Leg : 92 Top/Bottom Interval(mm): 0/1500 Analyst: Pearce, J.A.
Hole: 597B Sample Midpoint (m) : 55.90
Core: 2 Top of Core Depth (m) : 54.40
Sect: 1 Top of Section Depth(m): 54.40
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW(?);
Piece No. : PCES 1A (0-22), 1B (21-35), 2 (37-43), 3 (36-37),
4 (51-56), 5A (58-67), 5B (68-87), 5C (89-93),
5D (94-97), 6 (100-101), 7 (104-113), 8 (116-120),
9 (125-137), 10 (144-148);
Texture : BASALT IS FINE TO MEDIUM-GRAINED AND PREDOMINANTLY
APHYRIC BUT WITH RARE MICROPHENOS OF CPX,
MINERALOGY INCLUDES PLAG AND CPX (AND OXIDES);
Structure : VEINS ARE RARE AND FILLED WITH 1) BROWN IRON OXIDE/
CLAY(?)-ESPECIALLY PCE 5B, OR 2) CALCITE- ESPECIALLY
PCES 7-9, MASSIVE;
Alteration : SLIGHT TO MOD
PATCHY BROWN OXIDATIVE ALTERATION AT MARGINS OF
SOME FRAGMENTS AND AROUND SOME VEINS, PCES 1A-B
LEAST ALTERED;
Comments : NO IGNEOUS CONTACTS WITHIN SECTION;
Vesicles : Size(mm): TO 1 Percent: 10-20
Location: Filling: SMEC, CALCITE,
Location: Filling: ZEOLITE
HIGHLY VESICULAR RANGING FROM 10-20% BY VOLUME AND
UP TO 1MM IN DIAMETER-SUB-SPHERICAL, MOST VESICLES
FILLED THOUGH EMPTY VESICLES COMMON IN PCES 8-10,
FILLINGS: BROWN STAINED ZEOLITE(?), CALCITE,
GREEN SMEC (PCE 7 ONLY), IN ZONED VESICLES CALCITE
OCCUPIES CENTRE;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
Replacement: OXIDES
SMECTITE
GREEN;
CALCITE
ZEOLITE
ID UNCERTAIN, BROWN STAINED;
Leg : 92 Top/Bottom Interval(mm): 0/1500 Analyst: Pearce, J.A.
Hole: 597B Sample Midpoint (m) : 57.40
Core: 2 Top of Core Depth (m) : 54.40
Sect: 2 Top of Section Depth(m): 55.90
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW(?);
Piece No. : PCES 1A (0-10), 1B (10-21), 1C (21-29), 2 (32-49),
3 (51-63), 4 (65-71), 5A (74-80), 5B (80-84),
6 (85-96), 7A (98-105), 7B (105-117), 8 (119-124),
9 (126-150);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED;
Structure : RARE CALCITE VEINS IN PCES 1-7, CELADONITE+ZEOLITE+
PYRITE+CALCITE VEINS FORM UPPER AND LOWER EDGES OF
PCES 8+9, MASSIVE FLOW(?);
Alteration : MODERATE
OXIDATIVE ALTERATION COMMON BUT VARIABLE INVOLVING
REPLACEMENT OF CPX BY ORANGE-BROWN FE OXIDE-
HYDROXIDES AND STAINING OF FELDSPARS;
Comments : MATRIX CONTAINS CELADONITE AND ZEOLITES, NO IGNEOUS
CONTACTS WITHIN SECTION;
Vesicles : Size(mm): TO 1 Percent: 20
Location: Filling: ZEOLITE, FE.OX,
Location: Filling: CALCITE, CELAD
Location: Filling: PYRITE
HIGHLY VESICULAR THROUGHOUT (CA 20% BY VOLUME),
VESICLES RANGING UP TO 1MM IN DIAMETER, FILLING
VARIABLE FROM 0-100%, IN PCES 1-7 ZEOLITE (+ IRON
OXIDES) AND CALCITE COMMON, IN PCES 8+9 BLUE-GREEN
CELADONITE AND ZEOLITE COMMON, ONE VESICLE IN PCE
9 HAS CELADONITE RIM AND ZEOLITE AND PYRITE IN
CENTRE;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
REPLACEMENT OF CPX BY ORANGE-BROWN FE.OX-HYDRX;
Replacement: PYRITE
CELADONITE
OCCURS IN PCES 8+9;
CALCITE
ZEOLITE
FERROUS HYDROX MINS
FERROUS MN OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/1500 Analyst: Pearce, J.A.
Hole: 597B Sample Midpoint (m) : 58.90
Core: 2 Top of Core Depth (m) : 54.40
Sect: 3 Top of Section Depth(m): 57.40
LITHOLOGY: BASALT;
MASSIVE FLOW(?);
Piece No. : PCES 1 (0-11), 2 (14-18), 3A (20-35), 3B (35-41),
4 (44-50), 5A (53-54), 5B (53-54), 6 (55-63),
7 (65-78), 8 (71-76), 9 (78-80), 10 (81-86),
11A (88-95), 11B (95-102), 12 (104-118),
13 (121-136), 14 (129-150);
Texture : FINE TO MEDIUM-GRAINED, SLIGHTLY PORPHYRITIC (<2%)
TO APHYRIC, MINERALOGY INCLUDES PLAG+CPX+FE.OX;
Structure : MASSIVE(?), VERY THIN BLACK CELADONITE VEINS OCCUR
THROUGHOUT, CALCITE VEINS RARER BUT THICKER (<1.5MM)
ESPECIALLY IN PCE 14;
Alteration : EXT
STRONG PERVASIVE ALTERATION DOMINATED BY
REPLACEMENT OF PRIMARY MINERALS BY CELADONITE,
GREEN SMECTITE (ESPECIALLY 3A-B), ZEOLITE AND
ORANGE FE.OX.HYDRX, DETAILS OF ALTERATION VARY
DOWN SECTION AS SEEN IN DARK 'ALTERATION FRONTS'
RICH IN CELADONITE WHICH GIVE ROCK A PATCHY DARK-
PALE GREY APPEARANCE;
Comments : NO IGNEOUS CONTACTS WITHIN SECTION;
Vesicles : Size(mm): Percent: 5
Location: Filling: CELADONITE, FE.OX
Location: Filling: ZEOLITE, CALCITE
CA 5% BY VOLUME, USUALLY FILLED WHOLLY OR
PARTIALLY, CELADONITE MOST COMMON FILLING BUT ALSO
IRON OXIDE, ZEOLITE AND CALCITE, ZONING COMMON,
OFTEN CELADONITE RIM AND CALCITE GROWING INTO
CENTRE, ORANGE IRON OXIDE-HYDROXIDE ALTERATION
OUTSIDE VESICLES;
Phenocrysts: CLINOPYROXENE
Size(mm): <1.5
PHENOS AND MICROPHENOS (<1.5MM) ARE OF CPX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Replacement: PSEUDOMORPHING OF PYX BY THE VARIOUS ALTERATION
MINERALS IS COMMON;
FERROUS MN OXIDE
CELADONITE
SMECTITE
ZEOLITE
CALCITE
FERROUS HYDROX MINS
Leg : 92 Top/Bottom Interval(mm): 0/1500 Analyst: Erzinger, J.
Hole: 597B Sample Midpoint (m) : 65.00
Core: 3 Top of Core Depth (m) : 63.50
Sect: 1 Top of Section Depth(m): 63.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW(?);
Piece No. : PCES 1 (0-20), 2 (24-36), 3 (39-46), 4 (49-71),
5 (73-89), 6 (92-108), 7 (110-128), 8 (131-150);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED BASALT, TRACE OF
MICROPHENOS OF CPX, MINERALOGY INCLUDES CPX AND PLAG
AND FE.OX IN ALL PCES EXCEPT PCES 1 + BOTTOM OF 5;
Structure : VEINS ARE RARE, PCE 3 IS FILLED WITH CALCITE AND
PCE 7 (112CM) IS FILLED WITH CELADONITE (1-1.5MM)
MASSIVE FLOW(?);
Alteration : EXT
STRONG ALTERATION WITH VARIATION DOWN SECTION,
REPLACEMENT OF PRIMARY MINERALS BY GREEN-BLUE
SMECTITE(?) AND ORANGE RED IRON OXIDES, PCE 1 IS
DARK-PALE GREY WITH NO RED IRON OXIDES AND MAINLY
DARK ALTERATION MINERALS, PCE 5 WITH 'ALTERATION
FRONT'- TOP WITH FE-OXIDES AND BOTTOM LIKE PCE 1;
Comments : NO IGNEOUS CONTACT WITHIN SECTION;
Vesicles : Size(mm): Percent: <1
Location: Filling: SMECTITE, ZEOLITE
Location: Filling: IRON OXIDES
<1% BY VOLUME, FILLED WITH GREEN-BLUE SMEC IN PCE
1+5(BOTTOM), OTHERWISE FE-OXIDES AND ZEOLITE;
Phenocrysts: CLINOPYROXENE
TRACE MICROPHENOS OF CPX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Replacement: SMECTITE
FERROUS MN OXIDE
ZEOLITE
CALCITE
CELADONITE
RARE PSEUDOMORPHING OF PYX BY ALTERATION MINERALS;
Leg : 92 Top/Bottom Interval(mm): 0/ 620 Analyst: Erzinger, J.
Hole: 597B Sample Midpoint (m) : 65.62
Core: 3 Top of Core Depth (m) : 63.50
Sect: 2 Top of Section Depth(m): 65.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW(?);
Piece No. : PCES 1A (0-17), 1B (21-38), 2 (42-61);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED, TRACE MICROPHENOS
OF CPX, MINERALOGY INCLUDES PLAG AND CPX AND FE.OX-
(FE.OX IN PCES 1A-B);
Structure : VEINS ARE RARE AND COMMONLY FILLED WITH IRON OXIDES
WITH PARTLY ALTERED ZONE NEARBY, MASSIVE FLOW(?);
Alteration : MODERATE TO STRONG
VARIATIONS DOWN SECTION AND REPLACEMENT OF PRIMARY
MINERALS BY GREEN-GREY SMECTITE(?) ZEOLITE AND
ORANGE-RED IRON OXIDES, PCE 1A HAS COMMON FE-OX
ALTERATION, PCE 1B HAS 'ALTERATION FRONT'- TOP
DARK GREEN BLUE ALTERATION MINERALS AND BOTTOM
IRON OXIDES, PCE 2 HAS GREEN BLUE GREY SMECTITE &
ZEOLITE;
Comments : IT SEEMS THAT PCES 1A-B ARE NOT TOGETHER;
Vesicles : Size(mm): <1 Percent: <1
Location: Filling: SMECTITE, CALCITE
Location: Filling: IRON OXIDES
<1% BY VOLUME, PCES 1A+1B(BOTTOM) ARE FILLED
PARTLY WITH IRON OXIDE RIM AND CALCITE IN CENTRE
OR FULL FILLED WITH IRON OXIDES, PCES 1B(TOP)+2
FILLED WITH GREEN BLUE SMECTITE(?), <1MM DIAMETER;
Phenocrysts: CLINOPYROXENE
TRACE MICROPHENOS OF CPX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Replacement: FERROUS MN OXIDE
FE.OX PRESENT IN MINEROLOGY IN PCES 1A-B;
SMECTITE
ID GREEN GREY AND BLUE GREEN SMECTITE UNCERTAIN;
ZEOLITE
CALCITE
PSEUDOMORPHING OF PRIMARY MINERALS BY ALTERATION
MINERALS (FE-OXIDES IN PCE 1);
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