Leg : 33 Top/Bottom Interval(mm): 1410/1430 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 906.92 Sect/Pc #: 1/ ROCK = AUGITE-PLAG MODERATELY PHYRIC BASALT MODERATELY ALTERED,SOURCE IS IR; Texture: MODERATELY PHYRIC,DIABASIC-INTERSERTAL* Phenocrysts- PLAGIOCLASE ( 1%) Size(mm): .4X1 MICROPHENOS ALMOST ENTIRELY ALTERED TO MONTMORILLONITE; AUGITE ( 1.5%) Size(mm): .6 MICROPHENOS FRESH* Groundmass - PLAGIOCLASE PARTLY ALTERED; PYROXENE CONSISTS OF AUGITE AND CA-POOR AUGITE SLIGHTLY ALTERED TO MONTMORILLONITE; GLASS PART OF GROUNDMASS APPEARS TO HAVE BEEN GLASSY, INTERSERTAL BUT NOW IS COMPLETELY ALTERED TO BROWN MONTMORILLONITE,NO NEPHELINE OR K-FELDSPAR OBSERVED,ALL PERCENTAGES OBTAINED BY POINT COUNT (300 POINTS AVERAGE) AND ROUNDED TO NEAREST .5%* Alteration - MONTMORILLONITE Location: VESICLES Replacing: PLAG+GLASS Vesicles - Size(mm): .5-10 Percent: 24.5 Filling: MONT AVERAGE SIZE 2MM,PARTIALLY TO COMPLETELY FILLED, GREEN MONT* Leg : 33 Top/Bottom Interval(mm): 1440/1460 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 906.95 Sect/Pc #: 1/ ROCK = AUGITE-PLAG MODERATELY PHYRIC BASALT SAME AS 31-1-144-146 EXCEPT IN REFLECTED LIGHT TINY SKELETAL MAGNETITES SCATTERED THROUGH ROCK, SOME APPARENTLY ALTERED BY AN OPAQUE NONREFLECTIVE MATERIAL,ILMENITE LATHS PRESENT BUT NOT ABUNDANT; CHALCOPYRITE PRESENT AS TINY SPHERES AND VEINLETS, IN SOME CASES INTERGROWN WITH PYRRHOTITE, SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 340/ 360 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 907.35 Sect/Pc #: 2/ ROCK = AUGITE MODERATELY PHYRIC BASALT HEAVILY ALTERED,SOURCE IS IR; Texture: MODERATELY PHYRIC,DIABASIC* Phenocrysts- AUGITE ( 6.5%) Size(mm): .5 ONLY THE PYX MICROPHENOS ESCAPE RATHER EXTENSIVE MONTMORILLONITE ALTERATION; PLAGIOCLASE ( 0%) Groundmass - GROUNDMASS ( 64.0%) Size(mm): <.1 PLAGIOCLASE PYROXENE PART OF GROUNDMASS PLAG AND MOST OF GROUNDMASS PYX IS ALTERED,VERY SIMILAR TO 31-1-141-143 EXCEPT FOR INCREASED MICROPHENO CONTENT AND SOMEWHAT GREATER DEGREE OF ALTERATION OF ROCK,NO NEPHELINE OR K-FELDSPAR* Alteration - MONTMORILLONITE Location: VESICLES Replacing: PLAG+AUGITE Vesicles - Size(mm): .5-10 Percent: 29.5 Filling: MONT AVERAGE SIZE 2.5MM,GREEN MONT* Leg : 33 Top/Bottom Interval(mm): 370/ 390 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 907.38 Sect/Pc #: 2/ ROCK = AUGITE MODERATELY PHYRIC BASALT MODERATELY ALTERED.SOURCE IS IR; Texture: MODERATELY PHYRIC,DIABASIC* Phenocrysts- AUGITE ( 6%) Size(mm): .5 UNALTERED* Groundmass - PLAGIOCLASE MOST IS FRESH; PYROXENE CONSISTED OF AUGITE AND CA-POOR AUGITE AND IS PARTIALLY ALTERED TO MONTMORILLONITE,CONTAINED LESS GLASS THAN 31-1-141-143,VERY SIMILAR TO 31-1- 141-143 EXCEPT THAT MICROPHENO COUNT REMAINS HIGH LIKE 31-2-34-36,BUT ROCK IS MUCH FRESHER,IN REFLECTED LIGHT IS SIMILAR TO 31-1-144-146 BUT SEVERAL GRAINS OF RED-BROWN CHROMITE OBSERVED* Vesicles - Size(mm): .5-10 Percent: 30 AVERAGE SIZE 3MM,VESICLES AS IN 31-2-34-36* Leg : 33 Top/Bottom Interval(mm): 240/ 260 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 908.75 Sect/Pc #: 3/ ROCK = AUGITE PHYRIC BASALT SOMEWHAT ALTERED,SOURCE IS IR; Texture: PHYRIC,INTERSERTAL* Phenocrysts- AUGITE ( 11.5%) Size(mm): .7 FRESH* Groundmass - GROUNDMASS ( 83.5%) Size(mm): <.3 PYROXENE CONSISTS OF AUGITE AND CA-POOR AUGITE LARGELY UNALTERED; PLAGIOCLASE APPEARS FRESH BUT ALL FORMER INTERSERTAL GLASS IN GROUNDMASS HAS BEEN ALTERED TO BROWN MONTMORILLONITE,NO NEPHELINE OR K-FELDSPAR PRESENT* Vesicles - Size(mm): .3-1.5 Percent: 5 Filling: MONT+CALCITE AVERAGE SIZE .5MM,VUGS LESS ABUNDANT THAN FLOW UNITS 1 AND 2,LINED WITH DARK BROWN MONTMORILLONITE AND PARTIALLY FILLED WITH GREEN MONTMORILLONITE,A FEW ROUND VESICLES ARE FILLED ONLY WITH CALCITE* Leg : 33 Top/Bottom Interval(mm): 270/ 290 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 908.78 Sect/Pc #: 3/ ROCK = AUGITE PHYRIC BASALT SAME AS 31-3-24-26 EXCEPT IN REFLECTED LIGHT MAGNETITE IS SCATTERED EVENLY THROUGH THE ROCK, SOME APPARENTLY ALTERED BY AN OPAQUE NONREFLECTIVE MATERIAL,ILMENITE IS SPARSE AND OCCURS AS RARE LATHS,CHALCOPYRITE OCCURS AS TINY BLEBS AND LINES SOME VESICLE WALLS,SOME IS INTERGROWN WITH PYRRHOTITE* Leg : 33 Top/Bottom Interval(mm): 980/1000 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 909.49 Sect/Pc #: 3/ ROCK = AUGITE MODERATELY PHYRIC BASALT SOMEWHAT ALTERED,SOURCE IS IR; Texture: MODERATELY PHYRIC,DIABASIC-INTERSERTAL* Phenocrysts- AUGITE ( 4.5%) Size(mm): 1 FRESH* Groundmass - GROUNDMASS ( 83.5%) Size(mm): <.2 PYROXENE CONSISTS OF AUGITE AND CA-POOR AUGITE LARGELY UNALTERED; PLAGIOCLASE FRESH,ROCK CONTAINED LESS INTERSERTAL GLASS THAN 31-3-24-26 BUT IT IS ALTERED TO BROWN MONTMORILLONITE* Alteration - MONTMORILLONITE Location: VUGS Replacing: GLASS CALCITE Location: VESICLES Vesicles - Size(mm): .2-1 Percent: 12 Filling: CALCITE+MONT AVERAGE SIZE .3MM,VUGS ARE SMALLER BUT MORE ABUNDANT THAN IN 31-3-27-29 BUT PARTIALLY FILLED IN THE SAME MANNER BY GREEN MONTMORILLONITE, CALCITE PARTIALLY TO COMPLETELY FILLS VESICLES* Leg : 33 Top/Bottom Interval(mm): 1010/1030 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 909.52 Sect/Pc #: 3/ ROCK = AUGITE MODERATELY PHYRIC BASALT SAME AS 31-3-98-100 EXCEPT IN REFLECTED LIGHT MAGNETITE IS SCATTERED EVENLY THROUGH ROCKS, APPARENTLY ALTERED BY AN OPAQUE,NONREFLECTIVE MATERIAL,ILMENITE AND CHALCOPYRITE PRESENT BUT VERY SPARSE, SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 770/ 790 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 910.78 Sect/Pc #: 4/ ROCK = APHYRIC BASALT SOMEWHAT ALTERED,SOURCE IS IR; Texture: APHYRIC,DIABASIC-INTERSERTAL* Groundmass - GROUNDMASS ( 83.5%) Size(mm): <.4 PYROXENE CONSISTS OF AUGITE AND CA-POOR AUGITE,UNALTERED; PLAGIOCLASE Morphology: LATHS FRESH,GROUNDMASS GLASS,WHERE ONCE PRESENT,IS ALTERED TO BROWN MONTMORILLONITE; QUARTZ A SMALL AMOUNT IS PRESENT INTERSERTALLY BETWEEN PLAG LATHS,NO NEPHELINE OR K-FELDSPAR PRESENT* Alteration - MONTMORILLONITE Location: VUGS Replacing: GLASS CALCITE Location: VESICLES Vesicles - Size(mm): 1-5 Percent: 16.5 Filling: MONT+CALCITE AVERAGE SIZE 2MM,VUGS ARE LINED WITH BROWN MONTMORILLONITE AND GENERALLY FILLED WITH GREEN MONTMORILLONITE,SOME CALCITE IS IN THE CENTERS OF VESICLES* Leg : 33 Top/Bottom Interval(mm): 800/ 820 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 910.81 Sect/Pc #: 4/ ROCK = AUGITE MODERATELY PHYRIC BASALT IN REFLECTED LIGHT MUCH LIKE 31-3-101-103 BUT CONSIDERABLY MORE CHALCOPYRITE IS PRESENT AND A FEW RED-BROWN CHROMITES OCCUR IN THE SECTION, QUARTZ IDENTIFIED FROM VESICLE FILLING BY X-RAY, BUT NOT SEEN IN THIN SECTION,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 911.60 Sect/Pc #: CC/ ROCK = AUGITE-CA-POOR AUGITE-PLAG PHYRIC BASALT MODERATELY ALTERED,SOURCE IS IR; Texture: MODERATELY PHYRIC,DIABASIC-INTERSERTAL* Phenocrysts- PLAGIOCLASE ( 1.5%) Size(mm): .6 AUGITE ( 6.5%) AUGITE ( 2.0%) CA-POOR AUGITE,PYX MICROPHENOS UNALTERED* Groundmass - GROUNDMASS ( 81%) Size(mm): <.4 PYROXENE CONSISTS OF AUGITE AND CA-POOR AUGITE UNALTERED; PLAGIOCLASE VERY SPARSELY ALTERED TO MONTMORILLONITE; GLASS GROUNDMASS GLASS IS COMPLETELY ALTERED TO BROWN MONTMORILLONITE,IDENTICAL TO 31-4-80-82 EXCEPT FOR MICROPHENOS* Alteration - MONTMORILLONITE Location: VESICLES Replacing: PLAG+GLASS CALCITE Location: VESICLES Vesicles - Size(mm): .6-4 Percent: 9 Filling: MONT,CALCITE AVERAGE SIZE 1.25MM,GREEN MONT* Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 905.50 Rock Type: IGNEOUS Core: 31 Sample Midpoint(m) : 911.60 Sect/Pc #: CC/ ROCK = CPX MICROPHYRIC BASALT SOURCE IS SHIPBOARD DESCRIPTION; Texture: AUGITE MICROPHYRIC, DIABASIC TO INTERSERTAL GROUNDMASS* Phenocrysts- AUGITE ( 12.5%) Size(mm): .5-.7 AVG SIZE .6MM,HIGH BIREFRINGENCE,APPEARS TO BE AUGITE* Groundmass - AUGITE ( 15%) PLAGIOCLASE ( 40%) Morphology: LATH-LIKE PIGEONITE ( 10%) BOTH AUGITE AND PIGEONITE FORM DIABASIC AGGREGATES CONTAINING FELDSPAR,PIGEONITE IDENTIFIED BY LOW BIREFRINGENCE AND SMALL + 2V; GLASS ( 12.5%) GLASS IN TRIANGULAR PATCHES BETWEEN PLAG,APPEARS TO BE ENTIRELY ALTERED TO PALAG MATERIAL; OPAQUE MINERALS ( >5%) LOCALIZED NEAR GLASS* Alteration - CALCITE ( TR%) ZEOLITE PALAGONITE Replacing: GLASS CHLOROPHAEITE GREEN ALTERATION MAY BE CHLOROPHAEITE?* Vesicles - Size(mm): 0.6-4.0 Location: ZEO Filling: L,CALCITE, IRR Shape: EGULAR- Location: OTH Filling: ER ROU Shape: NDED AVG 1.25MM, COMPLETELY FILLED, MOSTLY BY GREEN FIBROUS TO GRANULAR MATERIAL THAT APPEARS VERY DARK GREEN IN HAND SAMPLES, A FEW ZEOLITES PRESENT IN VESICLES AND A VERY SMALL AMOUNT OF CALCITE, ROCK IS VESICULAR* Leg : 33 Top/Bottom Interval(mm): 810/ 830 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 915.82 Sect/Pc #: 1/ ROCK = AUGITE-PLAG-CA-POOR AUGITE MOD PHRYRIC BASALT SOMEWHAT ALTERED,SOURCE IS IR; Texture: MODERATELY PHYRIC,DIABASIC-INTERSERTAL* Phenocrysts- PLAGIOCLASE ( 1.5%) Size(mm): .5 AUGITE ( 3.5%) FRESH; AUGITE ( 1.0%) CA-POOR AUGITE* Groundmass - GROUNDMASS ( 75.5%) Size(mm): <.4 PYROXENE UNALTERED; PLAGIOCLASE Morphology: LATHS FRESH; GLASS GROUNDMASS FORMERLY GLASS IS COMPLETELY ALTERED TO BROWN MONTMORILLONITE,NO NEPHELINE OR K-FELDSPAR* Alteration - MONTMORILLONITE Location: VESICLES+VUGS Replacing: GLASS CALCITE Location: VESICLES Vesicles - Size(mm): 1-8 Percent: 18.5 Filling: MONT+CALCITE AVERAGE SIZE 2MM,VESICLES AND VUGS HAVE RIMS OF BROWN MONTMORILLONITE,PARTIALLY FILLED WITH GREEN MONTMORILLONITE AND CALCITE* Leg : 33 Top/Bottom Interval(mm): 840/ 860 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 915.85 Sect/Pc #: 1/ ROCK = AUGITE-PLAG-CA-POOR AUGITE MOD PHRYRIC BASALT SAME AS 32-1-81-83 EXCEPT MAGNETITE IS SCATTERED EVENLY THROUGH THE ROCK AND CONTAINS A FEW BLEBS OF EXSOLVED ILMENITE, IS PARTLY ALTERED TO AN OPAQUE,NONREFLECTIVE MATERIAL,ILMENITE LATHS AND CHALCOPYRITE BLEBS PRESENT,BUT ARE NOT ABUNDANT, SOME CHALCOPYRITE IS INTERGROWN WITH PYRRHOTITE, SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 720/ 740 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 917.23 Sect/Pc #: 2/ ROCK = AUGITE-CA-POOR AUGITE MODERATELY PHYRIC BASALT SOURCE IS IR; Texture: MODERATELY PHYRIC,DIABASIC-INTERSERTAL* Phenocrysts- AUGITE ( 5.5%) Size(mm): .5 AUGITE ( 2%) CA-POOR AUGITE* Groundmass - GROUNDMASS ( 80%) Size(mm): <.4 SAME AS 32-1-81-83* Vesicles - Size(mm): .5-3 Percent: 12.5 AVERAGE SIZE 1MM* Leg : 33 Top/Bottom Interval(mm): 750/ 770 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 917.26 Sect/Pc #: 2/ ROCK = AUGITE-CA-POOR AUGITE MODERATELY PHYRIC BASALT SAME AS 32-2-72-74 EXCEPT NO CALCITE NOTED,ALSO SAME AS 32-1-84-86 EXCEPT MAGNETITE DOES NOT EXSOLVE ILMENITE,IS LESS ALTERED,AND MORE ILMENITE IS PRESENT IN THE ROCK,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 835/ 840 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.84 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MODERATELY PHYRIC BASALT SAME AS 32-2-72-74 AND 32-2-75-77,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 840/ 850 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.85 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SOURCE IS IR; Texture: MICROPHYRIC,DIABASIC-INTERSERTAL* Phenocrysts- AUGITE ( 5-9%) AUGITE ( 5-9%) CA-POOR AUGITE,VARIABILITY OF MICROPHENOS MORE APPARENT THAN REAL DUE TO THE DEFINITION OF MICROPHENOS AS BEING LESS THAN .5MM IN SIZE* Groundmass - PLAGIOCLASE PYROXENE PYX/PLAG RATIO IS CONSTANT* ALTERATION IS AS DESCRIBED IN 32-1-81-83 AND 32-3- 103-105* Vesicles - Percent: 9-15 CONTENT VARIES DEPENDING ON WHETHER THE LARGER VUGS ARE PRESENT IN CERTAIN SECTIONS* Leg : 33 Top/Bottom Interval(mm): 850/ 860 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.85 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 860/ 880 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.87 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 870/ 890 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.88 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85.X-RAY DIFFRACTION SHOWS PLAG, PYX AND MONTMORILLONITE,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 900/ 915 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.91 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 915/ 930 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.92 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 930/ 945 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.94 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 945/ 960 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.95 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 960/ 978 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.97 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 985/ 993 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 918.99 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 993/1000 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 919.00 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MICROPHYRIC BASALT SAME AS 32-3-84-85,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 1030/1050 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 919.04 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MODERATELY PHYRIC BASALT SOMEWHAT ALTERED,SOURCE IS IR* Texture: MODERATELY PHYRIC,DIABASIC-INTERSERTAL* Phenocrysts- AUGITE ( 5%) Size(mm): .5 UNALTERED; AUGITE ( 2%) CA-POOR AUGITE* Groundmass - GROUNDMASS ( 83.5%) Size(mm): <.4 PYROXENE CONSISTS OF AUGITE AND CA-POOR AUGITE AND IS UNALTERED; PLAGIOCLASE FRESH; GLASS FORMER GROUNDMASS GLASS IS ALTERED TO BROWN MONTMORILLONITE* Vesicles - Size(mm): .5-7 Percent: 9 Filling: MONT+CALCITE AVERAGE SIZE 1MM,FILLED WITH BROWN MONTMORILLONITE RIMS,GREEN MONTMORILLONITE,AND CALCITE CORES* Leg : 33 Top/Bottom Interval(mm): 1060/1080 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 919.07 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MODERATELY PHYRIC BASALT SAME AS 32-3-103-105 EXCEPT IN REFLECTED LIGHT OPAQUE MINERALS SCATTERED THROUGH SECTION EVENLY, BUT NOW CONSISTS OF COMPLEX MAGNETITE-ILMENITE INTERGROWTHS,NO FREE ILMENITE OBSERVED,VERY MINOR CHALCOPYRITE BLEBS PRESENT,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 1115/1120 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 919.12 Sect/Pc #: 3/ ROCK = AUGITE-CA-POOR AUGITE MODERATELY PHYRIC BASALT SAME AS 32-3-103-105 AND SAME AS 32-3-106-108 EXCEPT VERY MINOR AMOUNTS OF FREE ILMENITE WERE OBSERVED,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 730/ 750 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 920.24 Sect/Pc #: 4/ ROCK = APHYRIC BASALT MODERATELY ALTERED,SOURCE IS IR; Texture: APHYRIC,INTERSERTAL DIABASIC* Groundmass - PYROXENE AUGITE AND CA-POOR AUGITE,SLIGHTLY ALTERED TO MONTMORILLONITE; PLAGIOCLASE SLIGHTLY ALTERED TO MONTMORILLONITE; GLASS FORMER INTERSERTAL GLASS IS MUCH MORE ABUNDANT THAN IN PREVIOUS SECTIONS OF THIS FLOW UNIT, COMPLETELY ALTERED TO MONTMORILLONITE* Alteration - MONTMORILLONITE Location: VUGS Replacing: PYX+PLAG+GLASS CALCITE Location: VUGS Vesicles - Size(mm): 1-10 Percent: 23.5 AVERAGE SIZE 6MM,VUGS ARE VERY LARGE AND ALTERED TO MONTMORILLONITE AND CALCITE* Leg : 33 Top/Bottom Interval(mm): 760/ 780 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 920.27 Sect/Pc #: 4/ ROCK = BASALT IN REFLECTED LIGHT MAGNETITE IS SCATTERED EVENLY THROUGH THE ROCK,VERY LITTLE EXSOLVING ILMENITE, MAGNETITE IS PARTLY ALTERED TO OPAQUE, NONREFLECTIVE MATERIAL,ILMENITE BLADES AND CHALCOPYRITE BLEBS ARE VERY SPARSE,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 1230/1250 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 920.74 Sect/Pc #: 4/ ROCK = APHYRIC BASALT SOMEWHAT ALTERED,SOURCE IS IR; Texture: APHYRIC,DIABASIC-INTERSERTAL* Groundmass - PYROXENE AUGITE AND CA-POOR AUGITE,FRESH; FELDSPAR FRESH; GLASS FORMER INTERSERTAL GLASS IS SOMEWHAT LESS ABUNDANT THAN IN FLOW UNIT 5,BUT COMPLETELY ALTERED TO BROWN MONTMORILLONITE,NO NEPHELINE OR K-FELDSPAR* Alteration - MONTMORILLONITE Location: VESICLES Replacing: GLASS CALCITE ( 0%) NONE SEEN IN X-RAY DIFFRACTION OR OPTICALLY* Vesicles - Size(mm): .5-2 Percent: 6 Filling: MONT AVERAGE SIZE 1MM,GREEN MONT* Leg : 33 Top/Bottom Interval(mm): 1260/1280 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 920.77 Sect/Pc #: 4/ ROCK = APHYRIC BASALT SAME AS 32-4-123-125 EXCEPT IN REFLECTED LIGHT COMPLEX MAGNETITE-ILMENITE INTERGROWTHS ARE SCATTERED EVENLY THROUGHOUT THE ROCK,A VERY FEW ILMENITE LATHS ARE SEEN IN FORMERLY GLASSY AREAS, VERY SPARSE TINY BLEBS OF CHALCOPYRITE,SOME ARE INTERGROWN WITH PYRRHOTITE,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 920/ 940 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 921.93 Sect/Pc #: 5/ ROCK = APHYRIC BASALT SOURCE IS IR; Texture: APHYRIC,DIABASIC-INTERSERTAL* Groundmass - GROUNDMASS ( 94%) Size(mm): <.4 SAME AS 32-4-123-125* Vesicles - Size(mm): .5-2 Percent: 6 AVERAGE SIZE 1MM* Leg : 33 Top/Bottom Interval(mm): 950/ 970 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 921.96 Sect/Pc #: 5/ ROCK = APHYRIC BASALT SAME AS 32-5-92-94 AND 32-4-126-128* Leg : 33 Top/Bottom Interval(mm): 1030/1050 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 922.04 Sect/Pc #: 5/ ROCK = APHYRIC BASALT SAME AS 32-5-92-96 AND 32-4-126-128, X-RAY DIFFRACTION PATTERN SHOWS PLAG,PYX,MAGN AND MONTMORILLONITE,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 1100/1120 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 923.61 Sect/Pc #: 6/ ROCK = APHYRIC BASALT SOURCE IS IR; Texture: APHYRIC,DIABASIC-INTERSERTAL* Groundmass - GROUNDMASS ( 89.5%) Size(mm): <.4 SAME AS 32-4-123-125 BUT AMOUNT OF ALTERED INTERSERTAL GLASS IS SOMEWHAT LESS* Vesicles - Size(mm): .5-2 Percent: 10.5 AVERAGE SIZE 1MM,SAME AS 32-4-123-125 BUT SLIGHTLY MORE VESICULAR* Leg : 33 Top/Bottom Interval(mm): 1130/1150 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 923.64 Sect/Pc #: 6/ ROCK = APHYRIC BASALT SAME AS 32-6-110-112 AND 32-4-126-128, SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 1150/1170 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 923.66 Sect/Pc #: 6/ ROCK = APHYRIC BASALT SOURCE IS IR; Texture: APHYRIC,DIABASIC-INTERSERTAL* Groundmass - GROUNDMASS ( 89.5%) Size(mm): <.4 PLAGIOCLASE X-RAY DETERMINATION-AVERAGE COMP AN73.5* SAME AS 32-6-110-112 BUT THE AMOUNT OF ALTERED INTERSERTAL GLASS IS <5%* Vesicles - Size(mm): .5-2 Percent: 10.5 AVERAGE SIZE 1MM.SAME AS 32-6-110-112 BUT VESICLES ARE MORE ABUNDANT IN THIS PART OF THE FLOW UNIT* Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 915.00 Rock Type: IGNEOUS Core: 32 Sample Midpoint(m) : 924.10 Sect/Pc #: CC/ ROCK = APHYRIC BASALT SOURCE IS IR; Texture: APHYRIC,DIABASIC INTERSERTAL* Groundmass - GROUNDMASS ( 91.5%) Size(mm): <.4 SAME AS 32-6-115-117 BUT SMALL CALCITE VEIN CUTS SAMPLE,CALCITE ALSO FOLLOWS SOME VESICLE WALLS AND OCCURS AS REPLACEMENT PATCHES LOCALLY* AVERAGE SIZE 1MM* Vesicles - Size(mm): .5-2 Percent: 8.5 Leg : 33 Top/Bottom Interval(mm): 370/ 390 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 924.88 Sect/Pc #: 1/ ROCK = APHYRIC BASALT SAME FLOW UNIT AS 33-1-135-137, X-RAY DIFFRACTION PATTERN SHOWS PLAG+PYX+ MONTMORILLONITE* Leg : 33 Top/Bottom Interval(mm): 1350/1370 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 925.86 Sect/Pc #: 1/ ROCK = APHYRIC BASALT SOMEWHAT ALTERED,SOURCE IS IR; Texture: APHYRIC,DIABASIC-INTERSERTAL* Groundmass - GROUNDMASS ( 91.5%) Size(mm): <.4 PYROXENE AUGITE AND CA-POOR AUGITE,FRESH; FELDSPAR FRESH; GLASS ( 5%) FORMER GROUNDMASS GLASS ALTERED TO BROWN MONTMORILLONITE,NO NEPHELINE OR K-FELDSPAR* Alteration - CALCITE ( 0%) NONE SEEN IN THE SECTION OR X-RAY DIFFRACTION PATTERN* Vesicles - Size(mm): .5-2 Percent: 8.5 Filling: MONT AVERAGE SIZE 1MM,GREEN MONT* Leg : 33 Top/Bottom Interval(mm): 1380/1400 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 925.89 Sect/Pc #: 1/ ROCK = APHYRIC BASALT SAME AS 33-1-135-137 EXCEPT IN REFLECTED LIGHT COMPLEX MAGNETITE ILMENITE INTERGROWTHS ARE SCATTERED THROUGHOUT THE ROCK,A VERY FEW ILMENITE LATHS ARE PRESENT IN FORMERLY GLASSY AREAS, SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 790/ 810 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 926.80 Sect/Pc #: 2/ ROCK = APHYRIC BASALT SOURCE IS IR; Texture: APHYRIC,DIABASIC INTERSERTAL* Groundmass - GROUNDMASS ( 91.5%) Size(mm): <.4 SAME AS 33-1-135-137* Vesicles - Size(mm): .5-2 Percent: 8.5 AVERAGE SIZE 1MM* Leg : 33 Top/Bottom Interval(mm): 820/ 840 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 926.83 Sect/Pc #: 2/ ROCK = APHYRIC BASALT SAME AS 33-2-79-81,SOURCE IS IR* SAME AS 33-1-138-140 EXCEPT X-RAY VESICLE FILLING SHOWS POSSIBLE CELADONITE* Leg : 33 Top/Bottom Interval(mm): 910/ 930 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 928.42 Sect/Pc #: 3/ ROCK = APHYRIC BASALT MODERATELY ALTERED,SOURCE IS IR; Texture: APHYRIC,DIABASIC-INTERSERTAL* Groundmass - GROUNDMASS ( 91%) Size(mm): <.4 PYROXENE AUGITE AND CA-POOR AUGITE FRESH; PLAGIOCLASE FRESH; GLASS FORMER GROUNDMASS GLASS IS MORE ABUNDANT THAN 33-1-135-137 AND 33-2-79-81 AND COMPLETELY ALTERED TO BROWN MONTMORILLONITE* Alteration - MONTMORILLONITE Location: VESICLES Replacing: GLASS CALCITE ( 0%) NONE SEEN IN SECTION OR X-RAY DIFFRACTION PATTERN* Vesicles - Size(mm): .5-1.5 Percent: 9 Filling: MONT AVERAGE SIZE .8MM,GREEN MONT* Leg : 33 Top/Bottom Interval(mm): 940/ 960 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 928.45 Sect/Pc #: 3/ ROCK = APHYRIC BASALT SAME AS 33-3-91-93 EXCEPT IN REFLECTED LIGHT OPAQUES ARE ABOUT EQUALLY DIVIDED BETWEEN COMPLEX MAGNETITE-ILMENITE INTERGROWTHS,FREE ILMENITE,AND FREE PINKISH MAGNETITE,VERY SPARSE CHALCOPYRITE BLEBS,SOME ARE INTERGROWN WITH PYRRHOTITE, SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 1020/1040 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 928.53 Sect/Pc #: 3/ ROCK = APHYRIC BASALT SOURCE IS IR; Texture: APHYRIC,DIABASIC-INTERSERTAL* Groundmass - GROUNDMASS ( 94.5%) Size(mm): <.3 IN REFLECTED LIGHT IS SIMILAR TO 33-3-94-96 BUT FINER GRAINED* SAME AS 33-3-91-93 BUT CONTAINS CONSIDERABLY LESS ALTERED GROUNDMASS GLASS,AND IS FINER GRAINED* Vesicles - Size(mm): .5-1.5 Percent: 5.5 AVERAGE SIZE .8MM.SAME AS 33-3-91-93 BUT CONTAINS LESS VESICLES* Leg : 33 Top/Bottom Interval(mm): 1100/1140 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: SEDIMENTARY Core: 33 Sample Midpoint(m) : 928.62 Sect/Pc #: 3/ ROCK = SILTSTONE; SOURCE IS IR; Texture: HORNFELS COHERENT,PARTIALLY BAKED SILTSTONE WITH INCIPIENT HORNFELS TEXTURE* Groundmass - COMBINATION X-RAY MINERALOGY(IN ORDER OF ABUNDANCE):PLAG,PYX, HEULANDITE,MONTMORILLONITE,QUARTZ,CELADONITE,AND PYRITE* Leg : 33 Top/Bottom Interval(mm): 1240/1280 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: SEDIMENTARY Core: 33 Sample Midpoint(m) : 928.76 Sect/Pc #: 3/ ROCK = SILTSTONE COHERENT,PARTIALLY BAKED,SOURCE IS IR* X-RAY MINERALOGY(IN ORDER OF DECREASING ABUNDANCE):PLAG,PYX,CELADONITE,MONTMORILLONITE, QUARTZ,AND PYRITE* Leg : 33 Top/Bottom Interval(mm): 1300/1320 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: SEDIMENTARY Core: 33 Sample Midpoint(m) : 928.81 Sect/Pc #: 3/ ROCK = SILTSTONE COHERENT,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 1410/1450 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: SEDIMENTARY Core: 33 Sample Midpoint(m) : 928.93 Sect/Pc #: 3/ ROCK = CLAYSTONE SOURCE IS IR* Groundmass - COMBINATION X-RAY MINERALOGY(IN ORDER OF DECREASING ABUNDANCE):MONTMORILLONITE,QUARTZ,PLAG,PYX,AND PYRITE* Leg : 33 Top/Bottom Interval(mm): 280/ 300 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: SEDIMENTARY Core: 33 Sample Midpoint(m) : 929.29 Sect/Pc #: 4/ ROCK = CLAYSTONE SOURCE IS IR* Groundmass - COMBINATION IN ORDER OF DECREASING ABUNDANCE:MONTMORILLONITE, CALCITE,PLAG,PYX,PYRITE,AND MAGNETITE* Leg : 33 Top/Bottom Interval(mm): 1000/1020 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 930.01 Sect/Pc #: 4/ ROCK = APHYRIC BASALT HEAVILY ALTERED,SOURCE IS IR; Texture: APHYRIC,INTERGRANULAR-INTERSERTAL* Groundmass - GROUNDMASS ( 95%) Size(mm): <.3 PYROXENE AUGITE AND CA-POOR AUGITE,PARTLY ALTERED TO MONTMORILLONITE; PLAGIOCLASE PARTLY ALTERED TO MONTMORILLONITE; GLASS FORMER INTERSERTAL GLASS ENTIRELY ALTERED TO MONTMORILLONITE,NO NEPHELINE OR K-FELDSPAR* Alteration - CALCITE ( 0%) MONTMORILLONITE Location: VESICLES,VEIN Replacing: GLASS+PYX+PLAG VEIN OF MONTMORILLONITE CUTS SECTION* Vesicles - Size(mm): .2-1.5 Percent: 5 Filling: MONT AVERAGE SIZE 1MM,GREEN MONT* Leg : 33 Top/Bottom Interval(mm): 1030/1050 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 930.04 Sect/Pc #: 4/ ROCK = APHYRIC BASALT SAME AS 33-4-100-102 EXCEPT IN REFLECTED LIGHT MAGNETITE IS SCATTERED EVENLY THROUGH THE ROCK, PARTIALLY ALTERED TO OPAQUE,NONREFLECTIVE MATERIAL SPARSE ILMENITE BLADES OCCUR IN AREAS OF FORMER INTERSERTAL GLASS,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 930.60 Sect/Pc #: CC/ ROCK = APHYRIC BASALT MODERATELY ALTERED,SOURCE IS IR; Texture: APHYRIC,INTERGRANULAR-INTERSERTAL* Groundmass - GROUNDMASS ( 95%) Size(mm): <.3 Alteration - CALCITE Location: VESICLES+ Location: PATCHES Vesicles - Size(mm): .6-1.8 Percent: 5 Filling: CALCITE AVERAGE SIZE 1MM,SAME AS 33-4-100-102 EXCEPT CALCITE OCCURS AS VESICLE FILLINGS AND REPLACEMENT PATCHES* Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 924.50 Rock Type: IGNEOUS Core: 33 Sample Midpoint(m) : 930.60 Sect/Pc #: CC/ ROCK = APHYRIC BASALT SOURCE IS SHIPBOARD DESCRIPTION* Texture: APHYRIC, INTERSERTAL,LOCALLY INTERGRANULAR CUT PERPENDICULAR TO CORE SHOWS CHILL EFFECTS TOWARD BASE,AT COARSE SIDE GROUNDMASS AVERAGES 0.25* Groundmass - PLAGIOCLASE ( 40%) Morphology: LATHS RANGE .01X.03 TO .4X1.0,AVG .03X.08,FIBROUS PLAG ALTERED TO PALAG TYPE MATERIAL-THIS MATERIAL ALSO ALSO FILLS CENTERS AT MANY "HOLLOW" PLAG LATHS; AUGITE ( 34%) Size(mm): 0.4X0.5 Morphology: GRAINS INTERGROWN AT EDGES WITH PLAG,INTERSERTAL GLASS IN TRIANGULAR AREAS,AT FINE END OF SECTION AUGITE IS 35%; OPAQUE MINERALS ( <5%) CONCENTRATED NEAR GLASS* Alteration - ZEOLITE Location: VESICLES CALCITE Location: VESICLES,VEIN Replacing: S CALCITE VEINS IN HAND SPECIMEN ONLY; PALAGONITE Replacing: PLAG Vesicles - Size(mm): 0.6-1.75 Filling: CALCITE,ZEOL Shape: FLATTENED VESICULAR,IRREGULAR & VUGGY NEAR TOP OF ROCK,MORE SPHERICAL TOWARD BASE,FLATTENED PERP. TO CORE, AVG SIZE TOP 1.3MM, BASE 0.5MM,PARTIALLY FILLED WITH DARK GREEN PARTIALLY FIBROUS-PARTLY GRANULAR MATERIAL, SMALL AMOUNT CALCITE & ZEOLITE FILLING, CALCITE LOOKS YOUNGER, VESICLES 11% AT COARSE END,VESICLES 5% AT FINE END,ABOUT HALF Size(mm): FILLED* Leg : 33 Top/Bottom Interval(mm): 340/ 360 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 934.35 Sect/Pc #: 1/ ROCK = APHYRIC BASALT MODERATELY ALTERED,SOURCE IS IR; Texture: APHYRIC,INTERGRANULAR-INTERSERTAL* Groundmass - GROUNDMASS ( 88.5%) Size(mm): <.3 PYROXENE AUGITE AND CA-POOR AUGITE,FRESH; PLAGIOCLASE FRESH; GLASS FORMER INTERSERTAL GLASS ALTERED TO BROWN MONTMORILLONITE,NO NEPHELINE OR K-FELDSPAR* Alteration - MONTMORILLONITE Location: VESICLES Replacing: GLASS CALCITE Location: VESICLES Vesicles - Size(mm): .5-1.5 Percent: 11 Filling: MONT+CALCITE AVERAGE SIZE 1MM,PARTIALLY FILLED WITH GREEN MONTMORILLONITE,SOME VESICLE CENTERS CONTAIN CALCITE* Leg : 33 Top/Bottom Interval(mm): 400/ 410 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 934.41 Sect/Pc #: 1/ ROCK = APHYRIC BASALT SAME AS 34-1-34-36 PLUS IN REFLECTED LIGHT IDENTICAL TO 33-4-103-105 EXCEPT THAT A FEW SCATTERED CHALCOPYRITE BLEBS WERE OBSERVED,SOME INTERGROWN WITH PYRRHOTITE,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 840/ 860 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 936.35 Sect/Pc #: 2/ ROCK = PLAG-PYX SPARSELY GLOMEROPHYRIC BASALT MODERATELY ALTERED,SOURCE IS IR; Texture: SPARSELY GLOMEROPHYRIC,INTERSERTAL-DIABASIC* Phenocrysts- COMBINATION ( 2%) Size(mm): 1.5 GLOMEROPHYRIC CLOTS OF PLAG+PYX,CLOTS FRESH* Groundmass - PYROXENE AUGITE AND CA-POOR AUGITE,FRESH; PLAGIOCLASE FRESH; GLASS FORMER INTERSERTAL GLASS ALTERED TO BROWN MONTMORILLONITE,NO NEPHELINE OR K-FELDSPAR OBSERVED* Alteration - CALCITE ( 0%) MONTMORILLONITE Location: VESICLES Replacing: GLASS Vesicles - Size(mm): .5-7 Percent: 19 Filling: MONT AVERAGE SIZE 2.5MM,VESICLES RANGE TO VERY LARGE SIZES,SMALLER FILLED WITH GREEN MONTMORILLONITE, LARGER HAVE ONLY THIN RIMS,PALE GREEN CELADONITE COATS SOME LARGER WALLS* Leg : 33 Top/Bottom Interval(mm): 910/ 930 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 936.42 Sect/Pc #: 2/ ROCK = PLAG-PYX SPARSELY GLOMEROPHYRIC BASALT SAME AS 34-2-84-86,IN REFLECTED LIGHT MAGNETITE IS SCATTERED EVENLY THROUGHOUT THE ROCK,PARTIALLY REPLACED BY AN OPAQUE,NONREFLECTIVE MATERIAL, SPARSE ILMENITE OCCURS AS BLOCKY GRAINS AND LATHS, SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 1150/1170 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 936.66 Sect/Pc #: 2/ ROCK = APHYRIC BASALT MODERATELY ALTERED,SOURCE IS IR,FRESH GROUNDMASS; Texture: APHYRIC,VITROPHYRIC* Groundmass - GROUNDMASS ( 73.5%) Size(mm): <.05 PYROXENE Morphology: MICROLITES AUGITE AND CA-POOR AUGITE,FRESH; PLAGIOCLASE GLASS FORMER GROUNDMASS GLASS(APPROX 50% OF NON- VESICULAR PART OF ROCK)IS COMPLETELY ALTERED TO BROWN MONTMORILLONITE,NO K-FELDSPAR* Alteration - CALCITE SMALL AMOUNTS OBSERVED; OTHER SOME GREENISH CELADONITE REPLACING GROUNDMASS* Vesicles - Size(mm): .5-10 Percent: 26.5 AVERAGE SIZE 5MM,HUGE VESICLES ARE LARGELY OPEN WITH THIN RIMS OF GREEN MONTMORILLONITE,HEULANDITE IDENTIFIED IN VESICLE FILLINGS BY X-RAY DIFFRACT.* Leg : 33 Top/Bottom Interval(mm): 1180/1200 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 938.19 Sect/Pc #: 3/ ROCK = APHYRIC BASALT SAME AS 34-3-115-117 EXCEPT IN REFLECTED LIGHT TINY XTLS OF MAGNETITE ARE SCATTERED EVENLY THROUGH ROCK,PARTIALLY ALTERED TO AN OPAQUE NONREFLECTIVE SUBSTANCE,A FEW ILMENITE LATHS AND MINUTE CHALCOPYRITE BLEBS ARE PRESENT,NO NEPHELINE PRESENT,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 620/ 640 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 939.13 Sect/Pc #: 4/ ROCK = PYX-PLAG MODERATELY GLOMEROPHYRIC BASALT SOURCE IS IR; Texture: MODERATELY GLOMEROPHYRIC,VITROPHYRIC* Phenocrysts- COMBINATION ( 8%) Size(mm): 1.6 GLOMEROPHYRIC CLOTS OF PYX+PLAG* Groundmass - GROUNDMASS ( 73.5%) Size(mm): <.05 SAME AS 34-3-115-117 EXCEPT FOR PRESENCE OF UNALTERED CLOTS AND THE PRESENCE OF SOMEWHAT MORE CALCITE* Vesicles - Size(mm): 2-8 Percent: 18.5 AVERAGE SIZE 5MM* Leg : 33 Top/Bottom Interval(mm): 650/ 670 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 939.16 Sect/Pc #: 4/ ROCK = PYX-PLAG MODERATELY GLOMEROPHYRIC BASALT SAME AS 34-4-62-64 AND IN REFLECTED LIGHT SAME AS 34-3-118-120,SOURCE IS IR* Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 940.10 Sect/Pc #: CC/ ROCK = PYX-PLAG GLOMEROPHYRIC BASALT SOURCE IS IR; Texture: GLOMEROPHYRIC,VITROPHYRIC* Groundmass - GROUNDMASS ( 76%) Size(mm): <.05 Vesicles - Size(mm): 2-10 Percent: 7 AVERAGE SIZE 5MM,SAME AS 34-4-62-64 EXCEPT CONTAINS MORE CLOTS AND LESS VESICLES* Leg : 33 Top/Bottom Interval(mm): 0/ 0 Describer: Jackson, E.D. Hole: 317A Top of Core Depth(m) : 934.00 Rock Type: IGNEOUS Core: 34 Sample Midpoint(m) : 940.10 Sect/Pc #: CC/ ROCK = PLAG-CPX GLOMEROPHYRIC BASALT SOURCE IS SHIPBOARD DESCRIPTION,ROCK SAMPLE SHOWS 1-2% YELLOW ALTERED WELL SHAPED .5MM AREAS WHICH MAY BE FORMER OL MICROPHENOS,NONE IN SECTION, ALSO SHOWS PURE ZEOL VESICLE FILLINGS-AGAIN NOT OBSERVED IN SECTION; Texture: MICROPHYRIC, GLOMEROPHYRIC,VERY FINE INTERGRANULAR GROUNDMASS* Phenocrysts- PLAGIOCLASE ( 7.5%) Size(mm): 0.2X0.5 Morphology: SERIATE SIZE RANGES TO 0.6X1.2MM,AVG SIZE ABOUT 0.4X0.8MM, SOME SERIATE,BUT NOT EVENLY DISPERSED IN SIZE, MAY BE SEVERAL GENERATIONS; PLAGIOCLASE ( 6%) PLAG-RICH GLOMERPHYRIC CLOTS,5-10 GRAINS PRESENT, RANGE FROM .25X.4 TO 1.8X1.8MM, AVG 1.2X1.2MM, INDIVIDUAL PLAG ARE 0.1X0.5 ON THE AVERAGE, ABOUT 5% PYX IS INTERGROWN; CLINOPYROXENE ( 3.5%) PYX-RICH GLOMERPHYRIC CLOTS,5-10 GRAINS PRESENT, RANGE IN SIZE FROM .25X.4 TO .8X1.25MM,AVG .5X.7, INDIVIDUAL CPX AVG 0.2-0.3MM, ARE INTERGROWN WITH ABOUT 5% PLAG* Groundmass - PLAGIOCLASE ( 35%) Size(mm): <.05 CLINOPYROXENE ( 35%) Size(mm): <.05 PIGEONITE ( 0%) GLASS ( 3%) ONLY PARTLY ALTERED, SOME STILL BROWN; OPAQUE MINERALS ( <5%) Alteration - CALCITE ( 0%) ZEOLITE Location: VESICLES Vesicles - Percent: 7 Filling: ZEOL,OTHER Shape: IRREGULAR, Shape: VUGGY, Shape: ROUNDED GENERALLY ELONGATE PERPENDICULAR TO CORE,FILLED WITH FIBROUS TO GRANULAR BLUE-GREEN MATERIAL,MOST HAVE BROWN .05MM RIMS,A FEW CONTAIN SMALL AMOUNTS OF ZEOL,ROCK IS VESICULAR* |
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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