Leg : 60 Top/Bottom Interval(mm): 780/ 800 Describer: Natland, J.
Hole: 461 Top of Core Depth(m) : 0.00 Rock Type: METAMORPHIC
Core: 1 Sample Midpoint(m) : 0.79 Sect/Pc #: 1/
ROCK = METAGABBRO;
Texture: POIKILOBLASTIC;
Where sampled: COBBLE IN SEDIMENTS*
Phenocrysts- AMPHIBOLE ( 35%)
PLEOCHROIC,PALE BROWN-GREEN + YELLOW GREEN-GREEN*
Groundmass - PLAGIOCLASE ( 48%)
POIKILOBLASTICALLY ENCLOSED BY AMPHIBOLE;
QUARTZ ( 15%)
MAGNETITE ( 2%)
CLINOPYROXENE ( TR%)
Morphology: RELICT
RELICT IN AMPHIBOLES*
Alteration - ZEOLITE ( TR%)
Location: IN CRACKS
RETROGRADE METAMORPHISM*
Vesicles -
Percent: 0
Leg : 60 Top/Bottom Interval(mm): 620/ 640 Describer: Sharaskin, A.
Hole: 461 Top of Core Depth(m) : 11.00 Rock Type: METAMORPHIC
Core: 3 Sample Midpoint(m) : 11.63 Sect/Pc #: 1/
ROCK = METABASALT;
Texture: NEMATOGRANOBLASTIC;
Where sampled: COBBLE IN SEDIMENT*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): 0.1-0.3 Morphology: INTERSERTAL
APPROX COMP ANDESINE(?) AND LABRADOR IN LATHS,
RECRYSTALLIZED;
AMPHIBOLE ( 20%)
Size(mm): TO 1.5
QUARTZ ( 15%)
Size(mm): 0.1-0.5
MAGNETITE ( 5%)
Size(mm): 0.02-0.1
SPHENE
COMBINATION
INCLUDES AMPH + QUARTZ + SPHENE + PLAG FROM ABOVE
ARE METAMORPHIC ASSEMBLAGE BUT NO FOLIATION*
Vesicles -
Percent: TR
VERY RARE OR NONE PRESENT*
Leg : 60 Top/Bottom Interval(mm): 160/ 180 Describer: Sharaskin, A.
Hole: 461 Top of Core Depth(m) : 11.00 Rock Type: METAMORPHIC
Core: 3 Sample Midpoint(m) : 12.55 Sect/Pc #: CC/
ROCK = META-QUARTZ DIABASE;
Texture: PSEUDOSUBOPHITIC*
Groundmass - PLAGIOCLASE ( 50%)
QUARTZ ( 20%)
AMPHIBOLE ( 15%)
CHLORITE ( 10%)
MAGNETITE ( 10%)
SPHENE ( 1%)
CLINOPYROXENE ( TR%)
Morphology: RELICTS
COMBINATION ( 100%)
ALL OF THE ABOVE MINERALS APPARENTLY REPRESENT A
METAMORPHIC ASSEMBLAGE BUT FOLIATION OR
SCHISTOSIT IS ABSENT AND ALL ELEMENTS OF ORIGINAL
DIABASE
STRUCTURE ARE PRESERVED INCLUDING RELICTS OF
QUARTZ-PLAG MICROPEGMATITIC INTERGROWTHS*
Vesicles -
Percent: TR
Filling: QUARTZ
NO VESICLES PRESENT,OR ALL ARE FILLED WITH QUARTZ
IF THEY WERE THERE ONCE*
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