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* |
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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