Leg : 45 Top/Bottom Interval(mm): 1180/1500 Analyst: Natland, J.
Hole: 395 Sample Midpoint (m) : 88.20
Core: 10 Top of Core Depth (m) : 83.70
Sect: 3 Top of Section Depth(m): 87.88
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (118-125), 2 (127-136), 3 (139-144),
4 (145-150);
Texture : APHYRIC, FINE-GRAINED, PCE 4 SLIGHTLY MORE
XTLLINE;
Structure : FRESH CRACKED RIGHT EDGE ON PCE 1, TINY CRACKS
ON SAWED SURFACE WITH CELAD? IN PCE 1;
Alteration : SLIGHTLY
SLIGHTLY ALTERED IN PCE 1;
MOD
MOD ALTERED IN PCES 2-4, PCE 2 HAS PALE BROWN
ALTERATION RIND, PCE 4 HAS ALTERATION RIND ON
ONE SURFACE,
PCE 3 HAS WIDER ALTERATION RIND;
Vesicles : Size(mm): Percent: <1
Location: Filling: CLAY
A FEW PINHOLE VESICLES FILLED WITH BLACK OR
GREEN CLAYS;
Replacement: CLAY MINERALS
CELADONITE
ID UNCERTAIN;
Leg : 45 Top/Bottom Interval(mm): 320/1500 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 94.73
Core: 11 Top of Core Depth (m) : 93.23
Sect: 1 Top of Section Depth(m): 93.55
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (32-40), 2 (42-48), 3 (50-58), 4 (60-67),
5 (69-75), 6 (77-82), 7 (84-91), 8 (94-100),
9 (102-110), 10 (112-119), 11 (122-127),
12 (130-135), 13 (137-142), 14 (144-150);
Texture : APHYRIC, FINE-GRAINED, PCE 2 NEARLY VITROPHYRIC WITH
AREAS OF PLATY QUENCH CRYSTALS OF PLAG, LARGE
VARIOLITE AREAS IN PCE 3 CHARACTERIZED BY LARGE
PLATY QUENCH CRYSTALS OF PLAG IN VITROPHYRIC
VARIOLITIC ARRANGEMENT, OVOID VARIOLITES UP TO 1-2CM
AND DARK GRAY IN PCE 3, LARGER PLAG QUENCH CRYSTALS
THAN IN OVOID VARIOLITES IN MATRIX OF PCE 3, PCES 2-
14 PART OF A QUENCHED SEQUENCE WITH STRIKINGLY LARGE
VARIOLITES FORMED OF VITROPHYRIC DARK-COLORED OVOIDS
IN MATRIX OF VITROPHYRIC MATERIAL WITH SLIGHTLY
LARGER PLATY QUENCH CRYSTALS OF PLAG, MOST STRIKING
VARIOLITIC STRUCTURES IN PCE 3+9+11, PCE 11
CONTAINS FRESHEST AND MOST CLEARLY GLASSY ZONE OF
SECTION, PCE 13 HAS A BIT OF GLASS ON ONE SURFACE,
VARIOLITES IN PCE 14;
Alteration : MOD
ABUNDANCE OF ALTERATION PRODUCTS, ALTERATION MOST
PROMINENT IN VESICLE AND VARIOLITE ZONES;
Comments : COOLING UNIT BOUNDARIES BETWEEN 1 AND 2 AND BETWEEN
11 AND 12, GNDMASS IS DARK GRAY;
Vesicles : Size(mm): <1 Percent: <1
Location: Filling: CLAY
IN PCE 1, VESICLES FILLED WITH BROWN CLAY.MINS?;
Size(mm): 1 Percent: 1
IN PCES 2-11;
SCARCE VESICLES IN PCES 12-14, VESICLES NOT
PRESENT IN VARIOLITE PCES;
Phenocrysts: PLAGIOCLASE ( <1%)
IN PCE 2, MICROPHENOS;
OLIVINE ( <<1%)
IN PCE 2, MICROPHENOS;
PLAG MICROPHENOS IN PCE 1, PLAG MICROPHENOS RARE,
OL VERY RARE;
Replacement: CLAY MINERALS
ABUNDANCE OF ALTERATION PRODUCTS;
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 96.23
Core: 11 Top of Core Depth (m) : 93.23
Sect: 2 Top of Section Depth(m): 94.73
LITHOLOGY: BASALT;
Piece No. : PCE 1 (0-8), 2 (10-15), 3 (15-20), 4 (20-25),
5 (27-31), 6 (33-38), 7 (33-38), 8 (33-38),
9 (39-43), 10 (39-43), 11 (44-48), 12A (49-54),
12B (54-60), 12C (60-68), 12D (68-74),
12E (74-78), 12F (78-86), 12G (86-93),
12H (94-101), 12I (101-110), 12J (110-117),
12K (116-120), 12L (130-136), 13 (128-132),
14 (133-136), 15 (137-142), 16 (143-150);
Texture : GENERALLY APHYRIC, FINE TO MEDIUM-GRAINED, WELL-
DEVELOPED PLAG QUENCH SHEATHS IN PCE 5, PLAG LATHS
IN PCES 12A-12L, POORLY DEVELOPED OVOID VARIOLITES
IN PCES 13-14 WHICH EXHIBIT TYPICAL RELATIONSHIP TO
VESICULAR BASALTS FOUND IN PILLOW LAVAS, APHANITIC
GNDMASS;
Structure : SURFACE CAVITIES WITH ARAGONITE?, DRUSES IN PCES 6-
7 AND 9-11, ALTERATION ALONG CARB FILLED FRACTURES
IN 12A-12L;
Alteration : MOD
IN PCES 1-4 AND 12D-12F AND 13-16;
EXT
IN PCES 5-10,
SECONDARY CARB COATINGS ON SOME SURFACES IN 1-2,
ALTERATION MOST PROMINENT IN VESICULAR AND
VARIOLITIC PCES;
Comments : COOLING UNIT BOUNDARY ABOVE 13, PCES 12A-12L PART OF
SINGLE FLOW, GNDMASS DARK GRAY IN COLOR AND
LOCALLY ALTERED TO GRAY BROWN;
Vesicles : Size(mm): <1 Percent: 1
Location: Filling: CLAY
IN PCE 1, FILLED WITH MAINLY BROWN CLAY.MINS;
Size(mm): <1 Percent: 5
Location: Filling: CARB
IN PCES 15+16, SOME VESICLES FILLED WITH CARB AND
OTHER SECONDARY PRODUCTS;
Phenocrysts: OLIVINE
PLAGIOCLASE
OL? MICROPHENOS WEATHERED BROWN WITH PLAG
MICROPHENOS IN PCES 6-7 AND 9-11;
Replacement: CLAY MINERALS
ARAGONITE
CARBONATE
Leg : 45 Top/Bottom Interval(mm): 1100/1500 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 104.25
Core: 12 Top of Core Depth (m) : 102.75
Sect: 1 Top of Section Depth(m): 103.85
LITHOLOGY: CUTTINGS;
Comments : SECTION IS ENTIRELY CUTTINGS CONSISTING OF CHIPS
OF BASALT GLASS AND LITHIC BASALT AND SERPENTINITE
AND FORAMS, BASALT GLASS AND LITHIC GLASS ARE 95% OF
CUTTINGS, GLASS IS SO ABUNDANT THAT IT IS PROBABLE
THAT CUTTINGS REPRESENT THIN GLASSY FLOWS TOO
BRITTLE TO BE CORED;
Leg : 45 Top/Bottom Interval(mm): 0/1040 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 105.29
Core: 12 Top of Core Depth (m) : 102.75
Sect: 2 Top of Section Depth(m): 104.25
LITHOLOGY: CUTTINGS;
Comments : 0-104CM, SIMILAR TO THOSE IN 12-1;
Leg : 45 Top/Bottom Interval(mm): 1050/1500 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 105.75
Core: 12 Top of Core Depth (m) : 102.75
Sect: 2 Top of Section Depth(m): 105.30
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1A (105-116), 1B (116-122), 1C (123-128),
1D (129-130), 1E (128-136), 2 (134-150);
Texture : APHYRIC, FINE-GRAINED, FELTY PLAG LATHS EVIDENT
THROUGHOUT BUT NO PLAG MICROPHENOS PRESENT, PCE 1B
VARIOLITIC;
Alteration : FRESH
IN PCE 1A;
MOD
IN PCES 1B-2, GNDMASS VARIOUSLY ALTERED TO
BROWNISH GRAY;
Comments : UNIFORM, GNDMASS GRAY;
Vesicles : Size(mm): 0.5-1 Percent:
Location: Filling: CELAD,CALCITE
Location: Filling: CLAY.MIN
SLIGHTLY VESICULAR, VESICLES FILLED WITH GREEN
MATERIAL AND CELAD? IN PCE 1A AND CALCITE IN PCE
1B AND 1D-1E AND CLAY.MIN IN PCES 1D-1E, VESICLES
IN PCE 2 FILLED WITH BROWN MATERIAL IN WEATHERED
AREAS AND WHITE MATERIAL IN LESS ALTERED AND PALE
GREEN AND DARK GREEN IN FRESHER PORTIONS, SOME
VESICLES IN WEATHERED PARTS OF PCE 2 HAVE BROWN
RIMS AND WHITE-GRAY CONES;
Phenocrysts: PLAGIOCLASE ( 0%)
Replacement: CALCITE
ID UNCERTAIN;
CLAY MINERALS
CELADONITE
ID UNCERTAIN;
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 395 Sample Midpoint (m) : 114.25
Core: 13 Top of Core Depth (m) : 112.75
Sect: 1 Top of Section Depth(m): 112.75
LITHOLOGY: CUTTINGS;
Comments : CUTTINGS-MORE THAN 95% BASALT GLASS AND LITHIC
BASALT CHIPS AND THE REST SERPENTINITE-GABBRO GRAINS
AND A SMALL FRACTION OF FORAMS;
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 395 Sample Midpoint (m) : 115.75
Core: 13 Top of Core Depth (m) : 112.75
Sect: 2 Top of Section Depth(m): 114.25
LITHOLOGY: CUTTINGS;
Comments : CUTTINGS->95% BASALT GLASS AND LITHIC BASALT CHIPS-
THE REST SERPENTINITE-GABBRO GRAINS AND SMALL
FRACTION OF FORAMS;
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 395 Sample Midpoint (m) : 117.25
Core: 13 Top of Core Depth (m) : 112.75
Sect: 3 Top of Section Depth(m): 115.75
LITHOLOGY: CUTTINGS;
Comments : >95% BASALT GLASS AND LITHIC BASALT CHIPS-
THE REST SERPENTINITE-GABBRO GRAINS AND SMALL
FRACTION OF FORAMS;
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Natland, J.
Hole: 395 Sample Midpoint (m) : 118.75
Core: 13 Top of Core Depth (m) : 112.75
Sect: 4 Top of Section Depth(m): 117.25
LITHOLOGY: CUTTINGS;
Comments : >95% BASALT GLASS AND LITHIC BASALT CHIPS-
THE REST SERPENTINITE-GABBRO GRAINS AND SMALL
FRACTION OF FORAMS;
Leg : 45 Top/Bottom Interval(mm): 0/ 140 Analyst: Natland, J.
Hole: 395 Sample Midpoint (m) : 118.89
Core: 13 Top of Core Depth (m) : 112.75
Sect: CC Top of Section Depth(m): 118.85
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (0-8), 2 (10-14);
Texture : APHYRIC, PCE 1 MEDIUM-GRAINED AND PCE 2 FINE-
GRAINED, TINY PLAG LATHS VISIBLE USING HAND LENS-
FAIRLY UNIFORMLY DISTRIBUTED, PLAG MOST APPARENT ON
ROUND SIDE WHERE IT APPEARS AS CRISS-CROSSED NEEDLES
AND LATHS, MANGANESE OXIDE? DENDRITES ON LOWER END;
Alteration : MOD
OBLIQUE UPPER END IS CRACK SURFACE WITH THIN
LAYER OF FERRUGINOUS CLAYS PRODUCED BY WEATHERING;
Replacement: CLAY MINERALS
Leg : 45 Top/Bottom Interval(mm): 700/1500 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 123.26
Core: 14 Top of Core Depth (m) : 121.76
Sect: 1 Top of Section Depth(m): 122.46
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (70-75), 2 (75-79), 3 (80-85), 4 (86-98),
5 (99-107), 8 (120-125), 9 (125-135),
10 (136-141), 11 (144-147);
Texture : APHYRIC, FINE-GRAINED, VARIOLITIC IN PCE 8+10+11 -
VARIOLITES OXIDIZED, TINY NEEDLES AND LATHS OF
PLAG FORM RADIATING AND CRISS-CROSSED PATTERNS
ESPECIALLY VISIBLE ON ROUNDED SURFACES OF PCES 1-4,
PCE 9 COARSER-GRAINED THAN EITHER 8 OR 10, PCES
8+10+11 APHANITIC;
Alteration : MOD
IN PCES 1-3+5+8+10+11;
FRESH
IN PCES 4+9;
Comments : AT LEAST 3 COOLING UNITS REPRESENTED BY THIS CORE
-BOUNDARIES ABOVE PCES 7+10;
Vesicles : Size(mm): TO 2 Percent:
Location: Filling: CLAY,CALCITE
Location: Filling: CELAD
VESICULAR IN PCES 1-5 (SIZE<=1MM EXCEPT PCE 3
WHICH HAS VESICLES 1-2MM), VESICLES IN PCES 1-3
FILLED WITH FERRUGINOUS CLAYS AND DARK GREEN
CLAYS(SAPONITE?) AND WHITE CALCITE, VESICLES IN
PCES 4-5 FRESH AND FILLED WITH GREEN CELAD?;
Replacement: CALCITE
CELADONITE
ID UNCERTAIN;
CLAY MINERALS
Leg : 45 Top/Bottom Interval(mm): 700/1500 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 123.26
Core: 14 Top of Core Depth (m) : 121.76
Sect: 1 Top of Section Depth(m): 122.46
LITHOLOGY: BASALT;
Piece No. : PCE 6 (108-114), 7 (115-119);
Texture : NEARLY GLASSY IN PCE 7;
Structure : PCE 6 VEINED, FRACTURES IN PCE 7 PARALLEL TO
EXTERIOR (UPPER) SURFACE AND FILLED WITH PALAG AND
CLAY.MINS, PCE 7 IS OUTSIDE OF PILLOW;
Alteration : MOD;
Comments : AT LEAST 3 COOLING UNITS REPRESENTED BY CORE, PCE
6 IS DUSKY BROWN;
Replacement: CLAY MINERALS
PALAGONITE
Leg : 45 Top/Bottom Interval(mm): 0/ 410 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 131.68
Core: 15 Top of Core Depth (m) : 131.27
Sect: 1 Top of Section Depth(m): 131.27
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (4-9), 3 (18-23), 4 (26-30), 5 (33-41);
Texture : APHYRIC, FINE-GRAINED;
Alteration : MOD;
Comments : SECTION 15-1 SINGLE COOLING UNIT;
Vesicles : Size(mm): Percent: 5
Location: Filling: CALCITE,CLAY
FILLED WITH CALCITE AND FERRUGINOUS CLAYS
ALTHOUGH SOME ARE EMPTY;
Replacement: CALCITE
LIMONITE
Leg : 45 Top/Bottom Interval(mm): 110/1500 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 132.77
Core: 15 Top of Core Depth (m) : 131.27
Sect: 1 Top of Section Depth(m): 131.38
LITHOLOGY: VOLCANIC GLASS;
Piece No. : PCE 2 (11-15);
Texture : GLASSY;
Structure : SPHERULITIC FRACTURE, BLACK OUTER CRACKS CONTAIN
LIGHT BROWN PALAG;
Alteration : FRESH;
Comments : TOP OF COOLING UNIT AT TOP OF PCE 2, SECTION 15-1
MAY REPRESENT SINGLE COOLING UNIT;
Replacement: PALAGONITE
Leg : 45 Top/Bottom Interval(mm): 440/1470 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 132.74
Core: 15 Top of Core Depth (m) : 131.27
Sect: 1 Top of Section Depth(m): 131.71
LITHOLOGY: BASALT;
Piece No. : PCE 6 (44-49), 7A (52-60), 7B (60-69), 7C (60-69),
7D (69-79), 7E (80-93), 7F (92-95), 7G (95-98),
8A (101-110), 8B (110-119), 8C (119-121),
8D (121-126), 8E (126-132), 8F (135-139),
8G (139-146), 8H (143-147);
Texture : FINE-GRAINED, NEEDLES AND LATHS FORM RADIATING AND
CRISS-CROSSED PATTERNS IN 7A-7G WHICH ARE VISIBLE
ON ROUNDED SIDE OF PCES WITH HAND LENS,
PREDOMINANTLY APHYRIC;
Structure : PROMINENT CALCITE-FILLED CRACK;
Alteration : FRESH
IN PCES 7E-7G AND 8B-8H;
MOD
IN PCES 6-7D AND 8A;
PROMINENT CALCITE-FILLED CRACK HAS FAIRLY
INTENSELY ALTERED BASALT ADJACENT TO IT ON EITHER
SIDE FOR ABOUT 2CM FROM 7B-7D (ALTERATION IS
PRIMARILY OXIDATION TO BROWNISH GRAY COLORS);
Comments : SECTION 15-1 MAY REPRESENT SINGLE COOLING UNIT;
Vesicles : Size(mm): Percent: <1
VESICLES PRESENT;
Groundmass : PLAGIOCLASE
PLAG NEEDLES AND LATHS FORM RADIATING AND
CRISS-CROSSED PATTERNS IN 7A-7G WHICH ARE VISIBLE
ON ROUNDED SIDE OF PCE WITH HAND LENS;
Phenocrysts: OLIVINE
OL PHENO IN PCE 7E;
Replacement: CALCITE
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Rhodes, M.
Hole: 395 Sample Midpoint (m) : 134.27
Core: 15 Top of Core Depth (m) : 131.27
Sect: 2 Top of Section Depth(m): 132.77
LITHOLOGY: BASALT;
Piece No. : PCE 1A (3-6), 1B (6-13), 2 (16-23), 3 (24-29),
4 (30-34), 5 (35-38), 6A (40-45), 6B (40-45),
7 (46-52), 8 (54-61), 9A (62-65), 9B (65-73),
10 (76-80), 11 (80-85), 12A (86-93), 12B (93-100),
13 (104-107), 14 (110-118), 15A (120-126),
15B (126-135), 16 (138-143), 17 (144-150);
Texture : FINE-GRAINED, SMALL PLAG LATHS EVIDENT ON EXTERIOR
SURFACES OF PCE 1-9B AND 12A-16, VARIOLITIC IN PCE
17 - VARIOLITES DARK GRAY CIRCULAR PATCHES SET IN
BROWNISH OXIDIZED MATRIX;
Structure : CRACKS FILLED WITH CLAY.MINS AND CALCITE AND IRON
HYDROXIDE;
Alteration : MOD
IN PCES 1A AND 2-5 AND 7 AND 9A AND 10-11 AND
12B-13 AND 17;
EXT
IN PCE 8;
FRESH
IN PCES 1B AND 6A-6B AND 9B AND 12A AND 14-16;
Comments : HOMOGENOUS, COOLING UNIT BOUNDARIES INFERRED
BETWEEN PCES 9A AND 9B AND BETWEEN PCES 10 AND 11,
PCE 17 MAY BE BOTTOM OF ONE FLOW UNIT OR TOP OF
ANOTHER, BROWN GNDMASS;
Vesicles : Size(mm): 1 Percent:
Location: Filling: CLAY.MINS,CALCITE
Location: Filling: IRON HYDROXIDE
VESICLES IN PCES 10-11 FILLED WITH CLAY.MINS AND
CALCITE AND IRON HYDROXIDE;
Phenocrysts: PLAGIOCLASE
SMALL PLAG LATHS EVIDENT ON EXTERIOR SURFACES
OF PCES 1-9B AND 12A-16;
Replacement: CLAY MINERALS
CALCITE
FERROUS HYDROX MINS
Leg : 45 Top/Bottom Interval(mm): 750/1500 Analyst: Lawrence, J.
Hole: 395 Sample Midpoint (m) : 142.07
Core: 16 Top of Core Depth (m) : 140.57
Sect: 1 Top of Section Depth(m): 141.32
LITHOLOGY: CUTTINGS;
Comments : >95% BASALT GLASS AND LITHIC BASALT CHIPS - THE
REST SERPENTINITE-GABBRO GRAINS AND SMALL FRACTION
OF FORAMS;
Groundmass : PLAGIOCLASE
Replacement: CLAY MINERALS
Leg : 45 Top/Bottom Interval(mm): 0/1450 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 143.52
Core: 16 Top of Core Depth (m) : 140.57
Sect: 2 Top of Section Depth(m): 142.07
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (2-5), 2 (6-10), 3 (11-20), 4 (21-27),
5 (29-31), 6 (33-36), 7 (38-46), 8 (48-50),
9 (50-59), 10 (60-66), 11 (67-72), 12 (74-79),
13 (80-85), 14 (86-91), 15 (86-91), 16 (86-91),
17 (86-91), 18 (92-99), 19 (100-103), 20 (104-110),
21 (112-117), 22 (120-127), 23 (128-135),
24 (136-144);
Texture : APHYRIC, VERY FINE-GRAINED, VARIOLITES IN PCES 5-11,
SMALL NEEDLES AND LATHS OF PLAG FORM CRISS-CROSSED
AND RADIATING PATTERNS VISIBLE ON EXTERIOR SURFACES
OF ESPECIALLY PCES 20-24 GLASSY SURFACES IN PCES 19-
24;
Structure : CLAY-FILLED CRACK IN PCE 21;
Alteration : MOD
IN PCES 2-11 AND 13-17 AND 19-24;
FRESH
IN PCES 1 AND 12 AND 18;
GNDMASS IS OXIDIZED AND BROWNISH IN PCES 5-11,
THIN ZONES OF ALTERED BASALT ADJACENT TO CLAY-
FILLED CRACK IN PCE 21;
Comments : COOLING UNIT BOUNDARIES BETWEEN PCES 4 (AN APHYRIC
BASALT) AND 5 (A VARIOLITIC BASALT) AND ABOVE 19
WHICH HAS GLASSY SURFACE, SEVERAL COOLING UNITS
REPRESENTED BY PCES 5-11;
Groundmass : PLAGIOCLASE
Replacement: CLAY MINERALS
Leg : 45 Top/Bottom Interval(mm): 0/ 490 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 144.06
Core: 16 Top of Core Depth (m) : 140.57
Sect: 3 Top of Section Depth(m): 143.57
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (3-10), 2 (11-16), 3 (18-21), 4 (23-30),
5 (32-35), 6 (36-40), 7 (42-48);
Texture : APHYRIC, FINE-GRAINED, TINY PLAG NEEDLES APPARENT
ON EXTERIOR SURFACES;
Structure : DARK CLAYS FILL VEINLET-LIKE CRACKS IN PCE 4;
Alteration : MOD
IN PCES 2-7, AN ALTERATION ZONE IS ADJACENT
TO A CRACK IN PCE 7;
FRESH
IN PCE 1;
Comments : MAY REPRESENT SINGLE COOLING UNIT BEGINNING WITH
16-2 PCE 19, THIS SECTION WAS NOT ACTUALLY
RECOVERED BUT EXISTS BECAUSE SPACERS WERE ADDED TO
SECTION 1 AND 2 REQUIRING SHIFTING OF SEVERAL PCES
OF BASALT INTO THIS SECTION;
Groundmass : PLAGIOCLASE
Replacement: CLAY MINERALS
Leg : 45 Top/Bottom Interval(mm): 0/ 550 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 150.63
Core: 17 Top of Core Depth (m) : 150.08
Sect: 1 Top of Section Depth(m): 150.08
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (4-14), 2 (16-24), 3 (25-32), 4 (33-40),
5 (41-48), 6 (49-54);
Texture : APHYRIC, FINE-GRAINED, PCES 1-2 AND 6 VARIOLITIC,
PCES 1 AND 6 HAVE GLASSY RINDS, PCES 3-5 HAVE POORLY
DEVELOPED VARIOLITES;
Structure : CLAY-FILLED FRACTURES, PROBABLE FRAGMENTS OF PILLOW
LAVAS;
Alteration : MOD;
Vesicles : Size(mm): Percent: 2-3
Location: Filling: CLAY.MINS
IN PCE 1, MOST FILLED WITH CLAY.MINS;
Location: Filling: CALCITE
PCE 2 CONTAINS VUGS WITH DRUSY LININGS OF
SECONDARY MINERALS INCLUDING CALCITE;
Replacement: CLAY MINERALS
CALCITE
Leg : 45 Top/Bottom Interval(mm): 550/ 720 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 150.80
Core: 17 Top of Core Depth (m) : 150.08
Sect: 1 Top of Section Depth(m): 150.63
LITHOLOGY: GABBRO;
Piece No. : PCE 7 (55-71);
Texture : COARSE-GRAINED (0.5-1.5CM), FELDSPATHIC;
Structure : VEIN CONTAINING PINK SECONDARY MINERAL, SHEARS
COMMON;
Alteration : EXT
PERHAPS HYDROTHERMALLY ALTERED, MAFICS ALTERED TO
CHLOR OR CLAY.MINS AND AMPH;
Replacement: CHLORITE
CLAY MINERALS
AMPHIBOLE
Leg : 45 Top/Bottom Interval(mm): 330/ 420 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 160.04
Core: 18 Top of Core Depth (m) : 159.62
Sect: 1 Top of Section Depth(m): 159.95
LITHOLOGY: PLAG-OL PHYRIC BASALT;
Piece No. : PCE 1 (33-42);
Texture : PHYRIC, MEDIUM-GRAINED, A BIT COARSER-GRAINED
THAN NORMALLY SEEN IN PILLOW BASALTS;
Alteration : MOD
NEAR UPPER AND LOWER EDGES;
FRESH
IN BETWEEN EDGES;
Phenocrysts: PLAGIOCLASE ( 15%)
Size(mm): TO 0.5
OLIVINE ( 2%)
Size(mm): TO 1
CLINOPYROXENE
Size(mm): 1
Leg : 45 Top/Bottom Interval(mm): 420/1500 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 161.12
Core: 18 Top of Core Depth (m) : 159.62
Sect: 1 Top of Section Depth(m): 160.04
LITHOLOGY: SERPENTINIZED PERIDOTITE;
Piece No. : PCE 2A (44-53), 2B (53-62), 2C (62-73), 2D (73-85),
2E (82-101), 2F (101-112), 2G (112-128),
2H (129-138), 2I (138-148);
Texture : LARGE AUGEN UP TO 10MM LONG OF ENSTATITE(20-40%)
DEFINING A TECTONIC FABRIC INCLINED ABOUT 45 DEGREES
FROM THE HORIZONTAL, SMALL (1-3MM) GREEN CPX GRAINS
AND 1-2% CHROMITE PRESENT, ENST MUCH MORE ABUNDANT
THAN CPX, PLAG ABSENT;
Structure : OL SHEARED;
Alteration : SLIGHTLY
15-30% SERPENTINIZED, PCES 2A-2D LEAST
SERPENTINIZED(15-20% SERP), 1CM THICK ORANGISH
7.5YR6/6) WEATHERED ZONE AT TOP OF PCE 2A,
BECOMES INCREASINGLY SERPENTINIZED WITH DEPTH;
Groundmass : OLIVINE
PREDOMINANTLY SERPENTINIZED OL;
CLINOPYROXENE
PLAGIOCLASE ( 0%)
ENSTATITE
CHROMITE ( 1-2%)
Replacement: SERPENTINITE
Minerals Replaced: OL
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 162.62
Core: 18 Top of Core Depth (m) : 159.62
Sect: 2 Top of Section Depth(m): 161.12
LITHOLOGY: SERPENTINIZED PERIDOTITE;
Piece No. : PCE 1 (0-5), 2 (6-17), 15 (62-69), 16 (70-83),
17A (84-97), 17B (97-108), 17C (108-119),
17D (119-126), 17E (126-135), 17F (135-140),
17G (140-146), 18 (147-150);
Texture : AUGEN PRIMARILY ENST BUT EMERALD GREEN CPX (SIZE UP
TO 5MM) IS PRESENT AS LARGE GRAINS AS WELL, PLANAR
FABRIC NOT APPARENT IN DISTRIBUTION OF AUGEN,
CHROMITE APPEARS MOLDED(LATER CRYSTALLIZATION) TO
ENST;
Structure : EN ECHELON CARB-FILLED VEINLETS ABUNDANT IN PCE 2,
WEATHERED ZONE AT TOP WITH CARB FILLED SHEARS IN
PCE 15, CARB VEIN IN PCE 17G,GNDMASS MATRIX SHEARED;
Alteration : SLIGHTLY
SERPENTINITE BORDERING EACH END OF BRECCIA-BASALT
ZONE INTENSELY ALTERED TO RUSTY ORANGE COLOR,
ALTERED ZONES MERGE WITH DARK SERPENTINITE (NEARLY
BLACK) AND THEN WITH GREEN SERPENTINITE BOTH ABOVE
AND BELOW, WEATHERED ZONE AT TOP WITH CARB-FILLED
SHEARS IN PCE 15;
Comments : SERPENTINIZED PERIDOTITE OF 18-1 CONTINUES INTO PCE
1 AND 2 OF THIS SECTION, SYMMETRIC ALTERATION ZONES
MAY HAVE SOMETHING TO DO WITH POSSIBLE DIKE IN
BRECCIA ZONE;
Groundmass : OLIVINE
GNDMASS MATRIX SHEARED AND COMPOSED OF OL
AND SERPENTINE;
CLINOPYROXENE
Size(mm): TO 5
ENSTATITE (E %)
CHROMITE
Replacement: CALCITE
CARBONATE
SERPENTINITE
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 162.62
Core: 18 Top of Core Depth (m) : 159.62
Sect: 2 Top of Section Depth(m): 161.12
LITHOLOGY: GABBRO-SERPENTINITE-BASALT BRECCIA;
Piece No. : PCE 3 (18-23), 4 (24-27), 5 (28-31), 14 (58-61);
Texture : POORLY SORTED, STRIKINGLY LARGE (2-2.5CM) ROUNDED
INCLUSIONS IN PCE 5, WELL-ROUNDED CLASTS, GNDMASS
MATRIX IS RECRYSTALLIZED NANNOFOSSIL LIMESTONE,
LIGHT COLORED, 30-40% MATRIX, 60-70% PLUTONIC
CLASTS (SERPENTINITE AND GABBRO) AND A FEW BASALT
CLASTS AND LARGE PLAG GRAINS, AT LEAST 1 MEDIUM-
GRAINED APHYRIC BASALT CLAST;
Alteration : FRESH;
Comments : BRECCIA WAS CORED BOTH ABOVE AND BELOW BASALT, ONLY
VERY TINY COCCOLITHS CAN BE SEEN IN SMEAR SLIDES OF
THE MATRIX AND THEY ARE VERY SCARCE;
Groundmass : PLAGIOCLASE
Leg : 45 Top/Bottom Interval(mm): 0/1500 Analyst: Melson, W.
Hole: 395 Sample Midpoint (m) : 162.62
Core: 18 Top of Core Depth (m) : 159.62
Sect: 2 Top of Section Depth(m): 161.12
LITHOLOGY: PLAG-OL-CPX PHYRIC BASALT;
Piece No. : PCE 6 (32-36), 7 (36-40), 8 (40-44), 9 (44-48),
10 (49-54), 11 (49-54), 12 (49-54), 13 (54-58);
Texture : PLAG-OL-CPX PHYRIC, GLASSY RINDS IN PCE 6 AND 8;
Alteration : MOD;
Comments : BASALT BROKEN INTO SEVERAL PCES BUT ORIGINALLY A
SINGLE ROCK, BASALT MAY HAVE BEEN DIKE WHICH
INTRUDED ALONG WEAK BRECCIA ZONE, ALTERNATIVELY
BASALT IS BOULDER WITHIN BRECCIA;
Phenocrysts: PLAGIOCLASE ( 30%)
Size(mm): 0.8
OLIVINE ( 1-5%)
CLINOPYROXENE ( <1%)
EMERALD-GREEN, SMALL AND ROUNDISH AND VERY RARE;
PHENOS APPEAR TO DECREASE IN SIZE AND ROUNDING
FROM 6-13;
Leg : 45 Top/Bottom Interval(mm): 0/ 120 Analyst: Fujii, T.
Hole: 395 Sample Midpoint (m) : 169.27
Core: 19 Top of Core Depth (m) : 169.15
Sect: 1 Top of Section Depth(m): 169.15
LITHOLOGY: SERPENTINITE;
Piece No. : PCE 1 (4-12);
Texture : ENST AUGEN UP TO 6MM;
Structure : ABUNDANT CALCITE VEINLETS;
Alteration : EXT;
Comments : GNDMASS IS ORANGE-BROWN;
Groundmass : ENSTATITE (E %)
CHROMITE
ID UNCERTAIN FOR CHROMITE;
Replacement: CALCITE
Leg : 45 Top/Bottom Interval(mm): 120/ 210 Analyst: Fujii, T.
Hole: 395 Sample Midpoint (m) : 169.36
Core: 19 Top of Core Depth (m) : 169.15
Sect: 1 Top of Section Depth(m): 169.27
LITHOLOGY: GABBRO-SERPENTINITE-BASALTIC BRECCIA;
Piece No. : PCE 2 (12-21);
Texture : FRAGMENTS UP TO 3CM, LOWER PORTION APHYRIC, NO
VARIOLITES, LOWER PORTION APHANITIC, CALCITE
CEMENTED, SIMILAR TO BRECCIAS OF 18-2, HAS
SERPENTINIZED PERIDOTITE AND GABBRO AND APHYRIC
BASALT FRAGMENTS, LOWER PORTION IS FRESH BASALT,
LOWER PORTION SLIGHTLY VESICULAR, UPPER PORTION
HAS CARB VEINLETS, SLIGHTLY ALTERED IN UPPER
PORTION;
Structure : UPPER PORTION HAS CARB VEINLETS;
Vesicles : LOWER PORTION SLIGHTLY VESICULAR;
Comments : CONTACT WITH BRECCIA SHARP WITH A THIN WEATHERED
EDGE TO BASALT COLORED PALE BROWN, BASALT IS
CLEARLY A CLAST IN BRECCIA - NOT A DIKE - AND IS
NOT A FINE-GRAINED CONTACT TO BASALTS BELOW;
Groundmass : PLAGIOCLASE
OLIVINE
Replacement: CALCITE
CARBONATE
Leg : 45 Top/Bottom Interval(mm): 210/1500 Analyst: Fujii, T.
Hole: 395 Sample Midpoint (m) : 170.65
Core: 19 Top of Core Depth (m) : 169.15
Sect: 1 Top of Section Depth(m): 169.36
LITHOLOGY: PLAG-OL PHYRIC BASALT;
Piece No. : PCE 3 (22-30), 4 (31-40), 5 (41-50), 6 (50-56),
7 (55-67), 8 (69-80) 9 (81-85), 10 (86-91),
11 (92-100), 12 (102-106), 13 (107-113),
14 (114-117), 15 (118-128), 16 (130-140),
17 (141-150);
Texture : PLAG-OL PHYRIC, NO CLEAR VARIATIONS IN GNDMASS
TEXTURE, ALL FAIRLY FINE-GRAINED AND HOMOGENOUS;
Structure : CALCITE VEINLETS IN PCES 13-17;
Alteration : EXT
EXT ALTERED IN PCES 5 AND 7;
MOD
IN REMAINING SECTION;
Comments : NO OBVIOUS COOLING UNIT BOUNDARIES IN CORE, NOT
POSSIBLE TO SAY WHETHER BASALTS REPRESENT 1 OR MORE
DIKES OR EXTRUSIVE PILLOW BASALTS;
Vesicles : Size(mm): TO 1 Percent: 1-2
Location: Filling: CLAY.MIN,CARB
IN PCES 3+7-9+11+13-17;
Size(mm): TO 1 Percent: 1-2
Location: Filling: MUD
IN PCE 4;
Size(mm): TO 1 Percent: 1-2
EMPTY IN PCE 10;
Phenocrysts: PLAGIOCLASE
OLIVINE
Replacement: CLAY MINERALS
CARBONATE
CALCITE
Leg : 45 Top/Bottom Interval(mm): 0/ 380 Analyst: Graham, A.
Hole: 395 Sample Midpoint (m) : 179.03
Core: 20 Top of Core Depth (m) : 178.65
Sect: 1 Top of Section Depth(m): 178.65
LITHOLOGY: PLAG-OL PHYRIC BASALT;
Piece No. : PCE 1 (4-10), 2 (10-16), 3 (15-20), 4 (21-27),
5 (28-38);
Texture : PLAG-OL PHYRIC, MEDIUM-GRAINED, GLASSY PATCHES;
Structure : A FEW THIN VEINS OF RED-BROWN MATERIAL (PALAG? OR
IRON OXIDES AND CLAYS) WITHIN ALL PCES;
Alteration : SLIGHTLY
IN PCES 1-3+5;
MOD
IN PCE 4;
RED-BROWN PATCHES (PALAG? OR IRON OXIDES AND
CLAYS);
Vesicles : Size(mm): <1 Percent: <1
VESICLES OFTEN FILLED WITH WHITE INTERIOR LINING
AND OTHERS LINED WITH PALE BLUE, VESICLES IN PCE 4
MORE NOTICEABLE BECAUSE IT IS MORE ALTERED;
Phenocrysts: PLAGIOCLASE ( 15%)
Size(mm): TO 5
PHENOS LARGE (UP TO 0.5CM IN GLOMEROPORPHYRITIC
CLUMPS);
OLIVINE ( <2%)
Size(mm): 2-3
OL PHENOS FAIRLY SMALL AND RARE;
Replacement: CLAY MINERALS
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