Leg : 92 Top/Bottom Interval(mm): 0/ 70 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 55.57
Core: 3 Top of Core Depth (m) : 55.50
Sect: 1 Top of Section Depth(m): 55.50
LITHOLOGY: BASALT;
Piece No. : PCE 1 (0-7);
Texture : PCE 1 IS A FINE-GRAINED BASALT WITH A 3MM THICK
GLASSY MARGIN CONTAINING FRESH GLASS INSIDE A
PALAGONITIZED RIM;
Alteration : FRESH
A 3MM GLASSY MARGIN CONTAINING FRESH GLASS INSIDE
PALAGONITIZED RIM;
Comments : ONE HOLE ABOUT 3MM ACROSS AND RIMMED WITH IRON OXIDE
COULD HAVE BEEN A PSEUDOMORPHED PHENO (OL?);
Vesicles : Size(mm): Percent: 3
Location: Filling: ZEOLITE, SMECTIT
THERE IS A THIN VESICULAR ZONE INSIDE THE GLASSY
MARGIN CONTAINING A WHITE YELLOW MINERAL- NOT
CALCITE COULD BE ZEOLITE(?) OR SMEC(?), THE
REMAINDER CONTAINS CA 3% MICROVESICLES;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Replacement: FERROUS MN OXIDE
ONE HOLE ABOUT 3MM ACROSS AND RIMMED WITH IRON
OXIDE COULD HAVE BEEN A PSEUDOMORPHED PHENOCRYST
(OLIVINE ?);
ZEOLITE
ID ZEOLITE UNCERTAIN IN GLASSY MARGIN;
SMECTITE
ID SMEC UNCERTAIN IN GLASSY MARGIN;
Leg : 92 Top/Bottom Interval(mm): 80/1450 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 56.95
Core: 3 Top of Core Depth (m) : 55.50
Sect: 1 Top of Section Depth(m): 55.58
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 2 (9-25), 3 (26-39), 4A (42-56), 4B (57-71),
5A (74-96), 5B (95-111), 6 (114-125), 7 (127-145);
Texture : FINE TO MEDIUM-GRAINED, PREDOMINANTLY APHYRIC, RARE
MICROPHENOS OF PLAG AND CPX;
Structure : NOT STRONGLY VEINED, THICKEST (<1MM) ARE OF CALCITE
RIMMED BY YELLOW-BROWN CLAY AND HAVE VARIABLE
ORIENTATION, VERY THIN HORIZONTAL VEINS CONTAIN
SULPHIDE AND DARK GREEN CLAY +/- MANGANESE(?) OXIDE;
Alteration : MODERATE
MODERATE ALTERATION REPRESENTED BY CLAY MINERALS
(SMECTITE ?) PARTLY PSEUDOMORPHING PYX, PATCHY
BROWN OXIDATIVE ALTERATION ZONES THROUGHOUT,
OUTSIDE ZONES THE CLAY MINERAL IS GREEN-BLUE
INSIDE IT IS YELLOW-BROWN;
Comments : NO IGNEOUS CONTACTS WITHIN SECTION;
Vesicles : Size(mm): 1.5 Percent: 3-15
Location: Filling: ZEOLITE, CALCITE
Shape : SUBSPHERICAL
Location: Filling: CLAY
GENERAL INCREASE IN VESICULARITY FROM PCE 2 (CA 3%
BY VOLUME) TO PCE 7 (CA 15% BY VOLUME), VESICLES
GENERALLY SUBSPHERICAL WITH MAXIMUM SIZE 1.5MM,
VESICLE FILLING VARIABLE IN NON-OXIDATIVE ZONES IT
IS BLUE GREEN CLAY +/- CALCITE +/- DARK GREEN
CLAY, IN OXIDATIVE ZONES IT IS YELLOW BROWN CLAY
+/- CALCITE, AT BORDER, YELLOW BROWN CLAY REPLACES
BLUE GREEN CLAY, ZEOLITE MAY ALSO BE PRESENT;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
RARE MICROPHENOS OF PLAG AND CPX;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
CPX AND PLAG AND OXIDE ARE PRIMARY MINERALS;
Replacement: OXIDE
CLAY
AROUND PYRITE VEINS DARK GREEN CLAY REPLACES BLUE
GREEN CLAY;
SULFIDE
MANGANESE OXIDE
PYRITE
ZEOLITE
SMECTITE
Leg : 92 Top/Bottom Interval(mm): 0/1500 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 58.50
Core: 3 Top of Core Depth (m) : 55.50
Sect: 2 Top of Section Depth(m): 57.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-16), 2A (20-40), 2B (40-51), 2C (50-56),
2D (57-92), 3 (94-104), 4 (106-126), 5A (129-142),
5B (140-150);
Texture : FINE TO MEDIUM-GRAINED, APHYRIC WITH TRACE
MICROPHENOS OF CPX AND PLAG (AND FE.OX IN PCES 1-3,
AND 5);
Structure : VEINS ARE RARE (EXCEPT PCE 5) AND ARE CA 1-1.5MM
THICK AND COMMONLY FILLED WITH DARK ALTERATION
MINERALS AND SOME WITH CALCITE (ESPECIALLY PCE 5,
WIDTH 5-8MM);
Alteration : MODERATE
VARIATIONS DOWN SECTION, PCES 1+5 ARE OXIDATIVE
ALTERATION WITH MAINLY ORANGE FE-OXIDES, PCES 2A-
2D(TOP)+4+3(BOTTOM) HAVE LIGHT GREEN BLUE
ALTERATION MINERALS, ALTERATION FRONTS IN PCES 2B+
2D+3, VEINS IN PCE 5 SOMETIMES HAVE RED-ORANGE
ALTERED ZONE NEARBY;
Comments : NO IGNEOUS CONTACT WITHIN SECTION;
Vesicles : Size(mm): 1-5 Percent: 1-5
Location: Filling: CLAY, FE.OX,
Location: Filling: CALCITE
PCE 1 HAS 1-5% BY VOLUME AND 1-5MM IN DIAMETER,
PARTLY FILLED WITH PATCHY BROWN ORANGE CLAY
MINERALS WITH RED FE-OXIDE RIM AND SOMETIMES WITH
CALCITE IN THE CENTRE;
Size(mm): 1 Percent: <1
<1% BY VOLUME AND CA 1MM IN DIAMETER, EXCEPT PCE 5
FILLED WITH LIGHT GREEN BLUE ALTERATION MINERALS,
SOMETIMES WITH ORANGE RIMS (PCES 2DBOTTOM & 3TOP),
SOME FILLED WITH CALCITE;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
TRACE MICROPHENOS OF PLAG AND CPX (+ FE.OX IN PCES
1-3+5);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Replacement: FERROUS MN OXIDE
CLAY
SMECTITE
LIGHT GREEN BLUE CLAY MINERALS COULD BE SMEC(?);
ZEOLITE
CLAY MINERALS
PSEUDOMORPHING REPLACEMENT OF PRIMARY MINERALS BY
LIGHT GREEN CLAY MINERALS (SMEC ?) AND ORANGE RED
FE-OXIDES AND ZEOLITE;
CALCITE
Leg : 92 Top/Bottom Interval(mm): 0/ 750 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 59.25
Core: 3 Top of Core Depth (m) : 55.50
Sect: 3 Top of Section Depth(m): 58.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-20), 2 (22-41), 3 (44-62), 4 (65-75);
Texture : FINE TO MEDIUM-GRAINED BASALT, APHYRIC WITH RARE
MICROPHENOS OF CPX;
Structure : VEINS ARE RARE <1MM AND SOME FILLED WITH CALCITE BUT
MAINLY FILLED WITH DARK GREEN(?) ALTERATION
MINERALS;
Alteration : MODERATE
MODERATE ALTERATION DOWN SECTION;
Comments : NO IGNEOUS CONTACT WITHIN SECTION;
Vesicles : Size(mm): <1 Percent: <1
Location: Filling: CLAY, CALCITE,
Location: Filling: ZEOLITE
VESICLES <1% BY VOLUME AND <1MM IN DIAMETER,
SOMETIMES EMPTY WITH LIGHT YELLOW RIMS, OTHERS
FILLED WITH YELLOW BROWN CLAY AND CALCITE AND
MAYBE ALSO WITH ZEOLITES;
Phenocrysts: CLINOPYROXENE
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MINEROLOGY INCLUDES CPX AND PLAG (AND TRACE IRON
OXIDES);
Replacement: CLAY
ZEOLITE
FERROUS MN OXIDE
REPLACEMENT OF PRIMARY MINERALS BY LIGHT YELLOW
PATCHY BROWN CLAY(?) MINERALS + ZEOLITES + FEW
ORANGE RED IRON OXIDES;
CALCITE
Leg : 92 Top/Bottom Interval(mm): 0/1310 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 65.81
Core: 4 Top of Core Depth (m) : 64.50
Sect: 1 Top of Section Depth(m): 64.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1A (0-16), 1B (15-26), 1C (26-50), 1D (51-72),
1E (73-95), 1F (95-111), 1G (110-131);
Texture : FINE TO MEDIUM-GRAINED BASALT, APHYRIC WITH TRACE
MICROPHENOS OF PYX AND PLAG;
Structure : VEINS ARE COMMON AND THERE ARE TWO TYPES: A) WITH
DARK GREEN SMEC FILLING AND ALTERATION NEXT TO IT
<1MM THICK, B) WITH WHITE TO LIGHT BROWN FILLING (NO
CALCITE OR ONLY TRACES) OXIDATIVE ALTERATION (FE.OX)
NEXT TO IT, 1-5MM IN VICINITY TO THIS TYPE NATIVE
COPPER OCCURS;
Alteration : MODERATE
MOD ALTERATION WITH VARIATIONS DOWN SECTION,
ALTERATION FRONTS IN PCES 1A-C, DARKER PARTS SEEM
TO BE MORE ALTERED THAN LIGHT PARTS, IN DARKER
PARTS GREEN BLUE DARK ALTERATION MINERALS (SMEC?),
TRACE ZEOLITE, PATCHY BROWN ORANGE ALTERATION ON
MARGINS OF RIMS;
Comments : NO IGNEOUS CONTACTS WITHIN SECTION;
Vesicles : Size(mm): <1 Percent: <0.1%
Location: Filling: SMEC,COPPER
TRACE VESICLES (<0.1% BY VOLUME), SOME ARE FILLED
WITH DARK GREEN SMECTITE(?) AND SOME NEARLY
EMPTY WITH LIGHT YELLOW RIMS, NO CALCITE FILLING,
SOME WITH LIGHT GREEN TRANSPARENT CRYSTALS (COPPER
MINERALS?);
Phenocrysts: PYROXENE
PLAGIOCLASE
TRACE MICROPHENOS OF PYX AND PLAG;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX+PLAG+TRACES OF OXIDES;
COPPER
NATIVE COPPER NEAR SOME VEIN (ESPECIALLY PCES 1C-
1E), COPPER DISSEMINATED (<0.1MM);
Replacement: REPLACEMENT OF PRIMARY MINERALS BY DIFFERENT
SECONDARY MINERALS;
SMECTITE
ID SMECTITE UNCERTAIN;
CALCITE
FERROUS MN OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/1500 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 67.50
Core: 4 Top of Core Depth (m) : 64.50
Sect: 2 Top of Section Depth(m): 66.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-13), 2A (15-31), 2B (31-45), 2C (44-50),
2D (50-74), 3 (76-79), 4 (80-89), 5A (91-101),
5B ((100-115), 5C (115-117), 5D (119-126),
5E (128-140), 6 (142-150);
Texture : FINE TO MEDIUM-GRAINED, APHYRIC WITH TRACE RARE
MICROPHENOS OF CPX AND PLAG;
Structure : VEINS ARE RARE <1MM THICK, MAINLY TWO TYPES A) WITH
DARK GREEN FILLING OR LIGHT GREEN ALTERATION
MINERALS (SMEC ?) TRACES OF CALCITE, B) WHITE-LIGHT
BROWN-YELLOW MINERALS WITH FE-OXIDE OXIDATION HALOS,
NATIVE COPPER NEXT TO THE VEINS (ESP 2D+5E), PYRITE
VEINS (ESPECIALLY 5E);
Alteration : SLIGHT TO MODERATE
SOME VARIATIONS DOWN SECTION, ALTERATION FRONTS
MOSTLY IN VICINITY OF VEINS, DARKER PARTS MORE
ALTERED THAN LIGHTER PARTS, DARKER PARTS ARE
WITH DARK GREEN ALTERATION MINERALS WHICH
SOMETIMES REPLACE PRIMARY MINERALS (SMEC, ZEOL),
PCE 5E IS STRONG ALTERED WITH ABUNDANT GREEN SMEC
IN MATRIX, FE-OXIDE OXIDATION HALOES NEXT TO VEINS
ESPECIALLY IN 2D+5E, NO VISIBLE HALOES IN VEINS
WITH FILLINGS AS IN "A";
Comments : NO IGNEOUS CONTACT WITHIN SECTION, ABUNDANT GREEN
SMEC(?) IN MATRIX;
Vesicles : Size(mm): <1 Percent: <1
Location: Filling: FE.OX, PYRITE,
Location: Filling: COPPER
DIFFERENT FILLINGS-GREEN-DARK OPAQUE, LIGHT GREEN
TRANSPARENT, WHITE (NO CALCITE), DIFFERENT COPPER
MINERALS(?), PYRITE, BLUE GREEN SOME WITH FE-OXIDE
RIMS AND GREEN BLUE MINERALS IN CENTRE;
Phenocrysts: PYROXENE
PLAGIOCLASE
TRACE MICROPHENOS OF PYX AND PLAG;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX+PLAG+TRACES OF FE-OXIDES;
COPPER
NATIVE COPPER NEAR VEINS (ESPECIALLY 5E+2D);
Replacement: ALTERATION MINERALS SOMETIMES REPLACE PRIMARY
MINERALS (SMECTITE, ZEOLITE);
FERROUS MN OXIDE
PCES 2D,5A+5E;
PYRITE
SMECTITE
ID SMEC UNCERTAIN;
CALCITE
ZEOLITE
Leg : 92 Top/Bottom Interval(mm): 0/1450 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 68.95
Core: 4 Top of Core Depth (m) : 64.50
Sect: 3 Top of Section Depth(m): 67.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1A (0-25), 1B (12-42), 1C (43-62), 2 (64-67),
3A (70-77), 3B (87-101), 3C (99-115), 4 (116-121),
5 ((124-126), 6A (129-135), 6B (136-144);
Texture : FINE TO MEDIUM-GRAINED, APHYRIC WITH TRACE
MICROPHENOS OF CPX AND PLAG;
Structure : VEINS ARE RARE <1MM THICK AND FILLED WITH DARK GREEN
MATERIAL, ONE VEIN PCE 1A WITH BROWN ORANGE (IRON-
OXIDE ?) ALTERATION MINERALS NEXT TO IT (+/- 1CM
HALO);
Alteration : SLIGHT TO MODERATE
ALTERATION WITH A FEW VARIATIONS DOWN SECTION,
NEARLY NO FE-OXIDES ONLY NEAR VEINS, +/- 1CM HALO
NEAR VEIN IN PCE 1A;
Comments : NO IGNEOUS CONTACT WITHIN SECTION;
Vesicles : Size(mm): 1-1.5 Percent: <0.1
Location: Filling: SMEC
Shape : SPHERICAL
<0.1% BY VOLUME, NEARLY ALL FILLED WITH LIGHT BLUE
GREEN ALTERATION MINERALS OR SOMETIMES BLUE SMEC;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
TRACE MICROPHENOS OF CPX AND PLAG;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES PLAG AND CPX;
Replacement: SMECTITE
FERROUS MN OXIDE
ID FE.OX UNCERTAIN;
ZEOLITE
ID ZEOLITE UNCERTAIN;
REPLACEMENT OF PRIMARY MINERALS BY ZEOLITE(?) AND
SMECTITE;
Leg : 92 Top/Bottom Interval(mm): 0/1320 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 70.32
Core: 4 Top of Core Depth (m) : 64.50
Sect: 4 Top of Section Depth(m): 69.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1A (1-8), 1B (7-31), 2A (34-43), 2B (43-67),
2C (65-85), 2D (85-100), 2E (101-112), 2F (113-125),
2G (125-132);
Texture : FINE TO MEDIUM-GRAINED, APHYRIC WITH SPARSE (<<1%)
MICROPHENOS OF CPX AND PLAG (CA 1.5MM);
Structure : MASSIVE, RARE AND IRREGULAR VEINS, VERY THIN VEINS
CONTAIN DARK GREEN CLAY AND (LATER ??) BROWN CLAY
WITH ALTERATION HALOES, A FEW CONTAIN DARK GREEN
CLAY ONLY ONE OF THESE BETWEEN PCES 2E+2F CONTAINS
NATIVE COPPER, ONE VEIN OF VARIABLE THICKNESS (5MM)
IN PCES D+E APPEARS TO CONTAIN A FIBROUS MINERAL
(ZEOLITE ?) AND YELLOW BROWN CLAY AND CALCITE AND A
BLACK DARK RED/BROWN MINERAL (MICA) AND NATIVE
COPPER;
Alteration : SLIGHT TO MODERATE
ALTERATION MAINLY REPRESENTED BY VARIABLE
ALTERATION OF PYX TO DARK GREEN CLAY, PCES 2C-F
EXHIBIT OXIDATIVE ALTERATION AND CONTAIN YELLOW
BROWN CLAY, ALTERATION FRONT IN PCE 6, THIN VEINS
WITH ALTERATION HALOES;
Comments : NO IGNEOUS CONTACTS, GREY TO GREEN GREY COLOUR;
Vesicles : Size(mm): 1 Percent: <<1
Location: Filling: CLAY
Shape : SPHERICAL
RARE SPHERICAL VESICLES FILLED WITH CLAY, COLOUR
ZONING IN SOME FROM ALMOST BLACK MARGINS TO PALE
GREEN CORES;
Groundmass : PYROXENE
VARIABLE ALTERATION OF PYX TO DARK GREEN CLAY;
CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES PLAG AND CPX (AND OXIDES);
COPPER
NATIVE COPPER IN PCES 2E+2F;
Replacement: CLAY
ZEOLITE
ID ZEOLITE UNCERTAIN;
CALCITE
MICA
Leg : 92 Top/Bottom Interval(mm): 0/1380 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 71.88
Core: 4 Top of Core Depth (m) : 64.50
Sect: 5 Top of Section Depth(m): 70.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (0-10), 2 (11-16), 3 (17-30), 4A (32-37),
4B (33-44), 4C (40-52), 4D (45-64), 5A (66-110),
5B (110-113), 5C (114-138);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED WITH SPARSE MICRO-
PHENOS OF PLAG AND CPX;
Structure : MASSIVE, TWO VEINS ONLY ONE IN PCE 1 AND A SMALLER
IN PCE 3, THE VEIN IN PCE 1 COMPRISES AN OUTER BROWN
CLAY(?) ZONE AND THEN AN INNER ZONE GOING FROM BLACK
TO DARK GREEN AT THE CENTRE, WIDTH (CA 1MM) AND
ORIENTATION IS CA TWENTY DEGREES TO VERTICAL, SMALL
SUBVEIN AS ABOVE BUT NO BROWN MATERIAL IN VEIN IN
PCE 3, CONTACTS BETWEEN PCES 4A-B-C-D ALSO DARK GREE
VEIN MATERIAL;
Alteration : MOD
LEAST ALTERED SO FAR BUT STILL SHOWS GREEN/BLUE-
GREEN CLAY REPLACEMENT OF PYX IN PLACES, LITTLE
OXIDATIVE ALTERATION EXCEPT AROUND VEIN;
Comments : NO IGNEOUS CONTACTS, UNIFORM GREY COLOR, CONTACTS
BETWEEN PCES 4A-B-C-D (CONTAIN DARK GREEN VEIN
MATERIAL);
Vesicles : Size(mm): Percent: <<1
Location: Filling: CLAY
Shape : SUBSPHERICAL
RARE VESICLES CONTAINING BLACK TO DARK GREY CLAY;
Phenocrysts: SPARSE (<<1%) MICROPHENOS OF PLAG AND CPX (CA 1-
5MM);
Groundmass : PLAGIOCLASE
CLINOPYROXENE
PRIMARY MINEROLOGY IS PLAG AND CPX;
Replacement: CLAY
Leg : 92 Top/Bottom Interval(mm): 0/1400 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 73.40
Core: 4 Top of Core Depth (m) : 64.50
Sect: 6 Top of Section Depth(m): 72.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (1-15), 2A (17-20), 2B (20-22), 2C (22-28),
3 (31-34), 4A (36-41), 4B (41-59), 5 (62-89),
6 (91-108), 7A (110-119), 7B (120-124),
7C (124-133), 8 (136-139);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED WITH SPARSE MICRO-
PHENOS OF PLAG AND CPX;
Structure : TWO TYPES OF VEINS, BOTH VERTICAL OR SUBVERTICAL,
FIRST TYPE SEEN IN PCES (1-5) CONTAINS DARK GREEN
CLAY-VERY THIN (ZEOLITE ?) SECOND TYPE IN PCE 7 IS
CA 1MM THICK CONTAINING WHITE PLATY ZEOLITE(?) WITH
CALCITE IN CENTRAL VUG, ASSOCIATED IS A MARGINAL
YELLOW BROWN CLAY ZONE AND A BROWNISH ALTERATION
HALO EXTENDING CA 1.5CM INTO SURROUNDING ROCK;
Alteration : SLIGHT TO MOD
IN PCES 1-4 AND PARTS OF 5-8 MAIN EFFECT IS
REPLACEMENT OF PYX WITH BLUE-GREEN CLAY, IN PCES
5-8 VARIABLE OXIDATION REPLACES THE BLUE-GREEN
WITH YELLOW-BROWN CLAY, OXIDATION FRONT EVIDENT
WITHIN PCES 5-8 IN PART SHARP AND IN PART SHOWING
MOTTLING, ASSOCIATED WITH THE SECOND TYPE OF VEIN
IS A MARGINAL YELLOW BROWN CLAY ZONE AND A
BROWNISH ALTERATION HALO EXTENDING CA 1.5CM INTO
SURROUNDING ROCK;
Comments : NO IGNEOUS CONTACT, COLOR IS GREY WITH BROWN
PATCHES;
Vesicles : Size(mm): 0.5-1 Percent:
Location: Filling: CLAY
Shape : SUBSPHERICAL
VERY RARE VESICLES ARE SUBSPHERICAL AND CLAY
FILLED;
Phenocrysts: SPARSE (<<1%) MICROPHENOS OF PLAG AND CPX;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
PRIMARY MINEROLOGY IS PLAG AND CPX (+ OXIDES);
PYROXENE
REPLACEMENT OF PYX BY BLUE-GREEN CLAY IN PCES 1-4+
5-8;
Replacement: ZEOLITE
CLAY
Minerals Replaced: PYX
CALCITE
Leg : 92 Top/Bottom Interval(mm): 0/1500 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 75.00
Core: 5 Top of Core Depth (m) : 73.50
Sect: 1 Top of Section Depth(m): 73.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (1-15), 2 (17-19), 3 (21-32), 4A (35-39),
4B (39-44), 5 (46-49), 6 (52-57), 7 (60-66),
8 (69-72), 9 (74-76), 10 (78-82), 11 (84-87),
12 (90-96), 13 (97-99), 14 (102-105), 15 (107-110),
16 (112-116), 17 (118-126), 18 (129-140),
19 (142-150);
Texture : FINE TO MEDIUM-GRAINED, APHYRIC WITH SPARSE MICRO-
PHENOS OF PLAG AND CPX;
Structure : SPARSE THIN VEINS IN FRAGMENTS BUT ALSO AT FRAGMENT
MARGINS, FILLINGS ARE CALCITE AND PROBABLE
ZEOLITE & BROWNISH SMECTITE OR IRON OXIDE STAINING;
Alteration : MOD
MOD OXIDATIVE ALTERATION THROUGHOUT;
Comments : NO IGNEOUS CONTACT, GREY BROWN COLOR THROUGHOUT;
Vesicles : VESICLES ARE RARE AND SMALL AND CONTAIN BROWN
MATERIAL- STAINED ZEOLITE OR SMEC(?) & CALCITE(?);
Phenocrysts: SPARSE (<<1%) MICROPHENOS OF PLAG AND CPX (ABOUT
1.5MM);
Groundmass : PLAGIOCLASE
CLINOPYROXENE
PRIMARY MINEROLOGY IS PLAG AND CPX (+ OXIDES),
CALCITE IS ALSO IN GRNDMASS, BROWNISH CRYSTALLINE
MATERIAL (STAINED ZEOLITE MORE LIKELY THAN SMEC)
COMMON IN GNDMSS AND REPLACING(?) FELDSPAR;
PYROXENE
PYROXENE APPEARS FRESH;
Replacement: CALCITE
ZEOLITE
SMECTITE
FERROUS MN OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/ 680 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 75.68
Core: 5 Top of Core Depth (m) : 73.50
Sect: 2 Top of Section Depth(m): 75.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (2-7), 2 (10-15), 3 (17-20), 4 (24-31),
5 (32-37), 6 (40-48), 7 (50-68);
Texture : FINE TO MEDIUM-GRAINED WITH SPARSE MICROPHENOS OF
PLAG AND PYX;
Structure : SPARSE VEINS WITH PCE 1 SHOWING INTERESTING
RELATIONSHIP IN WHICH VEIN CONTAINING CALCITE/ZEOL
CUTS VEIN CONTAINING DARK GREEN CLAY, BOTH VEINS
HAVE BROWN OXIDIZED MARGINS;
Alteration : MOD TO EXT
ALL EXCEPT PCE 6 HAVE BROWN OXIDATIVE WEATHERING
WHERE DARK GREEN CLAY IS PRESENT AND THIS HAS
PARTLY REACTED TO A BROWN MATERIAL, PCE 4 DOES NOT
SHOW THIS ALTERATION TYPE, MAIN ALTERATION
MINERAL IS GREEN-WHITE, BOTH VEINS DESCRIBED HAVE
BROWN OXIDIZED MARGIN;
Comments : NO IGNEOUS CONTACT, COLOR IS GREY-BROWN;
Vesicles : Size(mm): <1 Percent:
Location: Filling: CLAY
Shape : SPHERICAL
SPHERICAL VESICLES IN MOST OF SECTION, CONTENTS
ARE DARK GREEN CLAY RIMMED BY YELLOW-BROWN OXIDES
AND/OR CLAY EXCEPT IN PCE 4 WHERE THEY ARE FILLED
BY GREEN WHITE CLAY, ALL ARE 100% FILLED, PCES 6-7
MAY CONTAIN MORE VESICLES BUT DIFFICULT TO ASSESS
OWING TO ALTERATION;
Phenocrysts: PLAGIOCLASE
PYROXENE
SPARSE MICROPHENOS OF PLAG AND PYX, PCES 6-7 MAY
CONTAIN A SIGNIFICANT PERCENTAGE OF MICROPHENOS OF
PYX BUT THIS IS DIFFICULT TO ASSESS OWING TO
ALTERATION;
Groundmass : PLAGIOCLASE
PYROXENE
PLAG AND CPX ARE THE MAIN MINERALS AS BEFORE, PYX
AND GNDMASS ARE PARTLY REPLACED;
Replacement: CALCITE
ZEOLITE
CLAY
Leg : 92 Top/Bottom Interval(mm): 0/1460 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 83.96
Core: 6 Top of Core Depth (m) : 82.50
Sect: 1 Top of Section Depth(m): 82.50
LITHOLOGY: PLAG SPARSELY MICROPHYRIC BASALT;
Piece No. : PCES 1 (4-8), 2 (11-15), 3A (18-26), 3B (27-38),
4 (40-44), 5 (47-52), 6A (55-65), 6B (59-66),
7 (69-74), 8 (76-85), 9 (87-93), 10 (95-101),
11 (104-106), 12A (110-124), 12B (124-135),
13 (137-142), 14 (144-146);
Texture : SPARSELY MICROPHYRIC, FINE TO MEDIUM-GRAINED, VEIN
CONTAINING SMALL ANGULAR FRAGMENTS OF WALL ROCK;
Structure : PCES 1-4 CONTAIN A THICK VEIN (1CM MAX WIDTH) SMALL
ANGULAR FRAGMENTS OF WALL ROCK AND PINKISH-BROWN
FE.OX AND/OR CLAY AND ZEOLITE(?) AND CALCITE AND A
PALE GREEN CLAY(?) AND A DARK MINERAL POSSIBLY MICA,
OTHER SMALLER VEINS ALSO PRESENT;
Alteration : MOD
IRREGULAR VARIATION IN INTENSITY (12A FRESHEST),
MOST ALTERATION IS OXIDATIVE IN WHICH YELLOW-
BROWN OXIDES/CLAYS PSEUDOMORPH PYX TO VARIOUS
DEGREES;
Comments : NO IGNEOUS CONTACTS, COLOR IS GREY;
Vesicles : Size(mm): TO 1 Percent: CA 1
Location: Filling: FE.OX, CLAY,
Shape : SPHERICAL &
Location: Filling: CALCITE
Shape : IRREGULAR
SPARSELY VESICULAR CA 1% CONTAINING ORANGE-BROWN
FE.OX/CLAY AND CALCITE AND PALE BROWN CLAY;
Phenocrysts: FELDSPAR ( CA 5%)
Size(mm): 2-3
SPARSELY MICROPHYRIC WITH CA 5% FELDSPAR;
PYROXENE ( TR%)
Size(mm): 2-3
TRACE PYX MICROPHENOS;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
GNDMASS CONSISTS OF PLAG AND CPX (+ OXIDES);
Replacement: OXIDE
FERROUS MN OXIDE
CLAY
YELLOW-BROWN OXIDES/CLAYS PSEUDOMORPH PYX TO
VARIOUS DEGREES;
MICA
CALCITE
ZEOLITE
1D ZEOLITE UNCERTAIN;
Leg : 92 Top/Bottom Interval(mm): 0/ 900 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 84.90
Core: 6 Top of Core Depth (m) : 82.50
Sect: 2 Top of Section Depth(m): 84.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (0-18), 2 (22-24), 3 (29-40), 4 (42-57),
5 (60-68), 6A (70-76), 6B (85-90);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED, RARE MICROPHENOS OF
FELDSPAR AND PYX;
Structure : MASSIVE, TRACE VEINS ARE <1MM THICK AND FILLED WITH
LIGHT BROWN FE.OX/SMECTITE;
Alteration : MOD
IRREGULAR VARIATION DOWN SECTION, ALTERATION IS
MAINLY OXIDATIVE WITH YELLOW-LIGHT BROWN OXIDES/
CLAYS(?), IN DARKER GREY PARTS THE ALTERATION
MINERALS MAY BE THE SAME ONLY THE COLOR CHANGES TO
RED-ORANGE-BROWN(ALTERATION MAY BE MORE INTENSIVE)
PSEUDOMORPHED PYX IN LIGHTER GREY PARTS;
Comments : NO IGNEOUS CONTACTS WITHIN SECTION;
Vesicles : Size(mm): 1 Percent: <<0.1
Location: Filling: FE.OX, FE.CLAY
VESICLES FILLED WITH ORANGE-BROWN FE.OX OR
FE.CLAYS;
Phenocrysts: RARE MICROPHENOS OF FELDSPAR AND PYX (1-3MM
ACROSS);
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES);
Replacement: OXIDES
Minerals Replaced: PYX
YELLOW-LIGHT BROWN OXIDES;
SMECTITE
FERROUS CLAY
YELLOW-LIGHT BROWN OXIDES/CLAYS(?) PSEUDOMORPH PYX
IN LIGHTER GREY PARTS;
CLAY
Minerals Replaced: PYX
ID CLAYS QUESTIONABLE;
Leg : 92 Top/Bottom Interval(mm): 0/1350 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 86.85
Core: 6 Top of Core Depth (m) : 82.50
Sect: 3 Top of Section Depth(m): 85.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (0-40), 2 (40-57), 3 (58-65), 4 (65-71),
5 (75-86), 6 (89-111), 7 (115-125), 8 (125-131),
9 (132-135);
Texture : APHYRIC, MICROPHENOS OF FELDSPAR AND PYX, FINE TO
MEDIUM-GRAINED;
Structure : VEINS ARE COMMON ESPECIALLY IN PCES (1,2,5-6), AND
CA 1MM THICK AND FILLED WITH GREEN-YELLOW-RED SMEC
AND CALCITE, MASSIVE;
Alteration : MOD
IRREGULAR VARIATION DOWN SECTION ESPECIALLY NEXT
TO VEINS, ALTERATION IS OXIDATIVE WITH RED-BROWN
MATERIAL WHICH REPLACES PSEUDOMORPHED PYX, IN THE
LESS ALTERED PCES 2(BOTTOM)+3-4 THE ALTERATION
MINERALS (ZEOLITES? + SMEC?) ARE LIGHT YELLOW AND
LIGHT ORANGE, RED FE.OX HALOS NEAR VEINS;
Comments : NO IGNEOUS CONTACTS WITHIN SECTION;
Vesicles : Size(mm): 1-2 Percent: <<0.1
ALL FILLED WITH MATERIAL FROM LIGHT YELLOW TO
BROWN-RED, NO CALCITE;
Phenocrysts: RARE MICROPHENOS OF FELDSPAR AND PYX (2-3MM
ACROSS);
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES);
Replacement: OXIDES
ZEOLITE
SMECTITE
ID ZEOLITES AND SMECTITES UNCERTAIN;
FERROUS MN OXIDE
CALCITE
NEAR VEINS RED-BROWN IRON-OXIDES COMMON AND
SOMETIMES CALCITE;
Leg : 92 Top/Bottom Interval(mm): 0/1450 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 88.45
Core: 6 Top of Core Depth (m) : 82.50
Sect: 4 Top of Section Depth(m): 87.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1A (3-10), 1B (10-15), 1C (15-21), 1D (22-30),
1E (30-33), 1F (33-36), 1G (36-43), 1H (44-46),
1I (46-51), 1J (51-65), 1K (64-66), 1L (76-85),
1M (85-98), 1N (99-106), 1O (105-128), 2 (132-135),
3 (140-145);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED, MICROPHENOS OF PLAG
AND CPX;
Structure : VEINS ARE COMMON IN PCES 1A-N, IN PCES 1O+2+3 THEY
ARE RARE, SIZE IS <1MM TO 1.5MM THICK AND FILLED
WITH ZEOLITES AND DIFFERENT COLORED SMECTITES(?) AND
CALCITE, MASSIVE;
Alteration : MOD
VARIATIONS DOWN SECTION, REPLACEMENT OF PRIMARY
MINERALS BY ALTERATION MINERALS WITH DIFFERENT
COLORS FROM WHITE TO RED-BROWN, PCES 1A-E ARE
LIGHT BROWN-YELLOW MINERALS (ALSO FE.OX), PCES 1F-
1I BESIDES YELLOW-BROWN- LIGHT GREEN+DARK GREEN
MINERALS OCCUR, PCES 1F-O ONLY LIGHT-DARK GREEN
ALTERATION MINERALS NO BROWN COLORS BUT WHITE
ZEOLITES IN MATRIX, PCE 1O WITH ALTERATION FRONTS-
BOTTOM AND PCES 2-3 NO COLOURED ALTERATION
PRODUCTS & PCE 10(TOP) WITH LIGHT GREEN MINERALS,
FE.OX HALOS IN PCES 1A-E, COLOR OF SMECS IN VEINS
DEPENDS ON ALTERATION ZONE (WHITE, GREEN, RED-
BROWN);
Comments : NO IGNEOUS CONTACT WITHIN SECTION;
Vesicles : NEARLY NO VESICLES;
Phenocrysts: MICROPHENOS OF PLAG AND CPX (1-2MM ACROSS);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES);
Replacement: OXIDES
ZEOLITE
SOMETIMES WELL XSTLLIZED MINERALS OF ZEOLITES(?)
IN VEINS;
CALCITE
SMECTITE
ID SMEC UNCERTAIN AND DIFFERENT COLORED;
Leg : 92 Top/Bottom Interval(mm): 0/1470 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 89.97
Core: 6 Top of Core Depth (m) : 82.50
Sect: 5 Top of Section Depth(m): 88.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (1-9), 2 (12-18), 3 (22-29), 4A (32-41),
4B (40-55), 4C (47-55), 4D (51-55), 4E (55-65),
4F (66-71), 5A (74-77), 5B (77-89), 5C (89-97),
5D (98-110), 6 (111-118), 7 (123-126), 8 (134-136),
9 (140-146);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED, MICROPHENOS OF PLAG
AND CPX;
Structure : TRACE VEINS <1-2MM THICK, PCE 4B VEIN FILLED WITH
WHITE MINERALS (LESS CALCITE) & LIGHT BROWN FILLING
IN PCES 5B-5C, OTHERS FILLED WITH DARK GREEN
MATERIALS, PCE 5D SHOWS ONE SIDE OF A VEIN WITH
FILLING MATERIALS (MAYBE 2-3MM THICK) SOMETIMES WELL
CRYSTALLIZED PARTLY CALCITE;
Alteration : MOD
VARIATIONS DOWN SECTION, DIFFERENT ALTERATION
STAGES LIGHT GREEN TO DARK GREEN TO LIGHT BROWN TO
RED-BROWN, SOMETIMES BLUE-GREEN ALTERATION PRODUCT
(SMEC), FE.OX IN PCES 4A-F AND SOME CALCITE IS
COMMON;
Comments : NO IGNEOUS CONTACT WITHIN SECTION;
Vesicles : Size(mm): <1 Percent: <1
Location: Filling: FE.OX, SMEC
TRACE VESICLES FILLED WITH FE.OX OR DARK GREEN
SMEC(?), EMPTY VESICLE IN PCE 1 WITH CA 1% BY
VOLUME VUGS(?);
Phenocrysts: MICROPHENOS OF PLAG AND PYX (2-3MM ACROSS);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES);
Replacement: OXIDES
ALTERED MINERAL
Minerals Replaced: PYX
PSEUDOMORPHICAL REPLACEMENT OF PRIMARY MINERALS
(PYX) BY ALTERATION MINERALS;
CALCITE
FERROUS MN OXIDE
SMECTITE
ID SMEC UNCERTAIN IN VESICLES;
Leg : 92 Top/Bottom Interval(mm): 0/1400 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 92.90
Core: 7 Top of Core Depth (m) : 91.50
Sect: 1 Top of Section Depth(m): 91.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (0-16), 2A (19-38), 2B (39-45), 2C (46-63),
2D (64-86), 3A (89-96), 3B (96-124), 3C (120-140);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED, MICROPHENOS OF PLAG
AND CPX, SOME CHANGES IN GRAIN SIZE (E.G. PCE 2A-
BOTTOM IS FINE-GRAINED);
Structure : MASSIVE, VARIATIONS DOWN SECTION WITH RESPECT TO
FREQUENCY OF VEINS, VEINS ARE FILLED WITH GREEN OR
YELLOW-WHITE MINERALS;
Alteration : MOD
VARIATIONS WITHIN SECTION, ALTERATION FRONTS IN
PCES 2A+2D, CHANGE FROM LIGHT GREEN TO RED-LIGHT
BROWN (FE-OXIDES) ALTERED MATERIAL, VEIN FILLINGS
HAVE MOSTLY OXIDATIVE HALOS NEARBY;
Comments : NO IGNEOUS CONTACT WITHIN SECTION;
Vesicles : Size(mm): 1-2 Percent: <1
Location: Filling: SMEC
TRACE VESICLES FILLED WITH GREEN SMECTITE AND
SOMETIMES IN OXIDATION ZONES WITH BROWN MATERIAL;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
MICROPHENOS OF PLAG AND CPX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINERALOGY INCLUDES PLAG AND CPX (+ OXIDES);
Replacement: ALTERED MINERAL
Minerals Replaced: PYX
PSEUDOMORPHIC REPLACEMENT OF PYX BY LIGHT-DARK
GREEN ALTERATION MINERALS(?);
FERROUS MN OXIDE
OXIDES
SMECTITE
Leg : 92 Top/Bottom Interval(mm): 0/1450 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 94.45
Core: 7 Top of Core Depth (m) : 91.50
Sect: 2 Top of Section Depth(m): 93.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1A (2-14), 1B (15-33), 1C (32-56), 1D (55-63),
1E (64-72), 2 (74-77), 3A (80-87), 3B (81-91),
3C (92-104), 4A (106-115), 4B (115-127),
4C (127-144);
Texture : APHYRIC WITH MICROPHENOS OF PLAG AND PYX, FINE TO
MEDIUM-GRAINED WITH SOME CHANGES IN GRAIN SIZE
(ESPECIALLY PCES 1A+1E+4C WITH SOME FINE-GRAINED
PARTS);
Structure : RARE VEINS, WITH DARK GREEN AND SOME WITH LIGHT GREE
FILLING, COMMON LIGHT BROWN (FE OXIDES?) VEINS WITH
OXIDATION HALOS, MASSIVE;
Alteration : MOD
TRACE VARIATIONS DOWN SECTION, SOME LIGHT BROWN
ALTERATION MINERALS IN VICINITY OF SOME VEINS (FE-
OXIDES), OXIDATION HALOS ALSO NEAR FE-OXIDES IN
VICINITY OF VEINS;
Vesicles : Size(mm): CA 1 Percent: <0.1
TRACE VESICLES FILLED WITH LIGHT GREEN AND GREEN-
BLUE OPAQUE MINERALS;
Phenocrysts: PLAGIOCLASE
PYROXENE
MICROPHENOS OF PLAG AND PYX (CA 1-2MM ACROSS);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Replacement: ALTERED MINERAL
Minerals Replaced: PYX
PSEUDOMORPHIC REPLACEMENT OF PYX BY LIGHT GREEN
ALTERATION MINERALS (IN MATRIX AND PHENOS);
FERROUS MN OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/1500 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 96.00
Core: 7 Top of Core Depth (m) : 91.50
Sect: 3 Top of Section Depth(m): 94.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-16), 2 (19-27), 3 (30-36), 4 (40-47),
5 (50-54), 6 (56-63), 7 (65-68), 8 (73-75),
9 (76-79), 10 (83-85), 11 (89-91), 12 (94-96),
13 (99-104), 14 (106-112), 15 (116-126),
16 (130-140), 17 (144-150);
Texture : APHYRIC WITH TRACE MICROPHENOS OF FELDSPAR AND CPX,
FINE TO MEDIUM-GRAINED;
Structure : BESIDES SOME SMALL VEINS (CA 1MM THICK) FILLED WITH
GREEN-BLUE MATERIAL THERE ARE PARTS AND COMPLETE
VISIBLE VEINS (>1CM THICK) FILLED WITH YELLOW-BROWN
FINE-GRAINED MATERIAL AND MAINLY CALCITE AND SOME
AMORPHOUS MINERALS & MAY BE SOME FE-OXIDES (COLOR),
WITHIN THIS VEIN FILLING ARE SOME NOT IDENTIFIED
PARTICLES (1-2MM ACROSS) MAYBE SMECTITE AND SOME
DISSEMINATED NATIVE COPPER, PCE 2 HAS MAINLY VEIN
FILLING MATERIAL;
Alteration : MOD
BETWEEN VEIN AND BASALT (ONLY) SMALL REACTION
ZONES (<1MM) WITH GREEN-BLUE OR/AND RED-BROWN
ALTERATION MINERALS (MAINLY FE-OXIDES);
Comments : NO IGNEOUS CONTACTS WITHIN SECTION;
Vesicles : Size(mm): <1 Percent: <0.1
TRACE VESICLES FILLED WITH LIGHT GREEN MINERALS;
Phenocrysts: FELDSPAR
CLINOPYROXENE
TRACE MICROPHENOS OF FELDSPAR AND CPX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
COPPER
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES),
DISSEMINATED NATIVE COPPER IN VEINS;
Replacement: ALTERED MINERAL
Minerals Replaced: PYX
PSEUDOMORPHIC REPLACEMENT OF PYX BY LIGHT GREEN-
BLUE AND SOMETIMES RED-BROWN (FE-OXIDES?)
ALTERATION MINERALS;
CALCITE
FERROUS MN OXIDE
OXIDES
SMECTITE
Leg : 92 Top/Bottom Interval(mm): 0/1450 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 97.45
Core: 7 Top of Core Depth (m) : 91.50
Sect: 4 Top of Section Depth(m): 96.00
LITHOLOGY: PLAG SPARSELY MICROPHYRIC BASALT;
Piece No. : PCES 1 (1-12), 2 (14-30), 3 (32-36), 4A (39-50),
4B (39-46), 5 (53-59), 6 (63-67), 7 (72-75),
8A (78-88), 8B (89-99), 9 (101-106), 10A (109-122),
10B (124-125), 10C (125-130), 11 (132-145);
Texture : FINE TO MEDIUM-GRAINED, SPARSELY MICROPHYRIC;
Structure : SPARSE VEINS UP TO 1MM THICK, TYPICAL VEIN AT TOP OF
PCE 10A IS RIMMED BY YELLOW-BROWN CLAY MINERALS AND
HAS A CORE OF DARK GREEN CLAY MINERALS WHICH IS
MOTTLED DUE TO A DARK RED ALTERATION PRODUCT;
Alteration : MOD
BLUE-GREEN AND DARK GREEN PARTIAL TO COMPLETE
ALTERATION OF MANY CPX CRYSTALS AND IN PATCHES
ELSEWHERE, LOCAL ALTERATION OF GREEN CLAY TO
YELLOW-BROWN CLAY MINERALS, THE VEIN IN PCE 10A
IS SURROUNDED BY A 1.5CM BROWN ALTERATION HALO,
MOTTLING IN VEIN CORE DUE TO DARK RED ALTERATION
PRODUCT;
Comments : NO IGNEOUS CONTACT, COLOR IS GREY WITH BROWN
PATCHES;
Vesicles : ALMOST NON-VESICULAR;
Phenocrysts: PLAGIOCLASE ( 1-2%)
Size(mm): TO 2
SPARSE MICROPHENOS OF PLAGIOCLASE FELDSPAR;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
GROUNDMASS CONSISTS OF PLAG AND CPX (+ OXIDES);
Replacement: SULFIDE
SOMETIMES SULFIDES OCCUR AS TINY SCATTERED GRAINS
WITHIN THE CLAY MINERALS;
CLAY MINERALS
OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/ 960 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 98.46
Core: 7 Top of Core Depth (m) : 91.50
Sect: 5 Top of Section Depth(m): 97.50
LITHOLOGY: PLAG SPARSELY MICROPHYRIC BASALT;
Piece No. : PCES 1 (2-13), 2 (16-19), 3 (23-30), 4 (33-41),
5 (44-51), 6 (55-62), 7 (66-77), 8 (79-85),
9 (89-96);
Texture : FINE TO MEDIUM-GRAINED, SPARSELY MICROPHYRIC;
Structure : VERTICAL VEIN CONTAINING DARK GREEN CLAY MINERAL
FORMS THE LEFT HAND EDGE (AS DRAWN) OF PCES 3-5;
Alteration : MOD
MAIN ALTERATION PRODUCT IS BLUE-GREEN CLAY MINERAL
WHICH PARTIALLY TO TOTALLY PSEUDOMORPHS SOME PYX
AND OCCURS AS PATCHES ELSEWHERE;
Comments : NO IGNEOUS CONTACTS, COLOR IS GREY;
Vesicles : ALMOST NON-VESICULAR;
Phenocrysts: PLAGIOCLASE ( 3%)
Size(mm): 2-3
SPARSE MICROPHENOS OF PLAGIOCLASE FELDSPAR;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
GROUNDMASS CONSISTS OF PLAG AND CPX (+ OXIDES);
Replacement: CLAY MINERALS
Minerals Replaced: PYX
BLUE-GREEN CLAY MINERAL WHICH PARTIALLY TO TOTALLY
PSEUDOMORPHS SOME PYX;
OXIDE
CLAY
Leg : 92 Top/Bottom Interval(mm): 0/1380 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 101.88
Core: 8 Top of Core Depth (m) : 100.50
Sect: 1 Top of Section Depth(m): 100.50
LITHOLOGY: CPX SPARSELY MICROPHYRIC BASALT;
Piece No. : PCES 1A (1-40), 1B (40-50), 2A (52-114),
2B (110-138);
Texture : SPARSELY MICROPHYRIC, FINE TO MEDIUM-GRAINED;
Structure : VEINS ARE RARE- MOST COMMON AT THE BASE OF PCE 1
WHERE THEY CONTAIN PALE GREEN- COLORLESS BOTRYOIDAL
CALCITE AND A BLACK MATERIAL (MNO2?, SMECTITE?);
Alteration : SLIGHTLY
LOCAL ZONES OF OXIDATIVE ALTERATION BUT FRESHEST
IN CORE SO FAR, BROWN STAIN ON FELDSPARS IN
OXIDATIVE ZONE;
Comments : NO IGNEOUS CONTACTS, GREY COLOR;
Vesicles : ALMOST NON-VESICULAR;
Phenocrysts: CLINOPYROXENE ( 3%)
Size(mm): 2-4
SPARSE MICROPHENOS AND GLOMEROCRYSTS OF SUBHEDRAL
CPX;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
GROUNDMASS OF PLAG AND CPX (+ OXIDES);
PYROXENE
PYX LITTLE ALTERED;
Replacement: OXIDES
CALCITE
BOTRYOIDAL;
SMECTITE
ID SMECTITE UNCERTAIN- COULD BE MNO2(?);
Leg : 92 Top/Bottom Interval(mm): 0/1460 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 103.46
Core: 8 Top of Core Depth (m) : 100.50
Sect: 2 Top of Section Depth(m): 102.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1A (2-38), 1B (35-59), 1C (59-146);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED, SPARSE MICROPHENOS
OF CPX;
Structure : RARE VEINS UP TO 1MM ACROSS, VEIN AT 30-35CM IS MOST
INTERESTING AND CONTAINS PALE GREEN WAXY AMORPHOUS
SMECTITE(?) AND CALCITE, VEIN MARKING 1A-B CONTACT
CONTAINS BLACK MNO2 AND BROWN IRON OXIDE (? OR SMEC)
Alteration : SLIGHTLY
A FEW PATCHES OF OXIDATIVE ALTERATION IN THE TOP
40CM AND A VERY SMALL PROPORTION OF CLAY MINERALS
THROUGHOUT;
Comments : NO IGNEOUS CONTACTS, HOMOGENEOUS GREY;
Vesicles : NON-VESICULAR;
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): 2-3
SPARSE (1% OR LESS) MICROPHENOS OF CPX;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
GROUNDMASS IS PLAG AND CPX (+ OXIDE);
Replacement: OXIDE
CLAY
FERROUS OXIDE
SMECTITE
ID SMEC UNCERTAIN IN VEIN FILLING;
Leg : 92 Top/Bottom Interval(mm): 0/1450 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 104.95
Core: 8 Top of Core Depth (m) : 100.50
Sect: 3 Top of Section Depth(m): 103.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (2-39), 2A (41-52), 2B (54-60), 3 (63-67),
4 (71-73), 5 (75-79), 6 (80-84), 7A (86-98),
7B (95-100), 8A (103-106), 8B (105-114),
9A (115-127), 9B (127-145);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED WITH A VERY SLIGHT
COARSENING OF GRAIN SIZE FROM TOP TO BOTTOM OF THE
SECTION, MARKED VARIOLITIC TEXTURE IN WHICH
SPHERICAL VARIOLES ARE SURROUNDED BY LARGER GRAINS
OF PLAG AND CPX IN INTERSERTAL RELATIONSHIP;
Structure : RARE VEINS, ONLY ONE SIGNIFICANT VEIN AT 4CM BETWEEN
PCES 1+2A, FILLING IS BLUE CLAY MINERAL AND BLACK
MN-OXIDE(?) AND BROWN IRON-OXIDE(?);
Alteration : FRESH TO SLIGHT
FAIRLY FRESH IN THE FIRST AND LAST 30CM AND
ELSEWHERE SLIGHT, IRREGULAR OXIDATIVE ALTERATION,
INCLUDING MINOR ALTERATION FRONTS, OXIDATIVE ZONES
CONTAIN MINOR YELLOW-BROWN IRON-OXIDE (+ SMECTITE?
AND ZEOLITE?), A SMALL DEGREE OF ALTERATION
MINERALS EXISTS, VEIN AT 4CM CARRIES A 5CM-WIDE
ALTERATION HALO;
Comments : NO IGNEOUS CONTACT, GREY WITH BROWN PATCHES;
Vesicles : NON-VESICULAR;
Phenocrysts: CLINOPYROXENE
VERY SPARSE CPX PHENOS;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
GROUNDMASS OF PLAG AND CPX (+ OXIDES);
Replacement: OXIDES
SMECTITE
ID SMECTITE UNCERTAIN ;
FERROUS OXIDE
ID BROWN FE.OXIDE UNCERTAIN AS VEIN FILLING;
MANGANESE OXIDE
ID BLACK MN.OXIDE UNCERTAIN AS VEIN FILLING;
ZEOLITE
ID ZEOLITE UNCERTAIN;
Leg : 92 Top/Bottom Interval(mm): 0/1200 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 106.20
Core: 8 Top of Core Depth (m) : 100.50
Sect: 4 Top of Section Depth(m): 105.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (2-15), 2 (16-19), 2A (22-30), 2B (31-35),
2C (35-53), 3 (55-60), 4 (62-73), 5A (75-90),
5B (90-106), 5C (106-120);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED, TEXTURES AS IN 8.3;
Structure : RARE VEINS CONTAIN DARK GREEN CLAY MINERAL (<1MM
THICK) WITH VERY MINOR RED AND YELLOW-BROWN OXIDE(?)
IN PCE 5A, CONTAINS ABUNDANT YELLOW-BROWN OXIDE(?)
IN PCE 2C TOGETHER WITH MINOR CALCITE & ZEOLITE(?);
Alteration : MOD
SLIGHT INCREASE IN ALTERATION OF 8-3, OXIDATIVE
ALTERATION ZONES MAINLY AROUND VEINS MARKED BY
REPLACEMENT OF GREEN CLAY MINERAL BY YELLOW-BROWN
CLAY MINERAL (OR IRON-OXIDES) AND POSSIBLY BY
REPLACEMENT OF FELDSPAR BY ZEOLITE;
Comments : NO IGNEOUS CONTACTS, GREY WITH BROWN PATCHES;
Vesicles : ALMOST NON-VESICULAR;
Replacement: CLAY
REPLACEMENT OF GREEN CLAY MINERAL BY YELLOW-BROWN
CLAY MINERAL (OR IRON OXIDE?);
ZEOLITE
Minerals Replaced: FELDSPAR
POSSIBLE REPLACEMENT OF FELDSPAR BY ZEOLITE AROUND
VEINS, ID ZEOLITE UNCERTAIN IN PCE 2C;
OXIDE
ID YELLOW-BROWN OXIDE UNCERTAIN;
FERROUS MN OXIDE
ID FE.OX UNCERTAIN AS YELLOW-BROWN CLAY.MIN;
CALCITE
MINOR;
Leg : 92 Top/Bottom Interval(mm): 0/1240 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 107.74
Core: 8 Top of Core Depth (m) : 100.50
Sect: 5 Top of Section Depth(m): 106.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1A (2-11), 1B (10-25), 1C (25-40), 1D (41-56),
1E (57-77), 1F (77-84), 2 (86-94), 3 (96-108),
4 (110-113), 5 (116-124);
Texture : APHYRIC WITH TRACE MICROPHENOS OF PYX, FINE TO MEDIU
GRAINED;
Structure : ALMOST NO VEINS DOWN SECTION EXCEPT PCES 3+5, PCE 3
HAS ONE VEIN FILLED WITH LIGHT GREEN MATERIAL AND
ONE VEIN FILLED WITH CALCITE, PCE 5 HAS ONE VEIN
FILLED WITH GREEN ALTERATION MATERIAL AND NEAR THIS
PYRITE OCCURS, MASSIVE;
Alteration : SLIGHT TO MODERATE
VARIATIONS DOWN SECTION, ALTERATION FRONT IN PCE
1B, PCES 3+5 ARE MORE ALTERED THAN 1C-2+4 BUT NO
BROWN COLORED ALTERATION MINERALS, IN PCES 1C-2+4
COMMON LIGHT TO DARK GREEN ALTERATION PRODUCTS;
Comments : NO IGNEOUS CONTACT DOWN SECTION, GREY WITH BROWN
PATCHES IN PCES 1A-B;
Vesicles : ALMOST NON-VESICULAR;
Phenocrysts: PYROXENE
TRACE MICROPHENOS OF PYX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES);
Replacement: PCES 1A+3(TOP) HAVE BROWN-RED ALTERATION MINERALS
PSEUDOMORPHING PYX AND IN PCES 1C-2+4 LIGHT TO
DARK GREEN ALTERATION PRODUCTS ALSO PSEUDOMORPHING
PYX (SMECTITE?);
SMECTITE
ID SMECTITE UNCERTAIN;
PYRITE
<0.1MM ACROSS IN PCE 5;
OXIDES
CALCITE
Leg : 92 Top/Bottom Interval(mm): 0/1440 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 109.44
Core: 8 Top of Core Depth (m) : 100.50
Sect: 6 Top of Section Depth(m): 108.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1A (2-21), 1B (21-36), 1C (34-42), 1D (42-47),
1E (47-61), 1F (62-73), 1G (73-76), 2A (79-87),
2B (87-94), 3 (96-105), 4 (107-112), 5 (114-121),
6 (123-129), 7 (131-144);
Texture : APHYRIC WITH TRACE MICROPHENOS OF PYX AND PLAG, FINE
TO MEDIUM-GRAINED;
Structure : MASSIVE FLOW, ALMOST NO VEINS DOWN SECTION;
Alteration : SLIGHT
PCES 1A-F ARE SLIGHTLY ALTERED WITH LIGHT GREEN
ALTERATION MINERALS (CLAY) PSEUDOMORPHING PYX,
NEARLY NO FE-OXIDES AS ALTERATION PRODUCT;
MOD
PCES 1G-7 ARE MODERATELY ALTERED WITH VARIATIONS
WITHIN SECTION, THERE IS PATCHY BROWN TO RED-
BROWN IRON-OXIDES AS ALTERATION MINERALS AND
SMECTITE PSEUDOMORPHING PYX, LESS GREEN COLORED
MINERALS;
Comments : NO IGNEOUS CONTACT WITHIN SECTION, GREY WITH BROWN
PATCHES IN PCES 1G-7 ONLY;
Vesicles : ALMOST NON-VESICULAR;
Phenocrysts: PYROXENE
PLAGIOCLASE
TRACE MICROPHENOS OF PYX AND PLAG;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES +
SULPHIDES?);
Replacement: PYRITE
DISSEMINATED FINE-GRAINED PYRITE (<0.1MM ACROSS)
IN PCES 1A-I, PYRITE DISAPPEARS IN PCES 1G-7;
PSEUDOMORPHING OF PYX IN PCES 1A-I BY LIGHT GREEN
ALTERATION MINERALS AND IN PCES 1G-7 BY PATCHY
BROWN TO RED-BROWN FE-OXIDES AND SMECTITE;
ZEOLITE
SOMETIMES REPLACEMENT OF FELDSPAR BY ZEOLITE
WITHIN SECTION;
SMECTITE
Minerals Replaced: PYX
FERROUS OXIDE
Minerals Replaced: PYX
ALTERED MINERAL
Minerals Replaced: PYX
SULFIDE
ID SULFIDE IN GNDMASS UNCERTAIN;
Leg : 92 Top/Bottom Interval(mm): 0/1300 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 110.80
Core: 8 Top of Core Depth (m) : 100.50
Sect: 7 Top of Section Depth(m): 109.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1A (1-14), 1B (15-22), 1C (23-31), 1D (32-41),
2 (44-45), 3 (48-51), 4 (55-59), 5 (62-65),
6 (67-71), 7 (73-79), 8 (82-94), 9 (96-102),
10 (105-111), 11 (114-119), 12 (121-130);
Texture : APHYRIC WITH RARE MICROPHENOS OF PYX AND PLAG, FINE
TO MEDIUM-GRAINED;
Structure : MASSIVE FLOW, ALMOST NO VEINS EXCEPT PCE 11 WHICH IS
FILLED WITH CALCITE;
Alteration : SLIGHT
PCES 1-2+4-6 ARE SLIGHTLY ALTERED WITH LIGHT GREEN
TO BLUE ALTERATION MINERALS (CLAY, SMECTITE?)
PSEUDOMORPHING PYX, NO IRON-OXIDES;
MOD
PCES 3+7-12 WITH VARIATIONS WITHIN SECTION, PATCHY
LIGHT BROWN IRON-OXIDES, SMECTITE(?) AND CLAY ARE
POSSIBLE RED-BROWN ALTERATION MINERALS
PSEUDOMORPHING PYX, OXIDATION HALO NEXT TO VEIN IN
PCE 11;
Phenocrysts: PLAGIOCLASE
Size(mm): 1-2
PYROXENE
Size(mm): 1-2
RARE MICROPHENOS OF PLAG AND PYX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES PLAG AND CPX (+ OXIDES);
Replacement: CLAY MINERALS
Minerals Replaced: PYX
ALTERED MINERAL
Minerals Replaced: PYX
SMECTITE
Minerals Replaced: PYX
PCES 1-2+4-6 LIGHT GREEN-BLUE ALTERATION MINERALS
(CLAY, SMECTITE?) PSEUDOMORPHING PYX AND IN PCES
3+7-12 PATCHY LIGHT BROWN FE-OXIDES (SMECTITE?)
AND CLAY RED-BROWN ALTERATION MINERALS
PSEUDOMORPHING PYX;
PYRITE
(<0.1MM ACROSS+<0.1% BY VOLUME) OF DISSEMINATED
FINE-GRAINED PYRITE(?)(SULFIDE MINERALS),
PYRITE RARE IN PCES 3+7-12;
SULFIDE
ZEOLITE
Minerals Replaced: FELDSPAR
REPLACEMENT OF FELDSPAR BY ZEOLITE DOWN SECTION;
CALCITE
FERROUS OXIDE
Minerals Replaced: PYX
Leg : 92 Top/Bottom Interval(mm): 0/1460 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 110.96
Core: 9 Top of Core Depth (m) : 109.50
Sect: 1 Top of Section Depth(m): 109.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (0-19), 2A (22-34), 2B (35-47), 3 (51-54),
4A (58-71), 4B (70-80), 4C (79-86), 4D (85-100),
5 (103-110), 6A (112-123), 6B (123-132),
6C (132-136);
Texture : APHYRIC WITH TRACE MICROPHENOS OF PYX AND PLAG,
MEDIUM-GRAINED;
Structure : MASSIVE FLOW, TRACE VEINS EXCEPT PCES 4A-B, IN PCE
4A THEY ARE 1-1.5MM THICK AND FILLED WITH GREEN-
BLUE MATERIAL (CELADONITE ?) AND SOMETIMES CALCITE;
Alteration : SLIGHT
PCES 2B+4C-D+6A-C ARE SLIGHTLY ALTTERED WITH
SOMETIMES LIGHT GREEN ALTERATION MINERALS (SMEC?)
PSEUDOMORPHING MATRIX PYX;
MOD
PCES 1+2A+3+4A-B+5 ARE MODERATELY ALTERED WITH
PATCHY LIGHT BROWN IRON-OXIDES AND CLAY MINERALS
PSEUDOMORPHING PYX;
ALTERATION FRONTS IN PCES 2A-B+3A-C+6A, ALTERATION
NEAR VEINS ALWAYS MORE INTENSIVE;
Comments : NO IGNEOUS CONTACT DOWN SECTION, GREY WITH BROWN
PATCHES WITHIN SECTION;
Alteration : MOD
PCES 1+2A+3+4A-B+5 ARE MODERATELY ALTERED WITH
PATCHY LIGHT BROWN IRON-OXIDES AND CLAY MINERALS
PSEUDOMORPHING PYX;
ALTERATION FRONTS IN PCES 2A-B+3A-C+6A, ALTERATION
NEAR VEINS ALWAYS MORE INTENSIVE;
Comments : NO IGNEOUS CONTACT DOWN SECTION, GREY WITH BROWN
PATCHES WITHIN SECTION, REENTRY AFTER BIT CHANGE!
Vesicles : ALMOST NON-VESICULAR;
Phenocrysts: PLAGIOCLASE
Size(mm): 1-3
PYROXENE
Size(mm): 1-3
TRACE MICROPHENOS OF PLAG AND PYX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES PLAG AND CPX (+ OXIDES);
Replacement: OXIDES
PYRITE
(<0.1MM ACROSS) IN PCE 5;
LIGHT GREEN ALTERATION MINERALS (SMECTITE) IN PCES
( 6A-C%)
Size(mm): PSEUDOMOR
Minerals Replaced: PHING MATRIX PYX AND IN PCES
(A-B+5%)
Size(mm): PATCHY LI
Minerals Replaced: GHT BROWN IRON-OXIDES AND
CLAY MIN (ERALS%)
Size(mm): PSEUDOMOR
Minerals Replaced: PH PYX;
CLAY MINERALS
Minerals Replaced: PYX
FERROUS OXIDE
Minerals Replaced: PYX
ALTERED MINERAL
Minerals Replaced: PYX
CALCITE
SOMETIMES CALCITE NEAR VEINS;
Leg : 92 Top/Bottom Interval(mm): 0/ 910 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 111.91
Core: 9 Top of Core Depth (m) : 109.50
Sect: 2 Top of Section Depth(m): 111.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW, SAME AS 9-1;
Piece No. : PCES 1A (3-12), 1B (13-26), 1C (25-26), 2 (29-39),
3 (43-48), 4A (43-66), 4B (66-80), 4C (80-91);
Structure : VEINS ARE RARE AND FILLED WITH BROWN CLAY MINERALS
PCE 1B OR GREEN SMECTITE(?) PCE 4C, MASSIVE;
Alteration : SLIGHT TO MODERATE
PCES 1C+3+4B-C ARE MODERATELY ALTERED, VARIATION
BETWEEN NEARLY FRESH BASALT AND SLIGHT ALTERATION
WITH LIGHT GREEN ALTERATION MINERALS
PSEUDOMORPHING MATRIX PYROXENE, PCES 1B(BOTTOM)+
1C+3+4B-C WITH PATCHY BROWN IRON-OXIDES AND CLAY
MINERALS, ALTERATION FRONT PCES 4B-C, ALTERATION
HALOS NEXT TO VEINS;
Comments : NO IGNEOUS CONTACT DOWN SECTION;
Vesicles : Size(mm): Percent: 0
Groundmass : PYROXENE
MATRIX PYX IS PSEUDOMORPHED;
Replacement: CLAY
SMECTITE
ID GREEN SMECTITE IN PCE 4C UNCERTAIN;
FERROUS OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/1430 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 113.93
Core: 9 Top of Core Depth (m) : 109.50
Sect: 3 Top of Section Depth(m): 112.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW, SAME AS 9-1+9-2;
Piece No. : PCES 1A (4-31), 1B (31-45), 1C (48-66), 1D (65-71),
1E (71-84), 1F (83-99), 2 (102-116), 3A (119-127),
3B (128-133), 3C (134-143);
Texture : APHYRIC;
Structure : VEINS ARE RARE EXCEPT PCES 1A-B, PCES 1A HAS A 1-3MM
THICK VEIN FILLED WITH GREEN-BLUE CLAY MINERALS
(SMECTITE+SOME CELADONITE BUT NO CALCITE OR FE.OX),
VEIN <1MM THICK SAME FILLING AS PCE 1A, MASSIVE;
Alteration : SLIGHT
PCES 1A-C ARE SLIGHTLY ALTERED BUT NO STRONG
ALTERATION NEXT TO LARGE VEIN IN PCE 1A;
MOD
PCES 1D-3C ARE MODERATELY ALTERED WITH BROWN-RED-
BROWN CLAY MINERALS AND FE-OXIDES, ALTERATION
FRONTS IN PCES 1F+3A-C SHOWING THE ABOVE DESCRIBED
ALTERATION FRONTS;
Vesicles : ALMOST NON-VESICULAR;
Groundmass : PYROXENE
MATRIX PYX IS PSEUDOMORPHED;
Replacement: CLAY MINERALS
Minerals Replaced: PYX
ALTERED MINERAL
Minerals Replaced: PYX
SMECTITE
CELADONITE
FERROUS OXIDE
Minerals Replaced: PYX
NONE PRESENT IN VEINS;
IN PCES 1A-C GREEN ALTERATION MINERALS SOMETIMES
PSEUDOMORPH MATRIX PYX AND IN PCES 1D-3C CLAY
MINERALS AND FE-OXIDES SOMETIMES PSEUDOMORPH
PRIMARY MINERALS;
Leg : 92 Top/Bottom Interval(mm): 0/1310 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 115.31
Core: 9 Top of Core Depth (m) : 109.50
Sect: 4 Top of Section Depth(m): 114.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (2-18), 2 (22-39), 3A (41-48), 3B (42-47),
4A (52-61), 4B (62-66), 4C (66-77), 4D (77-96),
4E (97-110), 4F (110-121), 4G (121-131);
Texture : APHYRIC WITH RARE MICROPHENOS OF FELDSPAR AND CPX,
FINE TO MEDIUM-GRAINED BASALT WITH A SLIGHT
COARSENING OF GRAIN SIZE FROM TOP TO BOTTOM OF THE
SECTION;
Structure : VEINS ARE COMMON WITHIN SECTION, PCE 1 HAS GREEN
SMECTITE FILLING AND NO CELAD (XRD) NOR CALCITE BUT
MAYBE SOME ZEOLITE (1-2MM THICK), ALL OTHER VEINS
<1MM THICK WITH GREEN ALTERATION MINERALS, MASSIVE;
Alteration : SLIGHT TO MODERATE
PCES 1-4A SHOW NORMAL OXIDATIVE ALTERATION WITH
LIGHT BROWN ALTERATION MINERALS AND SOME FE-OXIDES
REPLACING PYX PSEUDOMORPHICALLY;
FRESH
REST OF CORE (EXCEPT PCE 1-4A) IS ALMOST FRESH
BASALT AND ONLY IN VICINITY OF VEINS ARE ALTERATIO
FRONTS OF A FEW CM'S, VEINS HAVE ALTERATION HALO
NEXT TO THEM;
Comments : NO IGNEOUS CONTACT WITHIN SECTION, GREY WITH BROWN
PATCHES NEXT TO VEINS;
Vesicles : Size(mm): Percent: 0
Phenocrysts: FELDSPAR
CLINOPYROXENE
RARE MICROPHENOS OF FELDSPAR AND CPX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES);
Replacement: OXIDES
FERROUS OXIDE
Minerals Replaced: PYX
ALTERED MINERAL
Minerals Replaced: PYX
PCES 1-4A HAVE LIGHT BROWN ALTERATION MINERALS AND
SOME FE-OXIDES REPLACING PYX PSEUDOMORPHICALLY;
SMECTITE
ZEOLITE
MAYBE SOME ZEOLITE (1-2MM THICK);
Leg : 92 Top/Bottom Interval(mm): 0/1350 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 119.85
Core: 10 Top of Core Depth (m) : 118.50
Sect: 1 Top of Section Depth(m): 118.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1 (2-12), 2 (14-20), 3A (22-25), 3B (26-30),
4 (33-41), 5 (43-50), 6 (53-61), 7 (63-71),
8 (74-85), 9A (88-105), 9B (106-117), 9C (117-125),
9D (125-135);
Texture : FINE TO MEDIUM-GRAINED BASALT WITH A SLIGHT
INCREASING OF GRAIN SIZE FROM TOP TO BOTTOM, APHYRIC
WITH TRACE MICROPHENOS OF PLAG AND PYX;
Structure : MASSIVE, VEINS ARE COMMON IN PCES 1-4 WITH DARK
GREEN SMECTITE VEIN FILLING BUT NO CALCITE, PCE 3B
SHOWS VEIN FILLING ON ITS TOP SIDE;
Alteration : FRESH TO SLIGHT
PCES 1-6 WITH LIGHT BROWN ALTERATION MINERALS BUT
NO COMPLETE ALTERATION OF PRIMARY MINERALS, PCES
7-9D ARE FRESH (ALMOST) WITH SOME WEAK ALTERATION
FRONTS NEAR VEINS, PCE 9B HAS LIGHT GREEN
ALTERATION MINERALS;
Comments : NO IGNEOUS CONTACT DOWN SECTION, GREY WITH BROWN
PATCHES WITHIN SECTION;
Vesicles : Size(mm): Percent: 0
Phenocrysts: PLAGIOCLASE
Size(mm): 1-2
CLINOPYROXENE
Size(mm): 1-2
RARE MICROPHENOS OF PLAG AND CPX;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES);
Replacement: OXIDES
SMECTITE
Leg : 92 Top/Bottom Interval(mm): 0/1400 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 121.40
Core: 10 Top of Core Depth (m) : 118.50
Sect: 2 Top of Section Depth(m): 120.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW;
Piece No. : PCES 1A (2-10), 1B (10-19), 1C (18-22), 1D (20-27),
1E (27-50), 1F (51-60), 1G (60-80), 1H (80-124),
1I (124-139);
Texture : FINE TO MEDIUM-GRAINED BASALT, APHYRIC WITH TRACE
MICROPHENOS OF PLAG AND PYX AND OXIDES(?);
Structure : MASSIVE, VEINS ARE RARE AND CORE MAY BE BROKEN AT
VEINS;
Alteration : MOD
ALTERATION FRONTS ARE COMMON WITH A ZONE OF LIGHT
BROWN TO RED-BROWN CLAYS AND FE-OXIDES ESPECIALLY
NEAR VEINS, OXIDATIVE ALTERATION HALOS NEXT TO
VEINS AND SOMETIMES TRACES OF CALCITE;
Comments : NO IGNEOUS CONTACT DOWN SECTION, GREY WITH DARK GREY
AND BROWN PATCHES WITHIN SECTION;
Vesicles : ALMOST NON-VESICULAR;
Phenocrysts: FELDSPAR
Size(mm): CA 2
PYROXENE
Size(mm): CA 2
RARE MICROPHENOS OF FELDSPAR & PYX & OXIDES(?);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MINEROLOGY INCLUDES CPX AND PLAG (+ OXIDES);
Replacement: OXIDES
SMECTITE
ZEOLITE
Minerals Replaced: PLAG,PYX
ALTERED MINERAL
Minerals Replaced: PLAG,PYX
PSEUDOMORPHIC REPLACEMENT OF PLAG AND PYX BY
USUALLY LIGHT GREEN ALTERATION MINERALS (SMEC ?)
AND SOMETIMES ZEOLITE- 40-50% OF MATRIX AND PHENOS
AFFECTED;
PYRITE
SOME TRACES OF PYRITE OCCURS;
CLAY
CALCITE
SOMETIMES TRACES OF CALCITE AROUND VEINS;
FERROUS OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/1360 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 122.86
Core: 10 Top of Core Depth (m) : 118.50
Sect: 3 Top of Section Depth(m): 121.50
LITHOLOGY: APHYRIC BASALT;
SAME AS 10-2;
Piece No. : PCES 1A (2-16), 1B (14-16), 1C (15-26), 1D (26-50),
1E (50-63), 1F (63-80), 1G (80-109), 1H (109-126),
1I (125-136);
Texture : APHYRIC;
Structure : VEINS ARE TRACE AND ONLY PCES 1A-C ARE WITH GREEN
ALTERATION MINERALS AS FILLING AND WITH CALCITE;
Alteration : SLIGHTLY TO MODERATE
VARIATION DOWN SECTION, OXIDATIVE ALTERATION ONLY
IN PCES 1A-C+F;
Vesicles : ALMOST NON-VESICULAR, THREE VESICLES IN PCE 1A ARE
FILLED WITH BROWN FE-OXIDES OR CLAY;
Replacement: FERROUS OXIDE
CLAY
CALCITE
Leg : 92 Top/Bottom Interval(mm): 0/1380 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 124.38
Core: 10 Top of Core Depth (m) : 118.50
Sect: 4 Top of Section Depth(m): 123.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW, SAME AS 10-2 AND 10-3;
Piece No. : PCES 1A (2-30), 1B (30-41), 1C (42-56), 1D (57-67),
1E (68-80), 2A (85-106), 2B (106-116), 2C (119-121),
2D (120-138);
Texture : APHYRIC;
Structure : MASSIVE, NO VEINS;
Alteration : SLIGHT TO MODERATE
ALTERATION WITH VERY TRACE VARIATION DOWN SECTION,
NO FE-OXIDES AS ALTERATION MINERALS;
Comments : NO IGNEOUS CONTACT DOWN SECTION;
Vesicles : ALMOST NON-VESICULAR;
Replacement: ALTERED MINERAL
Minerals Replaced: PLAG,PYX
PSEUDOMORPHIC REPLACEMENT OF PLAG AND PYX BY
YELLOW-WHITE TO LIGHT GREEN ALTERATION MINERALS;
PYRITE
TRACE PYRITE IN PCES 1A-2B;
Leg : 92 Top/Bottom Interval(mm): 0/1350 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 125.85
Core: 10 Top of Core Depth (m) : 118.50
Sect: 5 Top of Section Depth(m): 124.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW, SAME AS 10-2 AND 10-3 AND 10-4;
Piece No. : PCES 1A (2-21), 1B (21-42), 1C (43-53), 1D (54-76),
1E (77-90), 1F (90-103), 1G (104-115), 1H (115-135);
Texture : APHYRIC;
Structure : MASSIVE, ALMOST NO VEINS;
Alteration : SLIGHT TO MODERATE
ALTERATION WITH TRACE VARIATION DOWN SECTION,
OXIDATIVE ALTERATION ONLY IN PCES 1G+1H WITH
SLIGHT ALTERATION FRONTS;
Comments : NO IGNEOUS CONTACT WITHIN SECTION;
Vesicles : ALMOST NON-VESICULAR;
Replacement: PYRITE ( 0%)
Leg : 92 Top/Bottom Interval(mm): 0/1150 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 127.15
Core: 10 Top of Core Depth (m) : 118.50
Sect: 6 Top of Section Depth(m): 126.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW, SAME AS 10-2 THRU 10-5;
Piece No. : PCES 1A (2-15), 1B (15-30), 1C (30-41), 1D (42-47),
1E (50-60), 1F (59-66), 1G (66-76), 1H (76-90),
1I (91-103), 1J (91-115);
Texture : APHYRIC;
Structure : MASSIVE, CORE USUALLY BROKEN AS VEINS, VEINS FILLED
WITH LIGHT TO DARK GREEN CLAY MINERAL (CHLORITE),
VEINS MAY BE CA 1MM THICK;
Alteration : SLIGHT TO MODERATE
VARIATIONS DOWN SECTION, ALTERATION FRONTS ARE
COMMON WITH PATCHY BROWN TO RED-BROWN CLAYS AND
FE-OXIDES ESPECIALLY NEAR VEINS, SOMETIMES LIGHT
BROWN TO YELLOW COLOR OF THE ALTERATION MINERALS,
NEAR VEINS OXIDATIVE ALTERATION ZONE SOMETIMES A
FEW CM'S;
Comments : NO IGNEOUS CONTACT DOWN SECTION;
Vesicles : ALMOST NON-VESICULAR;
Replacement: ALTERED MINERAL
Minerals Replaced: PLAG,PYX
PSEUDOMORPHIC REPLACEMENT OF PLAG AND PYX BY
USUALLY LIGHT GREEN ALTERATION MINERALS (SMEC?)-
30-40% OF MATRIX AND PHENOS ARE AFFECTED;
SMECTITE
CLAY
CHLORITE
FERROUS OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/ 920 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 128.42
Core: 10 Top of Core Depth (m) : 118.50
Sect: 7 Top of Section Depth(m): 127.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE FLOW, SAME AS 10-2 THRU 10-6;
Piece No. : PCES 1A (2-18), 1B (20-34), 1C (34-48), 1D (49-57),
1E (55-63), 1F (64-70), 1G (70-80), 1H (80-87),
1I (85-92);
Texture : APHYRIC;
Structure : MASSIVE, SAME AS 10-6;
Alteration : SAME AS 10-6 BUT MAY BE LESS BROWN PATCHES DOWN
SECTION;
Comments : NO IGNEOUS CONTACT DOWN SECTION;
Vesicles : Size(mm): Percent: 0
Leg : 92 Top/Bottom Interval(mm): 0/1350 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 128.85
Core: 11 Top of Core Depth (m) : 127.50
Sect: 1 Top of Section Depth(m): 127.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (2-7), 2A (8-27), 2B (26-41), 2C (40-60),
2D (60-82), 2E (83-91), 2F (92-105), 2G (106-127),
2H (126-135);
Texture : APHYRIC BUT OCCASIONAL GLOMEROCRYSTS OF FELDSPAR,
OPHITIC TEXTURE- ROCK IS DOTTED WITH LARGE CPX
ENCLOSING FELDSPAR, MEDIUM-GRAINED;
Structure : NO VEINS WITHIN FRAGMENTS BUT ALL FRAGMENT
BOUNDARIES FORM ALONG VEINS, MAIN VEIN FILLING IS
DARK GREEN-BLACK CLAY MINERAL (+/- MNO2?), SOME HAVE
ADDITIONAL CALCITE AND BROWN FE-OXIDE/CLAY AND THESE
ALSO HAVE BROWN OXIDATIVE ZONE;
Alteration : SLIGHT
WEAK ALTERATION OF PYX AND GNDMASS BY BLUE-GREEN
TO GREEN CLAY MINERALS, WEAK SUPERIMPOSED
OXIDATIVE ALTERATION TO YELLOW-BROWN OXIDE/CLAY IN
ALTERATION ZONES AROUND SOME VEINS ESPECIALLY PCES
2A-B;
Comments : NO IGNEOUS CONTACTS, UNIFORM GREY COLOR;
Vesicles : ALMOST NON-VESICULAR;
Groundmass : CLINOPYROXENE
FELDSPAR
ONLY MAJOR MINERALS;
Replacement: CLAY
COULD BE MNO2? WITH CLAY;
CALCITE
FERROUS OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/1450 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 130.45
Core: 11 Top of Core Depth (m) : 127.50
Sect: 2 Top of Section Depth(m): 129.00
LITHOLOGY: APHYRIC BASALT;
SIMILAR TO 11-1;
Piece No. : PCES 1A (2-11), 1B (12-31), 1C (31-60), 1D (60-72),
1E (69-85), 1F (85-96), 2 (98-120), 3 (123-145);
Texture : APHYRIC, SAME AS 11-2- MEDIUM-GRAINED HOMOGENEOUS
BASALT WITH AN OPHITIC TEXTURE;
Structure : VEINS ARE DARK GREY CLAY AND CALCITE +/- BROWN FE-
OXIDE/CLAY ARE THE COMMON PRODUCTS, ALL PCES ARE
RIMMED BY VEIN-FILLING AND MOST VEINS HORIZONTAL;
Alteration : FRESH
FRESH EXCEPT FOR ALTERATION OF PYX AND FINE-
GRAINED MATRIX BY GREEN TO BLUE-GREEN CLAY,
OXIDATIVE ALTERATION ZONES ARE COMMON AROUND
FRACTURES IN PCE 1, YELLOW-BROWN OXIDE/CLAY THE
COMMON PRODUCT;
Comments : MATRIX IS FINE-GRAINED;
Vesicles : ALMOST NON-VESICULAR;
Replacement: OXIDE
CLAY
CALCITE
FERROUS OXIDE
Leg : 92 Top/Bottom Interval(mm): 0/1450 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 131.95
Core: 11 Top of Core Depth (m) : 127.50
Sect: 3 Top of Section Depth(m): 130.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1A (2-17), 1B (18-39), 1C (40-60), 2 (64-66),
3 (69-74), 4 (76-80), 5 (82-96), 6 (99-104),
7 (106-109), 8A (112-116), 8B (116-117),
9A (119-128), 9B (120-122), 9C (124-128),
10A (131-136), 10B (132-136), 11A (139-145),
11B (140-145);
Texture : APHYRIC, MEDIUM-GRAINED, MOSTLY PLAG AND CPX IN
OPHITIC RELATIONSHIP, SOME PLAG GLOMEROCRYSTS;
Structure : QUITE STRONGLY VEINED AS INDICATED BY SMALL SIZES OF
PCES 2-11 WHICH ARE BOUNDED BY VEINS, VEIN FILLING
IS GREEN BOTRYOIDAL CLAY AND WHITE CALCITE AND
YELLOW-BROWN CRYSTALS (STAINED ZEOLITE/CLAY ?);
Alteration : MOD
MODERATE ALTERATION EXCEPT PCES 1A(10-17)+1B-C
WHICH ARE WEAKLY ALTERED, DARK GREEN CLAY
ALTERATION OF FINE-GRAINED MATERIAL, SOME YELLOW-
BROWN ALTERATION OF OLIVINE(?);
Comments : NO IGNEOUS CONTACTS, COLOR IS GREY;
Vesicles : Size(mm): Percent: 0
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OLIVINE
SOME PLAG GLOMEROCRYSTS AND POSSIBLE OLIVINE
GRAINS COMPLETELY REPLACED;
Replacement: CLAY
GREEN BOTRYOIDAL CLAY;
CALCITE
ZEOLITE
YELLOW-BROWN CRYSTALS COULD BE STAINED ZEOLITE/
CLAY?;
Leg : 92 Top/Bottom Interval(mm): 0/ 800 Analyst: Pearce, J.A.
Hole: 597C Sample Midpoint (m) : 132.80
Core: 11 Top of Core Depth (m) : 127.50
Sect: 4 Top of Section Depth(m): 132.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (2-6), 2 (8-28), 3A (30-35), 3B (36-45),
4 (47-69), 5 (71-79);
Texture : GENERALLY APHYRIC CONTAINING PLAG AND CPX, FINE TO
MEDIUM-GRAINED;
Structure : VEINS ARE SUB-VERTICAL WITH DARK GREEN CLAY AND
CALCITE ESPECIALLY AT LEFT HAND MARGIN OF PCES 3-4;
Alteration : SLIGHT
WEAK ALTERATION OF FINE-GRAINED MATRIX AND SOME
PYX TO BLUE-GREEN AND GREEN CLAY MINERALS, SOME
ZONES OF OXIDATIVE ALTERATION;
Comments : NO IGNEOUS CONTACTS, COLOR IS GREY WITH BROWNISH
PATCHES;
Vesicles : Size(mm): Percent: 0
Groundmass : PLAGIOCLASE
CLINOPYROXENE
BASALT CONTAINS SOME PLAG AND CPX;
Replacement: CLAY
CALCITE
Leg : 92 Top/Bottom Interval(mm): 0/ 240 Analyst: Erzinger, J.
Hole: 597C Sample Midpoint (m) : 136.74
Core: 12 Top of Core Depth (m) : 136.50
Sect: 1 Top of Section Depth(m): 136.50
LITHOLOGY: APHYRIC BASALT;
SAME AS 11-4;
Piece No. : PCES 1 (2-6), 2 (10-14), 3 (17-23);
Texture : APHYRIC;
Structure : NO VEINS;
Comments : ALTERATION AND ROCK TYPE ARE SAME AS 11-4;
Vesicles : Size(mm): Percent: 0
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