Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 223.50
Core: 26 Top of Core Depth (m) : 222.00
Sect: 1 Top of Section Depth(m): 222.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (1-3), 2 (17-18), 3 (10-18), 3A (20-22),
4 (24-30), 5 (32-39), 6 (40-44), 7 (56-67),
8 (70-76), 9 (79-82), 10 (84-91), 11 (93-100),
12 (102-105), 13 (106-118), 14 (120-129),
15 (130-139), 16 (140-143), 17 (145-148);
Texture : APHYRIC,COARSE-GRAINED(0.2-0.5MM);
Structure : VEINS IN PCES 10+15 CALCITE-FILLED;
Alteration : MOD
SLIGHT WEATHERING AURAE IN PCES 7+9 RESULTING IN
BROWN DISCOLORATION;
Comments : DARK GRAY(N4) BASALT,SLIGHT BROWNISH DISCOLORATION
IN PCES 7+9;
Vesicles : Size(mm): TO 1 Percent:
Location: Filling: CALCITE,UNIDENT
Shape : SPHERICAL
PCES 6-10,FILLED WITH WHITE MINERAL(IN PART
CALCITE);
Replacement: CALCITE
SEVERAL PCES HAVE PYR DUSTING;
Leg : 64 Top/Bottom Interval(mm): 0/ 150 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 223.65
Core: 26 Top of Core Depth (m) : 222.00
Sect: 2 Top of Section Depth(m): 223.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (1-7), 2 (10-15);
Texture : APHYRIC,COARSE-GRAINED,SAME AS CORE 26-1;
Leg : 64 Top/Bottom Interval(mm): 0/1200 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 232.70
Core: 27 Top of Core Depth (m) : 231.50
Sect: 1 Top of Section Depth(m): 231.50
LITHOLOGY: VESICULAR BASALT GRADING TO APHYRIC BASALT;
Piece No. : PCES 1 (0-1), 2A (3-11), 2B (10-16), 3 (18-37),
4A (41-50), 4B (50-57), 5 (60-65), 6 (67-69),
7 (72-83), 8 (86-94), 9 (96-99), 10 (101-108),
11 (110-120);
Texture : PCES 2A-4B APHYRIC BASALT,PCES 5-11 APHANITIC
BASALT;
Structure : SMALL VEINS(<1MM THICK) PERVASIVELY FILLED WITH
CALCITE & PYR & POSSIBLY DOLO;
Alteration : FRESH
Comments : PCE 1 IS SILTSTONE WITH DOLO XTLS & PYR,ALL PCES ARE
MEDIUM-LIGHT GRAY(N6) COLOR;
Vesicles : Size(mm): 2-5 Percent:
Location: Filling: CALCITE,PYR
Size(mm): 2-5 Percent:
Location: Filling: CLAY,DOLO
VESICULAR,MOST LINED WITH CALCITE & PYR & CLAY &
DOLO,ID DOLO UNCERTAIN,PCES 2A-4B;
Size(mm): <1 Percent:
Location: Filling: CALCITE
PCES 5-11,SMALL VESICLES,SOMETIMES FILLED;
Replacement: CALCITE
DOLOMITE
CLAY
Leg : 64 Top/Bottom Interval(mm): 0/ 200 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 253.60
Core: 29 Top of Core Depth (m) : 250.50
Sect: CC Top of Section Depth(m): 253.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES NO PCE NUMBERS ASSIGNED;
Texture : APHYRIC,SIMILAR TO UPPER PART OF CORE 27-1;
Comments : MEDIUM GRAY(N6);
Vesicles : Size(mm): TO 10 Percent:
Location: Filling: CALCITE,PYR,CLAY
HIGHLY VESICULAR,LINED;
Replacement: CALCITE
CLAY
Leg : 64 Top/Bottom Interval(mm): 0/1270 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 338.77
Core: 40 Top of Core Depth (m) : 336.00
Sect: 2 Top of Section Depth(m): 337.50
LITHOLOGY: SEDIMENT;
Leg : 64 Top/Bottom Interval(mm): 270/1370 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 338.87
Core: 40 Top of Core Depth (m) : 336.00
Sect: 2 Top of Section Depth(m): 337.77
LITHOLOGY: SEDIMENT;
BAKED SILTY MUDSTONE OR CLAYSTONE;
Piece No. : PCE A (127-137);
Leg : 64 Top/Bottom Interval(mm): 370/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 339.00
Core: 40 Top of Core Depth (m) : 336.00
Sect: 2 Top of Section Depth(m): 337.87
LITHOLOGY: APHYRIC BASALT FRAGMENTS;
Piece No. : PCES B (137-144), C (142-150);
Texture : PCES OF APHYRIC & APHANITIC BASALT EMBEDDED IN
MEDIUM-GRAY(N5-N6) SILTY MUDSTONE,PCE B IS A BAKED
CONTACT WITH CHILLED BASALT & BAKED SELVAGE(NON-
GLASSY);
Leg : 64 Top/Bottom Interval(mm): 0/ 140 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 339.14
Core: 40 Top of Core Depth (m) : 336.00
Sect: 3 Top of Section Depth(m): 339.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES NO PCE NUMBER ASSIGNED;
Texture : 0-14CM FRAGMENTS(2-4CM) OF APHYRIC APHANITIC BASALT
WITH LITHIFIED SILTY CLAYSTONE IN A CLAYEY MATRIX;
Comments : DARK GRAY;
Vesicles : SPARSELY VESICULAR;
Leg : 64 Top/Bottom Interval(mm): 140/1300 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 340.30
Core: 40 Top of Core Depth (m) : 336.00
Sect: 3 Top of Section Depth(m): 339.14
LITHOLOGY: APHYRIC BASALT OR DOLERITE;
Piece No. : PCES 1A (14-37), 1B (37-68), 2 (70-82), 3A (84-97),
3B (97-128);
Texture : APHYRIC,COARSE-GRAINED(GENERALLY <1MM),DISTINCT
MOTTLED APPEARANCE TO THE BASALT IN THE LOWER PART
OF THE SECTION DUE TO LARGE IRREGULAR PYX XTLS WHICH
CONTAIN PLAG XTLS-POIKILITIC TEXTURE;
Structure : PCE 1B HAS VEIN;
Alteration : MOD
FELDSPAR SHOW SOME GREEN STAINING;
FRESH
CONSTITUENT MINERALS;
Comments : MEDIUM GRAY(N5) WHEN DRY;
Vesicles :
Location: Filling: CLAY
SPARSELY VESICULAR,GREEN CLAY FILLING,VERY LITTLE
(IF ANY) CALCITE SINCE NO STRONG REACTION TO HCL
ON VESICLE FILLING;
Groundmass : PYROXENE
LARGE IRREGULAR XTLS & WITH PLAG FORM POIKILITIC
TEXTURE;
PLAGIOCLASE
OLIVINE
FELDSPAR
Replacement: CLAY
CALCITE
ID CALCITE UNCERTAIN SINCE NO STRONG REACTION TO
HCL IN VEIN OR VESICLE FILLING;
Leg : 64 Top/Bottom Interval(mm): 0/ 400 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 340.90
Core: 40 Top of Core Depth (m) : 336.00
Sect: 4 Top of Section Depth(m): 340.50
LITHOLOGY: APHYRIC BASALT OR DOLERITE;
Piece No. : PCES 1 (0-18), 2 (19-30), 3 (32-40);
Texture : APHYRIC,COARSE-GRAINED BASALT OR DOLERITE,MOTTLING
EFFECT SEEN IN CORE 40-3 CONTINUES IN THIS SECTION;
Structure : GREEN CLAY.MIN IN INTERSTICES;
Alteration : MOD
FRESH
CONSTITUENT MINERALS;
Comments : MEDIUM GRAY(N5);
Vesicles :
Location: Filling: CLAY
WHITE CLAY.MIN FILLING,SPARSELY VESICULAR;
Groundmass : PYROXENE
OLIVINE
PYX & OL FAIRLY FRESH;
FELDSPAR
SHOWS GREEN-TINT ALTERATION;
Replacement: CLAY MINERALS
WHITE IN VESICLES,GREEN IN INTERSTICES;
Leg : 64 Top/Bottom Interval(mm): 0/ 780 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 346.28
Core: 41 Top of Core Depth (m) : 345.50
Sect: 1 Top of Section Depth(m): 345.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (0-8), 2A (10-31), 2B (31-78);
Alteration : MOD
INTENSE IN VICINITY OF CLAY & ZEOLITE-FILLED
VEINS (25-35CM, 62-64CM);
Texture : APHYRIC,GRAIN-SIZE < 0.5MM);
Groundmass : OLIVINE
CLINOPYROXENE
FELDSPAR
GREEN-TINTED;
Replacement: CLAY
ZEOLITE
CALCITE ( 0%)
Leg : 64 Top/Bottom Interval(mm): 800/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 347.00
Core: 41 Top of Core Depth (m) : 345.50
Sect: 1 Top of Section Depth(m): 346.30
LITHOLOGY: DOLERITE;
Piece No. : PCE 3 (80-130), 4 (130-150);
Texture : MEDIUM-GRAINED, APHYRIC, AT TOP OF PCE 3 A
CONCENTRATION OF FELSIC MINERALS WHICH MAY BE DUE
TO A PLAG ACCUMULATION OR PART OF A REACTION
AUREOLE AROUND A VEIN NOT RECOVERED;
Comments : COLOR MEDIUM DARK-GRAY (N4-N5);
Alteration : MOD
ROCK HAS A "PATCHY"APPEARANCE DUE TO ALTERATION;
Groundmass : OLIVINE
Size(mm): 0.5-1.0
PYROXENE
Size(mm): 0.5-1.0
PLAGIOCLASE
Size(mm): 0.5-1.0
Leg : 64 Top/Bottom Interval(mm): 0/1400 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 348.40
Core: 41 Top of Core Depth (m) : 345.50
Sect: 2 Top of Section Depth(m): 347.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-10), 1B (10-30), 1C (22-40), 1D (40-62),
1E (60-84), 1F (82-93), 1G (90-103), 1H (102-110),
1I (110-129), 1J (127-139);
Texture : MEDIUM-GRAINED APHYRIC;
Structure : AT 103CM A 1CM CAVITY LINED WITH DRUSY WHITE XTLS
(QTZ?),1-2MM WIDE VEINS OF ZEOL(?) & CLAY & QTZ;
Alteration : MOD
PCES 1A-1D+1I-1J,VICINITY OF VEINS;
EXTENSIVELY
PCES 1E-1H WITH PATCHES OF QTZ(?);
Comments : MEDIUM GRAY(N5) WHEN DRY;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
OLIVINE
Replacement: CLAY
QUARTZ
ZEOLITE
ID ZEOL UNCERTAIN;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 350.00
Core: 41 Top of Core Depth (m) : 345.50
Sect: 3 Top of Section Depth(m): 348.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-31), 1B (32-70), 1C (69-92), 1D (90-102),
1E (101-114), 1F (114-124), 1G (124-137),
1H (136-147);
Texture : MEDIUM-GRAINED(1-1.5MM),APHYRIC;
Structure : NARROW 1-2MM VEINS OF WHITE ZEOL & SI WITH REACTION
AUREOLES,102-108CM DEVELOPMENT OF ELONGATE(TO 1CM)
PYX XTLS IN A FELSIC GNDMASS(PROBABLY AN ALTERATION
AREA BUT APPEARS PEGMATITIC);
Alteration : MOD
OCCASIONAL BLEBS OF WHITE SILICA(?) OR ZEOL(?);
Comments : MEDIUM-GRAY(N4-N5);
Groundmass : FELDSPAR
PYROXENE
XTLS,POSSIBLY AN ALTERATION AREA BUT APPEARS
PEGMATITIC;
Replacement: ZEOLITE
SILICA
ID SILICA UNCERTAIN;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 351.50
Core: 41 Top of Core Depth (m) : 345.50
Sect: 4 Top of Section Depth(m): 350.00
LITHOLOGY: APHYRIC BASALT OR DOLERITE;
Piece No. : PCES 1A (0-12), 1B (12-35), 1C (35-70), 1D (70-105),
1E (106-123), 1F (123-136), 1G (135-149);
Texture : APHYRIC,MEDIUM-COARSE-GRAINED,APPEARS EQUIGRANULAR;
Structure : CALCITE & CLAY VEINS(TO 0.5CM THICK);
Alteration : MOD
ALTERATION MORE SEVERE NEAR CALCITE & CLAY VEINS
(ZONES UP TO 2CM WIDE);
EXT
32-42CM, 95-104CM, 127-137CM;
Comments : MEDIUM-GRAY(N5);
Groundmass : CLINOPYROXENE
OLIVINE
PLAGIOCLASE
Replacement: CALCITE
CLAY
Leg : 64 Top/Bottom Interval(mm): 0/1300 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 352.80
Core: 41 Top of Core Depth (m) : 345.50
Sect: 5 Top of Section Depth(m): 351.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-12), 1B (11-45), 1C (45-73), 1D (71-88),
1E (88-96), 1F (97-114), 1G (114-130);
Texture : APHYRIC,MEDIUM-GRAINED(1-2MM),OCCASIONAL SILICA(?)
BLEBS;
Alteration : MOD
FAIRLY BADLY ALTERED;
Comments : MEDIUM-GRAY(N4-N5),CONTINUATION OF CORE 41-4;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
OLIVINE
Replacement: SILICA
ID SILICA UNCERTAIN;
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 354.50
Core: 41 Top of Core Depth (m) : 345.50
Sect: 6 Top of Section Depth(m): 353.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-8), 1B (17-23), 1C (24-34), 1D (35-47),
1E (47-63), 1F (62-75), 1G (75-92), 1H (92-103),
1I (103-113), 1J (112-123), 1K (122-134),
1L (139-149);
Texture : MEDIUM-GRAINED(0.5-1.5MM GRAINSIZE),APHYRIC;
Structure : SEGREGATION OF MAFICS FROM FELSICS LEADING TO
BLOTCHY APPEARANCE,LESS VEINING THAN IN PREVIOUS
SECTIONS;
Alteration : MOD
ABUNDANT SECONDARY ALTERATION WITH DEVELOPMENT OF
IRREGULAR BLEBS OF ZEOL & SILICA;
Comments : MEDIUM-GRAY(N4-N5);
Groundmass : PLAGIOCLASE
PYROXENE
OLIVINE
Replacement: ZEOLITE
SILICA
Leg : 64 Top/Bottom Interval(mm): 0/1220 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 355.72
Core: 41 Top of Core Depth (m) : 345.50
Sect: 7 Top of Section Depth(m): 354.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-12), 1B (13-23), 1C (21-38), 1D (38-52),
1E (48-71), 1F (71-85), 1G (85-95), 2 (96-106),
3 (108-122);
Texture : MEDIUM-GRAINED(1-2MM GRAINSIZE),APHYRIC,DISTINCT
SEGREGATION OF MINERAL GRAINS PRODUCES A BLOTCHY
APPEARANCE;
Alteration : MOD
PCES 1A-2,BLEBS OF AMORPHOUS WHITE ZEOL & SILICA
ESPECIALLY IN PCS 1E+1F;
Comments : MEDIUM-GRAY(N4-N5),CONTINUATION OF CORE 41-6,PCE 3
MARKS END OF CORE;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
OLIVINE
Replacement: ZEOLITE
SILICA
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 356.50
Core: 42 Top of Core Depth (m) : 355.00
Sect: 1 Top of Section Depth(m): 355.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-3), 1B (3-16), 1C (16-23), 1D (22-32),
1E (31-40), 1F (41-55), 1G (56-70), 1H (70-85),
1J (84-105), 1L (105-116), 1M (116-127),
1N (126-138), 1O (137-147);
Texture : MEDIUM-GRAINED(0.5-1MM GRAINSIZE),APHYRIC,SIMILAR IN
ALL RESPECTS TO CORE 41-1;
Structure : SILICA-CALCITE-ZEOL VEINS;
Alteration : MOD
EXTENSIVELY
AROUND SEVERAL VEINS(24-28+64-70+92-95CM);
Comments : MEDIUM GRAY(N5);
Vesicles :
Location: Filling: SILICA
SOME FILLED VUGS;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
OPAQUE MINERALS
OLIVINE
Replacement: CALCITE
ZEOLITE
SILICA
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 358.00
Core: 42 Top of Core Depth (m) : 355.00
Sect: 2 Top of Section Depth(m): 356.50
LITHOLOGY: APHYRIC BASALT;
APHYRIC DOLERITE (MAJOR ROCK TYPE);
Piece No. : PCES 1A (1-15), 1B (15-21), 1C (22-35), 1D (35-51),
1E (52-81), 1F (80-104), 1G (103-117), 1H (117-147);
Texture : MEDIUM-GRAINED,APHYRIC,PCE 1G APPEARS TO HAVE SHARDS
OF FRESH GLASS & MAY REPRESENT A CHILL ZONE,SMALL
MINERAL SEGREGATIONS SEPARATED BY BLEBS OF FINER-
GRAINED MATERIAL;
Structure : VEINS FILLED WITH SILICA & ZEOL & SOME CALCITE;
Alteration : MOD
EXTENSIVELY
ALTERATION ZONE PCE 1G,ZONES NEAR VEINS;
Comments : MEDIUM-GRAY(N5-N6);
Groundmass : CLINOPYROXENE
OLIVINE
PLAGIOCLASE
OPAQUE MINERALS
Replacement: ZEOLITE
SILICA
CALCITE
VERY LITTLE;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 359.50
Core: 42 Top of Core Depth (m) : 355.00
Sect: 3 Top of Section Depth(m): 358.00
LITHOLOGY: APHYRIC DOLERITE GRADING TO GABBRO;
Piece No. : PCES 1A (1-12), 1B (10-14), 1C (13-21), 1D (20-31),
1E (30-43), 1F (43-67), 2 (69-73), 3A (76-85),
3B (87-97), 4 (98-103), 5A (106-115), 5B (115-127),
5C (127-134), 5D (135-140), 5E (141-149);
Texture : MEDIUM-GRAINED PCES 1-2,APHYRIC,COARSE-GRAINED PCES
3A-5A APPROACHING GABBROIC TEXTURE WITH LARGE CPX &
PLAG XTLS(1-3MM LONG),CONTACT IN PCE 3B ZONE OF PLAG
& CPX PHYRIC BASALT-DOLERITE ENDS IN BASE OF PCE 5B,
SIMILAR TO PREVIOUS SECTIONS;
Structure : PCES 1-2 QTZ & ZEOL VEINS;
Alteration : MOD
EXTENSIVELY
AROUND VEINS;
Comments : PCES 1-2 MEDIUM-GRAY(N5);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
LARGE CPX & PLAG XTLS PCES 3A-5E;
Replacement: QUARTZ
ZEOLITE
QTZ & ZEOL IN PCES 1-2;
Leg : 64 Top/Bottom Interval(mm): 0/1050 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 360.55
Core: 42 Top of Core Depth (m) : 355.00
Sect: 4 Top of Section Depth(m): 359.50
LITHOLOGY: DOLERITE OR GABBRO;
Piece No. : PCES 1A (0-24), 1B (25-32), 1C (32-40), 2 (42-48),
3 (52-59), 4 (61-69), 5A (72-82), 5B (83-88),
5C (90-93), 5D (94-101), 5E (102-105);
Texture : EQUIGRANULAR COARSE-GRAINED DOLERITE TO GABBRO;
Structure : VEINS SILICEOUS WITH LITTLE OR NO CALCITE;
Alteration : MOD
WEATHERED;
Comments : MEDIUM GRAY(N5),PCE 5E MARKS END OF CORE;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
Replacement: SILICA
CALCITE
LITTLE OR NO CALCITE;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 366.00
Core: 43 Top of Core Depth (m) : 364.50
Sect: 1 Top of Section Depth(m): 364.50
LITHOLOGY: DOLERITE OR GABBRO;
Piece No. : PCES 1A (1-25), 1B (25-35), 1C (25-40), 1D (40-50),
1E (50-55), 1F (55-60), 1G (66-101), 1H (102-148);
Texture : COARSE-GRAINED,DISCRETE APHYRIC ZONES OCCUR AT
70+116+138CM;
Structure : DISCRETE APHYRIC ZONES SOMETIMES ASSOCIATED WITH
SILICEOUS VEINS,ROCK VERY UNFRACTURED;
Alteration : MOD
Comments : MEDIUM-GRAY(N5);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
OLIVINE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 367.50
Core: 43 Top of Core Depth (m) : 364.50
Sect: 2 Top of Section Depth(m): 366.00
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (1-36), 1B (36-69), 1C (70-101),
1D (101-133), 1E (132-148);
Texture : ZONES OF APHANITIC BASALT IN TOP OF PCE 1B & MOSTLY
PCE 1E,CONTINUATION OF INCREASING GRAINSIZE SEEN IN
LAST FEW CORES;
Alteration : MOD
Phenocrysts: OLIVINE
SMALL PHENOS,ID OL UNCERTAIN,PRESENT IN APHANITIC
ZONE;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
OLIVINE
Leg : 64 Top/Bottom Interval(mm): 0/1420 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 368.92
Core: 43 Top of Core Depth (m) : 364.50
Sect: 3 Top of Section Depth(m): 367.50
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (0-15), 1B (15-30), 1C (30-48), 1D (48-60),
1E (60-79), 1F (74-88), 1G (86-100), 1H (101-110),
1I (111-125), 1J (124-142);
Texture : 1-2MM GRAINSIZE,2 APHANITIC ZONES IN PCES 1C &
CONTINUES THROUGH PCES 1F-1G;
Structure : ROCK IS VERY UNFRACTURED,ONE SMALL VEIN CUTS ACROSS
THE TOP OF PCE 1I;
Alteration : MOD
Comments : GNDMASS MEDIUM GRAY(N5),APHANITIC ZONES ARE LIGHT
GRAY(N7);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
OLIVINE
Leg : 64 Top/Bottom Interval(mm): 0/1300 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 370.30
Core: 43 Top of Core Depth (m) : 364.50
Sect: 4 Top of Section Depth(m): 369.00
LITHOLOGY: DOLERITE SILL;
Piece No. : PCES 1A (1-4), 1B (3-9), 1C (8-12), 1D (12-17),
1E (18-21), 1F (22-26), 2A (28-35), 2B (35-52),
2C (52-59), 2D (60-78), 2E (78-83), 2F (84-88),
2G (89-97), 2H (98-116), 2I (116-129);
Texture : SAME AS CORE 43-3 EXCEPT FOR PCE 2D WHICH IS AN
APHANITIC BASALT ZONE;
Structure : PRINCIPALLY FILLED WITH SILICA & CLAY, SILL;
Alteration : MOD
Comments : PCE 2I MARKS END OF CORE;
Replacement: SILICA
CALCITE
CLAY
Leg : 64 Top/Bottom Interval(mm): 00/ 430 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 374.43
Core: 44 Top of Core Depth (m) : 374.00
Sect: 1 Top of Section Depth(m): 374.00
LITHOLOGY: GABBRO;
Piece No. : PCE 1A (0-10), 1B (11-22), 1C (22-27), 1D (27-33),
1E (33-43);
Comments : SIMILAR TO BASE OF CORE 42 (DOES DESCRIBER MEAN
CORE 43? - ENCODER'S QUERY);
Alteration : MOD
Groundmass : CLINOPYROXENE
OLIVINE
PLAGIOCLASE
Leg : 64 Top/Bottom Interval(mm): 430/1450 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 375.45
Core: 44 Top of Core Depth (m) : 374.00
Sect: 1 Top of Section Depth(m): 374.43
LITHOLOGY: MICRODOLERITE TO DOLERITE;
Piece No. : PCE 1F (43-72), 1G (73-97), 1H (97-132),
1I (132-142), 1J (132-145), 1K (142-145);
Texture : FROM PCE 1F BECOMES FINER GRAINED (DOLERITIC)
TOWARD BASE, SMALL APHANITIC ZONE AT 116CM;
Structure : LITTLE VEINING BUT 2 CALCITE VEINS OCCURRING, PCE
1E HAS BEAUTIFUL PYRITE VEINS ON THE SIDE;
Comments : BECOMES LIGHTER IN COLOR (LIGHT TO RED-LIGHT GRAY
(N6-N7);
Alteration : SLIGHTLY
ROCK BECOMES SIGNIFICANTLY FRESHER IN THIS ZONE;
Replacement: PYRITE
CALCITE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 377.00
Core: 44 Top of Core Depth (m) : 374.00
Sect: 2 Top of Section Depth(m): 375.50
LITHOLOGY: DOLERITE;
Piece No. : PCES 1 (1-22), 2 (25-33), 3A (36-88), 3B (88-123),
3C (124-149);
Texture : EQUIGRANULAR;
Structure : UNFRACTURED & NO VEINING;
Alteration : FRESH
Comments : MEDIUM-LIGHT GRAY(N6),CONTINUATION OF CORE 44-1;
Leg : 64 Top/Bottom Interval(mm): 0/1400 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 378.40
Core: 44 Top of Core Depth (m) : 374.00
Sect: 3 Top of Section Depth(m): 377.00
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (0-24), 1B (25-37), 1C (38-56), 1D (54-83),
1E (84-99), 1F (99-121), 1G (120-140);
Comments : SAME AS IN CORE 44-2;
Leg : 64 Top/Bottom Interval(mm): 0/1400 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 379.90
Core: 44 Top of Core Depth (m) : 374.00
Sect: 4 Top of Section Depth(m): 378.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-14), 1B (15-37), 1C (37-64), 1D (63-90),
1E (89-120), 1F (120-140);
Texture : APHYRIC DOLERITE,COARSE-GRAINED EQUIGRANULAR;
Structure : MAFICS TEND TO BE CONCENTRATED IN NARROW ZONES
(2-3MM) SURROUNDING MORE FELSIC ZONES(TO 1MM ACROSS)
GIVING A RATHER POLYGONAL APPEARANCE TO THE CUT
SURFACES;
Alteration : MOD
REACTION RIMS AROUND RIMS NOTABLY MAFIC-FREE
TINTED ALTERED FELD,OCCASIONAL BLEBS OF WHITE SI;
Comments : MEDIUM-GRAY(N5) TO LIGHT-BROWNISH-GRAY 5YR6/1;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 2
LATHS;
Groundmass : PYROXENE
OLIVINE
FELDSPAR
TINTED;
Replacement: SILICA
WHITE;
Leg : 64 Top/Bottom Interval(mm): 0/1300 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 381.30
Core: 44 Top of Core Depth (m) : 374.00
Sect: 5 Top of Section Depth(m): 380.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-21), 1B (20-39), 1C (38-68), 1D (68-92),
1E (92-113), 1F (112-130);
Texture : APHYRIC DOLERITE,APPROX EQUIGRANULAR;
Structure : REACTION RIMS AROUND VEINS,MAFICS TEND TO BE
CONCENTRATED IN NARROW ZONES AROUND MORE FELSIC
AREAS APPROX 1.5CM DIAMETER;
Alteration : MOD
REACTION RIMS AROUND VEINS,OCCASIONAL BLEBS OF
WHITE SILICA/ZEOL;
Comments : MEDIUM GRAY TO LIGHT-BROWNISH-GRAY(N5-5YR6/1);
Phenocrysts: PLAGIOCLASE
Size(mm): TO 2
APPROX EQUIGRANULAR LATHS;
Groundmass : PYROXENE
OLIVINE
Replacement: SILICA
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1100 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 382.60
Core: 44 Top of Core Depth (m) : 374.00
Sect: 6 Top of Section Depth(m): 381.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-30), 1B (30-60), 1C (60-91), 1D (93-110);
Texture : APHYRIC DOLERITE,APPROX EQUIGRANULAR;
Structure : MAFICS CONCENTRATED IN NARROW ZONES AROUND MORE
FELSIC AREAS APPROX 1.5CM DIAMETER;
Alteration : MOD
ALTERED FELDSPAR,OCCASIONAL BLEBS OF WHITE SI/ZEOL
Comments : MEDIUM-GRAY TO LIGHT-BROWNISH-GRAY(N5 TO 5YR6/1);
Phenocrysts: PLAGIOCLASE
LATHS;
Groundmass : PYROXENE
OLIVINE
ID OL UNCERTAIN;
FELDSPAR
Replacement: SILICA
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 384.50
Core: 45 Top of Core Depth (m) : 383.00
Sect: 1 Top of Section Depth(m): 383.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCE 1 (1-149);
Comments : FORMS PART OF 186.5CM LENGTH OF DOLERITE RETURNED TO
SCRIPPS UNBROKEN,SECTION NOT SLICED,DRILLED SURFACES
SHOW IDENTICAL CHARACTERISTICS TO CORES 44-6 & 45-2;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 386.00
Core: 45 Top of Core Depth (m) : 383.00
Sect: 2 Top of Section Depth(m): 384.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1 (1-24), 2A (26-36), 2B (36-70), 2C (68-105),
2D (105-130), 2E (130-148);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,MOTTLED OR BLOTCHY
APPEARANCE DUE TO SEGREGATION OF MAFICS FROM FINER-
GRAINED FELSIC PATCHES;
Alteration : MOD
PCES 2A+2D-2E;
Comments : MEDIUM-GRAY(N5) TO LIGHT BROWNISH-GRAY(5YR6/1),PCE 1
SENT TO SCRIPPS,UNSLICED AS PART OF 188.8 CM LENGTH;
Groundmass : CLINOPYROXENE ( 15%)
PARTIALLY ALTERED TO A GREEN COLOR;
PLAGIOCLASE ( 70%)
OLIVINE ( 5%)
Replacement: SILICA
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1450 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 387.45
Core: 45 Top of Core Depth (m) : 383.00
Sect: 3 Top of Section Depth(m): 386.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-32), 1B (30-60), 1C (60-102),
1D (100-142);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,MOTTLED OR BLOTCHY
APPEARANCE DUE TO SEGREGATION OF MAFICS FROM FINER-
GRAINED FELSIC PATCHES(SIMILAR TO CORES 45-1 &
45-2);
Structure : FELDSPAR IN LOWER PART OF CORE ARE AMORPHOUS WHITE
RATHER THAN TRANSLUCENT;
Alteration : MOD
FELD PROBABLY ALTERED & CPX APPEARS TO BE ALTERED;
Comments : MEDIUM GRAY(N5) TO LIGHT BROWNISH-GRAY(5YR6/1);
Groundmass : CLINOPYROXENE ( 15%)
Size(mm): TO 2
PLAGIOCLASE ( 70%)
Size(mm): TO 2
OLIVINE ( 5%)
Size(mm): <1
FELDSPAR
Leg : 64 Top/Bottom Interval(mm): 0/1450 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 388.95
Core: 45 Top of Core Depth (m) : 383.00
Sect: 4 Top of Section Depth(m): 387.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-4), 1B (3-15), 1C (16-40), 1D (40-80),
1E (80-111), 1F (111-130), 1G (130-144);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,MOTTLED OR BLOTCHY
APPEARANCE DUE TO SEGREGATION OF MAFICS FROM FINER-
GRAINED FELSIC PATCHES(SIMILAR TO CORES 45-1 &
45-2);
Structure : PCES 1A+1B SEVERE ZEOLITIZATION AROUND VEINS,VEIN
PCE 1A;
Alteration : MOD
Comments : MEDIUM GRAY(N5) TO LIGHT BROWNISH-GRAY(5YR6/1);
Groundmass : CLINOPYROXENE ( 15%)
Size(mm): TO 2
PLAGIOCLASE ( 70%)
Size(mm): TO 2
OLIVINE ( 5%)
Size(mm): <1
Replacement: ZEOLITE
AROUND VEIN IN PCES 1A+1B;
Leg : 64 Top/Bottom Interval(mm): 0/1460 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 390.46
Core: 45 Top of Core Depth (m) : 383.00
Sect: 5 Top of Section Depth(m): 389.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-20), 1B (20-23), 1C (23-30), 1D (31-71),
1E (72-96), 1F (96-111), 1G (111-146);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,MOTTLED OR BLOTCHY
APPEARANCE,POIKILITIC TEXTURE;
Structure : BLOTCHY APPEARANCE DUE TO SEGREGATION & IRREGULAR
DISTRIBUTION OF MAFIC & FELSIC COMPONENTS;
Alteration : MOD
EXTENSIVELY
15-30CM INTERVAL;
Comments : MEDIUM GRAY(N5) TO LIGHT BROWNISH-GRAY(5YR6/1);
Groundmass : CLINOPYROXENE
FELDSPAR
CLAY
OLIVINE
Replacement: CLAY
Leg : 64 Top/Bottom Interval(mm): 0/ 900 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 391.40
Core: 45 Top of Core Depth (m) : 383.00
Sect: 6 Top of Section Depth(m): 390.50
LITHOLOGY: APHYRIC DOLERITE;
APHYRIC GABBRO;
Piece No. : PCES 1A (1-8), 1B (9-50), 1C (50-80), 1D (81-87);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,POIKILITIC/BLOTCHY
APPEARANCE & TEXTURE & COMPOSITION SIMILAR TO CORE
45-5,PCE 1D IS APHYRIC GABBRO;
Alteration : MOD
EXT
77-87CM;
Comments : MEDIUM GRAY(N5) TO LIGHT BROWNISH-GRAY(5YR6/1);
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 393.50
Core: 46 Top of Core Depth (m) : 392.00
Sect: 1 Top of Section Depth(m): 392.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-4), 1B (5-9), 1C (10-13), 1D (12-20),
1E (21-50), 1F (52-78), 1G (79-103), 1H (103-147);
Texture : PCES 1A-1D COARSE-GRAINED APHYRIC GABBRO,PCS 1E-1H
MEDIUM-GRAINED APHYRIC DOLERITE WITH POIKILITIC
SEGREGATION OF MAFICS FROM FELSICS YIELDING A PATCHY
APPEARANCE;
Alteration : EXTENSIVELY
PCES 1A-1D;
MOD
REMAINDER OF SECTION;
Comments : PCES 1A-1D DARK BROWNISH-GRAY(5YR6/1),PCES 1E-1H
(N5 TO 5YR6/1);
Phenocrysts: COMBINATION
PYX-FELD INTERGROWTHS,PINKISH AGGS,APPEAR TO HAVE
XTLLINE STRUCTURE;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OLIVINE
PLAG & CPX & OL IN PCES 1A-1D;
ZEOLITE
Replacement: SILICA
PCES 1E-1H,AMORPHOUS;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 395.00
Core: 46 Top of Core Depth (m) : 392.00
Sect: 2 Top of Section Depth(m): 393.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-25), 1B (25-53), 1C (53-73), 1D (73-99),
1E (98-125), 1F (124-150);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,PATCHY APPEARANCE
(POIKILITIC);
Structure : SEGREGATION OF MAFICS CAUSES BLOTCHY APPEARANCE,ZEOL
-FILLED CAVITIES(?);
Alteration : MOD
Comments : MEDIUM GRAY TO MEDIUM BROWNISH-GRAY(5YR6/1);
Groundmass : PYROXENE
PLAGIOCLASE
OLIVINE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 396.50
Core: 46 Top of Core Depth (m) : 392.00
Sect: 3 Top of Section Depth(m): 395.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-35), 1B (34-57), 1C (56-77), 1D (76-95),
1E (95-101), 1F (101-110), 1G (109-132),
1H (130-149);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,COARSE-GRAINED
ALMOST GABBROIC INTERVAL AT 93-101CM,BLOTCHY
APPEARANCE SIMILAR TO PREVIOUS SECTIONS,POIKILITIC
TEXTURE MAY BE DUE TO GROWTH OF 1-1.5CM INTERGROWN
XTLS OF FELDSPAR & OPX(?);
Structure : VEINING NOTICEABLY LESS THAN IN PREVIOUS CORES,ZEOL
& SI-FILLED CAVITIES IN PCES 1A+1D-1E,NUMEROUS EMPTY
CAVITIES IN GABBROIC SECTION PERHAPS DUE TO
HYDROTHERMAL DISSOLUTION;
Alteration : MOD
APPEARS TO BE DECREASING;
EXTENSIVELY
INTERVAL 88-105CM;
Comments : MEDIUM GRAY(N5) TO MEDIUM LIGHT BROWNISH-GRAY
(5YR6/1);
Groundmass : PYROXENE
FELDSPAR
ORTHOPYROXENE
ID OPX UNCERTAIN;
PLAGIOCLASE
OLIVINE
Replacement: ZEOLITE
SILICA
Leg : 64 Top/Bottom Interval(mm): 0/1350 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 397.85
Core: 46 Top of Core Depth (m) : 392.00
Sect: 4 Top of Section Depth(m): 396.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-25), 1B (25-42), 1C (42-75), 1D (75-94),
1E (95-110), 1F (111-116), 1G (115-132);
Texture : MEDIUM-GRAINED(GRAINSIZE 1-1.5MM),APHYRIC DOLERITE;
Alteration : MOD
OCCASIONAL SMALL(1MM) AMORPHOUS WHITE BLEBS OF SI
& ZEOL;
Comments : MEDIUM GRAY(N5);
Groundmass : FELDSPAR
SLIGHTLY ALTERED;
CLINOPYROXENE
OLIVINE
FRESHER THAN FELDSPAR;
Replacement: SILICA
ZEOLITE
SILICA & ZEOL IN AMORPHOUS BLEBS;
Leg : 64 Top/Bottom Interval(mm): 0/1150 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 399.15
Core: 46 Top of Core Depth (m) : 392.00
Sect: 5 Top of Section Depth(m): 398.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-20), 1B (20-45), 1C (45-60), 1D (60-85),
1E (85-112);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,GRAINSIZE 1-1.5MM,
LARGER POIKILOBLASTS OF PYX ENCLOSING FELD PRODUCE
BLOTCHY APPEARANCE;
Structure : FINE WHITE VEINS OF SILICA & ZEOL;
Alteration : MOD
OCCASIONAL SMALL AMORPHOUS WHITE BLEBS OF SILICA &
ZEOL;
MOD
FELDSPAR;
Groundmass : FELDSPAR
CLINOPYROXENE
OLIVINE
Replacement: SILICA
Leg : 64 Top/Bottom Interval(mm): 0/1400 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 411.40
Core: 48 Top of Core Depth (m) : 410.00
Sect: 1 Top of Section Depth(m): 410.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-6), 1B (7-18), 1C (17-28), 2A (30-32),
2B (32-36), 2C (38-40), 2D (41-45), 2E (45-48),
3A (50-67), 3B (67-80), 3C (85-115), 3D (115-137);
Texture : MEDIUM-GRAINED,APHYRIC,GRAINSIZE 1-1.5,SIMILAR TO
CORE 46;
Alteration : MOD
Comments : MEDIUM-GRAY(N5);
Groundmass : FELDSPAR
SLIGHTLY ALTERED;
CLINOPYROXENE
OLIVINE
CPX & OL FRESHER THAN FELDSPAR;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 413.50
Core: 49 Top of Core Depth (m) : 412.00
Sect: 1 Top of Section Depth(m): 412.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-25), 1B (25-50), 1C (51-65), 1D (65-80),
1E (81-104), 1F (101-110), 1G (110-125),
1H (125-138), 1I (139-150);
Texture : MEDIUM-GRAINED,APHYRIC,BLOTCHY APPEARANCE DUE TO
OPHITIC TEXTURES;
Structure : VEIN SEPARATING PCES 1D+1E HAS CAUSED CONSIDERABLE
REXTLLLIZATION OF THESE PCES FOR A DISTANCE OF 2CM
EITHER SIDE OF VEIN;
Alteration : MOD
ALTERATION APPEARS TO BE LESS THAN IN PREVIOUS
CORES,MINOR AMORPHOUS BLEBS OF SILICA & ZEOL;
Comments : MEDIUM-GRAINED(N4/N5);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
PALE-GREEN PYX XTLS OPHITICALLY ENCLOSE SMALL PLAG
LATHS,LARGER PYX XTLS SURROUNDED BY DARK GREEN PYX
& PLAG & ORE;
OPAQUE MINERALS
Replacement: SILICA
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1450 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 414.95
Core: 49 Top of Core Depth (m) : 412.00
Sect: 2 Top of Section Depth(m): 413.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-12), 1B (12-22), 1C (23-32), 1D (32-47),
1E (47-61), 1F (60-83), 1G (83-105), 1H (105-130),
1I (130-145);
Texture : IDENTICAL TO CORE 49-1;
Structure : PCES 1E-1F+1H SILICA &/OR ZEOL-FILLED VEINS WITH NO
CALCITE;
Alteration : MOD
Comments : CONTINUATION OF CORE 49-1;
Replacement: SILICA
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1450 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 416.45
Core: 49 Top of Core Depth (m) : 412.00
Sect: 3 Top of Section Depth(m): 415.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-5), 1B (5-41), 1C (40-75), 1D (74-94),
1E (93-130), 1F (130-142);
Texture : IDENTICAL TO CORES 49-1 & 49-2;
Structure : ZEOL &/OR SI-VEINS IN PCES 1C+1F(NO CARB DETECTED);
Alteration : MOD
PERHAPS FRESHER THAN CORES 49-1 & 49-2;
Comments : CONTINUATION OF CORE 49-2;
Replacement: SILICA
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 420.50
Core: 50 Top of Core Depth (m) : 419.00
Sect: 1 Top of Section Depth(m): 419.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-39), 1B (38-79), 1C (79-128),
1D (128-149);
Texture : MEDIUM-GRAINED APHYRIC DOLERITE,INEQUIGRANULAR,
POIKILITIC TEXTURE;
Structure : PCE 1A EXTENSIVELY VEINED & FILLED WITH SI &/OR ZEOL
(NO CARB);
Alteration : FRESHER THAN PREVIOUS CORES;
Comments : MEDIUM GRAY(N5) TO MEDIUM-DARK GRAY(N4);
Groundmass : PYROXENE
Size(mm): 1-1.5
PINKISH-GRAY & ROUNDED & ANHEDRAL DIFFUSE XTLS;
FELDSPAR
PLAGIOCLASE
PYX(SUBOPHITICALLY ENCLOSING PLAG) IN A MATRIX OF
FELDSPAR & DARK PYX & ORE & OL;
Replacement: SILICA
ZEOLITE
CARBONATE ( 0%)
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 422.00
Core: 50 Top of Core Depth (m) : 419.00
Sect: 2 Top of Section Depth(m): 420.50
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (1-40), 1B (40-88), 1C (87-130),
1D (130-148);
Texture : IDENTICAL TO CORE 50-1;
Structure : VERY DIFFUSE WHITE VEIN IN PCE 1B(58-63CM);
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 423.50
Core: 50 Top of Core Depth (m) : 419.00
Sect: 3 Top of Section Depth(m): 422.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-7), 1B (7-27), 1C (27-40), 1D (40-55),
1E (55-73), 1F (73-95), 1G (94-130), 1H (130-145);
Texture : INEQUIGRANULAR DOLERITE,APHYRIC,ESSENTIALLY
IDENTICAL TO PREVIOUS 2 SECTIONS;
Structure : PCES 1B+1F-1G MINOR VEINING(NOT CALCITE);
Alteration : FRESH
Comments : MEDIUM-GRAY TO MEDIUM DARK GRAY(N5-N4);
Groundmass : PYROXENE
LARGE BROWNISH-GRAY IRREGULAR PYX,DARK
GREEN PYX;
PLAGIOCLASE
OLIVINE
ID UNCERTAIN FOR OL;
OPAQUE MINERALS
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 425.00
Core: 50 Top of Core Depth (m) : 419.00
Sect: 4 Top of Section Depth(m): 423.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-10), 1B (11-56), 1C (55-87), 1D (87-119),
1E (118-148);
Texture : SAME AS PREVIOUS SECTION,ACCENTUATION OF DARK
MINERALS CAUSING A SPECKLED APPEARANCE ADJACENT TO
THE VEINS;
Structure : 2 VEINS RUNNING ALMOST THE LENGTH OF THE SECTION ARE
3-5MM WIDE & CONTAIN APHANITIC PALE GRAY MINERALS
(NOT CALCITE);
Alteration : MOD
REACTION OF VEIN WITH COUNTRY ROCK CONSIDERABLE;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 426.50
Core: 50 Top of Core Depth (m) : 419.00
Sect: 5 Top of Section Depth(m): 425.00
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (1-14), 1B (16-30), 1C (28-49), 1D (48-76),
1E (75-101), 1F (99-118), 1G (118-143);
Texture : ESSENTIALLY IDENTICAL TO CORE 50-3;
Structure : TWO MINOR VEINS IN PCES 1C+1G(NOT CALCITE-PROBABLY
SILICA &/OR ZEOL);
Replacement: SILICA
ZEOLITE
ID SILICA & ZEOL UNCERTAIN;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 428.00
Core: 50 Top of Core Depth (m) : 419.00
Sect: 6 Top of Section Depth(m): 426.50
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (0-16), 1B (15-31), 1C (31-49), 1D (48-76),
1E (76-110), 1F (110-137), 1G (136-147);
Texture : ESSENTIALLY IDENTICAL TO CORE 50-3;
Structure : MINOR VEINS IN PCES 1A+1C+1G(NOT CALCITE-PROBABLY
SILICA &/OR ZEOL);
Replacement: SILICA
ZEOLITE
ID SILICA & ZEOL UNCERTAIN;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 429.50
Core: 51 Top of Core Depth (m) : 428.00
Sect: 1 Top of Section Depth(m): 428.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-3), 1B (3-8), 1C (8-10), 2A (11-53),
2B (53-78), 2C (79-90), 2D (90-111), 2E (110-128),
2F (128-146);
Texture : APHYRIC,MEDIUM-GRAINED BUT STRONGLY INEQUIGRANULAR
DOLERITE,POIKILITIC TEXTURE,PCES 1A-1C PCES OF PYX
GABBRO;
Alteration : MOD
PCES 1A-1C+2F,WEATHERING VERY SLIGHT;
FRESH
PCES 2A-2E;
Comments : MEDIUM-GRAY(N5);
Groundmass : PYROXENE
LARGE,ROUNDED,ANHEDRAL,GRAY-BROWN XTLS;
PLAGIOCLASE
CLINOPYROXENE
OLIVINE
OPAQUE MINERALS
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 431.00
Core: 51 Top of Core Depth (m) : 428.00
Sect: 2 Top of Section Depth(m): 429.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-20), 1B (19-40), 1C (39-49), 1D (49-59),
1E (58-79), 1F (78-96), 1G (95-111), 1H (111-130),
1I (130-149);
Texture : APHYRIC MEDIUM-GRAINED POIKILITIC DOLERITE,SIMILAR
TO CORE 51-1;
Structure : ABUNDANT PLAG-CPX GABBRO XENOLITHS(TO 10CM ACROSS);
Comments : MEDIUM GRAY(N5);
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 432.50
Core: 51 Top of Core Depth (m) : 428.00
Sect: 3 Top of Section Depth(m): 431.00
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (0-12), 1B (13-33), 1C (33-46), 1D (47-53),
1E (53-62), 1F (62-72), 1G (73-91), 1H (92-110),
1I (110-125), 1J (125-131), 1K (130-147);
Texture : 20% OF ROCK COARSE-GRAINED XENOLITHS OF PYX-FELDSPAR
GABBRO,SIMILAR TO CORE 51-1,POIKILITIC DOLERITE;
Structure : CAVITIES IN XENOLITHS CONTAIN ACICULAR ZEOL IN
ADDITION TO CRYPTOXTLLINE SILICA;
Alteration : FRESH
IN GENERAL,BOTH GABBRO & DOLERITE;
Replacement: ZEOLITE
SILICA
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 434.00
Core: 51 Top of Core Depth (m) : 428.00
Sect: 4 Top of Section Depth(m): 432.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-19), 1B (18-35), 1C (35-48), 1D (45-58),
1E (58-74), 1F (75-93), 1G (94-102), 1H (101-120),
1I (121-127), 1J (125-137), 1K (136-147);
Texture : MEDIUM-GRAINED,INEQUIGRANULAR,APHYRIC,POIKILITIC,
SIMILAR TO CORE 51-1;
Structure : 5% 5-10CM WIDE XENOLITHS OF PYX-FELDSPAR GABBRO,
XENOLITHS HAVE ZEOL-LINED OR FILLED CAVITIES;
Alteration : MOD
PCES 1I-1J;
FRESH
REMAINDER OF SECTION;
Comments : MEDIUM GRAY(N4-N5);
Groundmass : PYROXENE
FELDSPAR
PYX & FELDSPAR IN GABBRO XENOLITHS;
Replacement: ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 435.50
Core: 51 Top of Core Depth (m) : 428.00
Sect: 5 Top of Section Depth(m): 434.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-10), 1B (10-30), 1C (30-45), 1D (45-55),
1E (55-84), 1F (85-109), 1G (109-124), 1H (125-134),
1I (135-148);
Texture : ESSENTIALLY SIMILAR TO CORE 51-4;
Structure : FEWER GABBRO XENOLITHS THAN CORE 51-4,AMORPHOUS SI
&/OR ZEOL-FILLED CAVITIES(TO 2MM ACROSS) IN PCE 1G
(117-120CM);
Replacement: SILICA
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1350 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 436.85
Core: 51 Top of Core Depth (m) : 428.00
Sect: 6 Top of Section Depth(m): 435.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (0-11), 1B (10-28), 1C (28-43), 1D (43-62),
1E (62-79), 1F (79-89), 1G (89-111), 1H (111-120),
1I (121-135);
Texture : MEDIUM-GRAINED,APHYRIC,INEQUIGRANULAR POIKILITIC,
TEXTURE & MINERALOGY VERY SIMILAR TO THOSE IN
PRECEDING CORES & SECTIONS,POIKILOBLASTIC XTLS OF
PINKISH-GRAY PYX SUBOPHITICALLY ENCLOSING PLAG;
Alteration : FRESH
MOD
87-91CM INTERVAL DEVELOPMENT OF OCCASIONAL BLEBS
OF AMORPHOUS SILICA &/OR ZEOL;
Comments : MEDIUM GRAY(N5) TO MEDIUM-DARK GRAY(N4);
Groundmass : PYROXENE
PINKISH-GRAY XTLS SUBOPHITICALLY ENCLOSING PLAG;
PLAGIOCLASE
FELDSPAR
PYROXENE
DARK-GREEN;
OLIVINE
OPAQUE MINERALS
FELDSPAR,DARK-GREEN PYX & OL SURROUND PINKISH-GRAY
POIKILOBLASTS;
Replacement: SILICA
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1400 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 438.40
Core: 52 Top of Core Depth (m) : 437.00
Sect: 1 Top of Section Depth(m): 437.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-13), 1B (12-25), 1C (25-34), 1D (34-60),
1E (60-80), 1F (80-104), 1G (103-130), 1H (131-140);
Texture : MEDIUM-GRAINED,APHYRIC,INEQUIGRANULAR-POIKILITIC,
SIMILAR TO CORE 51-1 WITH NO GABBRO XENOLITHS;
Structure : EXTENSIVE AMORPHOUS SI & ZEOL VEINS IN SEVERAL PCES;
Alteration : MOD
MORE ALTERED THAN IN CORE 51-1;
Comments : MEDIUM-DARK GRAY TO DARK GRAY(N4-N3);
Groundmass : PYROXENE
LARGE,PINKISH-GRAY XTLS OPHITICALLY ENCLOSE PLAG;
PLAGIOCLASE
PYROXENE
GREEN;
OLIVINE
OPAQUE MINERALS
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 440.00
Core: 52 Top of Core Depth (m) : 437.00
Sect: 2 Top of Section Depth(m): 438.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-10), 1B (10-17), 1C (17-30), 1D (29-50),
1E (50-63), 1F (62-81), 1G (82-89), 1H (89-98),
1I (98-109), 1J (109-117), 1K (117-125),
1L (125-131), 1M (132-138), 1N (140-148);
Texture : MEDIUM-GRAINED,APHYRIC,POIKILITIC(?),SIMILAR TO CORE
52-1;
Structure : ONE LARGE QTZ & ZEOL VEIN CUTS THROUGH PCES 1F+1G+
1H;
Alteration : MOD
Comments : MEDIUM-DARK GRAY(N4-N5);
Groundmass : CLINOPYROXENE
APPEARS TO BE POIKILITICALLY ENCLOSED AFTER
MINERAL PHASES EXCEPT FOR MORE ABUNDANT OL,LARGE
ANHEDRAL XTLS;
OLIVINE
Replacement: QUARTZ
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1410 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 441.41
Core: 52 Top of Core Depth (m) : 437.00
Sect: 3 Top of Section Depth(m): 440.00
LITHOLOGY: CPX POIKILITIC DOLERITE;
Piece No. : PCES 1A (1-6), 1B (7-15), 1C (15-27), 1D (27-40),
1E (40-56), 1F (57-70), 1G (70-80), 1H (80-94),
1I (94-107), 1J (107-117), 1K (117-128),
1L (128-141);
Texture : HOMOGENOUS,POIKILITIC,SIMILAR TO CORES 52-1 & 52-2;
Structure : LITTLE VEINING,SMALL SILIC VEIN IN PCE 1I,
UNFRACTURED;
Alteration : MOD
Comments : MEDIUM-DARK GRAY;
Phenocrysts: CLINOPYROXENE
Replacement: SILICA
Leg : 64 Top/Bottom Interval(mm): 0/1410 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 442.91
Core: 52 Top of Core Depth (m) : 437.00
Sect: 4 Top of Section Depth(m): 441.50
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (1-16), 1B (17-28), 1C (29-41), 1D (42-56),
1E (57-63), 1F (64-86), 1G (86-100), 1H (100-119),
1I (119-134), 1J (134-145);
Texture : HOMOGENOUS,SIMILAR IN ALL RESPECTS TO CORES 52-1 TO
52-3,POIKILITIC MOTTLING LESS PRONOUNCED;
Structure : NO VEINING & LESS FRACTURED;
Alteration : MOD
FRESHER THAN PREVIOUS SECTIONS;
Comments : MEDIUM-DARK GRAY(N4-N5);
Leg : 64 Top/Bottom Interval(mm): 0/1450 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 444.45
Core: 52 Top of Core Depth (m) : 437.00
Sect: 5 Top of Section Depth(m): 443.00
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (1-10), 1B (11-17), 2 (19-27), 3A (30-38),
3B (37-56), 3C (56-65), 3D (60-70), 3E (70-80),
3F (80-90), 3G (90-96), 3H (96-101), 3I (102-105),
3J (105-120), 3K (121-145);
Texture : MORE HOMOGENOUS & LESS MOTTLED & FINER-GRAINED THAN
PREVIOUS CORES;
Alteration : MOD
PCES 1A-2 MORE ALTERED THAN REST OF SECTION(AT
BASE OF PCE 1B ESPECIALLY);
Comments : MEDIUM GRAY TO MEDIUM-LIGHT GRAY(N5-N6);
Groundmass : CLINOPYROXENE
PLAGIOCLASE
OLIVINE
Leg : 64 Top/Bottom Interval(mm): 0/1410 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 445.91
Core: 52 Top of Core Depth (m) : 437.00
Sect: 6 Top of Section Depth(m): 444.50
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (1-25), 1B (25-38), 1C (39-69), 1D (70-85),
1E (86-121), 1F (122-133), 1G (133-141);
Texture : HOMOGENOUS,SIMILAR TO CORE 52-5,MOTTLING NOT AS
PREVALENT AS IN SECTIONS 1 THRU 4,PCE 1E APPPEARS TO
HAVE AN OL SEGREGATION IN IT;
Structure : UNFRACTURED & UNVEINED;
Alteration : SLIGHTLY TO MOD
Comments : MEDIUM GRAY(N5);
Groundmass : OLIVINE
SEGREGATION IN PCE 1E;
Leg : 64 Top/Bottom Interval(mm): 0/ 500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 446.50
Core: 52 Top of Core Depth (m) : 437.00
Sect: 7 Top of Section Depth(m): 446.00
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (0-23), 1B (24-50);
Texture : SAME AS CORE 52-6,MOTTLING BECOMING PROGRESSIVELY
LESS PROMINENT,HOMOGENOUS;
Structure : UNFRACTURED & UNVEINED;
Alteration : SLIGHTLY
Comments : MEDIUM-GRAY(N6),PCE 1B MARKS END OF CORE 52;
Leg : 64 Top/Bottom Interval(mm): 0/1400 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 447.40
Core: 53 Top of Core Depth (m) : 446.00
Sect: 1 Top of Section Depth(m): 446.00
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-15), 1B (16-41), 1C (40-65), 1D (65-70),
1E (70-86), 1F (86-105), 1G (105-130), 1H (130-140);
Texture : HOMOGENOUS,FINE-GRAINED,APHYRIC,VERY LITTLE
MOTTLING;
Structure : UNFRACTURED,ONE SMALL SI & CLAY VEIN PRESENT IN PCE
1H;
Alteration : SLIGHTLY
MOD
130-140CM;
Replacement: SILICA
CLAY
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 449.00
Core: 53 Top of Core Depth (m) : 446.00
Sect: 2 Top of Section Depth(m): 447.50
LITHOLOGY: DOLERITE;
Piece No. : PCES 1 (1-7), 2A (10-18), 2B (19-37), 2C (39-50),
2D (51-70), 2E (70-79), 2F (80-85), 2G (84-93),
2H (93-102), 2I (103-111), 2J (112-125),
2K (126-136), 2L (137-150);
Texture : SAME AS CORE 53-1;
Structure : MORE SILICA/ZEOL VEINS THAN IN CORE 53-1,PCE 2F SPLI
ALONG THE SURFACE OF A VEIN;
Alteration : SLIGHTLY TO MOD
PCES 1 & 2E-2G MODERATELY ALTERED;
Comments : MEDIUM-LIGHT GRAY(N6);
Replacement: SILICA
CLAY
ZEOLITE
Leg : 64 Top/Bottom Interval(mm): 0/1450 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 450.45
Core: 53 Top of Core Depth (m) : 446.00
Sect: 3 Top of Section Depth(m): 449.00
LITHOLOGY: DOLERITE;
Piece No. : PCES 1A (1-13), 1B (12-16), 1C (17-30), 1D (30-40),
1E (40-50), 1F (50-60), 1G (60-71), 1H (71-85),
1I (85-95), 1J (95-108), 1K (109-111), 1L (112-114),
1M (115-117), 1N (118-130), 1O (130-145);
Texture : SAME AS CORE 53-2,FINE-GRAINED,HOMOGENOUS,PCES 1M-1O
ARE SLIGHTLY FINER-GRAINED THAN PCES 1A-1L;
Structure : FEW VEINS,PCES 1D+1E NOT FRACTURED,MINOR VEINS
CONTAIN CALCITE;
Alteration : SLIGHTLY TO MOD
PCES 1D & 1G MODERATELY ALTERED;
Comments : MEDIUM-LIGHT GRAY(N6);
Replacement: CALCITE
Leg : 64 Top/Bottom Interval(mm): 0/1000 Analyst: Fornari, D.
Hole: 478 Sample Midpoint (m) : 451.50
Core: 53 Top of Core Depth (m) : 446.00
Sect: 4 Top of Section Depth(m): 450.50
LITHOLOGY: APHYRIC DOLERITE;
Piece No. : PCES 1A (1-13), 1B (13-31), 1C (32-46), 1D (46-53),
1E (53-61), 1F (62-75), 1G (75-98);
Texture : APHYRIC,FINE-GRAINED,SIMILAR TO CORE 53-3;
Structure : EXTENSIVE MICROFRACTURING IN PCE 1D WHICH SOMEWHAT
CONTINUES INTO PCES 1C+1E;
Alteration : SLIGHTLY TO MOD
PCE 1D MODERATELY ALTERED;
Comments : MEDIUM GRAY TO MEDIUM-LIGHT GRAY(N5-N6);
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 456.50
Core: 54 Top of Core Depth (m) : 455.00
Sect: 1 Top of Section Depth(m): 455.00
LITHOLOGY: APHYRIC BASALT OR DOLERITE;
Piece No. : PCES 1A (0-10), 1B (10-20), 2A (21-22), 2B (23-25),
2C (25-28), 2D (28-30), 3 (32-38), 4A (41-51),
4B (50-100), 5A (102-103), 5B (103-106),
5C (106-113), 5D (113-119), 6 (120-141);
Texture : APHYRIC,COARSE-GRAINED WITH GRAINSIZE PROGRESSIVELY
DECREASING THROUGH SECTION,SPECKLED APPEARANCE,
PROPORTION OF FELDSPAR INCREASES DOWN THE SECTION;
Structure : FRACTURES LINED WITH GREEN CLAY;
Alteration : MOD
Comments : MEDIUM GRAY(N5),ROCK AT BOTTOM OF THIS SECTION
AND THROUGHOUT REST OF CORE IS DIFFERENT FROM
THAT IN CORE 53, THE LATTER HAS A FINE-GRAINED FRESH
DOLERITIC APPEARANCE WHEREAS THIS SECTION HAS A
"SPECKLED" APPEARANCE WITH ALTERED FELDSPAR LATHS
LYING IN A DK GREEN CPX-OL MATRIX;
Phenocrysts: FELDSPAR ( 50%)
1-4MM LONG & 0.5-1MM WIDE LATHS IN PCE 1A & 1.5MM
IN LENGTH & <0.5MM WIDE IN PCE 6,PROPORTION
INCREASES DOWN THE SECTION,ALTERED;
Groundmass : CLINOPYROXENE
DARK;
OLIVINE
TOTAL % CPX & OL IS 50%;
Replacement: CLAY
GREEN;
Leg : 64 Top/Bottom Interval(mm): 0/ 800 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 457.30
Core: 54 Top of Core Depth (m) : 455.00
Sect: 2 Top of Section Depth(m): 456.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1A (0-45), 1B (45-58), 2 (60-80);
Texture : APHYRIC, VERY FINE-GRAINED, GRAINSIZE GENERALLY
LESS THAN 0.5MM;
Structure : BOTTOM PART OF INTERVAL BECOMES FRAGMENTED, CHLORITE
VEIN IN PIECE 1A;
Alteration : MOD;
Comments : MEDIUM LIGHT GREY BASALT, CONTINUATION OF SECT. 1;
Replacement: CLAY MINERALS
ABUNDANT;
CHLORITE
ID UNCERTAIN FOR CHLORITE,FILLS VEIN;
Leg : 64 Top/Bottom Interval(mm): 800/ 950 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 457.45
Core: 54 Top of Core Depth (m) : 455.00
Sect: 2 Top of Section Depth(m): 457.30
LITHOLOGY: BASALT;
Piece No. : PCE 3A (80-83), 3B (83-87), 3C (86-90),
3D (91-93), 3E (91-94);
Texture : APHANITIC;
Structure : SMALL FRAGMENTS COMPRISING APHANITIC GREENISH GRAY
(5 G 6/1) BASALT;
Alteration : MOD;
Comments : GREENISH GRAY COLOR (5 G 6/1), PCE 1A CONTAINS
CONTACT BETWEEN APHANITIC BASALT (CONT. OF 0-80)
AND MORE COARSELY XTLLINE BASALT (90-140);
Vesicles : Size(mm): Percent: RARE
Location: Filling: SMECTITE
SMEC-LINED VESICLES OR CAVITIES;
Leg : 64 Top/Bottom Interval(mm): 950/1450 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 457.95
Core: 54 Top of Core Depth (m) : 455.00
Sect: 2 Top of Section Depth(m): 457.45
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 4A (95-105), 4B (105-111), 4C (112-125),
4D (122-144), 4E (140-145);
Texture : FINE-GRAINED,APHYRIC;
Alteration : MOD;
Comments : CONTACT: INTERVAL 80-95: UPPER UNIT (0-80)
APPEARS TO BE CHILLED AGAINST LOWER UNIT (95-145)
WITH POSSIBLE REGROWTH OF FELDSPARS IN LOWER UNIT
(SEE T.S. DESCRIPTION);
Groundmass : FELDSPAR
Size(mm): 1-2
VERY ELONGATE, RANDOMLY ORIENTED LATHS IN PCES
4A AND 4B, BUT IN PCES (4C,4D, & 4E) THEY ARE
LESS WELL DEVELOPED;
Replacement: CHLORITE
Minerals Replaced: MAFICS
ID UNCERTAIN FOR CHLORITE;
PYRITE
AT 121CM, 143 CM;
Leg : 64 Top/Bottom Interval(mm): 0/1500 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 459.50
Core: 54 Top of Core Depth (m) : 455.00
Sect: 3 Top of Section Depth(m): 458.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1A (0-34), 1B (30-41), 1C (39-53), 1D (50-65),
1E (65-93), 1F (90-141), 1G (139-150);
Texture : MEDIUM-GRAINED APHYRIC BASALT,GRAINSIZE <2MM &
GENERALLY 0.5-1MM,COARSER-GRAINED AREA OCCURS IN PCE
1G(PROBABLY ALTERATION PROCESS);
Structure : OCCASIONAL VEINS CONTAIN CALCITE & SEVERAL FRACTURES
ARE COATED WITH PYR;
Alteration : MOD
LIGHT COLORATION POSSIBLY DUE TO ALTERATION,COARSE
-GRAINED AREA IN PCE 1G MAY BE DUE TO ALTERATION;
Comments : MEDIUM-LIGHT GRAY(N6);
Groundmass : FELDSPAR
WHITE,OPAQUE;
MAFICS
ALTERED;
Replacement: CALCITE
IN FRACTURES & IN MATRIX;
CALCITE
Leg : 64 Top/Bottom Interval(mm): 0/1100 Analyst: Saunders, A.
Hole: 478 Sample Midpoint (m) : 460.60
Core: 54 Top of Core Depth (m) : 455.00
Sect: 4 Top of Section Depth(m): 459.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1A (0-45), 1B (43-75), 1C (75-93), 1D (93-100),
1E (98-104), 1F (104-110);
Texture : APHYRIC, MEDIUM-GRAINED, BECOMES MORE MAFIC TOWARD
BASE OF SECTION (N5/N6 AT TOP, N4 AT BOTTOM),
TEXTURALLY AND MINERALOGICALLY VERY SIMILAR TO
SECTION 1;
Alteration : MOD;
Comments : MEDIUM GRAY (N5), CONTINUATION OF SECTION 3;
Replacement: CALCITE
PYRITE
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