I.D. 1040C 52R-3 56-58 cm Piece 8 Described by: jm Date: 11/27 and 12/1 ROCK NAME: Baked Sediment GRAIN SIZE: Cryptocrystalline TEXTURE: Holocrystalline PRIMARY MINERALOGY PERCENT PRESENT PERCENT ORIGINAL SIZE (mm) COMPO-SITION MORPHOLOGY COMMENTS PHENOCRYSTS Olivine Plagioclase Orthopyroxene Clinopyroxene Opaque GROUNDMASS Plagioclase Olivine Clinopyroxene Mesostasis Glass 1.0 0.0 along grain boundaries ?clear glass altered to zeolite Opaques 0.0 Pyrite Chalcopyrite Quartz 95.0 95.0 <=0.001 anhedral Carbonate 4.0 <=0.001 anhedral "extensively resorbed, in pods and stringers" SECONDARY MINERALOGY PERCENT REPLACING/ FILLING COMMENTS: TOTAL 1 Saponite Fibrous zeolite 1 glass VESICLES/ CAVITIES PERCENT DISTRIBUTION SIZE (mm) FILLING SHAPE COMMENTS: Vesicles Vugs COMMENTS: I.D. 1040C 52R-4 5-12 cm Piece 2 Described by: jm Date: 11/26 and 12/1/96 ROCK NAME: Plagioclase gabbro GRAIN SIZE: Fine grained with medium glomerophenocrysts TEXTURE: Glomeroporphyritic with seriate porphyritic intergranular to intersertal matrix PRIMARY MINERALOGY PERCENT PRESENT PERCENT ORIGINAL SIZE (mm) COMPO-SITION MORPHOLOGY COMMENTS PHENOCRYSTS Olivine Plagioclase 15.0 12.0 <=3 euhedral-subhedral in glomerophenocrysts 15.0 15.0 <=0.25 euhedral laths Orthopyroxene Clinopyroxene 1.0 1.0 <=1 Augite euhedral-subhedral in glomerophenocrysts Opaque 0.0 GROUNDMASS Plagioclase 19.0 19.0 <=0.01 laths and anhedral "laths in rosettes and sprays, anhedral grains between laths, in interstitial glass pockets" Olivine Clinopyroxene Mesostasis Glass 50.0 5.0 <=0.1 interstitial; glass-rich layer dark brown glass palagonitized and partially chloritized Opaques tr <=0.005 often acicular in interstitial glass Pyrite <=0.005 Chalcopyrite tr cubes to blebs in interstitial glass SECONDARY MINERALOGY PERCENT REPLACING/ FILLING COMMENTS: TOTAL 48 Saponite 48 "glass, plagioclase gloms" Chlorite tr glass VESICLES/ CAVITIES PERCENT DISTRIBUTION SIZE (mm) FILLING SHAPE COMMENTS: Vesicles Vugs COMMENTS: Plagioclase and plagioclase -pyroxene glomerophenocrysts. 5-mm wide glass-rich band in middle of section. I.D. 1040C 52R-4 62-67 cm Piece 8 Described by: jm Date: 11/26 and 12/2 96 ROCK NAME: Pyroxene gabbro GRAIN SIZE: Fine grained with medium-coarse glomerophenocrysts TEXTURE: Glomerophenocrystic with intergranular-intersertal matrix PRIMARY MINERALOGY PERCENT PRESENT PERCENT ORIGINAL SIZE (mm) COMPO-SITION MORPHOLOGY COMMENTS PHENOCRYSTS Olivine Plagioclase 28.0 15.0 <=6 An 90 euhedral to subhedral in glomerocrysts. Some with oscillatory zoning. Often strained or fractured 30.0 30.0 <=0.3 An 78 euhedral laths "often in rosettes, sprays" Orthopyroxene Clinopyroxene 5.0 5.0 <=1.2 augite euhedral-subhedral in glomerophenocrysts 30.0 30.0 <=0.15 augite subhedral-anhedral Opaque 2.0 2.0 0.1 ?Ti-mag cubic-subhedral no exsolution lamellae GROUNDMASS Plagioclase Olivine Clinopyroxene Mesostasis Glass 5.0 0.0 interstitial pockets "green brown, altered to chlorite and palagonite" Opaques tr Pyrite Chalcopyrite tr SECONDARY MINERALOGY PERCENT REPLACING/ FILLING COMMENTS: TOTAL 8 Saponite 3 "glass, plagioclase gloms" Chlorite 5 glass VESICLES/ CAVITIES PERCENT DISTRIBUTION SIZE (mm) FILLING SHAPE COMMENTS: Vesicles Vugs COMMENTS: "Glomerophenocrysts of plagioclase only, pyroxene only, and plagioclase + pyroxene." I.D. 1040C 53R-1 5-11 cm Piece 1A Described by: jm Date:11/27 and 12/1/96 ROCK NAME: Pyroxene gabbro GRAIN SIZE: Fine grained with medium glomerocrysts TEXTURE: Glomeroporphyritic with seriate porphyritic intergranular-intersertal matrix PRIMARY MINERALOGY PERCENT PRESENT PERCENT ORIGINAL SIZE (mm) COMPO-SITION MORPHOLOGY COMMENTS PHENOCRYSTS Olivine Plagioclase 10.0 9.0 <=2 euhedral-subhedral "in glomerocrysts, sometimes zoned" 15.0 15.0 0.25 euhedral laths often in rosettes/sprays Orthopyroxene Clinopyroxene 5.0 3.0 <=1.2 Augite euhedral-subhedral in glomerocrysts. Often partly encloses plag Opaque GROUNDMASS Plagioclase 30.0 30.0 <=0.05 laths and ahedral "as rosettes, and interlath grains" Olivine Clinopyroxene 10.0 10.0 <=0.05 anhedral Mesostasis Glass 30.0 0.0 interstitial pockets dark brown glass Opaques tr <=0.002 acicular in interstitial melt pockets Pyrite Chalcopyrite tr <=0.002 blebs in interstitial glass SECONDARY MINERALOGY PERCENT REPLACING/ FILLING COMMENTS: TOTAL 31 Saponite 16 "glass, plagioclase gloms" Chlorite 15 glass VESICLES/ CAVITIES PERCENT DISTRIBUTION SIZE (mm) FILLING SHAPE COMMENTS: Vesicles Vugs COMMENTS: Plagioclase glomerocrysts and rare plagioclase + pyroxene glomerocrysts comprised of skeletal minerals I.D. 1040C 53R-1 37-41 cm Piece 1A jm Date: 11/26 and 112/2 96 ROCK NAME: Pyroxene gabbro GRAIN SIZE: Fine grained with medium glomerocrysts TEXTURE: Glomeroporphyritic with seriate porphyritic intergranular-intersertal matrix PRIMARY MINERALOGY PERCENT PRESENT PERCENT ORIGINAL SIZE (mm) COMPO-SITION MORPHOLOGY COMMENTS PHENOCRYSTS Olivine Plagioclase 3.0 2.0 <=5 euhedral-subhedral in glomerophenocrysts; often fractured and altered 35.0 35.0 .05-0.5 laths often in rosettes Orthopyroxene Clinopyroxene 2.0 2.0 <=0.25 subhedral-rounded Opaque 2.0 2.0 <=0.1 Ti-mag? cubic to subhedral GROUNDMASS Plagioclase 20.0 20.0 <=0.025 anhedral Olivine Clinopyroxene 33.0 33.0 <0.025 anhedral Mesostasis Glass 5.0 0.0 interstitial pockets "green-brown glass altered to chlorite, saponite, tr zeolite" Opaques tr Pyrite Chalcopyrite tr SECONDARY MINERALOGY PERCENT REPLACING/ FILLING COMMENTS: TOTAL 6 Saponite 2 "glass, plagioclase gloms" Chlorite 4 glass Zeolite tr glass VESICLES/ CAVITIES PERCENT DISTRIBUTION SIZE (mm) FILLING SHAPE COMMENTS: Vesicles Vugs COMMENTS: "Plagioclase glomerophenocrysts, very rare pyroxene glomerophenocrysts comprised of sub-rounded grains." I.D. 1040C 53R-2 28-31 cm Piece 4 Described by: jm Date: 11/27 and 12/1/96 ROCK NAME: Pyroxene gabbro GRAIN SIZE: Fine grained with medium glomerocrysts TEXTURE: Glomeroporphyritic with seriate porphyritic intergranular-intersertal matrix PRIMARY MINERALOGY PERCENT PRESENT PERCENT ORIGINAL SIZE (mm) COMPO-SITION MORPHOLOGY COMMENTS PHENOCRYSTS Olivine Plagioclase 7.0 6.0 <=4 euhedral-subhedral in glomerophenocrysts 25.0 25.0 <=0.15 laths often in rosettes/sprays Orthopyroxene Clinopyroxene 3.0 3.0 <=0.4 augite subhedral-rounded Opaque GROUNDMASS Plagioclase 20.0 20.0 <=0.02 anhedral Olivine Clinopyroxene 33.0 33.0 <=0.02 anhedral Mesostasis Glass 10.0 0.0 interstitial "altered to saponite, chlorite and tr. zeolite" Opaques 1.0 1.0 <0.08 Ti-mag cubic-subhedral larger grains with exsolution lamellae Pyrite Chalcopyrite SECONDARY MINERALOGY PERCENT REPLACING/ FILLING COMMENTS: TOTAL 15 Saponite 10 "glass, plagioclase gloms" Chlorite 5 glass Zeolite tr glass VESICLES/ CAVITIES PERCENT DISTRIBUTION SIZE (mm) FILLING SHAPE COMMENTS: Vesicles Vugs 2 irregular <=2 rounded "clay, chlorite and zeolite" COMMENTS: "plagioclase, pyroxene (sub-rounded grains) and plagioclase-pyroxene glomerocrysts"