Leg : 64 Top/Bottom Interval(mm): 50/ 100 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 58.13
Core: 8 Top of Core Depth (m) : 58.00
Sect: CC Top of Section Depth(m): 58.08
LITHOLOGY: PLAG PHYRIC BASALT;
DOLERITE;
Piece No. : PCE 1 (6-10);
Texture : SOFT,COARSE-GRAINED;
Alteration : EXTENSIVELY
ALTERATION INDICATES ROCK MAY BE MORE DOLERITIC
THAN BASALTIC;
Comments : DARK GRAY(N3-N4),SEA WATER-PERMEATED,VAGUE GREENISH
TINT;
Phenocrysts: PLAGIOCLASE ( 20%)
Size(mm): 0.5-3
Replacement: CLAY MINERALS
INDICATED BY GREENISH TINT;
Leg : 64 Top/Bottom Interval(mm): 0/ 150 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 60.15
Core: 9 Top of Core Depth (m) : 60.00
Sect: 1 Top of Section Depth(m): 60.00
LITHOLOGY: PLAG PHYRIC DOLERITE;
Piece No. : PCES 1 (2-4), 2 (6-8), 3 (11-14);
Texture : MEDIUM-TO-COARSE-GRAINED,DOLERITIC,PHYRIC,SIMILAR TO
CORE 8-CC;
Alteration : EXTENSIVELY
PERMEATED BY WATER,20% OF ROCK CONSISTS OF GREEN &
VERY SOFT CLAY.MIN(OR ZEOL) LEADING TO LOSS OF
INTEGRITY;
INDIVIDUAL MINERAL GRAINS VERY FRESH,PYX FAIRLY
FRESH;
Comments : FRIABLE,DARK GRAY MATRIX,HOLE TEMPERATURE ESTIMATED
AT 80 DEGREES CELSIUS;
Phenocrysts: PLAGIOCLASE (TO 15%)
Size(mm): 0.5-4
PYROXENE
Groundmass : FELDSPAR
OLIVINE
ID OL UNCERTAIN,MATRIX IS DARK GRAY;
Replacement: CLAY MINERALS ( 20%)
GREEN,VERY SOFT;
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 150/ 600 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 60.60
Core: 9 Top of Core Depth (m) : 60.00
Sect: 1 Top of Section Depth(m): 60.15
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 4 (16-18), 5 (22-28), 6 (29-33), 7 (35-40),
8 (43-47), 9 (48-52), 10 (55-59);
Texture : MEDIUM-GRAINED APHYRIC;
Alteration : EXTENSIVELY
WATER-PERMEATED,SHOT THROUGH WITH VERY SOFT CLAY
(OR ZEOL) RESULTING IN LOSS OF INTEGRITY,
INDIVIDUAL MINERAL GRAINS VERY FRESH,PYX FAIRLY
FRESH AND OL VERY FRESH INDICATE LOW GRADE
ALTERATION;
Comments : DARK GRAY BASALT,FRIABLE,HOLE TEMPERATURE AT DEPTH
ESTIMATED TO BE 80 DEGREES CELSIUS;
Vesicles : Size(mm): TO 1 Percent: 4
Location: Filling: ZEOL
ID VESICLES UNCERTAIN,IRREGULAR CAVITIES,ID ZEOL
UNCERTAIN(NATROLITE?),PCES 9+10;
Groundmass : FELDSPAR
PYROXENE
FAIRLY FRESH;
OLIVINE
VERY FRESH,ID OL UNCERTAIN;
Replacement: CLAY MINERALS
GREEN,VERY SOFT;
ZEOLITE
ID ZEOL UNCERTAIN(POSSIBLY NATROLITE);
Leg : 64 Top/Bottom Interval(mm): 0/ 150 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 67.65
Core: 10 Top of Core Depth (m) : 67.50
Sect: 1 Top of Section Depth(m): 67.50
LITHOLOGY: DOLERITE;
Piece No. : PCES 1 (0-3), 2 (4-7), 3 (9-13);
Texture : MEDIUM-GRAINED,APHYRIC,SIMILAR TO CORE 9-1,PCE 3 MAY
REPRESENT A CHILL ZONE;
Alteration : EXTENSIVELY
CONSTITUENT MINERALS(OL?,PYX,FELD) APPEAR FRESH;
Comments : DARK GREENISH-GRAY BASALT(5G2/1),WATER-PERMEATED,
FRIABLE;
Vesicles :
Location: Filling: ZEOL
PCE 3;
Groundmass : OLIVINE
ID OL UNCERTAIN;
PYROXENE
FELDSPAR
Replacement: ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 150/ 900 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 68.40
Core: 10 Top of Core Depth (m) : 67.50
Sect: 1 Top of Section Depth(m): 67.65
LITHOLOGY: FELDSPAR PHYRIC DOLERITE;
Piece No. : PCES 4 (16-22), 5 (23-27), 6 (30-34), 7 (37-42),
8 (43-53), 9 (55-59), 10 (61-67), 11 (69-72),
12 (74-76), 13 (78-80), 14 (82-85), 15 (86-90);
Texture : PHYRIC,COARSE-GRAINED,GRAINSIZE RANGES 0.5-5MM;
Alteration : EXTENSIVELY
INDICATED BY FRIABLE NATURE & PRESENCE OF CLAY.MIN
ALTHOUGH CONSTITUENT MINERALS NOT VISIBLY ALTERED;
Comments : DARK GREENISH-GRAY(5G2/1),FRIABLE;
Vesicles :
Location: Filling: ZEOL
CAVITIES,ID VESICLES UNCERTAIN;
Phenocrysts: FELDSPAR
Size(mm): TO 10
Groundmass : FELDSPAR
Size(mm): 5
PYROXENE
OLIVINE
Size(mm): 0.5
ID OL UNCERTAIN;
Replacement: CLAY (10-20%)
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1450 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 78.45
Core: 11 Top of Core Depth (m) : 77.00
Sect: 1 Top of Section Depth(m): 77.00
LITHOLOGY: COARSE DOLERITE OR GABBRO;
Piece No. : PCES 1 (0-4), 2 (5-10), 3 (12-17), 4 (18-25),
5 (25-29), 6 (30-35), 7 (36-39), 8 (41-44),
9 (46-50), 10 (52-55), 11 (58-61), 12 (62-66),
13 (67-74), 14 (75-80), 15A (81-86), 15B (87-100),
15C (99-106), 16 (109-119), 17 (120-128),
18A (130-136), 18B (135-142);
Texture : COARSE-GRAINED DOLERITE OR MEDIUM-GRAINED GABBRO,TOP
OF CORE SIMILAR TO CORE 10-1,PCES 4-15C MEDIUM-
GRAINED DOLERITE & PHYRIC,BECOMES COARSER-GRAINED
AFTER PCE 9,PCES 10-18B COARSE GABBRO WITH GRAINSIZE
GENERALLY 1-6MM;
Alteration : EXTENSIVELY
LIGHT GREEN CLAY.MIN(20-30%) IN MINERAL
INTERSTICES, OL & PYX & PLAG ARE FRESH;
Comments : DARK GREENISH-GRAY,WATER-PERMEATED;
Phenocrysts: PLAGIOCLASE ( 15%)
Size(mm): 3-6
OCCASIONALLY IN PCES 10-18B,ALL PLAG FRESH;
OLIVINE
Size(mm): 1-6
PYROXENE
Size(mm): 1-6
PYX & OL FRESH;
Replacement: CLAY (20-30%)
INTERSTICES;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 477 Sample Midpoint (m) : 80.00
Core: 11 Top of Core Depth (m) : 77.00
Sect: 2 Top of Section Depth(m): 78.50
LITHOLOGY: GABBRO;
Piece No. : PCES 1A (0-10), 1B (10-17), 2 (19-27), 3A (29-40),
3B (40-48), 4 (50-57), 5A (60-75), 5B (76-85),
6 (87-93), 7 (95-100), 8 (101-113), 9 (115-121),
10 (122-128), 11 (130-134), 12A (136-138),
12B (138-150);
Texture : COARSE-GRAINED EQUIGRANULAR;
Alteration : EXTENSIVELY
20% OF ROCK CONSISTS OF CLAY.MIN,MAJOR PHENO
MINERALS SEPARATED ALONG GRAIN BOUNDARIES,
ALL PYX & FELD ARE VERY FRESH AND HAVE NOT BEEN
ALTERED;
Vesicles : VUGS FILLED WITH ZEOL & TURQUOISE-BLUE CLAY.MIN,
ACICULAR;
Phenocrysts: PYROXENE
Size(mm): 2-5
EUHEDRAL,FRESH;
PLAGIOCLASE
Size(mm): 2-5
EUHEDRAL,FRESH;
OLIVINE
Size(mm): 1-2
PALE YELLOW,MINOR PHENOS;
MAJOR PHENO MINERALS SEPARATED ALONG GRAIN
BOUNDARIES;
Replacement: CLAY MINERALS
TURQUOISE-BLUE IN VUGS,20% OF ROCK CLAY.MIN;
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1460 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 87.96
Core: 12 Top of Core Depth (m) : 86.50
Sect: 1 Top of Section Depth(m): 86.50
LITHOLOGY: GABBRO;
Piece No. : PCES 1A (1-12), 1B (12-23), 1C (23-29), 2 (30-36),
3 (37-50), 4 (52-63), 5A (65-67), 5B (67-73),
6A (75-79), 6B (78-88), 6C (99-105), 7 (106-114),
8 (115-130), 9 (132-136), 10 (137-146);
Texture : MEDIUM-GRAINED EQUIGRANULAR,SPARSELY PHYRIC WITH
GRAINS BETWEEN 1 & 6MM COMPRISING FRESH XTLS
OF PLAG & PYX & OL,VERY SIMILAR TO CORE 11-2;
Alteration : EXTENSIVELY
20% OF ROCK CLAY.MIN;
Comments : DARK GREEN-GRAY GABBRO,LESS FRIABLE THAN IN PREVIOUS
CORES;
Phenocrysts: PLAGIOCLASE
OCCASIONAL;
Groundmass : PLAGIOCLASE
Size(mm): 1-6
PYROXENE
Size(mm): 1-6
OLIVINE
Size(mm): 1-6
Replacement: CLAY MINERALS ( 20%)
INTERSTITIAL TO GRAINS IN GNDMASS,LIGHT GREEN;
Leg : 64 Top/Bottom Interval(mm): 0/1350 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 89.35
Core: 12 Top of Core Depth (m) : 86.50
Sect: 2 Top of Section Depth(m): 88.00
LITHOLOGY: GABBRO;
COARSE DOLERITE;
Piece No. : PCES 1 (1-20), 2 (22-34), 3A (35-47), 3B (47-58),
3C (58-71), 3D (71-79), 4A (80-90), 4B (90-96),
4C (96-114), 4D (113-135);
Texture : MEDIUM-GRAINED INEQUIGRANULAR TO PHYRIC GABBRO OR
DOLERITE,PCES IN UPPER HALF OF THE CORE TEND TO HAVE
COARSE TEXTURE(SIMILAR TO CORE 12-1) WHICH GRADE
SLIGHTLY TO A MEDIUM-GRAINED DOLERITE TEXTURE IN THE
LOWER HALF OF THE CORE(MAIN TRANSITION OCCURS IN
CORES 12-3 & 12-4);
Structure : PALE GREEN CLAY.MIN FACE THE JOINT SURFACES ON
SEVERAL PCES;
Alteration : EXTENSIVELY
20% PALE GREEN CLAY.MIN & ZEOL,MINERAL GRAINS NOT
ALTERED;
Comments : DARK GREEN-GRAY BASALT;
Groundmass : PLAGIOCLASE ( 10%)
Size(mm): TO 6
PROMINENT XTLS;
Replacement: CLAY MINERALS
( FACE%)
Size(mm): JOINT SUR
Minerals Replaced: FACES ON SEVERAL PCES,PALE
(AY.MI%)
Size(mm): N & ZEOL M
Minerals Replaced: AKE UP 20% OF ROCK;
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 477 Sample Midpoint (m) : 91.00
Core: 12 Top of Core Depth (m) : 86.50
Sect: 3 Top of Section Depth(m): 89.50
LITHOLOGY: GABBRO TRANSITIONAL TO PLAG PHYRIC DOLERITE;
Piece No. : PCES 1 (0-8), 2 (10-15), 3A (17-28), 3B (29-31),
3C (33-45), 3D (45-49), 3E (50-56), 3F (56-62),
3G (63-68), 3H (68-73), 3I (74-78), 3J (79-86),
3K (87-92), 3L (92-108), 3M (99-105), 3N (106-111),
3O (112-116), 3P (117-122), 3Q (123-128),
3R (129-138), 3S (139-149);
Texture : MEDIUM-GRAINED SIMILAR TO CORES 12-1 & 12-2 WITH
SUBTLE TRANSITION DISCERNABLE FROM CORE 12-2 THROUGH
CORE 12-3,FINE-GRAINED AT THE BASE TO THE POINT
WHERE IT GRADES INTO A DOLERITIC TEXTURE;
Alteration : EXTENSIVELY
ALTERATION RESTRICTED TO INTERGRANULAR SURFACES OF
PHENOS;
Phenocrysts: PLAGIOCLASE
PYROXENE
PLAG & PYX ARE OF EQUAL SIZE BUT PLAG IS 1.5X MORE
ABUNDANT THAN PYX;
OLIVINE
ALL PHENOS FRESH;
Replacement: CLAY
BLUISH-GREEN;
ZEOLITE
FIBROUS,ACICULAR;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 92.50
Core: 12 Top of Core Depth (m) : 86.50
Sect: 4 Top of Section Depth(m): 91.00
LITHOLOGY: PLAG PHYRIC DOLERITE;
Piece No. : PCES 1A (0-9), 1B (9-17), 1C (17-25), 1D (25-31),
1E (31-80), 1F (79-119), 1G (120-123), 1H (123-128),
1I (129-136), 1J (136-141), 1K (145-148);
Texture : MEDIUM-TO-FINE-GRAINED DOLERITE,BASE OF CORE TENDS
TO BASALTIC TEXTURE;
Structure : CLAY.MIN COATINGS ON SEVERAL PCES INDICATE SMALL
SCALE VEINING;
Alteration : EXTENSIVELY
ALTHOUGH SEVERELY ALTERED THERE IS LESS CLAY.MIN
PRESENT(NOW 10%) THAN IN CORE 12-3;
Comments : DARK GRAY;
Vesicles : Size(mm): Percent: 0
Phenocrysts: PLAGIOCLASE ( 10%)
Size(mm): 1-5
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OLIVINE
MINERAL GRAINS UNALTERED;
CLAY MINERALS ( 10%)
Replacement: CLAY MINERALS
Leg : 64 Top/Bottom Interval(mm): 0/ 550 Analyst: Saunders, A.
Hole: 477 Sample Midpoint (m) : 93.05
Core: 12 Top of Core Depth (m) : 86.50
Sect: 5 Top of Section Depth(m): 92.50
LITHOLOGY: PLAG PHYRIC DOLERITE OR BASALT;
Piece No. : PCES 1A (0-12), 1B (12-15), 1C (15-18), 1D (18-24),
1E (18-24), 1F (25-29), 1G (30-42), 1H (42-51);
Texture : FINE-GRAINED(<0.5MM GRAINSIZE),PHYRIC;
Structure : VEINING IN PCES 1A-1D;
Alteration : MOD
NO DEVELOPMENT OF CLAY.MIN AS IN CORE 12-4;
Comments : DARK GRAY;
Vesicles :
Location: 0 Filling:
Phenocrysts: PLAGIOCLASE ( 10%)
Size(mm): TO 6
LATHS,IRREGULAR TABLOID;
Leg : 64 Top/Bottom Interval(mm): 0/1400 Analyst: Fornari, D.
Hole: 477 Sample Midpoint (m) : 97.40
Core: 13 Top of Core Depth (m) : 96.00
Sect: 1 Top of Section Depth(m): 96.00
LITHOLOGY: PLAG PHYRIC DOLERITE;
Piece No. : PCES 1 (0-1), 2A (3-10), 2B (10-18), 2C (18-21),
2D (22-30), 2E (29-36), 3A (38-47), 3B (47-55),
3C (55-65), 3D (63-70), 3E (71-73), 4A (76-78),
4B (78-96), 4C (95-106), 4D (105-113), 4E (111-121),
4F (120-130), 4G (130-138);
Texture : PHYRIC;
Structure : NO FRACTURES OR VEINS;
Alteration : FRESH
Comments : MEDIUM-LIGHT GRAY;
Phenocrysts: PLAGIOCLASE
Size(mm): 1-4
Groundmass : PYROXENE
OPAQUE MINERAL
OLIVINE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 477 Sample Midpoint (m) : 99.00
Core: 13 Top of Core Depth (m) : 96.00
Sect: 2 Top of Section Depth(m): 97.50
LITHOLOGY: PLAG PHYRIC DOLERITE;
Piece No. : PCES 1 (2-4), 2 (8-10), 3 (12-20), 4A (23-25),
4B (26-29), 5A (31-40), 5B (40-45), 6A (47-56),
6B (55-65), 6C (65-87), 6D (87-120), 6E (120-127),
7 (129-130), 8 (132-150);
Texture : SIMILAR IN ALL RESPECTS TO CORE 13-1;
Structure : NO FRACTURING OR VEINING;
Alteration : FRESH
Comments : MEDIUM-LIGHT GRAY;
Phenocrysts: PLAGIOCLASE
Groundmass : PLAGIOCLASE
FINE PLAG LATHS;
OLIVINE
OPAQUE MINERAL
PYROXENE
Leg : 64 Top/Bottom Interval(mm): 0/ 90 Analyst: Fornari, D.
Hole: 477 Sample Midpoint (m) : 101.59
Core: 14 Top of Core Depth (m) : 101.50
Sect: CC Top of Section Depth(m): 101.60
LITHOLOGY: PLAG PHYRIC DOLERITE;
Piece No. : PCE 1 (0-9);
Texture : SIMILAR IN ALL RESPECTS TO CORES 13-1 & 13-2;
Comments : THIS PCE WAS FOUND JAMMED IN THE CORE CATCHER &
CONSEQUENTLY THE CONTACT BETWEEN THE DOLERITE SILL
ABOVE & THE CLAYSTONE BELOW(RECOVERED IN CORE 15)
WAS NOT RECOVERED BUT IS INFERRED TO BE LOCATED
WITHIN THE DRILLED INTERVAL 101.5-105.5M SUBBOTTOM;
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