Leg : 7 Top/Bottom Interval(mm): 320/ 0 Describer: Heath, R.
Hole: 63 Top of Core Depth(m) : 561.00 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 561.32 Sect/Pc #: 1/
ROCK = BASALT
DARK GRAY BASALT IRREGULARLY IN CONTACT WITH WHITE
CHALK,CHALK CONTAINS 1-5MM ANGULAR CHIPS OF
BASALT,CHALK INFO IN SMEAR SLIDE DATA BASE;
Texture: PHYRIC*
Groundmass - PLAGIOCLASE
Size(mm): TO 1 Morphology: LATHS+MOSAICS
LOCALLY ANTIPERTHITIC WITH IRREGULARLY INTERGROWN
MOSAICS;
PYROXENE
NOW PSEUDOMORPHIC CHLORITE MASSES,BASALT WAS
PROBABLY ORIGINALLY SPHERULITIC GLASS-IT HAS
ALTERED TO PALE GREEN CHLORITE AND MONTMORILLONITE
WHICH PRESERVE THE ORIGINAL TEXTURE,THE CONTACT
BETWEEN BASALT AND LIMESTONE IS HIGHLY IRREGULAR-
ALMOST STYLOLITIC AND IS MARKED BY A .05-.2MM
RIM OF IRON(?)-MANGANESE OXIDES UNDERLAIN(IN THE
BASALT) BY A .5MM CHLORITE LAYER,IN PLACES
CALCAREOUS GRAINS HAVE "LEAKED" INTO THE BASALT*
Alteration - CHLORITE
Location: BASALT, Replacing: PYX
Location: BASALT/CHALK
Location: CONTACT
Leg : 7 Top/Bottom Interval(mm): 380/ 0 Describer: Heath, R.
Hole: 63 Top of Core Depth(m) : 561.00 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 561.38 Sect/Pc #: 1/
ROCK = PLAG PHYRIC BASALT;
Texture: PHYRIC*
Phenocrysts- PLAGIOCLASE
Size(mm): 1-2
TWINNED,COMPLEXLY INTERGROWN AND SHOW CONSIDERABLE
UNMIXING,PARTIAL ALTERATION TO MONTMORILLONITE?
(USUALLY CRYSTALLOGRAPHICALLY CONTROLLED)IS
COMMON*
Groundmass - PLAGIOCLASE
Size(mm): 1-5 Morphology: LATHS,PRISMS,MOSAICS
SOMEWHAT ALTERED,APPROX COMP AN60-70 BY MICHEL-
LEVY METHOD;
PYROXENE
Morphology: SUBHEDRAL
HIGH 2V,ALMOST COLORLESS,NO PLEOCHROISM,GROUNDMASS
DOMINATED BY .1-.15MM CHLORITE XTLS,FE-OXIDES WITH
LESSER PLAG LATHS AND .05MM BLEBS OF PALE GREEN
MONTMORILLONITE?*
Alteration - CHLORITE
Location: GROUNDMASS
PINNATE BROWN;
FERROUS OXIDE
Location: GROUNDMASS
FINE;
MONTMORILLONITE
Location: GROUNDMASS
Leg : 7 Top/Bottom Interval(mm): 680/ 0 Describer: Heath, R.
Hole: 63 Top of Core Depth(m) : 561.00 Rock Type: IGNEOUS
Core: 10 Sample Midpoint(m) : 561.68 Sect/Pc #: 1/
ROCK = BASALT
PALE GREEN AND RED MASSIVE MATERIAL IN IRREGULAR
CONTACT WITH DARK GRAY BASALT,LIMESTONE INFO
IN SMEAR SLIDE DATA BASE*
Groundmass - PLAGIOCLASE
Morphology: LATHS
SCATTERED IN A SOMEWHAT PERLITIC GROUNDMASS OF
ALTERED GLASS(LOCALLY VARIOLITIC);
GLASS
ALTERED BUT STILL ALMOST ISOTROPIC.THE CONTACT IS
MARKED BY A .2MM ZONE OF VERMIFORM CHLORITE
ACICULAR MASSES,BY AN IRON(?)-MANGANESE FILM UP TO
.04MM THICK BY REXTLLIZED CALCITE WITHIN .1MM OF
THE CONTACT AND BY A PATCH OF .04MM SCAPOLITE
PRISMS SURROUNDED BY BRILLIANT BLUE-GREEN
RADIATING ACICULAR CHLORITE? XTLS GRADING OUT
(AFTER .03MM) TO COLORLESS CHLORITE? OR
MONTMORILLONITE ACICULAR MASSES THEN TO PALE BROWN
VARIOLITES(?),THE SCAPOLITE APPEARS TO BE ALTERED
AT LEAST IN PART TO MONTMORILLONITE?*
Leg : 7 Top/Bottom Interval(mm): 1230/1250 Describer: Heath, R.
Hole: 63 Top of Core Depth(m) : 563.00 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 564.24 Sect/Pc #: 1/
ROCK = PLAG PHYRIC BASALT;
Texture: PHYRIC*
Phenocrysts- PLAGIOCLASE
Size(mm): 1-2 Morphology: LATHS+AGGREGATES,EUHEDRAL
APPROX COMP AN90 OR MORE*
Groundmass - PLAGIOCLASE
Morphology: LATHS
PYROXENE
A LESSER CONSTITUENT THAN OTHERS IN GROUNDMASS.
GROUNDMASS ALSO CONSISTS OF SUBEQUAL AMOUNTS OF
PINNATE PALE BROWN CHLORITE(.5MM AGGREGATES)
PLUS FINE IRON OXIDES WITH PLAG LATHS,PLAG MUCH
LESS ALTERED THAN IN 7-63-10-1-38.IN GENERAL THE
BASALT FROM THE DEEPER LOCATION DIFFERS FROM THE
NEAR-SEDIMENT SAMPLE IN THE FOLLOWING WAYS:1)PLAG
PHENOS LESS ALTERED,2)RATIO OF XTLS TO ALTERED
GLASS MUCH HIGHER IN THE GROUNDMASS,3)MUCH LOWER
ABUNDANCE OF PALE GREEN MONTMORILLONITE? MASSES
FILLING MICROVESICLES?*
Alteration - CHLORITE
Location: GROUNDMASS
MONTMORILLONITE
Location: GROUNDMASS
ROUNDED MASSES OF PALE GREEN MONTMORILLONITE? UP
TO .3MM DIAMETER ARE MUCH LESS ABUNDANT THAN IN
7-63-10-1-38*
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