Leg : 26 Top/Bottom Interval(mm): 400/ 0 Describer: DSDP microfilm
Hole: 251A Top of Core Depth(m) : 477.00 Rock Type: IGNEOUS
Core: 29 Sample Midpoint(m) : 477.40 Sect/Pc #: 1/PCE 1
ROCK = GLASSY OLIVINE BASALT
BASALT GLASS IS DARKER RED-BROWN,
DEVITRIFIED TO A GREATER EXTENT AND
HAVING PALER, ROUGHLY CIRCULAR PATCHES;
Texture: GLASSY,PLAG-OL PHYRIC,SPHERULITIC;
Phenocrysts- OLIVINE ( 10%)
Size(mm): 0.4 Morphology: EUHEDRAL
TOTAL INCLUDES PHENOS AND MICROLITES,OL
SCATTERED THROUGHOUT ROCK, VERY FRESH
MICROPHENOS;
Groundmass - OLIVINE
Size(mm): 0.2 Morphology: SPHERULITIC,ACICULAR
INNUMERABLE INCIPIENT ACICULAR MICROLITES OF,
APPARENTLY, OL, DISPOSED IN A SLIGHTLY
SPHERULITIC TEXTURE;
LABRADORITE
ONE LARGE GLOMEROPHYRIC CLUSTER OF LABRADORITE
XTLS (6MM ACROSS)*
PLAGIOCLASE ( 2%)
GLASS ( 88%)
GLASS OR MESOSTASIS*
Leg : 26 Top/Bottom Interval(mm): 140/ 0 Describer: DSDP microfilm
Hole: 251A Top of Core Depth(m) : 489.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 491.14 Sect/Pc #: 2/
ROCK = OLIVINE BASALT;
Texture: INTERSERTAL,PLAG-CPX-OL PHYRIC*
Phenocrysts- PLAGIOCLASE ( 38%)
Size(mm): 0.1-0.3 Morphology: LATHS
AMOUNT IS FOR ALL PLAG IN SECTION,ZONED
LABRADORITE,LARGER ONES PHENOCRYSTIC;
OLIVINE ( 0.5%)
Size(mm): 0.5 Morphology: PSEUDOMORPHS
A FEW INDISTINCT AND TOTALLY ALTERED TO
BOWLINGITE-IDDINGSITE;
PYROXENE ( 37%)
Size(mm): 0.6 Morphology: PRISMS
AMOUNT IS TOTAL PYX FOR SECTION,NEUTRAL-COLORED,
AUGITIC (2V GAMMA CA 45 DEGREES), ALSO BUNCHES
OF SMALLER PRISMS AND SMALLER GRAINS*
Groundmass - GLASS ( 15%)
DARK BROWN,GLASSY MESOSTASIS;
FERROUS OXIDE ( 9.5%)
Size(mm): MESOSTASIS
SMALL GRANULES LARGELY CONCENTRATED IN THE VERY
DARK BROWN INTERSTITIAL GLASSY MESOSTATIC AREAS,
MICROLITES IN THE MESOSTASIS ARE PROBABLY
INCIPIENT IRON-OXIDES*
Alteration - BOWLINGITE
Replacing: OL
IDDINGSITE
Replacing: OL
Leg : 26 Top/Bottom Interval(mm): 50/ 0 Describer: DSDP microfilm
Hole: 251A Top of Core Depth(m) : 489.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 494.05 Sect/Pc #: 4/
ROCK = COARSE OLIVINE THOLEIITIC BASALT;
Texture: COARSE,INTERSERTAL TO SUBOPHITIC,PLAG-CPX PHYRIC
BASALT*
Phenocrysts- PLAGIOCLASE ( 45%)
Size(mm): TO 2.5 Morphology: LATHS
ZONED,AMOUNT IS TOTAL PLAG IN SECTION;
PYROXENE ( 37%)
Size(mm): TO 1.0 Morphology: PRISMS,GRAINS
BUNCHES OF PRISMS AND PRISMS, 2V GAMMA OF CA 45
DEGREES, NO PIGEONITE, HYPERSTHENE OR EXSOLUTION
LAMELLAE OBSERVED,NEUTRAL-COLORED,AUGITIC,
AMOUNT IS TOTAL PYX IN SECTION*
Groundmass - OLIVINE ( 0.25%)
Size(mm): 0.3
A VERY FEW INDISTINCT XTLS TOTALLY ALTERED TO
BOWLINGITE-IDDINGSITE;
ILMENITE ( 8.75%)
Size(mm): 0.2 Morphology: SKELETAL
FE.OX, PROBABLY ILMENITE;
GLASS
GLASS OR MESOSTASIS,INTERSTITIAL AND WELL-
CRYSTALLIZED*
Alteration - QUARTZ ( TR%)
CHLORITE ( 1%)
Location: VEINS,PATCHES
BOWLINGITE
Replacing: OL
IDDINGSITE
Replacing: OL
Leg : 26 Top/Bottom Interval(mm): 290/ 310 Describer: Kempe, D.
Hole: 251A Top of Core Depth(m) : 489.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 494.30 Sect/Pc #: 4/
ROCK = BASALT
FRESH;
Texture: COARSE,SUBOPHITIC*
Groundmass - OLIVINE
Size(mm): .3
ALTERED,RARE;
PYROXENE
Size(mm): 1.0
PLAGIOCLASE
Size(mm): 2.5
APPROX COMP AN65*
Leg : 26 Top/Bottom Interval(mm): 170/ 0 Describer: DSDP microfilm
Hole: 251A Top of Core Depth(m) : 489.50 Rock Type: IGNEOUS
Core: 31 Sample Midpoint(m) : 495.67 Sect/Pc #: 5/
ROCK = DIABASIC OLIVINE BASALT;
Texture: INTERSERTAL TO SUBOPHITIC,PLAG-PYX PHYRIC,
VERY COARSE,DIABASIC*
Phenocrysts- PLAGIOCLASE ( 46%)
Size(mm): 3.0 Morphology: LATHS
ZONED, NOTABLY WELL-TWINNED AND IN SOME CASES
SLIGHTLY MORE SODIC COMP (AN49),AMOUNT IS TOTAL
PLAG IN SECTION;
PYROXENE ( 39%)
Size(mm): 1.5 Morphology: PRISMS,GRAINS
ALSO BUNCHES OF PRISMS,2V GAMMA OF CA 45
DEGREES, NO PIGEONITE, HYPERSTHENE OR
EXSOLUTION LAMELLAE OBSERVED,NEUTRAL-COLORED
AUGITIC, AMOUNT IS TOTAL PYX IN SECTION;
OLIVINE ( 0%)
Groundmass - ILMENITE ( 9%)
Size(mm): .7 Morphology: SKELETAL
FE ORE XTLS,PROBABLY ILMENITE;
GLASS ( 5%)
GLASS OR MESOSTASIS,NOTABLY WELL CRYSTALLIZED*
Alteration - APATITE ( TR%)
CHLORITE ( 1%)
Location: VEINS,PATCHES
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