DIKE,ALTERED TO CALCITE +
SMECTITE;
PLAGIOCLASE ( 5%)
Size(mm): 5
DATA FROM THE CONTACT BASALT;
PLAGIOCLASE ( 5%)
Size(mm): 0.5
DATA FROM THE BASALT DIKE;
CLINOPYROXENE ( 2%)
Size(mm): 0.3
DATA FROM THE BASALT DIKE*
Groundmass - OLIVINE ( 5%)
Morphology: ANHEDRAL
DATA FROM THE CONTACT BASALT,ALTERED;
PLAGIOCLASE ( 50%)
Size(mm): 0.5-3 Morphology: EUHEDRAL
DATA FROM THE CONTACT BASALT;
PLAGIOCLASE ( 2%)
Size(mm): 0.02 Morphology: EUHEDRAL
DATA FROM THE BASALT DIKE;
CLINOPYROXENE ( 35%)
Size(mm): 0.5-3 Morphology: ANHEDRAL
DATA FROM THE CONTACT BASALT;
MAGNETITE ( 5%)
Size(mm): 0.3 Morphology: EUHEDRAL
DATA FROM THE CONTACT BASALT;
GLASS ( 96%)
DATA FROM THE BASALT DIKE*
Alteration - CLAY MINERALS ( 5%)
Location: GROUNDMASS Replacing: OL
DATA FROM THE CONTACT BASALT;
SMECTITE
Replacing: OL PHENOS
DATA FROM THE BASALT DIKE;
CALCITE
Replacing: OL PHENOS
DATA FROM THE BASALT DIKE;
Leg : 53 Top/Bottom Interval(mm): 680/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 812.00 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 818.68 Sect/Pc #: 5/PCE 1G
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,SUBOPHITIC-INTERSERTAL;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO 1 Morphology: EUHEDRAL
REPLACED BY SMEC;
PLAGIOCLASE ( 8%)
Size(mm): <3.2 Morphology: EUHEDRAL-SUBHEDRAL
APPROX COMP AN70,WEATHERED,SLIGHTLY ZONED;
CLINOPYROXENE ( 1%)
Size(mm): TO 1.5 Morphology: ROUNDED
HOMOGENEOUS*
Groundmass - OLIVINE ( 8%)
Size(mm): 0.2 Morphology: EUHEDRAL-SUBHEDRAL
REPLACED BY SMEC + CALCITE;
PLAGIOCLASE ( 50%)
Size(mm): 0.05-1 Morphology: EUHEDRAL-SUBHEDRAL
LESS WEATHERED THAN PHENOS;
CLINOPYROXENE ( 24%)
Size(mm): TO 0.5 Morphology: SUBOPHITIC
GLASS ( 5%)
INTERSTITIAL,VERY FINE-GRAINED*
Alteration - CALCITE
Location: VESICLES
SMECTITE
Replacing: OL,OL PHENOS
Vesicles -
Size(mm): 1
Percent: 1
Filling: CALCITE
Shape: ROUND-
Shape: IRREGULAR
Leg : 53 Top/Bottom Interval(mm): 1020/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 812.00 Rock Type: IGNEOUS
Core: 79 Sample Midpoint(m) : 822.02 Sect/Pc #: 7/PCE 2C
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS MICROCRYSTALLINE WITH SOME PARTS
SHEAF-LIKE MICROLITES;
Where sampled: BASE OF FLOW*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.6 Morphology: EUHEDRAL
ALTERED TO CALCITE;
PLAGIOCLASE ( 12%)
Size(mm): <3.6 Morphology: EUHEDRAL
CLINOPYROXENE ( 1%)
Size(mm): 1.0 Morphology: ANHEDRAL
FORMING SUBOPHITIC-OPHITIC GLOMEROCRYSTS*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): TO 1.0 Morphology: ACICULAR
CLINOPYROXENE ( 70%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 6%)
Size(mm): 0.02 Morphology: EUHEDRAL
Alteration - CARBONATE ( 5%)
Location: GROUNDMASS Replacing: OL PHENOS
OL PHENOS ALTERED TO CALCITE;
SMECTITE ( 10%)
Location: GROUNDMASS Replacing: OL
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 360/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 821.50 Rock Type: IGNEOUS
Core: 80 Sample Midpoint(m) : 824.86 Sect/Pc #: 3/PCE 1C
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,INTERGRANULAR-
INTERSERTAL;
Where sampled: BASALT DIKE*
Phenocrysts- OLIVINE ( 2%)
Size(mm): TO 1.5 Morphology: EUHEDRAL
PLAGIOCLASE ( 8%)
Size(mm): <2 Morphology: EUHEDRAL
Groundmass - OLIVINE ( 3%)
Size(mm): 0.05 Morphology: SUBHEDRAL
SMALL GRAINS OF SMECTITE IN THE GROUNDMASS ARE
PROBABLY ALTERED OLIVINES;
PLAGIOCLASE ( 42%)
Size(mm): 0.25 Morphology: LATHS
FRESH;
CLINOPYROXENE ( 40%)
Size(mm): 0.1 Morphology: GRANULAR-ACICULAR
FRESH;
MAGNETITE ( 5%)
Size(mm): TO 0.1 Morphology: LATHS,GRANULES
Alteration - SMECTITE ( 5%)
Location: GROUNDMASS Replacing: OL
CARBONATE
Replacing: OL
Vesicles -
Size(mm): 0.2
Percent: <1
Shape: IRREGULAR
Leg : 53 Top/Bottom Interval(mm): 270/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 821.50 Rock Type: IGNEOUS
Core: 80 Sample Midpoint(m) : 827.77 Sect/Pc #: 5/PCE 1B
ROCK = PLAG-OL PHYRIC BASALT;
Texture: PORPHYRITIC,INTERGRANULAR;
Where sampled: BASALT DIKE*
Phenocrysts- OLIVINE ( 1%)
Size(mm): 0.7 Morphology: EUHEDRAL
CORRODED,ALTERED TO SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): TO 3 Morphology: EUHEDRAL
FRESH,ZONED*
Groundmass - OLIVINE ( 3%)
Size(mm): 0.05 Morphology: SUBHEDRAL
ROUNDED GRAINS OF SMECTITE ARE PROBABLY ALTERED
OLIVINE;
PLAGIOCLASE ( 40%)
Size(mm): <0.3 Morphology: ACICULAR,LATHS
CLINOPYROXENE ( 38%)
Size(mm): 0.1 Morphology: GRANULAR
OPAQUE MINERALS ( 4%)
Size(mm): 0.01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE;
GLASS ( 2%)
INTERSTITIAL,ALTERED TO SMECTITE*
Alteration - SMECTITE
Replacing: OL,OL PHENOS
Vesicles -
Size(mm): 0.2
Percent: <1
Filling: CARB
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 200/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 831.00 Rock Type: IGNEOUS
Core: 81 Sample Midpoint(m) : 832.70 Sect/Pc #: 2/PCE 1B
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,SUBOPHITIC-INTERSERTAL*
Phenocrysts- OLIVINE ( 2%)
Size(mm): TO 1 Morphology: SUBHEDRAL,EUHEDRAL
EUHEDRAL IF INCLOSED IN CPX,REPLACED BY SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): <4.0 Morphology: EUHEDRAL
FAIRLY HOMOGENEOUS WITH ZONED RIMS;
CLINOPYROXENE ( 5%)
Size(mm): <1.5 Morphology: SUBOPHITIC
FORMS SUBOPHITIC-OPHITIC GLOMEROCRYSTS*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): <0.6 Morphology: LATHS
FRESH;
CLINOPYROXENE ( 30%)
Size(mm): 0.2 Morphology: GRANULAR-SUBOPHITIC
OPAQUE MINERALS ( 5%)
Size(mm): 0.05 Morphology: EUHEDRAL
INCLUDES MAGN + ILMENITE;
GLASS ( 5%)
INTERSTITIAL,DEVITRIFIED;
OLIVINE ( 3%)
Size(mm): 0.3 Morphology: SUBHEDRAL
Alteration - SMECTITE
Replacing: OL PHENOS
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 1340/ 0 Describer: Staudigel, H.
Hole: 418A Top of Core Depth(m) : 831.00 Rock Type: IGNEOUS
Core: 81 Sample Midpoint(m) : 838.34 Sect/Pc #: 5/PCE 5
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH*
Phenocrysts- OLIVINE ( 1%)
Size(mm): <1 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 12%)
Size(mm): <4 Morphology: EUHEDRAL
OFTEN IN GLOMEROCRYSTS WITH CPX;
CLINOPYROXENE ( 2%)
Size(mm): 0.5 Morphology: ANHEDRAL
ONLY IN GLOMEROCRYSTS WITH PLAG*
Groundmass - PLAGIOCLASE ( 10%)
Size(mm): TO 0.6 Morphology: SKELETAL
CLINOPYROXENE ( 68%)
Size(mm): <0.01 Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): 0.02 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE;
OLIVINE ( 2%)
Size(mm): 0.3 Morphology: EUHEDRAL
Alteration - SMECTITE ( 2%)
Location: GROUNDMASS Replacing: OL
CARBONATE
Replacing: OL
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 1330/1370 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 837.50 Rock Type: IGNEOUS
Core: 82 Sample Midpoint(m) : 838.85 Sect/Pc #: 1/PCE 6B
ROCK = PLAG SPARSELY PHYRIC BASALT;
Texture: OPHIMOTTLED-INTERSERTAL;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 1%)
Size(mm): TO 2.5 Morphology: SUBHEDRAL
Groundmass - OLIVINE ( 3%)
Size(mm): 0.3-0.5 Morphology: EUHEDRAL
PLAGIOCLASE ( 50%)
Size(mm): 1 Morphology: SUBHEDRAL
CLINOPYROXENE ( 31%)
Size(mm): 0.2 Morphology: GRANULAR-SUBOPHITIC
MAGNETITE ( 5%)
Size(mm): 0.05 Morphology: EUHEDRAL
GLASS ( 10%)
INTERSTITIAL PATCHES DEVITRIFIED*
Alteration - SMECTITE
Replacing: OL
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 1310/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 837.50 Rock Type: IGNEOUS
Core: 82 Sample Midpoint(m) : 840.31 Sect/Pc #: 2/PCE 1K
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 3%)
Size(mm): 1 Morphology: EUHEDRAL
REPLACED BY SMECTITE;
PLAGIOCLASE ( 8%)
Size(mm): TO 1.5 Morphology: EUHEDRAL LATHS
FRESH,ZONED;
CLINOPYROXENE ( 4-5%)
Morphology: SUBOPHITIC CLOTS
FRESH*
Groundmass - PLAGIOCLASE ( 30%)
Size(mm): 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 48%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): 0.05 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE;
OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
Alteration - SMECTITE ( 5%)
Location: VESICLES Replacing: OL PHENOS
Vesicles -
Size(mm): 0.2
Percent: TR
Filling: SMEC
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 710/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 840.50 Rock Type: IGNEOUS
Core: 83 Sample Midpoint(m) : 841.21 Sect/Pc #: 1/PCE 1G
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL-INTERGRANULAR;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 2%)
Size(mm): <1 Morphology: EUHEDRAL
ALTERED TO CALCITE + SMECTITE;
PLAGIOCLASE ( 6-8%)
Size(mm): <3 Morphology: EUHEDRAL
FRESH;
CLINOPYROXENE ( 3%)
Size(mm): <1.5 Morphology: SUBOPHITIC
FRESH*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.6 Morphology: SUBHEDRAL
COARSE GRAINED;
CLINOPYROXENE ( 34%)
Size(mm): 0.25 Morphology: GRANULAR
MAGNETITE ( 5%)
Size(mm): 0.1 Morphology: EUHEDRAL
GLASS ( 5%)
INTERSTITIAL,DEVITRIFIED;
OLIVINE ( 3%)
Size(mm): 0.3 Morphology: SUBHEDRAL
Alteration - CARBONATE
Replacing: OL PHENOS
OL PHENOS ALTERED TO CALCITE + SMEC;
SMECTITE
Location: GROUNDMASS Replacing: OL PHENOS
OL PHENOS AND FINE-GRAINED INTERSTITIAL*
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 80/ 110 Describer: Pertsev, N.
Hole: 418A Top of Core Depth(m) : 840.50 Rock Type: IGNEOUS
Core: 83 Sample Midpoint(m) : 845.10 Sect/Pc #: 4/PCE 1A
ROCK = ALTERED BASALT
SHIPBOARD DESCRIPTION (UNEDITED),
A "SPOT" OF BADLY ALTERED BASALT;
Phenocrysts- CLINOPYROXENE
RELICS;
PLAGIOCLASE ( TR%)
RELICS*
Groundmass - PLAGIOCLASE
ALTERED TO MORDENITE AND THEN SCOLECITE*
Alteration - ZEOLITE
SMECTITE
CALCITE
MORDENITE
Replacing: PLAG
SCOLECITE
Replacing: MORDENITE
R.I. 1.518,BIREFRINGENCE 0.012,POLYSYNTHETIC
TWINS,IN RADIAL AGGREGATES IN CALCITE TOO;
PHILLIPSITE
R.I. 1.488,BIREFRINGENCE 0.010,GOOD CLEAVAGE,
PARALLEL EXTINCTION*
Leg : 53 Top/Bottom Interval(mm): 1430/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 850.00 Rock Type: IGNEOUS
Core: 85 Sample Midpoint(m) : 851.43 Sect/Pc #: 1/PCE 6
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,SUBOPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- OLIVINE ( 4%)
Size(mm): TO 2.5 Morphology: SUBHEDRAL
APPROX COMP FO70,MOSTLY FRESH WITH SMECTITE
FILLED FRACTURES--MAGN + OTHER ALTERATION
MINERALS AROUND THE PERIMETER;
PLAGIOCLASE ( 25%)
Size(mm): TO 4.0 Morphology: SUBHEDRAL
CLINOPYROXENE ( 20%)
Size(mm): TO 4.0 Morphology: ANHEDRAL-SUBOPHITIC
OIKOCRYSTS ENCLOSING PLAG,LARGE SUBHEDRAL PLATES
AND SMALLER (<1 MM) GRAINS,WEAKLY ZONED*
Groundmass - OLIVINE ( 2%)
Size(mm): TO 0.4 Morphology: SUBHEDRAL
PLAGIOCLASE ( 20%)
Size(mm): TO 0.7 Morphology: SUBHEDRAL
CLINOPYROXENE ( 22%)
Size(mm): 0.2 Morphology: GRANULAR
OPAQUE MINERALS ( 7%)
Size(mm): 0.25 Morphology: SUBHEDRAL
INCLUDES MAGN+ILMENITE,MAGN IS OFTEN FOUND AROUND
THE PERIMETER OF OL PHENOS*
Alteration - SMECTITE
Location: GROUNDMASS Replacing: OL,OL PHENOS
ONLY MINOR AMOUNTS,THERE IS ALSO A PALE
GREEN-BLUE PLEOCHROIC MINERAL AT OL RIMS. IT ONLY
OCCURS IN TRACE AMOUNTS AND IS EXTREMELY
FINE-GRAINED BUT IS NOT YET IDENTIFIED*
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 780/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 850.00 Rock Type: IGNEOUS
Core: 85 Sample Midpoint(m) : 858.28 Sect/Pc #: 6/PCE 1F
ROCK = PLAG-OL MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,OPHITIC;
Where sampled: FLOW INTERIOR*
Phenocrysts- PLAGIOCLASE ( 5%)
Size(mm): TO 8
OLIVINE ( 3-5%)
Size(mm): TO 3
Groundmass - OLIVINE ( 5%)
Size(mm): 1.5 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 40%)
Size(mm): TO 2 Morphology: EUHEDRAL LATHS
FRESH,ZONED;
CLINOPYROXENE ( 40%)
Size(mm): <2 Morphology: OPHITIC
FRESH,WEAKLY ZONED;
OPAQUE MINERALS ( 5%)
Size(mm): 0.15 Morphology: EUHEDRAL
INCLUDES MAGN + ILMENITE;
MICROCRYST GROUNDMASS ( 10%)
FINE-GRAINED INTERSTITIAL MATERIAL,PARTLY ALTERED
TO SMECTITE*
Alteration - CALCITE
Location: VEIN
THIN VEIN FILLED WITH CALCITE;
SMECTITE
Location: GROUNDMASS Replacing: OL
OL AND FINE-GRAINED INTERSTITIAL GROUNDMASS
MATERIAL PARTLY ALTERED TO SMEC*
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 150/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 859.50 Rock Type: IGNEOUS
Core: 86 Sample Midpoint(m) : 859.65 Sect/Pc #: 1/PCE 1B
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,INTERSERTAL;
Where sampled: FLOW MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): TO .8 Morphology: EUHEDRAL
REPLACED BY SMECTITE;
PLAGIOCLASE ( 10%)
Size(mm): TO 3.5 Morphology: EUHEDRAL
FRESH;
CLINOPYROXENE ( 5%)
Size(mm): TO 1.5 Morphology: SUBOPHITIC
GLOMEROCRYSTS,FRESH*
Groundmass - OLIVINE ( 2%)
Size(mm): 0.2 Morphology: SUBHEDRAL
ALTERED IF PRESENT;
PLAGIOCLASE ( 35%)
Size(mm): <0.3 Morphology: LATHS,SUBHEDRAL
CLINOPYROXENE ( 34%)
Size(mm): 0.1 Morphology: GRANULAR
OPAQUE MINERALS ( 3%)
Size(mm): 0.1 Morphology: EUHEDRAL
INCLUDES MAGN + ILMENITE;
GLASS ( 8%)
INTERSTITIAL,DEVITRIFIED*
Alteration - SMECTITE ( 3%)
Replacing: OL PHENOS,OL
OL IN GROUNDMASS IS ALTERED IF PRESENT*
Vesicles -
Percent: 0
Leg : 53 Top/Bottom Interval(mm): 750/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 859.50 Rock Type: IGNEOUS
Core: 86 Sample Midpoint(m) : 860.25 Sect/Pc #: 1/PCE 4B
ROCK = PLAG-CPX-OL PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: PORPHYRITIC,GLASSY-VARIOLITIC
GROUNDMASS IS VARIOLITIC;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( <1%)
Size(mm): <0.5 Morphology: EUHEDRAL
REPLACED BY CALCITE;
PLAGIOCLASE ( 10%)
Size(mm): <6 Morphology: EUHEDRAL
SLIGHTLY ALTERED TO CLAY MINERALS;
CLINOPYROXENE ( 3%)
Size(mm): <1 Morphology: SUBOPHITIC CLOTS
Groundmass - SULFIDE ( <1%)
IDENTITY UNCERTAIN FOR SULFIDE*
Alteration - CALCITE ( 1%)
Replacing: OL PHENOS
CLAY MINERALS ( 1%)
Replacing: PLAG
Leg : 53 Top/Bottom Interval(mm): 250/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 859.50 Rock Type: IGNEOUS
Core: 86 Sample Midpoint(m) : 864.25 Sect/Pc #: 4/PCE 1B
ROCK = PLAG-CPX-OL PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS VERY FINE-GRAINED;
Where sampled: NEXT TO GLASSY MARGIN*
Phenocrysts- OLIVINE ( 3%)
Size(mm): <1.5 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 12%)
Size(mm): <4 Morphology: EUHEDRAL LATHS
NUMEROUS GLASS INCLUSIONS PRESENT;
CLINOPYROXENE ( 1%)
Size(mm): TO 3 Morphology: ROUNDED
TWO BIG SUBHEDRAL CRYSTALS*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.3 Morphology: SKELETAL
CLINOPYROXENE ( 65%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 2%)
Size(mm): 0.005 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CALCITE ( 2%)
Location: VEINS
FOUND IN THIN VEINS;
SMECTITE
Replacing: OL PHENOS
Vesicles -
Size(mm): 0.2
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 610/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 859.50 Rock Type: IGNEOUS
Core: 86 Sample Midpoint(m) : 864.61 Sect/Pc #: 4/PCE 2B
ROCK = PLAG-OL-CPX PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH
GROUNDMASS IS VERY FINE-GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): <2 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 10%)
Size(mm): <3 Morphology: EUHEDRAL
FRESH
CLINOPYROXENE ( 2%)
Size(mm): <2 Morphology: ROUNDED
RARELY OIKOCRYSTS,FRESH,ZONED*
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): 0.3 Morphology: ACICULAR
CLINOPYROXENE ( 56%)
Morphology: DENDRITIC,RADIATING SHEAVES
OPAQUE MINERALS ( 5%)
Size(mm): .01 Morphology: GRANULAR
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE
Location: GROUNDMASS, Replacing: OL
Location: VESICLES
CALCITE FILLS VESICLES,OCCURS AS PATCHES IN THE
GROUNDMASS;
SMECTITE
Replacing: OL
Vesicles -
Size(mm): 0.1
Percent: <1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 630/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 859.50 Rock Type: IGNEOUS
Core: 86 Sample Midpoint(m) : 864.63 Sect/Pc #: 4/PCE 2B
ROCK = PLAG-CPX-OL MODERATELY PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: MODERATELY PORPHYRITIC,QUENCH
GROUNDMASS IS VERY FINE-GRAINED;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): TO 1.0 Morphology: EUHEDRAL
ALTERED TO SMECTITE;
PLAGIOCLASE ( 7%)
Size(mm): TO 2.0 Morphology: EUHEDRAL
FRESH,ZONED;
CLINOPYROXENE ( 1%)
Size(mm): TO 1.0 Morphology: ROUNDED
FRESH*
Groundmass - PLAGIOCLASE
Size(mm): <0.1 Morphology: ACICULAR
OPAQUE MINERALS ( 5%)
INCLUDES MAGN + ILMENITE*
Alteration - CALCITE
Location: VESICLES
SMECTITE
Replacing: OL,OL PHENOS
Vesicles -
Size(mm): <0.1
Percent: <1
Filling: CALCITE
Shape: ROUND
Leg : 53 Top/Bottom Interval(mm): 550/ 0 Describer: Mevel,C.
Hole: 418A Top of Core Depth(m) : 859.50 Rock Type: IGNEOUS
Core: 86 Sample Midpoint(m) : 866.05 Sect/Pc #: 5/PCE 4A
ROCK = PLAG-OL-CPX MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,QUENCH;
Where sampled: PILLOW INTERIOR*
Phenocrysts- OLIVINE ( 1%)
Size(mm): TO 0.8 Morphology: EUHEDRAL
ALTERED;
PLAGIOCLASE ( 5%)
Size(mm): 1.5 Morphology: EUHEDRAL
FRESH;
CLINOPYROXENE ( TR%)
Size(mm): TO 0.8 Morphology: ROUNDED
TWO ROUNDED CRYSTALS,FRESH;
SPINEL ( TR%)
Size(mm): 0.25 Morphology: EUHEDRAL
ONE CORRODED GRAIN OF BROWN SPINEL*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 0.2 Morphology: ACICULAR
CLINOPYROXENE ( 46%)
Morphology: RADIATING SHEAVES
OPAQUE MINERALS ( 8%)
Size(mm): 0.01 Morphology: GRANULAR
Alteration - CARBONATE
Location: VESICLES,
SMECTITE
Location: VESICLES Replacing: OLIVINE
SMEC IS GREEN*
Vesicles -
Size(mm): 0.1
Percent: <1
Filling: CALCITE,SMEC
Shape: ROUND
SMEC FILLING IS GREEN*
Leg : 53 Top/Bottom Interval(mm): 410/ 0 Describer: Mathez, E.
Hole: 418A Top of Core Depth(m) : 676.50 Rock Type: IGNEOUS
Core: X 1 Sample Midpoint(m) : 676.91 Sect/Pc #: /PCE 3
ROCK = PLAG MODERATELY PHYRIC BASALT
SHIPBOARD DESCRIPTION (UNEDITED);
Texture: MODERATELY PORPHYRITIC;
GROUNDMASS IS DIABASIC HAVING SUBOPHITIC CLOTS
WITH INTERSTITIAL PATCHES OF ALTERED GLASS(?) +
CPX + OP.MINS;
Where sampled: FLOW INTERIOR
UNCERTAIN WHERE SAMPLED*
Phenocrysts- OLIVINE ( <5%)
IDENTITY UNCERTAIN FOR OL,PATCHES OF SMECTITE MAY
BE ALTERED OL?;
PLAGIOCLASE ( 5%)
Size(mm): 0.5-3.3 Morphology: EUHEDRAL
STRONG NORMAL ZONING AT EDGE,RARE GLASS
INCLUSIONS PRESENT,ZONED*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): <1
CLINOPYROXENE ( 40%)
Size(mm): 0.1-1.5
OPAQUE MINERALS ( 10%)
Size(mm): 0.1
INCLUDES MAGN + ILMENITE*
Alteration - CARBONATE ( <1%)
Location: VESICLES,
Location: VEINLETS
VEINLETS ARE SPARSE;
CLAY MINERALS (10-15%)
Location: GROUNDMASS
Vesicles -
Percent: <1
Filling: CALCITE
Shape: IRREGULAR-
Shape: ROUND
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