Leg : 37 Top/Bottom Interval(mm): 200/ 0 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 253.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 254.70 Sect/Pc #: 2/
ROCK = PLAG-CPX-OL BASALT
SOURCE IS IR;
Texture: PORPHYRITIC,GRAIN SIZE PHENOS <3MM,
SIZE GROUNDMASS MINERALS <1MM, MODAL PERCENTAGES
FOR TOTAL GROUNDMASS AND PHENOS*
Groundmass - PLAGIOCLASE ( 50%)
CLINOPYROXENE ( 45%)
OLIVINE ( 5%)
Vesicles -
Filling: CHLORITE
MINOR CHLORITE*
Leg : 37 Top/Bottom Interval(mm): 300/ 0 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 253.00 Rock Type: IGNEOUS
Core: 15 Sample Midpoint(m) : 254.80 Sect/Pc #: 2/PCE 4
ROCK = PLAGIOCLASE SPARSELY PHYRIC BASALT
PHENOS OF PLAG + OL + CPX SET IN A CRYPTXLN
QUENCHED MATRIX SHOWING INCIPIENT CRYSTALLIZATION;
Texture: SPARSELY PHYRIC,APHANITIC-CRYPTXLN
VERY FINE-GRAINED GROUNDMASS*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 1.0-5.0 Morphology: SKELETAL,SUBHEDRAL
PHENOS ARE SOMEWHAT CORRODED WITH SOME GLASSY
INCLUSIONS,SEEN AS EITHER SEPARATE XTALS OR WITH
CPX OR RARE OL;
OLIVINE ( 2-3%)
Size(mm): 0.1-0.3
SOMETIMES WITH PLAG,2V OF 90;
CLINOPYROXENE ( <1%)
2VZ OF 45,SOMETIMES WITH PLAG,FRESH*
Groundmass - OLIVINE
PLAGIOCLASE
PYROXENE
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: GROUNDMASS,GLASS
Location: VESICLES
YELLOW,IN NARROW ZONE AT ONE END OF SLIDE;
IDDINGSITE ( TR%)
Replacing: OL
TRACE ON ONE OL*
Vesicles -
Size(mm): 0.3-0.8
Percent: 1-2
Filling: CARB,SMEC
Leg : 37 Top/Bottom Interval(mm): 220/ 250 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 262.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 262.74 Sect/Pc #: 1/PCE 2
ROCK = PLAGIOCLASE MODERATELY PHYRIC BASALT
POORLY CRYSTALLIZED GROUNDMASS WITH SKELETAL PLAG
LATHS IN A MATRIX OF SHEAF-LIKE CPX WITH
INTERSTITIAL GLASS + FE.OXIDES;
Texture: MODERATELY PHYRIC,VARIOLITIC,APHANITIC-CRYPTXLN
ONLY SLIGHTLY VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( >5%)
Size(mm): TO 5.0 Morphology: SUBHEDRAL,PRISMS
FRESH,SLIGHTLY ZONED WITH SHARP MARGINAL RIM,
APPROX COMP AT LEAST AN70;
CLINOPYROXENE ( <1%)
RARE,FRESH,2VZ OF 50,MICROPHENOS;
OLIVINE ( <1%)
RARE,FRESH,MICROPHENOS*
Groundmass - PLAGIOCLASE
Size(mm): 0.3-0.5 Morphology: SKELETAL,LATHS
SKELETAL PLAG LATHS IN A SHEAF-LIKE MATRIX OF CPX
WITH INTERSTITIAL GLASS + FE.OXIDES;
OLIVINE
Size(mm): 0.1-0.3 Morphology: LATHS,SKELETAL
LATHS AND XTLS OF OL MOSTLY FRESH,SOME ALTERATION
TO IDDINGS,SOME CORRODED AND SKELETAL,2VZ OF 88;
CLINOPYROXENE
Morphology: SHEAF-LIKE
GLASS
INTERSTITIAL,SOME GLASS REPLACED BY YELLOW SMEC
ESPECIALLY NEAR VEINLETS;
OPAQUE MINERALS
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: GLASS
Location: VESICLES
SOME GLASS REPLACED BY YELLOW SMEC ESPECIALLY NEAR
VEINLETS;
IDDINGSITE
Replacing: OL
OL MOSTLY FRESH BUT SOME CORRODED AND SOME ALTERED
TO IDDINGS;
CARBONATE
ZEOLITE
Location: VEIN
PRISMATIC ZEOLITE XTLS GROWING FROM VEIN WALL;
LIMONITE
Vesicles -
Size(mm): 0.3-0.4
Percent: 1
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 1100/1130 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 262.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 263.62 Sect/Pc #: 1/PCE 10
ROCK = PLAG SPARSELY PHYRIC BASALT
MUCH LIKE PCE 2 OF THIS SECTION;
Texture: SPARSELY PORPHYRITIC*
Phenocrysts- PLAGIOCLASE
Size(mm): 1
SPARSE PLAG PHENOS (1 MM MAX) IN POORLY
CRYSTALLIZED MATRIX OF PLAG + CPX + SPARSE OL +
INTERSTITIAL BROWN GLASS + OP.MINS;
OLIVINE
SPARSE MICROPHENOS,CORRODED AND EMBAYED;
CLINOPYROXENE
SPARSE MICROPHENOS*
Groundmass - PLAGIOCLASE
IN POORLY CRYSTALLIZED MATRIX WITH CPX + SPARSE OL
+ INTERSTITIAL BROWN GLASS + OP.MINS;
CLINOPYROXENE
IN POORLY CRYSTALLIZED MATRIX WITH PLAG + SPARSE
OL + INTERSTITIAL BROWN GLASS + OP.MINS;
OLIVINE
SPARSE,IN POORLY CRYSTALLIZED MATRIX WITH PLAG +
CPX + INTERSTITIAL BROWN GLASS + OP.MINS;
GLASS
INTERSTITIAL,BROWN,IN POORLY CRYSTALLIZED MATRIX
WITH PLAG + CPX + SPARSE OL + OP.MINS;
OPAQUE MINERALS
IN POORLY CRYSTALLIZED MATRIX WITH PLAG + CPX +
SPARSE OL + INTERSTITIAL BROWN GLASS*
Alteration - SMECTITE
Location: INTERSTITIAL,
Location: VESICLES
ALTERATION IN NARROW ZONE--CHIEFLY YELLOW SMEC IN
VESICLES AND AFTER INTERSTITIAL MATERIAL*
Vesicles -
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 1090/1120 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 262.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 265.11 Sect/Pc #: 2/PCE 12A
ROCK = PLAG MODERATELY PHYRIC BASALT
SIMILAR TO THIN SECTIONS FROM SEC 1 BUT BETTER
CRYSTALLIZED AND MORE ALTERATION OF OL +
INTERSTITIAL MATERIAL;
Texture: MODERATELY PORPHYRITIC*
Phenocrysts- PLAGIOCLASE ( 1-5%)
FRESH,SHARP RIM*
Groundmass - OLIVINE
Size(mm): 0.1-1
ALTERED;
PLAGIOCLASE
Size(mm): 0.1-1
PYROXENE
Size(mm): 0.1-1
2VZ=45;
OPAQUE MINERALS
Size(mm): 0.1-1
INCLUDES MAGN + ILMENITE;
CRYPTOCRYSTALLINE
SMALL PATCHES APHANITIC-CRYPTOCRYSTALLINE*
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: OL
Location: VESICLES
BROWN SMEC AFTER OL? + INTERSTITIAL MATERIAL*
Vesicles -
Size(mm): 0.5-1
Percent: 1-2
Filling: SMEC
BROWN SMEC FILLING*
Leg : 37 Top/Bottom Interval(mm): 160/ 190 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 262.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 265.68 Sect/Pc #: 3/PCE 2A
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,SUBOPHITIC,INTERGRANULAR*
Phenocrysts- OLIVINE ( <1%)
Size(mm): 3
ONE XTL 3 MM LONG,ALTERED TO SMEC;
CLINOPYROXENE ( <1%)
MICROPHENOS,POORLY DEVELOPED,A FEW CLOTS WITH
PLAG,FRESH;
PLAGIOCLASE ( 1-5%)
Size(mm): 1-3 Morphology: SUBHEDRAL
APPROX COMP AT LEAST AN65 WITH SHARP SODIC RIMS,
CORRODED XTLS,FRESH*
Groundmass - OLIVINE ( 5%)
Size(mm): 0.2
ALL REPLACED BY BROWN SMEC;
CLINOPYROXENE
Size(mm): 0.1-1 Morphology: ANHEDRAL
2VZ=45,SECTOR ZONING PRESENT,FRESH;
PLAGIOCLASE
Size(mm): TO 0.5 Morphology: LATHS
OPAQUE MINERALS ( 2%)
Size(mm): 0.1-1
INCLUDES MAGN + ILMENITE,IRON OXIDES,ASSOCIATED
WITH SMALL AREAS OF GLASS NOW DEVITRIFIED AND
PARTLY REPLACED BY SMEC;
GLASS
SMALL AREAS NOW DEVITRIFIED AND PARTLY REPLACED
BY SMEC;
CRYPTOCRYSTALLINE
APHANITIC-CRYPTOCRYSTALLINE*
Alteration - SMECTITE
Location: VESICLES Replacing: OL
BROWN;
OTHER
WHITE,ISOTROPIC,HIGH NEGATIVE RELIEF;
TALC
IDENTITY UNCERTAIN*
Vesicles -
Size(mm): 0.5
Percent: <1
Filling: SMEC
A FEW VESICLES PARTLY FILLED WITH GLASSY MATERIAL
CONTAINING SMALL XTLS OF PLAG AND NEEDLES OF IRON
OXIDE*
Leg : 37 Top/Bottom Interval(mm): 70/ 100 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 262.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 267.09 Sect/Pc #: 4/PCE 1
ROCK = PLAG MODERATELY PHYRIC BASALT
GROUNDMASS POORLY CRYSTALLIZED,VERY FRESH EXCEPT
FOR OL;
Texture: MODERATELY PORPHYRITIC,VARIOLITIC,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( 1-5%)
Size(mm): 1-3
SLIGHTLY ZONED AND WITH A SHARP MARGINAL RIM,
FRESH*
Groundmass - PLAGIOCLASE
Size(mm): 0.2-0.7 Morphology: LATHS,SKELETAL,SHEAVES
SCATTERED,SOMEWHAT SKELETAL AND POORLY TERMINATED,
SMALL PLAG IN SHEAVES;
CLINOPYROXENE
Size(mm): TO 0.3 Morphology: SHEAVES
A FEW XTLS TO 0.3 MM IN CLUSTERS WITH PLAG;
OLIVINE ( 5%)
Size(mm): 0.1-0.3
SOMEWHAT CORRODED AND COMPLETELY REPLACED BY SMEC;
GLASS
SMALL GLASSY AREAS NOW DEVITRIFIED WITH TINY
OCTOHEDRA OF IRON OXIDES;
OPAQUE MINERAL
Morphology: OCTOHEDRA
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Replacing: OL
Vesicles -
Size(mm): 0.2-0.5
Percent: 1
Filling: EMPTY
Leg : 37 Top/Bottom Interval(mm): 1100/1130 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 262.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 268.12 Sect/Pc #: 4/PCE 7D
ROCK = APHYRIC BASALT
GROUNDMASS POORLY CRYSTALLIZED;
Texture: APHYRIC,VARIOLITIC,INTERGRANULAR,INTERSERTAL*
Groundmass - OLIVINE ( 5-10%)
Morphology: SKELETAL
SKELETAL PLAG LATHS AND SKELETAL OL IN MATRIX OF
SHEAF-LIKE CPX;
PLAGIOCLASE
Size(mm): 0.02-0.05 Morphology: LATHS,SKELETAL
SKELETAL PLAG LATHS AND SKELETAL OL IN MATRIX OF
SHEAF-LIKE CPX;
CLINOPYROXENE
Size(mm): TO 0.3 Morphology: SHEAF-LIKE
FORMS MATRIX,A FEW AREAS HAVE BETTER CRYSTALLIZED
CPX TO 0.3 MM ACROSS,2VZ=45;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL
TRACE OF IDDINGS OR BROWN SMEC OR SILICA AFTER OL
(GENERALLY FRESH) + INTERSTITIAL MATERIAL;
IDDINGSITE
Replacing: GLASS
TRACE OF IDDINGS OR BROWN SMEC OR SILICA AFTER OL
(GENERALLY FRESH) + INTERSTITIAL MATERIAL;
SILICA
Replacing: GLASS
TRACE OF IDDINGS OR BROWN SMEC OR SILICA AFTER OL
(GENERALLY FRESH) + INTERSTITIAL MATERIAL;
CARBONATE
Location: VESICLES
ZEOLITE
Location: VESICLES
IDENTITY QUESTIONABLE*
Vesicles -
Percent: TR
Filling: CARB,ZEOLITES
VERY RARE,ZEOLITES FILLING IS QUESTIONABLE*
Leg : 37 Top/Bottom Interval(mm): 190/ 210 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 262.50 Rock Type: IGNEOUS
Core: 16 Sample Midpoint(m) : 268.70 Sect/Pc #: 5/PCE 2A
ROCK = APHYRIC BASALT
SIMILAR TO 16-4 (110-113) EXCEPT BETTER
CRYSTALLIZED AND THE GROUNDMASS IS COARSER
GRAINED (0.1-1 MM);
Texture: APHYRIC,INTERGRANULAR*
Groundmass - OLIVINE ( 1-3%)
PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Location: VESICLES, Replacing: OL
Location: INTERSTITIAL
SPARSE OL REPLACED BY SMEC + CARB;
CARBONATE
Location: VESICLES, Replacing: OL
Location: INTERSTITIAL
SPARSE OL REPLACED BY SMEC + CARB;
SILICA
IDENTITY QUESTIONABLE*
Vesicles -
Size(mm): 0.5-1
Percent: 5
Filling: EMPTY,SMEC,CARB
MANY VESICLES OPEN WHILE OTHERS ARE RIMMED WITH
SMEC AND FILLED WITH CARB*
Leg : 37 Top/Bottom Interval(mm): 770/ 800 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 272.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 272.79 Sect/Pc #: 1/PCE 8
ROCK = APHYRIC BASALT
GROUNDMASS POORLY CRYSTALLIZED,SIMILAR TO 16-4
(110 CM);
Texture: APHYRIC*
Groundmass - OLIVINE ( 3%)
Size(mm): 0.2-0.3
PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE*
Alteration - SMECTITE
Location: VESICLES,
Location: INTERSTITIAL
BROWN SMEC AFTER OL,ONLY SLIGHT ALTERATION;
SILICA
Location: VESICLES
IDENTITY QUESTIONABLE*
Vesicles -
Size(mm): 0.5
Percent: 1-2
Filling: SMEC,SILICA
SMEC? AND/OR SILICA? LINING VESICLES*
Leg : 37 Top/Bottom Interval(mm): 1400/1430 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 272.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 274.92 Sect/Pc #: 2/PCE 12
ROCK = APHYRIC BASALT
MODERATELY WELL CRYSTALLIZED,GROUNDMASS IS 0.1-1
MM,ROCK IS VERY FRESH;
Texture: APHYRIC,INTERGRANULAR,INTERSERTAL*
Phenocrysts- PLAGIOCLASE ( TR%)
ONE XTL,FRESH*
Groundmass - OLIVINE ( 5%)
Morphology: SUBHEDRAL
SOMEWHAT CORRODED XTLS RARELY REPLACED BY SMEC +
RARE CARB;
PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS ( 5-10%)
FRESH,PATCHES RICH IN IRON OXIDE,BROWN*
Alteration - SMECTITE
Replacing: OL
RARELY REPLACING OL;
CARBONATE
Replacing: OL
RARELY REPLACING OL*
Vesicles -
Percent: 0
Leg : 37 Top/Bottom Interval(mm): 30/ 60 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 272.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 275.05 Sect/Pc #: 3/PCE 1
ROCK = APHYRIC BASALT
SAME AS 17-2 (140 CM),GROUNDMASS IS 0.1-1 MM;
Texture: APHYRIC,SLIGHTLY VARIOLITIC,INTERGRANULAR,
INTERSERTAL*
Groundmass - OLIVINE
FRESH;
PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
GLASS
BROWN,SLIGHT ALTERATION TO YELLOW SMEC,SHARP
BOUNDARY SEPARATES FRESH FROM ALTERED MATERIAL*
Alteration - SMECTITE
Replacing: GLASS
GLASS HAS SLIGHT ALTERATION TO YELLOW SMEC,SHARP
BOUNDARY SEPARATES FRESH FROM ALTERED MATERIAL*
Vesicles -
Percent: 0
Leg : 37 Top/Bottom Interval(mm): 950/ 980 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 272.00 Rock Type: IGNEOUS
Core: 17 Sample Midpoint(m) : 275.97 Sect/Pc #: 3/PCE 8
ROCK = APHYRIC BASALT
SAME AS 16-4 (110 CM),MODERATELY CRYSTALLIZED
GROUNDMASS (0.1-1 MM);
Texture: APHYRIC,VARIOLITIC,INTERGRANULAR,INTERSERTAL*
Groundmass - OLIVINE ( 3-5%)
Size(mm): TO 0.5
ALL REPLACED BY BROWN SMEC;
PLAGIOCLASE
Morphology: SKELETAL
CLINOPYROXENE
Morphology: SHEAVES
GLASS
INTERSTITIAL GLASS WITH OP.MINS;
OPAQUE MINERALS
IN GLASS*
Alteration - SMECTITE
Location: VESICLES Replacing: OL,GLASS
ALL OL REPLACED BY BROWN SMEC,SOME SMEC AFTER
GLASS*
Vesicles -
Size(mm): 0.5
Percent: 1
Filling: SMEC,GLASS
A FEW GLASS FILLED VESICLES*
Leg : 37 Top/Bottom Interval(mm): 200/ 230 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 281.50 Rock Type: IGNEOUS
Core: 18 Sample Midpoint(m) : 281.72 Sect/Pc #: 1/PCE 2
ROCK = APHYRIC BASALT
SAME AS 16-4 (110 CM);
Texture: APHYRIC*
Groundmass - OLIVINE ( 5%)
Morphology: SUBHEDRAL
PARTLY CORRODED,MOSTLY REPLACED BY YELLOW AND
BROWN SMEC;
PLAGIOCLASE
FORMS POORLY CRYSTALLIZED MIXTURE WITH CPX + GLASS
WITH OP.MINS,GENERALLY FRESH;
CLINOPYROXENE
FORMS POORLY CRYSTALLIZED MIXTURE WITH PLAG +
GLASS WITH OP.MINS,GENERALLY FRESH;
GLASS
CONTAINS OP.MINS,FORMS POORLY CRYSTALLIZED MIXTURE
WITH PLAG + CPX,SLIGHT ALTERATION TO SMEC;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE,IN GLASS WHICH FORMS
POORLY CRYSTALLIZED MIXTURE WITH PLAG + CPX*
Alteration - SMECTITE
Location: VEINLET Replacing: GLASS
SLIGHT SMEC AFTER GLASS,ONE VEINLET LINED WITH
SMEC AND FILLED WITH CARB;
CARBONATE
Location: VEINLET
ONE VEINLET LINED WITH SMEC AND FILLED WITH CARB*
Vesicles -
Size(mm): 0.3
Percent: 1
Leg : 37 Top/Bottom Interval(mm): 60/ 90 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 291.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 291.08 Sect/Pc #: 1/PCE 1
ROCK = APHYRIC BASALT
ROCK IS POORLY CRYSTALLIZED;
Texture: APHYRIC,VARIOLITIC*
Groundmass - PLAGIOCLASE
Size(mm): TO 0.5 Morphology: LATHS,SKELETAL
OLIVINE ( 2-3%)
Size(mm): 0.1-0.2
IN MATRIX OF GLASSY MATERIAL INCIPIENTLY
DEVITRIFIED TO SHEAVES OF CPX;
CLINOPYROXENE
Morphology: SHEAVES
MATRIX OF GLASSY MATERIAL INCIPIENTLY DEVITRIFIED
TO SHEAVES OF CPX,MINUTE OP.MINS ASSOCIATED WITH
CPX;
GLASS
MATRIX OF GLASSY MATERIAL INCIPIENTLY DEVITRIFIED
TO SHEAVES OF CPX,VERY MINOR SMEC AFTER GLASS;
OPAQUE MINERALS ( 1%)
MINUTE OP.MINS ASSOCIATED WITH CPX*
Alteration - ZEOLITE
Location: VESICLES
MINOR ZEOLITES?-SILICA? IN VESICLES;
SILICA
Location: VESICLES
MINOR ZEOLITES?-SILICA? IN VESICLES;
SMECTITE
Replacing: GLASS
VERY MINOR SMEC AFTER GLASS*
Vesicles -
Size(mm): 0.3
Percent: <1
Filling: ZEOLITES,SILICA
MINOR ZEOLITES?-SILICA? IN VESICLES*
Leg : 37 Top/Bottom Interval(mm): 470/ 490 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 291.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 292.98 Sect/Pc #: 2/PCE 5
ROCK = APHYRIC BASALT
SAME AS 19-1 #1 EXCEPT BETTER CRYSTALLIZED AND
SLIGHTLY MORE YELLOW SMEC IN MATRIX + VESICLES;
Texture: APHYRIC,VARIOLITIC*
Phenocrysts- PLAGIOCLASE ( TR%)
FRESH*
Groundmass - OLIVINE
ALL REPLACED BY LIGHT BROWN SMEC*
Alteration - SMECTITE
Location: MATRIX, Replacing: OL
Location: VESICLES,
Location: GROUNDMASS
YELLOW SMEC IN MATRIX + VESICLES,LIGHT BROWN SMEC
TOTALLY REPLACES OL AND ALSO APPEARS IN
GROUNDMASS*
Vesicles -
Size(mm): 0.5
Percent: 1
Filling: SMEC
YELLOW SMEC FILLING*
Leg : 37 Top/Bottom Interval(mm): 930/ 950 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 291.00 Rock Type: IGNEOUS
Core: 19 Sample Midpoint(m) : 294.94 Sect/Pc #: 3/PCE 11
ROCK = APHYRIC BASALT
SAME AS 19-1 #1 WITH ONLY SLIGHTLY BETTER
CRYSTALLIZATION;
Texture: APHYRIC*
Groundmass - OLIVINE ( 2-3%)
Size(mm): 2 Morphology: SKELETAL
FRESH,2V=90*
Alteration - SMECTITE
Location: VESICLES
ONLY MINOR YELLOW + BROWN SMEC;
CARBONATE
Location: VESICLES
MINOR*
Vesicles -
Size(mm): 0.3-0.5
Percent: 2-3
Filling: SMEC,CARB,GLASS
MINOR SMEC + CARB FILLING,A FEW GLASSY VESICLES*
Leg : 37 Top/Bottom Interval(mm): 980/1000 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 300.50 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 301.49 Sect/Pc #: 1/PCE 10C
ROCK = APHYRIC BASALT
WELL CRYSTALLIZED,GROUNDMASS IS 0.1-1 MM;
Texture: APHYRIC,SLIGHTLY VARIOLITIC,SUBOPHITIC,
INTERGRANULAR*
Groundmass - PLAGIOCLASE
Size(mm): 0.5-0.8 Morphology: LATHS
0.5-0.8 MM LONG,PARTLY SURROUNDED BY XTLS OF CPX
WITH SOME INTERSTITIAL CLAY.MIN AFTER GLASS;
CLINOPYROXENE
PARTLY SURROUNDING PLAG ALONG WITH SOME
INTERSTITIAL CLAY.MIN AFTER GLASS,2VZ=45;
OLIVINE ( 2-3%)
REPLACED BY SMEC;
OPAQUE MINERALS ( 1-2%)
Alteration - SMECTITE
Location: VESICLES Replacing: OL
BROWN;
CLAY MINERALS
Location: INTERSTITIAL Replacing: GLASS
INTERSTITIAL CLAY AFTER GLASS?;
CARBONATE ( TR%)
Vesicles -
Size(mm): 0.3
Percent: 3.5
Filling: SMEC
Leg : 37 Top/Bottom Interval(mm): 160/ 180 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 300.50 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 302.17 Sect/Pc #: 2/PCE 1A
ROCK = APHYRIC BASALT
MODERATELY WELL CRYSTALLIZED,GROUNDMASS 0.1-1 MM;
Texture: APHYRIC,SLIGHTLY VARIOLITIC,SUBOPHITIC,
INTERGRANULAR*
Groundmass - PLAGIOCLASE
Morphology: SUBHEDRAL,LATHS
ENVELOPED BY CPX;
CLINOPYROXENE
ENVELOPING PLAG;
OLIVINE ( 2-3%)
REPLACED BY BROWN SMEC;
OPAQUE MINERALS ( 2-3%)
GLASS
INTERSTITIAL,SOME REPLACED BY BROWN SMEC*
Alteration - SMECTITE
Location: INTERSTITIAL Replacing: OL,GLASS
SMEC IS BROWN,REPLACES OL + SOME INTERSTITIAL
GLASS*
Vesicles -
Size(mm): 0.3-0.5
Percent: 1-2
Filling: SMEC
SMEC FILLING IS BROWN*
Leg : 37 Top/Bottom Interval(mm): 380/ 400 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 300.50 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 302.39 Sect/Pc #: 2/PCE 1C
ROCK = APHYRIC BASALT;
Texture: APHYRIC,SUBOPHITIC,INTERGRANULAR*
Phenocrysts- PLAGIOCLASE ( <1%)
FRESH,TWO XTLS WITH SODIC RIMS*
Groundmass - OLIVINE
NOT CLEARLY IDENTIFIED IN GROUNDMASS--THERE ARE A
FEW RED-BROWN IDDINGS XTLS AND SOME SMEC PATCHES
SUGGESTIVE OF OL PSEUDOMORPHS;
PLAGIOCLASE
CLINOPYROXENE
2VZ=45;
OPAQUE MINERALS
INCLUDES MAGN + ILMENITE;
CRYPTOCRYSTALLINE ( 2-3%)
APHANITIC-CRYPTOCRYSTALLINE;
GLASS
IDENTITY UNCERTAIN--ALTERED TO SMEC*
Alteration - SMECTITE
Location: INTERSTITIAL, Replacing: GLASS
Location: VESICLES
SMEC IS YELLOW,REPLACING GLASS IS QUESTIONABLE*
Vesicles -
Size(mm): 0.3
Percent: 1-3
Filling: SMEC,OP.MINS
SMEC FILLING IS YELLOW*
Leg : 37 Top/Bottom Interval(mm): 1400/1450 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 300.50 Rock Type: IGNEOUS
Core: 20 Sample Midpoint(m) : 303.43 Sect/Pc #: 2/
ROCK = PLAG-CPX-OL MICROPHYRIC BASALT
SOURCE IS IR, ROCK IS FRESH;
Texture: MICROPHYRIC, QUENCH XTLS IN VARIOLITIC
Texture: URE*
Groundmass - PLAGIOCLASE ( 5%)
Size(mm): <1
CLINOPYROXENE ( 5%)
OLIVINE ( TR%)
MICROCRYST GROUNDMASS ( 90%)
Leg : 37 Top/Bottom Interval(mm): 470/ 490 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 310.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 310.48 Sect/Pc #: 1/
ROCK = ANORTHOSITIC GABBRO
SOURCE IS IR;
Texture: PLAG-CPX ADCUMULATE, EXSOLUTION IN CPX*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): 1-6
CLINOPYROXENE ( 40%)
Alteration - SERICITE
MINOR*
Leg : 37 Top/Bottom Interval(mm): 470/ 490 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 310.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 310.48 Sect/Pc #: 1/PCE 5
ROCK = GABBRO;
Texture: APHYRIC,HYPIDIOMORPHIC,GRANULAR*
Groundmass - PLAGIOCLASE
Size(mm): 2-2.5 Morphology: SUBHEDRAL,PRISMS
2-2.5 MM LONG,APPROX COMP AT LEAST AN70,UNZONED,
FRESH,SOME PYX XTLS ENCLOSED;
CLINOPYROXENE
Size(mm): TO 10 Morphology: ANHEDRAL
AUGITE,LARGE XTLS WITH PRONOUNCED (100) PARTING,
OFTEN TWINNED,SOME WITH PLAG INCLUSIONS,TYPICALLY
WITH MINUTE VEINLETS OF BIREFRINGENT MATERIAL
(TALC?),2VZ=45,VERY PALE BROWN;
ORTHOPYROXENE ( 15%)
Size(mm): TO 3 Morphology: PRISMATIC
COLORLESS,TO 3 MM LONG,EXTINCTION SLIGHTLY
INCLINED TO 2 DEGREES,SLIGHT EXSOLUTION OF CPX,
2VZ=75-80 SUGGESTS APPROX COMP EN95,OCCASIONALLY
FORMS RIMS ON CPX IN CONTACT WITH PLAG,RARELY AS
EXSOLUTION LAMELLAE IN CPX;
OPAQUE MINERALS ( TR%)
Alteration - CHLORITE
MINOR GREEN CHLORITE BETWEEN SOME XTLS*
Vesicles -
Percent: 0
Leg : 37 Top/Bottom Interval(mm): 520/ 580 Describer: Hill, R.E.
Hole: 334 Top of Core Depth(m) : 310.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 310.55 Sect/Pc #: 1/
ROCK = GABBRO
SOURCE IS IR;
Texture: COARSE-GRAINED,HOLOXTLLINE,HYPIDIOMORPHIC
GRANULAR*
Groundmass - PLAGIOCLASE ( 38%)
Size(mm): TO 3 Morphology: SUBHEDRAL-ANHEDRAL TABULAR-
Morphology: EQUANT
COMPLEX ALBITE,CARLSBAD AND PERICLINE TWINNING ARE
UBIQUITOUS,THE XTLS ARE STRAINED AS EVIDENCED BY
SHADOWY EXTINCTION AND BY DISTORTED AND FRACTURED
TWIN LAMELLAE,THEY ARE SUBTLY NORMALLY ZONED WITH
COMPOSITIONS RANGING FROM AN85 TO AN90(ELECTRON
MICROPROBE);
ORTHOPYROXENE ( 22%)
Size(mm): TO 4 Morphology: SUBHEDRAL-ANHEDRAL
XTLS EXHIBIT FAINT PLEOCHROISM FROM PALE PINK TO
GREEN AND ARE MODERATELY CLEAVED AND FRACTURED,
THEY COMMONLY INCLUDE SMALL SUBHEDRA OF TWINNED
PLAG AND PARTLY MANTLE GRAINS OF CPX,EXTREMELY
FINE,CLOSELY SPACED EXSOLUTION LAMELLAE OF THE
BUSHVELD TYPE,PARALLEL TO (100) OF THE HOST ARE
OBSERVABLE IN THIN SECTION IN GRAINS OF SUITABLE
ORIENTATION,IN OTHER GRAINS THIS EXSOLUTION IS
OBSERVED AS A FINE DIFFUSE LAMELLAR TEXTURE
PARALLEL TO (100) WHEN VIEWED UNDER CROSSED NICOLS
PARTICULARLY NEAR EXTINCTION;
CLINOPYROXENE ( 40%)
Size(mm): 4 Morphology: SUBHEDRAL-ANHEDRAL+LARGE
Morphology: SUBORDINATE TABULAR SUBHEDRAL
Morphology: PHENOS
AUGITIC,PHENOS UP TO 1CM LONG,ALL GRAINS CONTAIN
EXSOLUTION LAMELLAE OF CA-POOR PYX ALIGNED
PARALLEL TO (100) AND (001),THE (001) LAMELLAE
ARE LARGER,REACHING .005MM IN WIDTH,THE (100)
LAMELLAE PREDOMINATE AND ARE EXTREMELY FINE AND
CLOSELY SPACED,THE XTLS ARE WELL CLEAVED AND ARE
COMMONLY TWINNED ABOUT (100) PLANE*
Leg : 37 Top/Bottom Interval(mm): 980/1000 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 310.00 Rock Type: IGNEOUS
Core: 21 Sample Midpoint(m) : 310.99 Sect/Pc #: 1/PCE 9B
ROCK = GABBRO
ROCK QUITE FRESH;
Texture: APHYRIC,HYPIDIOMORPHIC,COARSE GRAINED*
Groundmass - PLAGIOCLASE ( 45%)
Size(mm): 1-1.5 Morphology: SUBHEDRAL,LATHS,PRISMS
1-1.5 MM LONG;
CLINOPYROXENE ( 30%)
Size(mm): TO 10 Morphology: ANHEDRAL
TO 10 MM ACROSS,COLORLESS,WITH ABUNDANT LAMELLAE
OF OPX,SOME MARGINAL ALTERATION TO PALE GREEN-
COLORLESS AMPHIBOLE,OFTEN TWINNED,PARTING ON
(100),2VZ=50;
ORTHOPYROXENE ( 20%)
COLORLESS TO FAINTLY PLEOCHROIC WITH LAMELLAE OF
CPX*
Alteration - AMPHIBOLE ( 5%)
Replacing: CPX
SOME MARGINAL ALTERATION OF CPX TO PALE GREEN-
COLORLESS AMPH;
LIMONITE
Location: FRACTURES
SOME LIMONITE STAINING ON FRACTURES*
Leg : 37 Top/Bottom Interval(mm): 50/ 60 Describer: Hill, R.E.
Hole: 334 Top of Core Depth(m) : 319.50 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 319.56 Sect/Pc #: 1/PCE 1
ROCK = GABBRO
EXTENSIVELY ALTERED,SOURCE IS IR;
Texture: COARSE-GRAINED,CATACLASTIC*
Groundmass - PLAGIOCLASE
Size(mm): TO 1 Morphology: 0SUBHEDRAL-ANHEDRAL
FRACTURED WITH ABRADED AND SUTURED MARGINS,XTLS
EXHIBIT EVIDENCE OF EXTENSIVE STRAIN,BEING
CHARACTERIZED BY PRONOUNCED UNDULATORY EXTINCTIONS
AND BENT AND FRACTURED TWIN LAMELLAE,TWINNING IS
NOT UBIQUITOUS BUT,WHERE PRESENT,IS QUITE COMPLEX,
SMALLER TWINNED ANHEDRA OF PLAG OCCUR AS GRANULAR
MOSAICS IN THE INTERSTICES BETWEEN LARGER ABRADED
FELDSPARS,TOGETHER WITH GRAINS OF ALTERED CPX AND
BLOCKY SECONDARY AMPHIBOLE,THE LARGE FELDSPAR
XTLS COMMONLY CONTAIN MANY TRAINS OF FLUID
INCLUSIONS AND ARE OFTEN ASSOCIATED WITH AND
PARTLY ALTERED TO FINE GRAINED PREHNITE;
CLINOPYROXENE
Size(mm): TO 1 Morphology: 0RAGGED ANHEDRAL REMNANTS
CONTAINS VISIBLE EXSOLUTION LAMELLAE OF CA-POOR
PYX ALIGNED PARALLEL TO THE (100) PLANE,EXTENSIVE
REPLACEMENT BY A MIXTURE OF PALE GREEN PLEOCHROIC,
FIBROUS AMPHIBOLE AND DARKER GREEN-BROWN CHLORITE,
THE HEAVILY ALTERED CPX IS COMMONLY MANTLED BY
PLEOCHROIC DARK GREEN-BROWN,LATE MAGMATIC HBL
WHICH ALSO OCCURS AS FINER GRAINED BLOCKY,
OCCASIONALLY TWINNED,SUBHEDRA FILLING FRACTURES
AND OCCURRING IN THE INTERSTICES BETWEEN THE
COARSER XTLLINE PHASES,SOME ANHEDRAL FELTED MASSES
OF VERY PALE GREEN FIBROUS AMPHIBOLE ARE THOUGHT
TO BE PSEUDOMORPHOUS AFTER PRIMARY OPX,ALTHOUGH NO
FRESH OPX WAS OBSERVED IN THIN SECTION*
Alteration - PREHNITE
Location: VEINS Replacing: PLAG
PREHNITIZATION HAS BEEN EXTENSIVE,VEINS OF
PREHNITE UP TO .3MM IN DIAMETER CUT ALL OTHER
MINERALS,AND LARGE PATCHES,PRESUMABLY ONCE
FELDSPAR,ARE NOW OCCUPIED BY AN EQUIGRANULAR
MOSAIC OF THIS PREHNITE,THE PREHNITE IS COMMONLY
ACCOMPANIED BY BROWNISH NON-PLEOCHROIC CHLORITE,
VERY FINE-GRAINED ACICULAR TREMOLITE(X-RAY ID)
ALSO OCCURS AS A SECONDARY PHASE,FILLING VUGS
WITHIN FRACTURES ACCOMPANYING THE CHLORITE AND
PREHNITE*
Leg : 37 Top/Bottom Interval(mm): 170/ 230 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 319.50 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 319.70 Sect/Pc #: 1/
ROCK = GABBRO
SOURCE IS IR;
Texture: CUMULUS PLAG,INTERCUMULUS PYX*
Groundmass - PLAGIOCLASE ( 60%)
Size(mm): <3
PYROXENE ( 40%)
Alteration - AMPHIBOLE
PARTIALLY AMPHIBOLITIZED*
Leg : 37 Top/Bottom Interval(mm): 610/ 630 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 319.50 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 321.62 Sect/Pc #: 2/
ROCK = PERIDOTITE
SOURCE IS IR;
Texture: CUMULUS OL,INTERCUMULUS CPX WITH MINOR
EXSOLUTION,GABBRO IS 15% RODINGITE*
Groundmass - OLIVINE ( 70%)
Size(mm): 10-20
95% SERPENTINIZED;
CLINOPYROXENE ( 15%)
Size(mm): 1-4
Alteration - SERPENTINITE
Leg : 37 Top/Bottom Interval(mm): 610/ 630 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 319.50 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 321.62 Sect/Pc #: 2/PCE 5
ROCK = SERPENTINIZED PERIDOTITE;
Texture: VERY COARSE-GRAINED*
Groundmass - OLIVINE
Size(mm): TO 15 Morphology: OVOIDS
TO 15 MM LONG,ALMOST ENTIRELY REPLACED BY SERP,
CPX XTLS BETWEEN OL XTLS,2VZ=88;
CLINOPYROXENE
Size(mm): 2-5 Morphology: IRREGULAR
2-5 MM ACROSS,BETWEEN OL XTL,HAS EXCELLENT (100)
PARTING,SURROUNDED BY BROWN-GREEN ALTERATION
MATERIAL WITH HIGH TO LOW BIREFRINGENCE + SOME
COLORLESS CHLORITE WITH ANOMALOUS EXTINCTION +
ABUNDANT ?SULFIDES;
ORTHOPYROXENE
COULD NOT DEFINITELY IDENTIFY OPX BUT THIS MAY BE
SOME ALTERED OL MATERIAL*
Alteration - SERPENTINITE
Replacing: OL
COLORLESS WITH ABUNDANT IRON OXIDE DUST AND
GRANULES,OL ALMOST ENTIRELY ALTERED TO SERP;
SULFIDE
IDENTITY QUESTIONABLE,XTLS TO 1 MM,SURROUNDING
CPX;
CHLORITE
COLORLESS WITH ANOMALOUS EXTINCTION,SURROUNDING
CPX;
OPAQUE MINERALS
Replacing: OL
COULD NOT DEFINITELY IDENTIFY OPX BUT THIS MAY BE
SOME ALTERED OL MATERIAL;
OTHER
BROWN-GREEN ALTERATION MATERIAL WITH HIGH TO LOW
BIREFRINGENCE,SURROUNDING CPX*
Leg : 37 Top/Bottom Interval(mm): 800/ 820 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 319.50 Rock Type: IGNEOUS
Core: 22 Sample Midpoint(m) : 321.81 Sect/Pc #: 2/
ROCK = PERIDOTITE
SOURCE IS IR;
Texture: CPX EXSOLVED,OL CUMULUS,PYX INTERCUMULUS,
MESH, OL & OPX PARTLY SERPENTINIZED*
Groundmass - OLIVINE ( 60%)
Size(mm): 1-2
CLINOPYROXENE ( 18%)
Size(mm): 8-15
ORTHOPYROXENE ( 22%)
CHROMITE ( TR%)
Leg : 37 Top/Bottom Interval(mm): 460/ 540 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 329.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 329.50 Sect/Pc #: 1/
ROCK = PERIDOTITE
SOURCE IS IR;
Texture: OL CORRODED,EXSOLUTION LAMELLAE IN
FRESH CPX,OL TOTALLY SERPENTINIZED,
OPX-CPX-PLAG SERPENTINIZED AND RODINGITIZED*
Groundmass - OLIVINE ( 60%)
Size(mm): 10-12
ALTERED TO IDDINGS;
ORTHOPYROXENE
CLINOPYROXENE ( 40%)
PLAGIOCLASE
Leg : 37 Top/Bottom Interval(mm): 910/ 930 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 329.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 329.92 Sect/Pc #: 1/
ROCK = GABBRO
SOURCE IS IR, FRESH;
Texture: OPHITIC,MINOR CATACLASIS,PLAG CUMULUS,
CPX INTERCUMULUS*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): <2
CLINOPYROXENE ( 50%)
Leg : 37 Top/Bottom Interval(mm): 1130/1190 Describer: Hill, R.E.
Hole: 334 Top of Core Depth(m) : 329.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 330.16 Sect/Pc #: 1/PCE 12
ROCK = GABBRO
SOURCE IS IR;
Texture: COARSE-GRAINED,HOLOXTLLINE,HYPIDIOMORPHIC
GRANULAR*
Groundmass - PLAGIOCLASE ( 52%)
Size(mm): TO 3 Morphology: SUBHEDRAL-ANHEDRAL
XTLS ARE VERY SLIGHTLY NORMALLY ZONED WITH
COMPOSITIONS RANGING FROM AN78 TO AN75(ELECTRON
MICROPROBE),THEY EXHIBIT COMPLEX TWINNING AND ARE
CHARACTERIZED BY SUTURED AND ABRADED GRAIN
BOUNDARIES,BENT AND FRACTURED TWIN LAMELLAE AND
STRESS-INDUCED UNDULATORY EXTINCTION;
ORTHOPYROXENE ( 20%)
Size(mm): TO 6 Morphology: ANHEDRAL
HYPERSTHENE SLIGHTLY PLEOCHROIC FROM PALE PINK TO
GREEN,BOTH BUSHVELD AND STILLWATER TYPES OF
EXSOLUTION OF CPX ARE UBIQUITOUS,VERY FINE,CLOSELY
SPACED EXSOLUTION LAMELLAE OF THE BUSHVELD TYPE
OCCUR ALIGNED IN PLANES PARALLEL TO THE (100)
PLANE OF THE HOST,AND MORE PRIMITIVE WIDELY SPACED
VERMIFORM STRINGERS AND PATCHES OF STILLWATER-TYPE
CPX UP TO .02MM WIDE ARE CRUDELY ALIGNED PARALLEL
TO (001) IN SOME XTLS,AND IN OTHERS ARE SEEMINGLY
RANDOM,CATACLASTIC ABRASION OF THE XTLS IS
EVIDENCED IN PLACES BY THEIR IRREGULAR MARGINS,
LIMONITE STAINING IS VISIBLE ON FRACTURES WHICH
TRAVERSE THE XTLS;
CLINOPYROXENE ( 20%)
Size(mm): TO 8 Morphology: SUBHEDRAL-ANHEDRAL
XTLS CONTAIN ABUNDANT EXSOLUTION LAMELLAE OF CA-
POOR PYX ALIGNED IN TWO DIRECTIONS,THE MOST COMMON
BEING UP TO .015MM WIDE,PARALLELING THE (001)PLANE
OF THE HOST,SOME XTLS INCLUDE SMALL SUBHEDRAL TO
EUHEDRAL GRAINS OF PLAG,AUGITIC CPX XTLS ARE
IRREGULARLY MANTLED AND SOMETIMES COMPLETELY
REPLACED BY A PALE GREEN PLEOCHROIC ACTINOLITIC
AMPHIBOLE,THESE DEUTERIC OVERGROWTHS OF AMPHIBOLE
EXTEND INTO FRACTURES AS VEIN FILLINGS AND CUT
ACROSS ALL OTHER PHASES*
Leg : 37 Top/Bottom Interval(mm): 1270/1290 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 329.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 330.28 Sect/Pc #: 1/
ROCK = NORITIC GABBRO
SOURCE IS IR, FRESH;
Texture: ADCUMULATE, AUGITE AND INVERTED
Piece #: ONITE BOTH WITH EXSOLUTION LAMELLAE,
CATACLASTIZED*
Groundmass - PLAGIOCLASE ( 40%)
Size(mm): 3-15
PYROXENE ( 60%)
Leg : 37 Top/Bottom Interval(mm): 1270/1290 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 329.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 330.28 Sect/Pc #: 1/PCE 13
ROCK = GABBRO
SOME DEFORMATION OF XTLS (I.E. BENDING) AND SOME
GRANULATION ALONG XTL MARGINS;
Texture: COARSE-GRAINED,HYPIDIOMORPHIC TO
ALLOTRIOMORPHIC-GRANULAR*
Groundmass - PLAGIOCLASE ( 50%)
Size(mm): 2-4 Morphology: SUBHEDRAL-ANHEDRAL
2-4 MM ACROSS,TWIN LAMELLAE OFTEN BENT AND OFTEN
ABSENT FROM GRAINS,APPROX COMP AT LEAST AN75--
UNIFORM COMPOSITION,XTLS OFTEN GRANULATED ON
MARGINS,FRESH,SOME INCLUSIONS OF PYX;
ORTHOPYROXENE ( 30%)
Size(mm): 2-10 Morphology: ANHEDRAL
2-1/ MM ACROSS,PALE BROWN (NON PLEOCHROIC),2VX=80,
MINUTE EXSOLUTION LAMELLAE OF CPX PARALLEL TO
(100),ALSO SOME SMALL BLEBS OF CPX ON ZONES
PERPENDICULAR TO (100),SOMETIMES GRANULATED,LARGE
XTL CRUDELY PRISMATIC,SOME MARGINAL ALTERATION TO
A COLORLESS HIGH BIREFRINGENCE MATERIAL (TALC?);
CLINOPYROXENE ( 15%)
Size(mm): 1-5 Morphology: ANHEDRAL
1-5 MM ACROSS,OFTEN BENT AND MARGINALLY
GRANULATED,WITH PATCHES AND LAMELLAE OF OPX IN TWO
DIRECTIONS,SOME MARGINAL ALTERATION TO A COLORLESS
HIGH BIREFRINGENCE MATERIAL (TALC?)*
Alteration - TALC
Location: XTL MARGINS Replacing: OPX,CPX
IDENTITY QUESTIONABLE,SOME MARGINAL ALTERATION OF
OPX + CPX TO A COLORLESS HIGH BIREFRINGENCE
MATERIAL*
Leg : 37 Top/Bottom Interval(mm): 780/ 820 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 329.00 Rock Type: IGNEOUS
Core: 23 Sample Midpoint(m) : 331.30 Sect/Pc #: 2/
ROCK = PERIDOTITE
SOURCE IS IR;
Texture: TRACE OF EXSOLUTION IN ALTERED PYX, OL
AND OPX TOTALLY SERPENTINIZED*
Groundmass - OLIVINE ( 70%)
Size(mm): <2
ORTHOPYROXENE ( 15%)
PLAGIOCLASE ( 15%)
CHROMITE ( TR%)
Leg : 37 Top/Bottom Interval(mm): 1050/1070 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 338.50 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 341.06 Sect/Pc #: 2/
ROCK = OL GABBRO
SOURCE IS IR;
Texture: PLAG POIKILITIC IN CPX, OL PARTLY
ALTERED TO SERP AND IDDINGS*
Groundmass - OLIVINE ( 15%)
Size(mm): <4
PLAGIOCLASE ( 50%)
CLINOPYROXENE ( 35%)
Leg : 37 Top/Bottom Interval(mm): 1120/1140 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 338.50 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 342.63 Sect/Pc #: 3/
ROCK = OL LEUCOGABBRO
SOURCE IS IR;
Texture: ADCUMULATE,OL PARTLY SERPENTINIZED*
Groundmass - OLIVINE ( 5%)
Size(mm): 1-6
PLAGIOCLASE ( 55%)
PYROXENE ( 40%)
Leg : 37 Top/Bottom Interval(mm): 1120/1140 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 338.50 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 342.63 Sect/Pc #: 3/PCE 10
ROCK = GABBRO;
Texture: HYPIDIOMORPHIC-GRANULAR*
Groundmass - PLAGIOCLASE
Size(mm): 2-5 Morphology: SUBHEDRAL,LATHS
APPROX COMP AT LEAST AN75,FRESH;
CLINOPYROXENE
Size(mm): 2-8 Morphology: ANHEDRAL
AUGITE,2-8 MM ACROSS,VERY PALE BROWN,2VZ=50,SOME
PLAG INCLUSIONS,EXCELLENT (100) PARTING,A FEW
SMALL SERP INCLUSIONS MAY BE REPLACED OL,SOME
EXSOLUTION LAMELLAE OF OPX,SLIGHT ALTERATION TO
TALC?;
ORTHOPYROXENE ( 25%)
Size(mm): 1-2 Morphology: ANHEDRAL
2VZ/X=85,APPROX COMP EN85-95
OLIVINE
Size(mm): 6
ONE LARGE XTL AT LEAST 6 MM ACROSS PARTLY REPLACED
BY SERP + OP.MINS,OTHER SMALL AREAS OF SERP MAY BE
ANHEDRAL OL XTLS*
Alteration - TALC
Location: VEINLETS Replacing: CPX
IDENTITY QUESTIONABLE,SLIGHT ALTERATION OF CPX TO
TALC?,SOME VEINLETS OF TALC?;
SERPENTINITE
Replacing: OL
ONE LARGE XTL OF OL (AT LEAST 6 MM ACROSS) PARTLY
REPLACED BY SERP + OP.MINS--OTHER SMALL AREAS OF
SERP MAY BE ANHEDRAL OL XTLS;
OPAQUE MINERALS
Replacing: OL
ONE LARGE XTL OF OL (AT LEAST 6 MM ACROSS) PARTLY
REPLACED BY SERP + OP.MINS,NO PRIMARY OP.MINS;
AMPHIBOLE ( TR%)
Location: VEINLETS,
Location: XTL MARGINS
TRACE OF GREENISH AMPH IN VEINLETS WITH ?SULFIDE
AND ALONG SOME XTL MARGINS;
SULFIDE
Location: VEINLETS,
Location: XTL MARGINS
IDENTITY QUESTIONABLE,TRACE OF GREENISH AMPH IN
VEINLETS WITH ?SULFIDE AND ALONG SOME XTL MARGINS;
CHLORITE ( TR%)
Location: VEINS
Vesicles -
Percent: 0
Leg : 37 Top/Bottom Interval(mm): 950/ 970 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 338.50 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 343.96 Sect/Pc #: 4/PCE 10
ROCK = OLIVINE GABBRO
OVERALL ROCK QUITE FRESH;
Groundmass - PLAGIOCLASE ( 15%)
Size(mm): TO 3 Morphology: SUBHEDRAL
WITH BROWNISH ALTERATION (FAINT),IN CONTACT WITH
SOME CPX RIMS;
OLIVINE ( 10%)
2V=90,PARTLY SERPENTINIZED;
CLINOPYROXENE ( 30%)
WITH (100) PARTING,SOME PATCHY ALTERATION TO
AMPH?,SOME CPX RIMS IN CONTACT WITH PLAG;
ORTHOPYROXENE
FRESH,2VX IS LARGE*
Alteration - OTHER
Replacing: PLAG
BROWNISH ALTERATION (FAINT);
SERPENTINITE
Replacing: OL
OL PARTLY SERPENTINIZED;
AMPHIBOLE
Replacing: CPX
IDENTITY QUESTIONABLE,SOME PATCHY ALTERATION OF
CPX TO ?AMPH*
Leg : 37 Top/Bottom Interval(mm): 1000/1060 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 338.50 Rock Type: IGNEOUS
Core: 24 Sample Midpoint(m) : 344.03 Sect/Pc #: 4/
ROCK = OL GABBRO
SOURCE IS IR;
Texture: OPX AND CPX ZONE, EXSOLVED AND WITH
KINK BANDS, OL AND PLAG CUMULUS, OL PARTLY
SERPENTINIZED*
Groundmass - OLIVINE ( 35%)
Size(mm): <10
PYROXENE ( 20%)
Size(mm): <2
PYROXENE ( 45%)
Size(mm): 4
Leg : 37 Top/Bottom Interval(mm): 200/ 220 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 357.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 357.71 Sect/Pc #: 1/
ROCK = PERIDOTITE
SOURCE IS IR;
Texture: CUMULUS OL AND SPINEL,INTERCUMULUS PLAG
MESH, BASTITE, PYXS WITH EXSOLUTION, OL
ALTERED TO SERP, RODINGITE 5%*
Groundmass - OLIVINE ( 60%)
Size(mm): 3-10
PYROXENE ( 30%)
SPINEL ( 5%)
Leg : 37 Top/Bottom Interval(mm): 200/ 220 Describer: Robinson, P.
Hole: 334 Top of Core Depth(m) : 357.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 357.71 Sect/Pc #: 1/PCE 3
ROCK = GABBRO;
Texture: ALLOTRIOMORPHIC-GRANULAR,COARSE-GRAINED*
Groundmass - OLIVINE ( 50%)
Size(mm): 2-12 Morphology: ANHEDRAL
2V=90,HIGHLY FRACTURED,LARGELY REPLACED BY SERP
+ SOME YELLOW BROWN SMEC,A FEW TINY VEINLETS OF
CARB,OFTEN TWINNED,CONTAINS NUMEROUS XTLS OF BROWN
CHROMITE (PICOTITE) THAT ARE 0.1-0.3 MM ACROSS AND
ROUND,SOME SMALL IRREGULAR MASSES OF OP.MINS IN
SERP + SOME CARB + SOME OL QUITE FRESH;
CHROMITE
Size(mm): 0.1-0.3 Morphology: ROUND
BROWN CHROMITE (PICOTITE) INCLUSIONS IN OL + OFTEN
SURROUNDED BY CPX INCLUSIONS IN OPX;
ORTHOPYROXENE ( 40%)
Size(mm): TO 15 Morphology: PRISMATIC
LARGE CRUDELY PRISMATIC XTL TO 15 MM LONG,HAS
ABUNDANT AND VERY NARROW LAMELLAE OF CPX PARALLEL
TO (100),INCLUSIONS OF PICOTITE OFTEN SURROUNDED
BY CPX;
CLINOPYROXENE
ABUNDANT AND VERY NARROW LAMELLAE OF CPX IN OPX
PARALLEL TO (100)*
Alteration - OTHER
Replacing: OL
OL LARGELY REPLACED BY SERP,SOME SMALL IRREGULAR
MASSES OF OP.MINS IN SERP;
OPAQUE MINERALS
Replacing: IRREGULAR
SOME SMALL IRREGULAR MASSES OF OP.MINS IN SERP
REPLACING OL;
CARBONATE
Location: VEINLETS Replacing: OL
SOME CARB REPLACING OL,A FEW TINY VEINLETS OF CARB
IN OL;
SMECTITE
Replacing: OL
SOME YELLOW BROWN SMEC REPLACING OL*
Leg : 37 Top/Bottom Interval(mm): 700/ 750 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 357.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 358.23 Sect/Pc #: 1/
ROCK = PERIDOTITE
SOURCE IS IR;
Texture: CPX WITH EXSOLUTION LAMELLAE,OL CUMULUS,
CPX INTERCUMULUS,OL TOTALLY SERPENTINIZED,
OPX PARTLY SERPENTINIZED*
Groundmass - OLIVINE ( 65%)
Size(mm): <10
CLINOPYROXENE ( 22%)
ORTHOPYROXENE ( 13%)
CHROMITE ( TR%)
Leg : 37 Top/Bottom Interval(mm): 50/ 100 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 357.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 359.08 Sect/Pc #: 2/
ROCK = PERIDOTITE
SOURCE IS IR;
Texture: CUMULUS OL AND SPINEL, INTERCUMULUS
Piece #: AND PLAG,MESH,BASTITE,OL TOTALLY
SERPENTINIZED,OPX PARTLY SERPENTINIZED*
Groundmass - OLIVINE ( 80%)
Size(mm): 2-3
PYROXENE ( 15%)
COMBINATION ( 5%)
INCLUDES SPINEL+RODINGITE*
Leg : 37 Top/Bottom Interval(mm): 560/ 710 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 357.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 359.64 Sect/Pc #: 2/
ROCK = OLIVINE GABBRO
SOURCE IS IR;
Texture: EXSOLUTION LAMELLAE IN PYXS, CUMULUS
Piece #: (AND OL?), OL PARTLY SERPENTINIZED*
Groundmass - OLIVINE ( 20%)
Size(mm): <4
PLAGIOCLASE ( 40%)
PYROXENE ( 40%)
Leg : 37 Top/Bottom Interval(mm): 590/ 640 Describer: Clarke, D.B.
Hole: 334 Top of Core Depth(m) : 357.50 Rock Type: IGNEOUS
Core: 26 Sample Midpoint(m) : 359.62 Sect/Pc #: 2/
ROCK = OL GABBRO
(PYROXENITE), SOURCE IS IR;
Texture: PLAG CUMULUS,PYXS WITH EXSOLUTION
LAMELLAE,OL SERPENTINIZED*
Groundmass - OLIVINE ( 10%)
Size(mm): <3
PLAGIOCLASE ( 20%)
PYROXENE ( 70%)
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