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* |
Cite as: Deep Sea Drilling Project (1989): Archive of Core and Site/Hole Data and Photographs from the Deep Sea Drilling Project (DSDP). National Geophysical Data Center, NOAA. doi:10.7289/V54M92G2 [access date]
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