Leg : 32 Top/Bottom Interval(mm): 1450/ 0 Describer: Marshall, M.
Hole: 307 Top of Core Depth(m) : 297.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 298.95 Sect/Pc #: 1/
ROCK = BASALT
SOURCE IS IR,
Leg : 32 Top/Bottom Interval(mm): 1450/ 0 Describer: Marshall, M.
Hole: 307 Top of Core Depth(m) : 297.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 298.95 Sect/Pc #: 1/
ONLY A VAGUE SUGGESTION OF FORMER IGNEOUS TEXTURE,
ROCK IS NOW COMPOSED OF CLEAR PATCHES OF
MONTMORILLONITE,TINY RED GRANULES OF GOETHITE(?)
AND PATCHES OF A MURKY MATERIAL(X-RAY ANALYSIS
OF A SAMPLE SEVERAL CM REMOVED SHOWS THE PRESENCE
OF K-FELDSPAR,CELADONITE,CHLORITE AND
MONTMORILLONITE)*
Alteration - MONTMORILLONITE
GOETHITE
ID UNCERTAIN FOR GOETHITE*
Leg : 32 Top/Bottom Interval(mm): 770/ 0 Describer: Marshall, M.
Hole: 307 Top of Core Depth(m) : 307.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 307.77 Sect/Pc #: 1/PCE 3
ROCK = BASALT
ALTERED;
Phenocrysts- PLAGIOCLASE
Size(mm): 1
GLOMEROPHENOS-SCATTERED*
Groundmass - PLAGIOCLASE
Size(mm): .02X.2 Morphology: LATHS
FAIRLY SEVERELY ALTERED;
PYROXENE
Size(mm): .075
TOTALLY ALTERED TO MONTMORILLONITE(?);
MAGNETITE
SEVERELY ALTERED TO UNIDENTIFIED MINERAL*
Leg : 32 Top/Bottom Interval(mm): 780/ 820 Describer: Marshall, M.
Hole: 307 Top of Core Depth(m) : 307.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 307.80 Sect/Pc #: 1/
ROCK = BASALT
SOURCE IS IR*
Groundmass - PYROXENE
ALTERED TO MONTMORILLONITE;
OPAQUE MINERALS
CLOUDS OF DARK GRANULAR MATERIAL HAVE REPLACED
AND RETAIN THE FORM OF THE SKELETAL OPAQUES;
PLAGIOCLASE
HIGHLY ALTERED,X-RAY ANALYSIS SHOWS THE SAMPLE TO
CONSIST OF A LITTLE PLAG,MUCH K-FELDSPAR,AS WELL
AS CELADONITE AND MONTMORILLONITE*
Alteration - MONTMORILLONITE
Replacing: PYX
Leg : 32 Top/Bottom Interval(mm): 1460/ 0 Describer: Marshall, M.
Hole: 307 Top of Core Depth(m) : 307.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 308.46 Sect/Pc #: 1/PCE 9
ROCK = BASALT;
SAME AS 13-1-77 EXCEPT PLAG AND MAGNETITE LESS
ALTERED*
Leg : 32 Top/Bottom Interval(mm): 270/ 290 Describer: Marshall, M.
Hole: 307 Top of Core Depth(m) : 307.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 308.78 Sect/Pc #: 2/
ROCK = BASALT
SOURCE IS IR;
Texture: INTERGRANULAR*
Phenocrysts- PLAGIOCLASE
OCCASIONAL PHENOS*
Groundmass - PLAGIOCLASE
Morphology: LATHS
MOSTLY FRESH;
PYROXENE
SOMEWHAT FEATHERY,MOSTLY FRESH*
Alteration - MONTMORILLONITE
Location: VESICLES, Replacing: PYX
Location: PATCHES
GREEN,THERE ARE RED COLORED AREAS(GOETHITE-STAINED
MONTMORILLONITE?)WHERE THE ALTERATION,ESPECIALLY
OF PYX,IS MUCH MORE INTENSE*
Vesicles -
Filling: MONTMORILLONITE
Leg : 32 Top/Bottom Interval(mm): 800/ 820 Describer: Marshall, M.
Hole: 307 Top of Core Depth(m) : 307.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 309.31 Sect/Pc #: 2/
ROCK = BASALT
SOURCE IS IR;
Texture: PLUMOSE
FINER GRAINED THAN 32-307-13-2-27-29 AND THEREFORE
PROBABLY CLOSER TO THE CRUST,YET LESS ALTERED*
Groundmass - PLAGIOCLASE
Morphology: MICROLITES
SCATTERED*
Alteration - MONTMORILLONITE
PATCHES OF GREEN MONTMORILLONITE BETWEEN THE
FIBROUS PLUMES*
Leg : 32 Top/Bottom Interval(mm): 870/ 0 Describer: Marshall, M.
Hole: 307 Top of Core Depth(m) : 307.00 Rock Type: IGNEOUS
Core: 13 Sample Midpoint(m) : 309.37 Sect/Pc #: 2/PCE 13
ROCK = BASALT AND BRECCIA
ALTERED;
Texture: FEATHERY,FINE-GRAINED*
Groundmass - PLAGIOCLASE
Size(mm): .02X.2 Morphology: LATHS
PYROXENE
Size(mm): .1 Morphology: FEATHERY
SOME ALTERATION OF PLAG AND PYX,HARD TO ESTIMATE
BECAUSE OF FEATHERY,FINE GRAINED XTLS*
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