Leg : 17 Top/Bottom Interval(mm): 210/ 240 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 181.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 181.22 Sect/Pc #: 1/
ROCK = PLAG-OL PHYRIC BASALT
DIABASE OR COARSE-GRAINED BASALT,SOURCE IS IR,
SEE PP. 486-487;
Texture: PHYRIC,(PHYRIC,FINE-GRAINED,INTERGRANULAR
DIABASE) OR COARSE-GRAINED BASALT*
Phenocrysts- PLAGIOCLASE ( 4.25%)
Size(mm): 1.10X0.16
FRESH REMNANTS,CORES OF PLAG ALTERED TO
KSPAR PLUS MINOR PHILLIPSITE, PROBABLY OF
DIAGENETIC ORIGIN;
OLIVINE ( 1.83%)
Size(mm): 0.7X0.5 Morphology: PSEUDOMORPHS
Groundmass - PLAGIOCLASE (17.16%)
FRESH REMNANTS,CORES OF LARGER PLAG ALTERED TO
KSPAR-BUT MUCH OF WHICH MAY BE PHILLIPSITE;
PYROXENE (16.36%)
Size(mm): 0.05X0.05
DIMENSIONS 0.15X0.15MM AT COARSER END OF SECTION;
OPAQUE MINERALS ( 6.24%)
Size(mm): 0.09X0.08
OTHER ( 0.09%)
Size(mm): 1.55X0.15
OPAQUE LENS;
OTHER ( TR%)
OPAQUE INCLUSIONS IN OLIVINE,MODAL ANALYSIS*
Alteration - KFELDSPAR ( 9.82%)
Replacing: PLAG PHENOS
KFELDSPAR ( 2.05%)
Replacing: PLAG GROUNDMASS
ID UNCERTAIN FOR KSPAR,MAY INCLUDE PHILLIPSITE;
APATITE ( TR%)
PHILLIPSITE ( 0.12%)
Location: PATCHES
PATCHES (0.3X0.35/0.7X0.6),INDIVIDUAL XTLS
(0.09X0.05/0.45X0.25)
OTHER (19.11%)
RED BROWN INTERSERTAL MASS;
CHLORITE (22.97%)
Replacing: PYX
CALCITE ( 0.03%)
(0.1X0.03/0.5X0.4);
OTHER ( TR%)
Replacing: PYX
MAY BE PYX ALTERED AND OXIDIZED TO MONT*
Leg : 17 Top/Bottom Interval(mm): 1220/1240 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 181.00 Rock Type: IGNEOUS
Core: 5 Sample Midpoint(m) : 182.23 Sect/Pc #: 1/
ROCK = APHYRIC DIABASE
SOURCE IS IR,SEE P. 487;
Texture: FINE-GRAINED,INTERGRANULAR TO SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 51.5%)
Size(mm): 1.0X0.27
PYROXENE ( 25.0%)
Size(mm): 0.9
OLIVINE ( 12.0%)
Size(mm): 0.7X0.55 Morphology: GRANULAR TO INTERGRANULAR
MINOR FRESH REMNANTS SURVIVE;
OPAQUE MINERALS ( 2.5%)
Size(mm): 0.21X0.2
MODAL ANALYSIS*
Alteration - KFELDSPAR ( 0%)
COMBINATION ( 8.6%)
INCLUDES MONT + CHLORITE,INTERSERTAL MINERALS OF
VARIED COLORS AND TEXTURES;
PHILLIPSITE ( 0.1%)
INTERSTITIAL AGGREGATES IN SOME CASES ASSOCIATED
(ERSER%)
Location: TAL CHLORITE Replacing: AND MONT;
CHLORITE ( 0.4%)
Location: INTERSTITIAL
SIZE IS 0.4MM MAX*
Leg : 17 Top/Bottom Interval(mm): 190/ 200 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 190.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 191.70 Sect/Pc #: 2/
ROCK = APHYRIC DIABASE
SOURCE IS IR, SEE P.487;
Texture: MEDIUM-GRAINED,APHYRIC,SUBOPHITIC*
Groundmass - PLAGIOCLASE ( 41.0%)
Size(mm): 1.2X0.2
VOLUME IS 9.8% IN ZEOLITE-RICH AREA,SEAMED BY
PHILLIPSITE AND CHABAZITE ALONG CRACKS AND
EXTENSIVELY TO WHOLLY REPLACED NEAR A LARGE PATCH
OF INTERSTITIAL PHILLIPSITE;
PYROXENE ( 28.8%)
Size(mm): 2.0X1.7
VOLUME IS 16.3% IN ZEOLITE-RICH AREA;
OLIVINE ( 10.2%)
Size(mm): 1.3X0.5 Morphology: GRANULAR TO INTERGRANULAR
VOLUME IS 10.2% IN ZEOLITE-RICH AREA,FRESH AND
ALTERED;
OPAQUE MINERALS ( 4.2%)
Size(mm): 0.3X0.3
VOLUME IS 2.3% IN ZEOLITE-RICH AREA,MODAL
ANALYSIS*
Alteration - COMBINATION ( 5.7%)
INCLUDES CHLORITE+MONT,VOLUME IS 9.6 IN ZEOLITE-
RICH AREA;
PHILLIPSITE ( 1.0%)
Location: INTERSTITIAL
VOLUME IS 12.9% IN ZEOLITE-RICH AREA,PHILLIPS-RICH
AREAS CONTAIN MUCH BROWN AND GREEN MONT + CHLORITE
AND RARE PYRITE CUBES;
APATITE ( 0.2%)
IN ZEOLITE-RICH AREA;
MICA ( 0.3%)
ID UNCERTAIN,VOLUME IS 0.5 IN ZEOLITE-RICH AREA;
PYRITE ( TR%)
RARE GRAINS IN PHILLIPSITE-RICH AREAS AND IN MAIN
DIABASE*
Leg : 17 Top/Bottom Interval(mm): 330/ 380 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 190.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 193.36 Sect/Pc #: 3/
ROCK = OLIVINE DIABASE
SOURCE IS IR,SEE P.488;
Texture: MEDIUM- TO COARSE-GRAINED,OPHITIC TO
INTERGRANULAR*
Groundmass - PLAGIOCLASE (51.02%)
Size(mm): 1.18X0.22
ALMOST WHOLLY FRESH;
PYROXENE (24.78%)
OPTICALLY CONTINUOUS OVER LARGE AREAS,FRESH
EXCEPT POSSIBLY FOR LATE PERIPHERAL DEUTERIC
ALTERATION TO AMPHIBOLE,OPAQUE INCLUSIONS OCCUR
OF GRAINS BUT NOT THEIR CORES;
OLIVINE ( 5.19%)
Size(mm): 0.45X0.30
FRESH;
TITANOMAGNETITE ( 3.15%)
Size(mm): 0.32X0.26 Morphology: EUHEDRAL
OCCUR IN PLAG+OL+OUTER PARTS OF PYX,MODAL
ANALYSIS*
Alteration - MONTMORILLONITE ( 4.97%)
Replacing: OL
AMPHIBOLE ( 0.21%)
CHLORITE ( 6.25%)
Location: INTERSTITIAL
APATITE ( 0.09%)
TINY PRISMS IN PLAG+PHILLIPSITE+MONT OR CHLORITE
ASSOCIATED WITH PHILLIPSITE;
BIOTITE ( 0.06%)
ID UNCERTAIN FOR BIOTITE,BROWN PLEOCHROIC FLAKES
ADJACENT TO OPAQUE GRAINS;
ZEOLITE ( 0.36%)
Replacing: PLAG
MONTMORILLONITE ( 2.40%)
LATE,GREEN;
MONTMORILLONITE ( 0.03%)
LATE,BROWN;
CALCITE ( 0.03%)
RARE PATCHES IN THE BLUE-GREEN CHLORITE ASSOCIATED
WITH OLIVINE*
Leg : 17 Top/Bottom Interval(mm): 880/ 920 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 190.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 195.40 Sect/Pc #: 4/
ROCK = MEDIUM-GRAINED OL DIABASE
SOURCE IS IR,SEE P. 488;
Texture: MEDIUM-GRAINED*
Groundmass - PLAGIOCLASE
FRESH EXCEPT FOR MINOR PHILLIPSITE ALONG CRACKS;
CLINOPYROXENE
ILMENITE
ID UNCERTAIN FOR ILMENITE;
OLIVINE
MODERATELY ALTERED*
Alteration - CHLORITE
CHABAZITE ( TR%)
Replacing: PLAG
MONTMORILLONITE
Replacing: OL
BOWLINGITE
Replacing: OL
PHILLIPSITE
Replacing: PLAG
INTERSTITIAL PHILLIPS VERY RARE;
APATITE
TINY PRISMS PRESENT IN PLAG AND PHILLIPSITE*
Leg : 17 Top/Bottom Interval(mm): 1400/1410 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 190.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 195.91 Sect/Pc #: 4/
ROCK = DIABASE
SOURCE IS IR,SEE P. 488;
Texture: FINE- TO MEDIUM-GRAINED DIABASE*
Groundmass - OLIVINE
RELATIVELY LITTLE SURVIVES ALT TO BROWN MONT;
PLAGIOCLASE
PROMINANTLY ALTERED TO ZEOLITES ALONG NUMEROUS
CRACKS;
TITANOMAGNETITE
Alteration - MONTMORILLONITE
Replacing: OL
ZEOLITE
Location: ALONG CRACKS Replacing: PLAG
INTERSTITIAL ZEOLITE PRESENT BUT NO LARGE PATCHES;
KFELDSPAR ( 0%)
Leg : 17 Top/Bottom Interval(mm): 1410/1440 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 190.00 Rock Type: IGNEOUS
Core: 6 Sample Midpoint(m) : 197.43 Sect/Pc #: 5/
ROCK = PLAG-OL-PYX PHYRIC BASALT
SOURCE IS IR,P.488;
Texture: CHILLED PORPHYRITIC BASE OF SILL*
Phenocrysts- PLAGIOCLASE
MICROPHENOS,GLOMEROCRYSTS;
CLINOPYROXENE
MICROPHENOS;
OLIVINE
MICROPHENOS*
Groundmass - PLAGIOCLASE
Morphology: SKELETAL
LATER,FORKED END;
GROUNDMASS
MAINLY GREEN CHLORITE+MONT IN WHICH THEY ARE SET,
REMNANTS OF VERY FINE-GRAINED FEATHERY PYX
VARIOLES;
TITANOMAGNETITE
MAGNETITE
Alteration - KFELDSPAR
Replacing: PLAG
CHLORITE
MONTMORILLONITE
AMPHIBOLE
MINOR;
CALCITE
Location: PSEUDOMORPHS Replacing: OL,PYX
Vesicles -
Percent: 0
Leg : 17 Top/Bottom Interval(mm): / Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 233.00 Rock Type: IGNEOUS
Core: 11 Sample Midpoint(m) : 234.60 Sect/Pc #: CC/
ROCK = PLAG-CPX-OL PHYRIC BASALT
SOURCE IS IR,SEE P.489;
Texture: PORPHYRITIC,GLOMEROPORPHYRITIC,DENSELY CHILLED
GROUNDMASS*
Phenocrysts- PLAGIOCLASE ( 0.1%)
KSPAR NOT SEEN IN THIN-SECTION BUT DETECTED IN
X-RAY ANALYSIS;
PLAGIOCLASE ( 9.6%)
Size(mm): 0.15X0.04
MICROPHENOS ,ALWAYS GLOMERATIC;
OLIVINE ( 0.1%)
WHOLLY ALTERED TO GREN RARELY DEEP RED FLAKY
MINERAL;
PYROXENE ( 7.9%)
Size(mm): 0.13X0.12 Morphology: GLOMERATIC
OLIVINE ( 1.5%)
Size(mm): 0.2X0.16
Groundmass - PLAGIOCLASE ( 13.5%)
Size(mm): 0.2X0.02
PYROXENE ( 49.5%)
Size(mm): 0.04X0.04 Morphology: GRAINS
OPTICALLY PARALLEL UNITS IN FEATHERY VARIOLES
(0.05/>0.1);
OPAQUE MINERALS ( 5.2%)
Size(mm): 0.018X.018 Morphology: ELONGATE,EQUANT
MODAL ANALYSIS*
Alteration - KFELDSPAR
ENCLOSED IN PLAG;
IDDINGSITE
Replacing: OL
ID UNCERTAIN;
CELADONITE
Replacing: OL
ID UNCERTAIN;
MONTMORILLONITE ( 12.4%)
CALCITE ( 0.2%)
Replacing: PYX
ONE ANHEDRAL PATCH THAT MAY BE PYX PSEUDOMORPH*
Leg : 17 Top/Bottom Interval(mm): 310/ 320 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 238.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 238.82 Sect/Pc #: 1/
ROCK = PLAG-PYX-OL MICROPHYRIC BASALT
SOURCE IS IR,SEE P.489,RELATIVELY FRESH;
Texture: PHYRIC,GLOMEROPORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 13.0%)
Size(mm): 0.25X0.03
PYROXENE ( 23.7%)
Size(mm): 0.12X0.10 Morphology: EUHEDRAL
GLOMEROCRYSTS OF PYX+PLAG+OL FORMED AROUND FIRST
EUHEDRAL PYX;
OLIVINE ( 2.0%)
Size(mm): 0.18X0.12 Morphology: PSEUDOMORPHS
Groundmass - PLAGIOCLASE ( 5.8%)
PYROXENE ( 41.0%)
Morphology: VARIOLES
OPAQUE MINERALS ( 5.6%)
MODAL ANALYSIS*
Alteration - MONTMORILLONITE ( 8.7%)
Location: GROUNDMASS
CALCITE ( 0.04%)
MONTMORILLONITE
Replacing: PLAG
PLAG PHENOS WHOLLY ALTERED TO MONT AND A TRACE OF
CALCITE;
KFELDSPAR
TRACE SEEN IN PLAG PHENOS*
Leg : 17 Top/Bottom Interval(mm): 00/ 20 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 238.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 240.01 Sect/Pc #: 2/
ROCK = BASALT
SOURCE IS IR,SEE P.490;
Texture: "GLASSY SELVAGE WHICH DIPS ABOUT 45 DEGREES; IT
MAY BE THE EDGE OF A PILLOW.MOST OF THE GLASS,
ESPECIALLY THE OUTER PART,IS ALTERED TO GREEN AND
LESS GRAYISH BROWN,SOFT,RESINOUS MONTMORILLONITIC
MATERIAL.FRESH SIDEROMELANE SURVIVES MAINLY IN THE
INNER PART OF THE SELVAGE,AND AS RARE PATCHES IN THE
OUTER PART...THE GLASS GRADES THROUGH SIDEROMELANE
Where sampled: H ISOLATED SPHERULITES TO A DENSE LAYER OF
SPHERULITES."*
Groundmass - GLASS
"THE SPHERULITIC LAYER ALSO CONTAINS PATCHES OF
LIGHT BOTTLE GREEN,SOFT,TRANSPARENT,HIGHLY CRACKED
MATERIAL;THE PATCHES APPARENTLY ARE NOT AMYGDULES;
THEY RESEMBLE PSEUDOMORPHS AFTER OL EXCEPT IN
LACKING IDENTIFIABLE MONT..MOST LIKELY THEY ARE
ALTERATION PRODUCTS OF INTERSTITIAL GLASS IN THE
SPHERULITE LAYER THAT HAD FAILED TO DEVITRIFY."*
Alteration - PALAGONITE
RELICT;
PHILLIPSITE
Location: VEINS
CALCITE
Location: VEINS
Leg : 17 Top/Bottom Interval(mm): 1150/1170 Describer: Bass, M.
Hole: 169 Top of Core Depth(m) : 238.50 Rock Type: IGNEOUS
Core: 12 Sample Midpoint(m) : 241.16 Sect/Pc #: 2/
ROCK = BASALT
SOURCE IS IR,SEE P.490;
Texture: "..DENSELY CHILLED BASALT THAT GRADES FROM A
GLASSY SELVAGE,THROUGH A ZONE OF GLASS WITH ISOLATED
GRAY SPHERULITES,TO A CONTINUOUS LAYER OF
SPHERULITES WITH INTERSTITIAL BROWN ALTERED GLASS,
GRAY MICROXLN BASALT.TAPERING PROJECTIONS OF GLASS
EXTEND FROM THE SELVAGE INTO THE SPHERULITIC
LAYER."*
Phenocrysts- OLIVINE
OCCURRED ORIGINALLY AS LARGE ISOLATED PHENOCRYSTS
AND IN GLOMEROCRYSTS,COMPLETELY ALTERED*
Groundmass - GLASS
"THE ALTERED INTERSTITIAL GLASS IN THE SPHERULITIC
LAYER IS BROWN.THE SPHERULITIC LAYER ALSO CONTAINS
TINY,IRREGULAR PATCHES OF TRANSPARENT HIGHLY
CRACKED,LIGHT BOTTLE GREEN MATERIAL,SIMILAR TO
THAT IN 17-169-12-2,0-2CM.THIS MATERIAL MAY BE
PSEUDOMORPHS AFTER OL MICROPHENOS OR ALTERED
INTERSTITIAL GLASS.";
PLAGIOCLASE
Morphology: MICROCRYSTALLINE
PYROXENE
Morphology: MICROCRYSTALLINE
GROUNDMASS COMPOSED MAINLY OF EXTREMELY FINE-
GRAINED,RED-BROWN,SUBRADIAL,IN PLACES FEATHERY,
VARIOLES,ALSO INCLUDES DISTINCT PLAG+PYX GRAINS;
MICROCRYST GROUNDMASS
INCLUDES PYX+PLAG+OL,OL IS ALTERED,PYX RELATIVELY
ABUNDANT,COLORLESS,IN SOME CASES COARSE AND
OPHITIC AND IN SOME CASES TWINNED.GLOMEROCRYSTS
SMALLER AND LESS ABUNDANT THAN IN SAMPLES TAKEN
HIGHER IN CORE,NOT SERIATE WITH BUT STRONGLY
CONTRASTED WITH GROUNDMASS;
OPAQUE MINERALS
Morphology: EQUANT,ANHEDRAL
OCCURS UNCOMMONLY AS SLIGHTLY ELONGATE GRAINS*
Alteration - PHILLIPSITE
Location: VEINS
CELADONITE
Location: VEIN
CALCITE
MONTMORILLONITE
Replacing: OL
PALAGONITE
|
