Leg : 4 Top/Bottom Interval(mm): 0/ 0 Describer: Benson, W.E. Hole: 24A Top of Core Depth(m) : 550.00 Rock Type: IGNEOUS Core: 4 Sample Midpoint(m) : 551.50 Sect/Pc #: 2/ ROCK = PLAG-PYX BASALT ALTERED,ONE TS HAS DISCOASTERS AND COCCOLITHS, COMPARE TO P. 46 IN IR; Texture: APHANITIC, FINE-GRAINED* Phenocrysts- PLAGIOCLASE PYROXENE AUGITE(?), ANY PYX IN GROUNDMASS LONG GONE* Groundmass - PLAGIOCLASE ( >50%) LATHS IN 2 SIZES-LARGE + COMPARATIVELY FRESH ENCLOSING OTHER MINERALS AND SMALL LATHS IN HIGHLY ALTERED GROUNDMASS OF CHLORITE+SERP+SAUSSURITE(?) + SOME DEVITRIFIED GLASS; OLIVINE POSSIBLY SOME OL HIGHLY ALTERED TO CHLORITE + SERP; MAGNETITE Alteration - CHLORITE Location: GROUNDMASS, Replacing: OL Location: VEINS FITS ALL OBSERVABLE OPTICAL PATTERNS EXCEPT ITS X & Z ARE JUST ABOVE 1.56; SERPENTINITE Location: GROUNDMASS Replacing: OL SAUSSURITE Location: GROUNDMASS ID UNCERTAIN; BIOTITE OBSERVED FROM POWDER ON SMEAR SLIDES,ALTERING TO CHLORITE; PYRITE Location: DISSEMINATED, Location: VEINLETS IN VEINS IS IN TETRAHEDRA EXCEPT FOR A POCKET WHICH HAS CUBES MODIFIED BY OCTRAHEDRA, ALTERATIONS SEEM TO HAVE OCCURRED SOON AFTER CRYSTALLIZATION-POSSIBLY DEUTERIC; CALCITE Location: DISSEMINATED, Location: VEINLETS ZEOLITE Replacing: PYX SMALL SPHERULES ARE PARTLY TO COMPLETELY FILLED, TYPICALLY THEY HAVE ISOTROPIC RIMS & A LAYER OF WHITE FIBROUS ZEOLITE (NATROLITE?) OR ALBITE AND A CENTER OF FIBROUS GREEN CHLORITE, SOME OF THEIR SPHERULES MAY BE REPLACEMENT OF PYX PHENOS* |
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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