Leg : 65 Top/Bottom Interval(mm): 0/ 70 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 110.07
Core: 13 Top of Core Depth (m) : 105.50
Sect: 4 Top of Section Depth(m): 110.00
LITHOLOGY: SEDIMENT;
PLAG MOD PHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1A (7-15), 1B (17-20), 2 (21-27), 3 (30-42),
4 (43-46), 5 (48-56), 6 (60-66), 7 (70-84),
8 (86-95);
Texture : MEDIUM-GRAINED, GRAIN SIZE INCREASING FROM PCE 1
DOWN CORE;
Structure : A 1MM VEIN WITH WELL CRYSTALLIZED RADIATING ZEOLITE
(PHILLIPSITE?) AT TOP OF PCE 1A, A 2MM CALCITE VEIN
IN PCE 3, MASSIVE;
Alteration : FRESH;
Comments : GREY, PCES(1A,1B) ARE SURROUNDED BY DARK BROWN MUD,
BASALT-SEDIMENT CONTACT OBSCURED DURING DRILLING;
Vesicles : Size(mm): <1 Percent: <1
Location: Filling: SMECTITE
ID BLUE-GREEN SMECTITE UNCERTAIN;
Phenocrysts: PLAGIOCLASE ( 5%)
Size(mm): <5
OLIVINE
POSSIBLY RARE, LARGELY ALTERED OL INTERGROWN WITH
PLAG PHENOS;
Replacement: SMECTITE
ZEOLITE
PHILLIPSITE
ID ZEOLITE COULD BE PHILLIPSITE;
Leg : 65 Top/Bottom Interval(mm): 0/1300 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 116.30
Core: 14 Top of Core Depth (m) : 115.00
Sect: 1 Top of Section Depth(m): 115.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1A (0-5), 1B (5-7), 1C (6-8), 1D (8-10),
2A (12-21), 2B (20-23), 2C (25-35), 2D (35-50),
3A (52-60), 3B (59-74), 4A (75-77), 4B (78-80),
4C (80-91), 4D (91-97), 5 (100-110), 6A (112-116)
6B (113-123), 6C (122-130);
Texture : MEDIUM-GRAINED, APHYRIC, PCE 1A IS VITROPHYRIC;
Structure : VEINS 3-5MM THICK, PCES(3,6) HEAVILY VEINED WITH
CALCITE AND SMECTITE AND IN PLACES HAVE ACICULAR
CRYSTALS OF ZEOLITE(?);
Alteration : MODERATE;
Comments : PCE 4D APPEARS NOT TO BELONG TO 4A-C, PCE 1A MAY
BELONG TO COOLING UNIT OF PREVIOUS CORE SAMPLE OR
REPRESENT AN INDEPENDENT COOLING UNIT, GREY;
Vesicles : Size(mm): Percent: 1 1
Location: 5-10 Filling: SMEC,CALCITE
INCREASE IN VESICLES DOWN CORE;
Phenocrysts: PLAGIOCLASE ( <1%)
PCE 1A HAS 5% PLAG(2MM LATHS) CLOSE TO CHILL
MARGIN;
Replacement: CALCITE
SMECTITE
ZEOLITE
ACICULAR CRYSTALS OF ZEOLITE, ID UNCERTAIN;
Leg : 65 Top/Bottom Interval(mm): 0/1230 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 117.73
Core: 14 Top of Core Depth (m) : 115.00
Sect: 2 Top of Section Depth(m): 116.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1A (0-6), 1B (6-10), 1C (10-30), 1D (30-40),
1E (40-47), 1F (47-56), 2A (58-61), 2B (63-66),
2C (67-74), 3A (76-82), 3B (82-88), 3C (89-95),
3D (96-102), 4A (105-115), 4B (116-119),
4C (116-123);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED;
Structure : VEINS OF CALCITE WITH SMECTITE 2-3MM THICK IN PCES
(5, 1A-1E), PCE 3A HAS VEIN OF SMECTITE AND PYRITE,
PCE 3C HAS A CALCITE VEIN AND PCES(4B-4C) ARE VEINED
WITH CALCITE;
Alteration : FRESH;
Comments : GREY, PCES(2A-2C,3A-3D,4A-4C) DON'T BELONG TOGETHER;
Vesicles : Size(mm): Percent: 1-2
Location: Filling: SMEC,CALCITE
Replacement: CALCITE
SMECTITE
PYRITE
Leg : 65 Top/Bottom Interval(mm): 0/1400 Analyst: Flower, M.
Hole: 483 Sample Midpoint (m) : 125.40
Core: 15 Top of Core Depth (m) : 124.00
Sect: 1 Top of Section Depth(m): 124.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1 (0-8), 2 (10-16), 3A (17-24), 3B (40-50),
EC (52-70), 4 (72-76), 5 (79-85), 6A (86-105),
6B (105-120), 6C (120-132), 6D (132-140);
Texture : APHYRIC, PCE 1 IS MEDIUM-GRAINED SPARSELY PLAG
PHYRIC, PCE 2 IS MOD PLAG PHYRIC WITH PLAG CLOTS
MORE ABUNDANT THAN IN PCE 1;
Structure : PCES (3B,4,6) HAVE VEINS OF CALCITE AND SMECTITE(?)
UP TO 30MM THICK(ASSOCIATED WITH SMALL VUGS)
FREQUENTLY WITH SULPHIDE, VEINS ARE ZONED WITH
CALCITE AT CENTRE AND SMECTITE(?) AT EDGES(& ZEOL?),
MASSIVE;
Alteration : SLIGHT;
PCES(1-3) GENERALLY FRESH, REST SOME ALTERATION
IS SEEN;
Comments : GREY, PCE 2 MAY REPRESENT A SEPARATE LITHOLOGIC
UNIT, NO COOLING MARGIN SEEN;
Phenocrysts: PCE 2 HAS MORE ABUNDANT PHENOS THAN PCE 1;
Replacement: SULFIDE
CALCITE
SMECTITE
PCES(6A-D) YELLOW-BROWN SURFACES PROBABLY REFLECT
(ASE I%)
Size(mm): N PERVASIV
Minerals Replaced: E SMECTITE IN GROUNDMASS;
ZEOLITE
Leg : 65 Top/Bottom Interval(mm): 0/1100 Analyst: Flower, M.
Hole: 483 Sample Midpoint (m) : 126.60
Core: 15 Top of Core Depth (m) : 124.00
Sect: 2 Top of Section Depth(m): 125.50
LITHOLOGY: PLAG SPARSELY PHYRIC TO APHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1A (0-70), 1B (70-90), 1C (90-103),
1D (105-110);
Texture : SPARSELY PHYRIC TO APHYRIC;
Structure : MASSIVE;
Alteration : FRESH;
Comments : GREY;
Phenocrysts: PLAGIOCLASE
Size(mm): TO 2
Leg : 65 Top/Bottom Interval(mm): 1140/1280 Analyst: Flower, M.
Hole: 483 Sample Midpoint (m) : 126.78
Core: 15 Top of Core Depth (m) : 124.00
Sect: 2 Top of Section Depth(m): 126.64
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 2 (114-128);
Texture : APHYRIC, VARIABLE GRAIN SIZE, FINE-GRAINED TO GLASSY
Alteration : FRESH;
Comments : PROBABLY COOLING BREAK;
Leg : 65 Top/Bottom Interval(mm): 1300/1400 Analyst: Flower, M.
Hole: 483 Sample Midpoint (m) : 126.90
Core: 15 Top of Core Depth (m) : 124.00
Sect: 2 Top of Section Depth(m): 126.80
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 3 (130-140);
Texture : FINE-GRAINED, APHYRIC;
Alteration : FRESH;
Comments : LIGHT GREY, UNIT CONTINUES INTO 15-3;
Replacement: SMECTITE
GENERALLY FRESH BUT PROBABLY PERVASIVE GROUNDMASS
SMECTITE CAUSES YELLOWISH OUTER SURFACE OF CORE;
Leg : 65 Top/Bottom Interval(mm): 0/ 780 Analyst: Flower, M.
Hole: 483 Sample Midpoint (m) : 127.78
Core: 15 Top of Core Depth (m) : 124.00
Sect: 3 Top of Section Depth(m): 127.00
LITHOLOGY: PLAG-CPX MOD PHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1A (1-16), 1B (14-26), 1C (26-45), 2 (46-49),
3A (55-70), 3B (70-78);
Texture : MOD PHYRIC, SUBSIDIARY OPHITIC AUGITE IN PCE 1, PCE
2 IS FINE-GRAINED AND APHYRIC;
Structure : FRACTURES IN PCE(1C) WITH GREEN SMECTITE AND
TALC(?,GREENISH PHASE WITH SOAPY FEEL) AS COATINGS,
MASSIVE;
Alteration : FRESH
ALTERATION LESS PERVASIVE THAN IN PREVIOUS UNIT;
Comments : GREY, CONTINUED FROM CORE 15-2;
Phenocrysts: COMBINATION ( 3-5%)
Size(mm): TO 7
INCLUDES PLAG-CPX GLOMEROCRYSTIC CLOTS WITH
SUBSICIARY OPHITIC AUGITE IN PCE 1, PCE 2 HAS NO
PHENOCRYSTS;
Replacement: SMECTITE
Leg : 65 Top/Bottom Interval(mm): 0/1470 Analyst: Zolotarev, B.
Hole: 483 Sample Midpoint (m) : 134.47
Core: 16 Top of Core Depth (m) : 133.00
Sect: 1 Top of Section Depth(m): 133.00
LITHOLOGY: PLAG VERY SPARSELY PHYRIC BASALT
Piece No. : PCES 1A (2-7), 1b (6-11), 2a (13-22), 2b (19-82),
3 (84-93), 4A (95-98), 4B (102-118), 5 (120-130),
6 (134-147);
Texture : SPARSELY PHYRIC, MEDIUM-GRAINED, SOME GLOMEROPHYRIC
AGGREGATES OF PLAG AND CPX;
Structure : SOME FRACTURES FILLED WITH GREENISH-GREY SMECTITE &
WHITE CARBONATE AND VERY RARE PYRITE, WHEN FRACTURES
ONLY FILLED WITH DARK GREENISH-GREY SMECTITE THE
FRACTURE HAS A WHITE-GREY HALO OF ALTERATION-PCE 5,
SMALL DIKE(?) OF WHITE-GREY FINE-GRAINED APHYRIC
BASALT IN PCES(1A,1B,2A) WITH THICKNESS OF 1CM AND
4CM;
Alteration : FRESH
WHITE-GREY ALTERATION HALO IN PCE 5;
Vesicles : Size(mm): Percent: 0
NONE OBVIOUS;
Phenocrysts: PLAGIOCLASE ( <<1%)
Size(mm): TO 5
Replacement: SMECTITE
CARBONATE
PYRITE
Leg : 65 Top/Bottom Interval(mm): 0/1480 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 135.98
Core: 16 Top of Core Depth (m) : 133.00
Sect: 2 Top of Section Depth(m): 134.50
LITHOLOGY: PLAG VERY SPARSELY PHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1A (1-16), 1B (16-31), 2 (33-40), 3A (41-55),
3B (55-69), 4 (71-74), 5 (76-85), 6 (86-90),
7 (91-96), 8A (96-102), 8B (100-107), 8C (107-121),
8D (122-148);
Texture : DOMINANTLY FINE TO MEDIUM-GRAINED, SPARSELY PHYRIC,
PCES(3A,3B,8A) HAVE CHILLED MARGINS, CLOTS OF PLAG;
Structure : FEW FRACTURES SOME VERY STRAIGHT-PCE 8D, VEINS OF
CALCITE & SMECTITE & ZEOLITE(?) & MINOR SULFIDE UP
TO 3MM THICK, PCES(3A,3B) ARE MOSTLY BASALT
INSTRUSIONS WITH SLIGHTLY DIFFUSE UPPER BUT VERY
CLEAR LOWER CONTACT, MASSIVE, DIKELETS IN PCE 8A AND
TOP OF 1A;
Alteration : FRESH;
Comments : PCES(3A,3B) ARE MOSTLY BASALT INTRUSION WITH
SLIGHTLY DIFFUSE UPPER BUT VERY CLEAR LOWER CONTACT
SHOWN BY CHILLED MARGIN WITH VERY THIN APOPHYSIS AND
SPARSE LARGE VESICLES IN CHILLED MARGIN OF INTRUSION
PCE 3A HAS 1CM THICK SUBHORIZONTAL DIKELET WITH
CHILLED MARGIN AND SLIGHTLY VESICULAR CENTER(SIMILAR
TO PCE 1, 16-3), DIFFUSE DIKELET(?) IN TOP OF PCE 1A
SIMILAR TO INTRUSIVE RELATIONSHIPS IN 16-1 PCES(1A,
18,2,5,);
Vesicles : Size(mm): <1 Percent: <1
RARE VESICLES, PCES(3A,3B) HAVE SPARSE LARGER
VESICLES IN CHILLED MARGIN OF INTRUSION, PCE 8A
HAS DIKELET WITH SLIGHTLY VESICULAR CENTER;
Phenocrysts: PLAGIOCLASE ( <<1%)
Size(mm): <4
OLIVINE
POSSIBLY VERY RARE OL PHENOS IN CLOTS WITH PLAG;
Replacement: CALCITE
SMECTITE
ZEOLITE
ID ZEOLITE UNCERTAIN;
SULFIDE
MINOR SULFIDE UP TO 3MM THICK;
Leg : 65 Top/Bottom Interval(mm): 0/ 130 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 136.13
Core: 16 Top of Core Depth (m) : 133.00
Sect: 3 Top of Section Depth(m): 136.00
LITHOLOGY: PLAG VERY SPARSELY PHYRIC BASALT;
MASSIVE;
Piece No. : PCE 1 (0-13);
Texture : MAIN BASALT FINE GRAINED, SMALL PCES OF BASALT ARE
SET IN MATRIX OF GREEN SMECTITE(?) AND SULFIDE AND
POSSIBLY SEDIMENTS;
Structure : MASSIVE, PCE IS VEIN-LIKE BASALT RESEMBLING
SCORIACEIOUS CRUST OF LAVA FLOW;
Alteration : FRESH
ALTERATION HALO CLOSE TO VEIN-LIKE BASALT;
Comments : GREY, PROBABLY TOP OF COOLING UNIT WITH COMPLEX
CONTACT MARGIN, BASALT SOMEWHAT RESEMBLING
SCORIACEOUS OF LAVA FLOW(COLOR, VESICLES, VERY
IRREGULAR BOUNDARIES), SMALL PCES(PROTRUSIONS ?) OF
THIS BASALT ARE SET IN MATRIX OF GREEN SMECTITE(?)
AND SULFIDE AND POSSIBLY SEDIMENTS;
Vesicles : VESICULAR BASALT IS BORDERED ON TOP BY BASALT
SOMEWHAT RESEMBLING MAIN FINE-GRAINED BASALT;
Phenocrysts: PLAGIOCLASE ( <<1%)
Size(mm): <4
Replacement: SMECTITE
ID SMECTITE UNCERTAIN;
SULFIDE
Leg : 65 Top/Bottom Interval(mm): 0/ 180 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 142.18
Core: 17 Top of Core Depth (m) : 142.00
Sect: 1 Top of Section Depth(m): 142.00
LITHOLOGY: SEDIMENT (MUDSTONE);
Piece No. : PCE 1 (0-18);
Comments : DARK BROWN MUCK;
Leg : 65 Top/Bottom Interval(mm): 200/1500 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 143.50
Core: 17 Top of Core Depth (m) : 142.00
Sect: 1 Top of Section Depth(m): 142.20
LITHOLOGY: APHYRIC BASALT;
MASSIVE;
Piece No. : PCES 2 (20-23), 3 (24-26), 4 (29-34), 5 (36-40),
6 (41-55), 7A (56-80), 7B (80-121), 7C (114-144),
7D (141-150);
Texture : APHYRIC, FINE-GRAINED(TOP) TO COARSER-GRAINED DOWN
CORE;
Structure : MASSIVE, VEINS UP TO 3MM WIDE FILLED DOMINANTLY BY
SMECTITE SOME CARB(THINNER HAIRLINE CRACKS AT CENTRE
OF THICKER VEINS) AND POSSIBILY SOME ZEOLITE, A
COOLING CONTACT(DIKLET ?) IN SMALL PCE OF PCE3;
Alteration : FRESH
GENERALLY FRESH;
Comments : ACTUAL CONTACT SEDIMENT-BASALT NOT PRESERVED, PCE 7D
IS CONTINUOUS WITH PCE 1A OF 17-2;
Replacement: SMECTITE
CARBONATE
ZEOLITE
Leg : 65 Top/Bottom Interval(mm): 0/1450 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 144.95
Core: 17 Top of Core Depth (m) : 142.00
Sect: 2 Top of Section Depth(m): 143.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1A (2-36), 1B (35-44), 2 (45-51), 3A (53-66),
3B (65-77), 3C (78-89), 3D (89-104), 4 (106-128),
5 (132-145);
Texture : APHYRIC, MEDIUM-GRAINED, BECOMES COARSER-GRAINED
THAN 17-1;
Structure : MASSIVE, SOME FRACTURES USUALLY VERY THIN (BUT IN
PCE 1A UP TO 4MM) AND FILLED BY CARBONATE AND
SMECTITE;
Alteration : FRESH;
Comments : CONTINUES DIRECTLY FROM 17-1, ALL SAMPLES SIMILAR,
PCE 1A(17-2) IS CONTINUOUS WITH PCE 7D(17-1);
Phenocrysts: PLAGIOCLASE
Size(mm): TO 1.5
VERY RARE AND SMALL-MICROPHENOS;
Replacement: CARBONATE
SMECTITE
Leg : 65 Top/Bottom Interval(mm): 0/ 150 Analyst: Zolotarev, B.
Hole: 483 Sample Midpoint (m) : 145.15
Core: 17 Top of Core Depth (m) : 142.00
Sect: 3 Top of Section Depth(m): 145.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE;
Piece No. : PCE 1 (0-15);
Texture : MEDIUM-GRAINED, APHYRIC;
Structure : MASSIVE, FRACTURES VERY THIN AND FILLED WITH CARB &
SMECTITE;
Alteration : FRESH;
Comments : GREY, SAME AS 17-2;
Vesicles : Size(mm): Percent: 0
NONE OBVIOUS;
Replacement: CARBONATE
SMECTITE
Leg : 65 Top/Bottom Interval(mm): 0/1300 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 156.80
Core: 18 Top of Core Depth (m) : 151.00
Sect: 4 Top of Section Depth(m): 155.50
LITHOLOGY: SEDIMENT;
Comments : INTERVALS (0-99), (111-130);
Leg : 65 Top/Bottom Interval(mm): 990/1500 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 157.00
Core: 18 Top of Core Depth (m) : 151.00
Sect: 4 Top of Section Depth(m): 156.49
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (99-111), 2A (130-137), 2B (137-140),
2C (138-150);
Texture : APHYRIC, FINE TO MEDIUM-GRAINED;
Structure : THINLY VEINED WITH CALCITE AND PYRITE AND SMECTITE;
Alteration : SLIGHTLY;
Comments : GREY;
Vesicles : Size(mm): <1 Percent: 1
Location: Filling: SMECTITE,CALCITE
Location: Filling: PYRITE
PCE 2A HAS LARGE 5MM VESICLE(VUG ?) FILLED WITH
CALCITE AND PYRITE;
Replacement: SMECTITE
CALCITE
PYRITE
Leg : 65 Top/Bottom Interval(mm): 0/ 240 Analyst: Morrison, M. Ann
Hole: 483 Sample Midpoint (m) : 157.24
Core: 18 Top of Core Depth (m) : 151.00
Sect: 5 Top of Section Depth(m): 157.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-7), 2 (10-15), 3 (16-24);
Texture : APHYRIC, GRAIN SIZE INCREASES FROM PCES 1-3;
Structure : PCE 3 HAS THIN CALCITE(?) LINED FRACTURE THAT
TERMINATES IN A VEIN ALONG WHICH THE PCE HAS BROKEN,
THE FRACTURE CONTAINS SMECTITE AND CALCITE AND
ZEOLITE(?);
Alteration : SLIGHT;
Comments : APPEARS TO BE OCNTINUATION OF UNIT OF BASE 18-4;
GREY;
Vesicles : Size(mm): 0.5-1 Percent: <1
Location: Filling: SMECTITE
VESICALS SCARCE, FOUND IN PCES(2-3);
Replacement: SMECTITE
IN GROUNDMASS;
ZEOLITE
ID ZEIOLITE UNCERTAIN-WHITE, NO REACTION WITH HCL,
CRYSTALLINE AND NOT FIBROUS COULD BE QUARTZ;
Leg : 65 Top/Bottom Interval(mm): 0/ 100 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 160.10
Core: 19 Top of Core Depth (m) : 160.00
Sect: 1 Top of Section Depth(m): 160.00
LITHOLOGY: APHYRIC BASALT;
VESICULAR;
Piece No. : PCE 1 (0-10);
Texture : APHYRIC, MEDIUM-GRAINED;
Alteration : FRESH;
Comments : GREY;
Vesicles : Size(mm): 1 Percent: 5
Location: Filling: SMECTITE
VESICULAR BASALT;
Replacement: SMECTITE
Leg : 65 Top/Bottom Interval(mm): 0/ 60 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 169.06
Core: 20 Top of Core Depth (m) : 169.00
Sect: 1 Top of Section Depth(m): 169.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (0-6);
Texture : APHANITIC;
Alteration : FRESH;
Comments : GREY; IDENTICAL TO PCE 1 FROM 19-1, NO CONTACT
VISIBLE BETWEEN PCE 1 AND REST OF CORE BUT OBVIOUS
BREAK IN UNITS;
Leg : 65 Top/Bottom Interval(mm): 170/1500 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 170.50
Core: 20 Top of Core Depth (m) : 169.00
Sect: 1 Top of Section Depth(m): 169.17
LITHOLOGY: PLAG-OL-PYX MOD PHYRIC BASALT;
Piece No. : PCES 2 (7-17), 3 (28-36), 4 (27-32), 5 (34-44),
6 (45-53), 7 (55-61), 8 (65-69), 9 (70-80),
10 (82-87), 11 (89-94), 12 (96-103), 13 (100-106),
14 (117-130), 15 (132-136), 16 (137-149);
Texture : MOD PHYRIC, IN PLACES THE PLAG-OL-CPX ARE IN
GLOMEROPHYRIC CLOTS WHERE THE OL(<4MM) IS FRESH AND
GREEN IN COLOR, PCE 6 HAS CLOTS OF PLAG-OL, PCE 13
HAS GLSSY MARGIN(CA 1CM THICK) BUT WITH ABRUPT
CONTACT WITH PHYRIC BASALT;
Structure : MINOR VEINING WITH SMECTITE;
Alteration : FRESH;
Comments : GREY;
Vesicles : Size(mm): Percent: <1
Location: Filling: SMECTITE
Phenocrysts: PLAGIOCLASE ( 5-7%)
Size(mm): 4-6
PCE 5 HAS 6MM GLOMEROCRYSTIC CLOT OF PLAG AND CPX;
OLIVINE
Size(mm): 1-4
SLIGHTLY ALTER(1-3MM), IN PLACES WHERE IN CLOTS
THE OL IS FRESH AND GREEN IN COLOR AND LARGE
(<4MM), PCE 6 HAS A 6X3MM GREEN (CPX OR OL) PHENO
AND CLOTS OF PLAG-OL;
CLINOPYROXENE
LESSER ABUNDANCE THAN OL, GLOMEROCRYSTIC CLOT(6MM)
OF PLAG AND CPX IN PCE 5;
Groundmass : GROUNDMASS (S FIN%)
Size(mm): E TO MEDIU
Replacement: SMECTITE
Leg : 65 Top/Bottom Interval(mm): 0/ 690 Analyst: Zolotarev, B.
Hole: 483 Sample Midpoint (m) : 171.19
Core: 20 Top of Core Depth (m) : 169.00
Sect: 2 Top of Section Depth(m): 170.50
LITHOLOGY: PLAG-CPX-OL MOD PHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1 (1-6), 2 (8-11), 3 (15-24), 4 (26-32),
5 (34-40), 6 (41-46), 7 (48-55), 8 (56-68);
Texture : MOD PHYRIC, FINE-GRAINED WITH PCES(7,8) VERY FINE-
GRAINED;
Structure : MASSIVE, FRACTURES ARE THIN AND FILLED WITH SMECTITE
AND CARBONATE AND VERY RARE PYRITE;
Alteration : FRESH
SOME PARTS ARE FRESH, PCES(6-8) ALTERATION VARIES;
Comments : GREY, PCES (6-8) GREY TO DARK GREY AND ARE POSSIBLY
A NEW COOLING UNIT OR MAYBE COOLING MARGIN AT
CONTACT WITH NEW COOLING UNIT, PCES(1-5) ARE
SIMILAR TO 20-1, MINERALOGICAL COMPOSITION OF
PCES(6-8) IS THE SAME AS REST OF CORE;
Vesicles :
Location: Filling: SMECTITE,CARB
THERE ARE SOME VESICLES WITH PCES(6-8) MORE
VESICULAR;
Phenocrysts: PLAGIOCLASE ( 3-5%)
Size(mm): 3-4
CLINOPYROXENE ( <1%)
Size(mm): TO 2
OLIVINE ( <1%)
Size(mm): TO 2
IN PCES(6-8) THE CONTENT OF ALL PHENOS ARE LESS &
SMALLER-SOMETIMES MICROPHYRIC;
Replacement: SERPENTINITE
MOST PART OF OLIVINE REPLACED BY SECONDARY
MINERALS
SMECTITE
FILLING FOR FRACTURES;
CARBONATE
PYRITE
VERY RARE AND ROUND AS MEMBRANCE AND SMALL GRAINS;
Leg : 65 Top/Bottom Interval(mm): 0/1440 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 179.44
Core: 21 Top of Core Depth (m) : 178.00
Sect: 1 Top of Section Depth(m): 178.00
LITHOLOGY: PLAG-OL-CPX MOD PHYRIC BASALT;
Piece No. : PCES 1 (1-10), 2 (12-21), 3A (22-27), 3B (27-31),
4 (33-41), 5 (43-49), 6 (50-56), 7 (57-62),
8 (64-68), 9 (72-77), 10 (80-83), 11 (86-91),
12 (93-102), 13 (104-111), 14 (114-118),
15A (120-124), 15B (125-133), 15C (86-91),
16 (140-144);
Texture : PHYRITIC, FINE-GRAINED, GLASSY MARGINS UP TO 0.8
CM THICK FOLLOWED INWARDS BY DARK GREY VARIOLOTIC
BASALT UP TO 10CM THICK AND COARSER GRAINED LIGHT
GREY MOTTLED BASALT IN THE INTERIOR, GLASS IN
GROUNDMASS;
Structure : HAIRLINE CRACKS FILLED WITH SMEC AND MOD ABUNDANT
PATCHES OF SULFIDE(PCES 12, 15), SUBHORIZONTAL
FRACTURES IN GLASSY MARGIN ARE FILLED WITH SMECTITE;
Alteration : FRESH
PCE 1 HAS THIN HALO ALONG HAIRLINE CRACK;
Comments : SERIES OF CA. 5 COOLING UNITS OF PORPHYRITIC FINE-
GRAINED BASALT IN EVERY RESPECT CONTINUING FROM
OVERLYING CORES 20-1,2, PROBABLY PART OF PILLOW LAVA
SERIES ENCOMPASSING MOST OF CORES 20 AND 21;
Vesicles : Size(mm): <1 Percent: <<1
Location: Filling: CARB,SMEC,CALCITE
OCCUR INWARDS FROM GLASSY MARGIN AND CENTRAL PART
MAY BE OPEN VESICLE FILLING REPLACEMENT OF OL AND
PROBABLY GROUNDMASS GLASS;
Replacement: CARBONATE
Minerals Replaced: OL
Phenocrysts: PLAGIOCLASE ( 5%)
Size(mm): <4
RARE LARGER PHENOS(CA. 7MM), ROUNDED (?),
(RYSTS%)
Size(mm): WITH MAFI
OLIVINE ( 1-2%)
Size(mm): <3
SINGLE AND GLOMEROCRYSTS, PARTLY RESORBED BUT
GENERALLY ALTERED TO GREEN SMECITE(?) & CALCITE;
CLINOPYROXENE ( <1%)
Size(mm): <5
GRASS-GREEN TRANSLUCENT, MOSTLY WITH PLAG;
SPINEL ( <<1%)
OLIVE COLORED MAFIC PHASE POSSIBLY FRESH OL OR
SOME SPINEL;
Replacement: CALCITE
Minerals Replaced: OL
SMECTITE
Minerals Replaced: OL
ID GREEN SMEC QUESTIONABLE, FILLING IN CRACKS;
SULFIDE
Leg : 65 Top/Bottom Interval(mm): 0/1500 Analyst: Zolotarev, B.
Hole: 483 Sample Midpoint (m) : 181.00
Core: 21 Top of Core Depth (m) : 178.00
Sect: 2 Top of Section Depth(m): 179.50
LITHOLOGY: PLAG-CPX-OL MOD PHYRIC BASALT;
Piece No. : PCES 1 (2-10), 2 (12-15), 3 (16-25), 4 (27-32),
5 (34-42), 6A (44-50), 6B (50-56), 6C (55-61),
7A (63-71), 7B (70-75), 8 (77-84), 9A (86-94),
9B (94-99), 10 (101-104), 11 (106-118),
12A (120-125), 12B (125-131), 13 (134-139),
14 (141-145), 15 (148-150);
Texture : MOD PHYRIC, FINE-GRAINED, SOME PLAG-CPX
GLOMEROPHYRIC AGGREGATES, THERE ARE 3 COOLING UNITS
WITH GLASSY MARGINS PCES(5 & 8);
Structure : SOME PCES(7A,7B) ARE FRACTURED AND FILLED WITH SMEC
AND CARB AND RARE PYRITE;
Alteration : FRESH
ALTERED SLIGHTLY TO MOD NEAR FRACTURES;
Comments : THERE ARE THREE COOLING UNITS, GREY;
THERE ARE THREE COOLING UNITS, GREY;
Vesicles : Size(mm): Percent: 1
Location: Filling: SMECTITE
Phenocrysts: PLAGIOCLASE ( 3-5%)
Size(mm): 2-3
SOME UP TO 5-6MM BUT VERY RARE;
CLINOPYROXENE ( <1%)
Size(mm): 1-2
OLIVINE ( 1%)
Size(mm): 1-2
Replacement: SMECTITE
Minerals Replaced: OL
CARBONATE
Minerals Replaced: OL
SERPENTINITE
Minerals Replaced: OL
ID SERPENTINE UNCERTAIN;
PYRITE
RARE;
Leg : 65 Top/Bottom Interval(mm): 0/ 800 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 181.80
Core: 21 Top of Core Depth (m) : 178.00
Sect: 3 Top of Section Depth(m): 181.00
LITHOLOGY: PLAG-CPX-OL MOD PHYRIC BASALT;
Piece No. : PCES 1 (2-11), 2 (13-33), 3 (35-43), 4 (47-60),
5 (62-66), 6 (69-74), 7 (77-80);
Texture : MOD PHYRIC, OPAQUES OCCUR AS POIKILITIC GRAINS(<2MM)
IN SOME LARGE PLAG PHENOS, PCE 2 APPEARS LESS PHYRIC
AND PCE 3 HAS A CURVED GLASSY MARGIN SUGGESTIVE OF A
PILLOW;
Structure : HARILINE CRACKS ARE FILLED WITH PYRITE(?);
Alteration : FRESH;
Comments : GREY, SIMILAR TO 21-1 AND 21-2, CONTACT OF BASALT
AND GLASS HAVE STEEL GREY COATING, PCES IN 2 ARE NOT
FITTED, POSSIBLY PILLOW LAVA UNIT;
Vesicles : Size(mm): 1 Percent: 1
Location: Filling: SMECTITE
Phenocrysts: PLAGIOCLASE ( 5%)
Size(mm): 1-4
POIKILITIC OPAQUES IN SOME PLAG PHENOS;
CLINOPYROXENE ( 1%)
OLIVINE
OL AS PHENOS QUESTIONABLE;
Replacement: CALCITE
SMECTITE
Leg : 65 Top/Bottom Interval(mm): 0/1500 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 184.00
Core: 22 Top of Core Depth (m) : 182.50
Sect: 1 Top of Section Depth(m): 182.50
LITHOLOGY: PLAG-CPX-OL MOD PHYRIC BASALT;
Piece No. : PCES 1 (1-15), 2 (16-20), 3A (23-25), 3B (25-35),
3C (35-42), 3D (43-50), 4 (52-65), 5 (67-71),
6A (73-80), 6B (80-90), 6C (90-96), 6D (97-103),
7 (105-111), 8 (113-124), 9 (125-130),
10A (132-140), 19B (140-148);
Texture : FINE-GRAINED, PHYRIC, GLASSY MARGINS <1CM THICK IN
PART GLASSY RINDS ARE SUBVERTICAL IN PCES (4-6D);
Structure : FRACTURES HIGHLY IRREGULAR AND LINED WITH SMECTITE &
PATCHY SULFIDE, GLASSY MARGINS IN PART HIGHLY
VESICULAR ON OUTSIDE(PCE 4) ARE REPLACED BY BLUE-
GREEN SMEC(?) ALONG CURVED SUBHORIZONTAL FRACTURES;
Alteration : FRESH;
Comments : DARK GREY, BASALT IS IN TWO COMPLETE(1-3D & 4-8) AND
THE TOP OF A THIRD(10A & 10B) COOLING UNIT WHICH
CONTINUES INTO NEXT SECTION(SAME PIECE), FROM
PETROGRAPHY AND TYPE AND THICKNESS OF COOLING UNIT
CORE 22-1 IS CONTINUATION OF CORES 20 & 21, POSSIBLY
PILLOW UNIT;
Vesicles :
Location: Filling: SMEC,PHIL
RARE VESICLES MARGINALLY OR COMPLETELY FILLED WITH
SMECTITE AND SOME BY SPHERICAL PHILLIPSITE(?)
ABOUT 5-10CM FROM GLASSY MARGINS;
Phenocrysts: PLAGIOCLASE ( 5%)
Size(mm): <3
RARE PLAG UP TO 8MM;
OLIVINE ( 1%)
Size(mm): <3
RARE OL(PCE 8) 6MM LONG, SOME FRESH OL BUT MOSTLY
REPLACED BY SMEC AND CALCITE;
CLINOPYROXENE ( 1%)
GRESS GREEN AND TRANSLUCENT, INTERGROWN WITH PLAG
IN GLOMEROCRYSTS <5MM, POSSIBLE INCREASE IN PHENOS
TOWARDS CENTER OF COOLING UNIT 1, POSSIBLY SOME
SPINEL(?);
SPINEL
ID SPINEL UNCERTAIN;
Replacement: SMECTITE
Minerals Replaced: OL
SMECTITE IS LIGHT BLUE-GREEN;
CALCITE
Minerals Replaced: OL
IN SOME ROCKS OL REPLACED ALMOST ENTIRELY BY
CALCITE;
Leg : 65 Top/Bottom Interval(mm): 0/1440 Analyst: Zolotarev, B.
Hole: 483 Sample Midpoint (m) : 185.44
Core: 22 Top of Core Depth (m) : 182.50
Sect: 2 Top of Section Depth(m): 184.00
LITHOLOGY: PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Piece No. : PCES 1 (1-10), 2 (12-17), 3A (20-30), 3B (30-37),
3C (38-43), 3D (44-54), 4 (57-58), 5 (61-66),
6A (68-74), 6B (72-80), 7A (82-90), 7B (89-95),
7C (96-100), 8 (104-106), 9 (109-115), 10 (116-121),
11 (123-127), 12A (130-136), 12B (137-143);
Texture : MOD PHYRIC, FINE-GRAINED, THERE ARE 3 COOLING UNITS
WITH GLASSY MARGIN, PLAG IS SPARSELY GLOMEROPHYRIC;
Structure : FRACTURED AND FILLED WITH SMECTITE AND CARBONATE AND
RARE PYRITE;
Alteration : SLIGHTLY
STRONG NEAR FRACTURES;
Comments : THREE COOLING UNITS WITH FIRST ONE CONTINUATION OF
22-1, DARK GREY;
Phenocrysts: PLAGIOCLASE ( 5%)
Size(mm): 2-3
RARE PLAG PHENO OF 5MM;
CLINOPYROXENE ( <1%)
Size(mm): 1-2
OLIVINE ( <1%)
Size(mm): 1-2
Replacement: SMECTITE
Minerals Replaced: OL
SERPENTINITE
Minerals Replaced: OL
SERICITE
Minerals Replaced: OL
ID UNCERTAIN FOR SERPENTINE;
CARBONATE
ID UNCERTAIN FOR CARB;
Leg : 65 Top/Bottom Interval(mm): 0/1500 Analyst: Morrison, M. Ann
Hole: 483 Sample Midpoint (m) : 187.00
Core: 22 Top of Core Depth (m) : 182.50
Sect: 3 Top of Section Depth(m): 185.50
LITHOLOGY: PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Piece No. : PCES 1 (4-14), 2 (18-22), 3 (25-34), 4 (36-44),
5 (46-55), 6 (56-62), 7 (65-75), 8 (77-87),
9 (90-95), 10 (97-103), 11A (110-115),
11B (115-121), 12A (122-129), 12B (130-137),
13 (138-147);
Texture : FINE-GRAINED, MOD PHYRIC, PLAG-FREQUENTLY
GLOMEROPHYRIC WITH OL & CPX IN PCES 1-10, THE BASALT
HAS A MOTTLED APPEARANCE MORE PRONOUNCED IN PCES
(1-5) THEN DECREASES TOWARDS PCE 10, NO OBVIOUS
RELATIONSHIP BETWEEN GLOMEROCRYSTS AND MOTTLING-MAY
BE DUE TO GROUNDMASS DEVITRIFICATION(?);
Structure : VEINS ARE THIN UP TO .5MM WIDE LINED BY SMECTITE AND
FILLED WITH PYRITE & CALCITE IN PCES(1-10) WITH PCE
1 COATED BY SMECTITE AND PYRITE, PCES(11,12) MAY BE
PILLOW AND ALSO CONTAIN FRACTURES OF SMECTITE AND
CALCITE AND PYRITE;
Alteration : FRESH;
Comments : THREE COOLING UNITS SEPARATED BY GLASS ON PCES(10,
11A,12B), DARK GREY, PCE 13 IS SIMILAR TO REST OF
SECTION;
Vesicles : Size(mm): 0.5 Percent: <<1
Location: Filling: SMEC,CALCITE
NO VESICLES OBVIOUS IN PCES 11-12;
Phenocrysts: PLAGIOCLASE ( 5%)
Size(mm): TO 3
PCE 12A HAS EUHEDRAL LATH 7MM LONG OF PLAG;
OLIVINE ( 1%)
Size(mm): 2-3
OCCURS BOTH AS ISOLATED CRYSTALS IN GROUNDMASS AND
IN GLOMEROCRYSTS WITH PLAG AND CPX, NOW OL IS
SMECTITE IN PCES 11-13;
CLINOPYROXENE ( TO 1%)
Size(mm): 1
Replacement: SMECTITE
CALCITE
OL ALMOST COMPLETELY REPLACED BY SMEC AND CALCITE;
PYRITE
TRACE PYRITE IN GROUNDMASS;
Leg : 65 Top/Bottom Interval(mm): 0/ 580 Analyst: Morrison, M. Ann
Hole: 483 Sample Midpoint (m) : 187.58
Core: 22 Top of Core Depth (m) : 182.50
Sect: 4 Top of Section Depth(m): 187.00
LITHOLOGY: PLAG-CPX-OL MODERATELY PHYRIC BASALT;
Piece No. : PCES 1A (0-6), 1B (7-13), 1C (14-17), 2A (20-26),
2B (24-35), 3 (40-58);
Texture : MOD PHYRIC, PCE 3 IS RUBBLY BASALT WITH TRACE OF
GLASS;
Structure : LARGE 5MM-1CM WIDE SMECTITE VEIN(IN BOTTLE);
Alteration : FRESH;
Comments : DARK GREY, SIMILAR TO 22-2;
Phenocrysts: COMBINATION ( 5%)
Size(mm): 1
COMBINATION OF PLAG-CPX-OL;
Replacement: SMECTITE
Leg : 65 Top/Bottom Interval(mm): 600/1500 Analyst: Morrison, M. Ann
Hole: 483 Sample Midpoint (m) : 188.50
Core: 22 Top of Core Depth (m) : 182.50
Sect: 4 Top of Section Depth(m): 187.60
LITHOLOGY: PLAG-CPX-OL MODERATELY PHYRIC BASALT;
MASSIVE;
Piece No. : PCES 4 (60-64), 5 (66-75), 6A (77-86), 6B (86-90),
6C (91-93), 6D (94-108), 6F (107-108), 7A (110-126),
7B (127-134), 7C (135-140), 8 (141-150);
Texture : MOD PHYRIC;
Structure : MASSIVE, SMECTITE AND PYRITE OR SMEC-CALCITE-PYRITE
VEINS-THIN <0.5MM WIDE;
Alteration : SLIGHT;
Comments : PCES 4-8 ARE DIFFERENT COOLING UNIT, PCE 4 HAS NO
GLASS BUT HAS BLUE-GREY SHEEN SEEN ON GLASS IN OTHER
SECTIONS, DARK GREY;
Vesicles : Size(mm): 1-2 Percent:
Location: Filling: SMEC, CALCITE
VESICLES ARE MAINLY IN PCES 6 AND 7;
Phenocrysts: PLAGIOCLASE ( 5%)
RARELY SOME PLAG PHENOS CONTAIN SOME SPINELS;
OLIVINE ( 2%)
Size(mm): 2-3
CLINOPYROXENE ( <<1%)
BOTH OL AND CPX APPEAR AS SEPARATE CRYSTALS AND
GLOMEROCRYSTS;
Replacement: SMECTITE
Minerals Replaced: OL
PCES 4-6 HAVE GROUNDMASS SMECTITE;
CALCITE
Leg : 65 Top/Bottom Interval(mm): 0/ 210 Analyst: Morrison, M. Ann
Hole: 483 Sample Midpoint (m) : 188.71
Core: 22 Top of Core Depth (m) : 182.50
Sect: 5 Top of Section Depth(m): 188.50
LITHOLOGY: PLAG-CPX-MOD PHYRIC BASALT;
Piece No. : PCES 1 (1-14), 2 (16-21);
Texture : MOD PHYRIC, PLAG-CPX SMALL ALTERED OL GLOMEROPHYRIC
CLOTS;
Structure : VEINS OF SMEC-CALCITE-PYRITE IN PCE 1;
Alteration : FRESH;
Comments : CONTINUATION OF BASALT IN 22-4;
Phenocrysts: PLAGIOCLASE ( 5%)
RARELY SOME PLAG PHENOS CONTAIN SMALL SPINELS;
CLINOPYROXENE ( <<1%)
BOTH OL & CPX APPEAR AS SEPARATE CRYSTALS AND
GLOMEROCRYSTS;
Replacement: SMECTITE
Minerals Replaced: OL
PCES(4-6) CONTAIN SOME GROUNDMASS SMECTITE;
CALCITE
Minerals Replaced: OL
Phenocrysts: COMBINATION ( 5-7%)
INCLUDES MAINLY PLAG, SOME CPX & SMALL ALTERED OL;
Replacement: SMECTITE
Minerals Replaced: OL
CALCITE
Minerals Replaced: OL
PYRITE
ALTERED GROUNDMASS CONTAINS SMECTITE AND PYRITE
AND OL REPLACED BY CARB AND/OR SMEC;
Leg : 65 Top/Bottom Interval(mm): 0/1500 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 188.50
Core: 23 Top of Core Depth (m) : 187.00
Sect: 1 Top of Section Depth(m): 187.00
LITHOLOGY: OL-PLAG PHYRIC BASALT;
Piece No. : PCES 1 (3-6), 2 (10-15), 3 (17-24), 4 (29-36),
5 (41-54), 6 (50-58), 7 (61-70), 8A (72-84),
8B (85-96), 8C (96-99), 8D (99-110), 8E (110-127),
8F (122-127), 8G (127-128), 8G (129-139),
9 (143-148);
Texture : MEDIUM-GRAINED, PHYRIC, OL PHENOS HAVE VISIBLE
SPINELS AS POIKILITIC GRAINS;
Structure : VEINS CONTAIN CALCITE SMECTITE AND SULPHIDES;
Alteration : FRESH TO SLIGHT;
Comments : GREY, POSSIBLE COOLING UNIT WITH CONCENTRATION OF
OL AND PLAG PHENOS NEAR BOTTOM;
Vesicles :
Location: Filling: SMEC, CALCITE
PCE 1-6 ARE VESICULAR;
Phenocrysts: COMBINATION ( 5-10%)
PHENOS APPEAR TO INCREASE 5% AT TOP TO 10% IN 8D-
8H WITH PLAG PHENOS RANGING IN SIZE FROM <1MM-5MM
AND OL PHENOS UP TO 9 OR 10MM(NOTABLY IN 8D-8H), O
PHENOS HAVE VISIBLE SPINELS(PLEONASTE ? CR-RICH) A
POIKILITIC GRAINS, OCCADIONALLY OL APPEARS
UNALTERED, THERE ARE ALSO CPX-PLAG & OL-PLAG
GLOMEROCRYSTS;
Replacement: CALCITE
Phenocrysts: SMECTITE
SULFIDE
Leg : 65 Top/Bottom Interval(mm): 0/1480 Analyst: Kudo, A.
Hole: 483 Sample Midpoint (m) : 189.98
Core: 23 Top of Core Depth (m) : 187.00
Sect: 2 Top of Section Depth(m): 188.50
LITHOLOGY: PLAG-OL PHYRIC BASALT;
Piece No. : PCES 1A (1-10), 1B (8-10), 1C (10-20), 2 (21-40),
3 (42-49), 4A (51-65), 4B (65-74), 5 (75-78),
6 (80-90), 7A (92-105), 7B (105-108), 7C (105-112),
8A (115-124), 8B (125-129), 9 (133-137),
10 (142-148);
Texture : PHYRIC, PCE 8-10 ARE FINER-GRAINED THAN ABOVE ROCKS
INTERGROWTHS OF PLAG AND CPX IN PCES(2-5), PCE 2 HAS
VERY FINE GRAINED MARGIN(NOT GLASS) CAN BE CALLED
COOLING MARGIN, PCES 6-7 HAVE POIKILITIC MAGNETITE
IN LARGE PLUG;
Structure : PLUG IN PCES 6-7, VEINS FILLED WITH CALCITE AND
SMECTITE AND SULFIDES;
Alteration : FRESH;
Comments : PCES 1A-1C PROBABLY BOTTOM OF UNIT FROM 23-1, PCES
2-5 ARE ANOTHER COOLING UNIT WITH POSSIBLY MORE OL
THAN UNIT ABOVE, PCES 6-7 ARE THIRD COOLING UNIT-
SIMILAR ROCK, PCES 8-10-FOURTH COOLING UNIT, GREY;
Phenocrysts: COMBINATION ( 7-10%)
PCES 2-5 HAVE 7-10% PHENOS WITH 2-3% OL PROBABLY
SAME FOR 1A-1C & 6-7 BUT PCE 8-10 HAVE 2-3% PHENOS
WITH PLAG AVERAGING <2MM;
Replacement: CALCITE
SMECTITE
SULFIDE
Leg : 65 Top/Bottom Interval(mm): 0/1450 Analyst: Morrison, M. Ann
Hole: 483 Sample Midpoint (m) : 192.95
Core: 24 Top of Core Depth (m) : 191.50
Sect: 1 Top of Section Depth(m): 191.50
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCES 1 (0-4), 2 (7-9), 3 (13-19), 4 (22-25),
5 (28-34), 6 (38-42), 7 (45-67), 8 (60-66),
9 (68-74), 10 (76-84), 11 (87-88), 12 (90-100),
13 (102-113), 14 (115-119), 15 (120-130),
16 (134-145);
Texture : PHYRIC, VARIABLE GRAIN SIZE, PCES(1,9,15,16) ARE MED
GRAINED, PCES(2-7,10-14) ARE FINER-GRAINED;
Structure : VEINS ARE THIN ALONG BROKEN SURFACES AND FILLED WITH
SMECTITE AND CALCITE AND SULFIDES;
Alteration : SLIGHTLY;
Comments : GREY, MAY NOT BE SINGLE COOLING UNIT AS TEXTURE VERY
VARIABLE ALTHOUGH NO CHILLED MARGINS OR GLASS;
Vesicles : Size(mm): Percent: .5
Location: Filling: SMECTITE
Shape : ROUND
VESICLES ARE SCARCE, PCE 10 HAS TWO VUGS 3 & 7MM
ACROSS WHICH ARE PARTIALLY FILLED WITH GREEN AND
BROWN SMECTITES;
Phenocrysts: PLAGIOCLASE ( 1-2%)
Size(mm): 1-2
PCES(1,9,15,16);
PLAGIOCLASE
Size(mm): 2-3
PCES 2-6 AND 10-14 CONTAIN ISOLATED PLAG PHENOS
AND 2% GLOMEROCRYSTS OF PLAG AND PYX;
OLIVINE
Size(mm): 1
SMALL OL-PSEUDOMORPHED BY CALCITE-SMECTITE IN PCE
1;
Replacement: SMECTITE
CALCITE
SULFIDE
Leg : 65 Top/Bottom Interval(mm): 0/1070 Analyst: Morrison, M. Ann
Hole: 483 Sample Midpoint (m) : 194.07
Core: 24 Top of Core Depth (m) : 191.50
Sect: 2 Top of Section Depth(m): 193.00
LITHOLOGY: PLAG-OL MOD PHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1A (1-15), 1B (14-29), 1C (25-39), 1D (40-55),
1E (55-64), 2 (65-72), 3 (74-81), 4 (82-98),
5 (100-107);
Texture : MOD PHYRIC, GRAIN-SIZE DECREASES THROUGH PCE 4 AND
PCE 5 IS DISTINCTLY FINER-GRAINED THAN REST OF
SECTION;
Structure : PCES 1A-C VEINED WITH SMECTITE AND CALCITE THE
LATTER FORMING AT VEIN INTERSECTION;
Alteration : MOD
Comments : LITHOLOGY CONTINUES FROM 24-1, MEDIUM GREY;
Vesicles :
Location: Filling: SMECTITE
SMALL VESICLES FILLED WITH GREEN SMECTITE
SOMETIMES RESEMBLING OL REPLACEMENT PRODUCT(?) IN
PCE 5, OTHERWISE VESICLES RARE;
Phenocrysts: PLAGIOCLASE ( 2.5%)
Size(mm): TO 2
OLIVINE ( TO 1%)
ALTERED TO GREEN SMECTITE(?), OCCUR IN
GLOMEROCRYSTIC CLOTS;
Replacement: SMECTITE
Minerals Replaced: OL
CALCITE
Leg : 65 Top/Bottom Interval(mm): 0/ 70 Analyst: Zolotarev, B.
Hole: 483 Sample Midpoint (m) : 196.07
Core: 25 Top of Core Depth (m) : 196.00
Sect: 1 Top of Section Depth(m): 196.00
LITHOLOGY: PLAG MOD PHYRIC BASALT;
Piece No. : PCE 1 (1-7);
Texture : MEDIUM-GRAINED, MOD PHYRIC;
Alteration : FRESH;
Comments : WHITE-GREY, BOTTOM OF BOUNDARY OF COOLING UNIT;
Vesicles : Size(mm): Percent: <1.1-
Location: .3 Filling: SMECTITE
Phenocrysts: PLAGIOCLASE ( 7-10%)
Size(mm): 2-3
Replacement: SMECTITE
MECTITE FILLS VESICLES AND IS BLUE-GREY;
Leg : 65 Top/Bottom Interval(mm): 100/1460 Analyst: Zolotarev, B.
Hole: 483 Sample Midpoint (m) : 197.46
Core: 25 Top of Core Depth (m) : 196.00
Sect: 1 Top of Section Depth(m): 196.10
LITHOLOGY: PLAG-CPX-OL SPARSELY PHYRIC BASALT;
Piece No. : PCES 2 (10-11), 3 (14-18), 4 (20-32), 5 (34-45),
6 (46-60), 7 (62-70), 8 (72-78), 9 (81-105),
10 (106-121), 11 (124-126), 12 (130-135),
13 (137-146);
Texture : VERY FINE-GRAINED TO FINE-GRAINED, SPARSELY PHYRIC;
Structure : FRACTURES PCES(4,7,10) FILLED WITH SMECTITE AND CARB
AND RARE PYRITE;
Alteration : SLIGHTLY;
Comments : TWO COOLING UNITS WITH BOUNDARY BETWEEN PCES 1-2,
DARK GREY;
Vesicles : Size(mm): Percent: <1-5
Location: Filling: SMECTITE
CONTENT VARIES FROM 5% TO <1%
Phenocrysts: PLAGIOCLASE ( <1-2%)
Size(mm): 1-3
CONTENT OF PLAG PHENOS VARIES FROM TRACE(2-3) TO
1% PCES(5-6) AND UP TO 2% PCES(12-13);
CLINOPYROXENE ( 1%)
Size(mm): 1-1.5
OLIVINE ( <1%)
Size(mm): 1-1.5
OL REPLACED BY SMECTITE AND SERPENTINE(?);
Replacement: SMECTITE
Minerals Replaced: OL
SERPENTINITE
Minerals Replaced: OL
ID SERPENTINE QUESTIONABLE;
Leg : 65 Top/Bottom Interval(mm): 0/ 760 Analyst: Zolotarev, B.
Hole: 483 Sample Midpoint (m) : 198.26
Core: 25 Top of Core Depth (m) : 196.00
Sect: 2 Top of Section Depth(m): 197.50
LITHOLOGY: PLAG-CPX-OL SPARSELY PHYRIC BASALT;
Piece No. : PCES 1 (1-8), 2 (11-20), 3 (22-30), 4 (32-36),
5 (39-49), 6 (52-67), 7 (52-59), 8 (62-65),
9 (67-76);
Texture : MEDIUM-GRAINED, SPARSELY PHYRIC;
Structure : FRACTURES FILLED WITH CARB AND SMEC AND PYRITE(VERY
RARE);
Alteration : SLIGHTLY;
Comments : SMAE UNIT AS 25-1, GREY;
Phenocrysts: PLAGIOCLASE ( 1-2%)
Size(mm): TO 4
SOMETIMES GLOMEROPHYRIC;
OLIVINE ( <1%)
Size(mm): 2-3
OL REPLACED BY SECONDARY MINERALS SMECTITE AND
SERPENTINE(?);
CLINOPYROXENE ( <1%)
Size(mm): 2-3
Replacement: SMECTITE
SERPENTINITE
PYRITE
CARBONATE
Leg : 65 Top/Bottom Interval(mm): 0/ 400 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 200.40
Core: 26 Top of Core Depth (m) : 200.00
Sect: 1 Top of Section Depth(m): 200.00
LITHOLOGY: PLAG-OL SPARSELY PHYRIC BASALT;
Piece No. : PCES 1 (1-6), 2A (7-21), 2B (21-35), 3 (36-40);
Texture : FINE TO MEDIUM-GRAINED, DECREASING GRAIN SIZE
TOWARDS BASE WITH O.5CM OF DEVITRIFIED GLASS
CRINKLED AT CONTACT TO SEDIMENTS WITH PATCHY SULFIDE
ON BASAL SURFACE;
Comments : LOWER PART OF COOLING UNIT THAT MAY CONTINUE FROM
25-2(SIMILAR GRAIN SIZE AND MINEROLOGY);
Phenocrysts: PLAGIOCLASE ( <1%)
Size(mm): <2
OLIVINE ( <1%)
Size(mm): <2
OL PHENOS RESORBED AND REPLACED BY SMECTITE(?) AND
CALCITE AND IN PLACES SULFIDE WITH SOME
CONCENTRATION IN LAYERS IN TOP OF 2B;
Leg : 65 Top/Bottom Interval(mm): 400/ 500 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 200.50
Core: 26 Top of Core Depth (m) : 200.00
Sect: 1 Top of Section Depth(m): 200.40
LITHOLOGY: SEDIMENT;
SILTSTONE;
Piece No. : PCE 4 (40-50);
Comments : BROWN INDURATED;
Leg : 65 Top/Bottom Interval(mm): 520/1040 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 201.04
Core: 26 Top of Core Depth (m) : 200.00
Sect: 1 Top of Section Depth(m): 200.52
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 5 (52-56), 6 (58-63), 7 (64-69), 8 (71-76),
9A (77-85), 9B (85-91), 9C (91-104);
Texture : FINE-GRAINED, SPARSELY PHYRIC;
Alteration : SLIGHTLY;
Vesicles : Size(mm): 1-3 Percent: <1.5
Phenocrysts: PLAGIOCLASE ( <1%)
Size(mm): <2
PLAG MICROPHENOS;
OLIVINE ( 0%)
OL ABSENT OR VERY RARE;
Leg : 65 Top/Bottom Interval(mm): 1050/1500 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 201.50
Core: 26 Top of Core Depth (m) : 200.00
Sect: 1 Top of Section Depth(m): 201.05
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCES 10A (105-114), 19B (114-118), 19C (120-126),
10D (127-143), 11 (145-150);
Texture : FINE-GRAINED, SPARSELY PHYRIC;
Structure : FRACTURES WITH SOME CHLORITE(?) AND MAYBE BLUE-
YELLOW ZEOLITE, CRACKS FILLED WITH LIGHT TO DARK
GREEN SMECTITE AND SULFIDE(PATCHY MARCASITE);
Alteration : SLIGHT
HALOS ALONG FRACTURES CHARACTERIZED ESPECIALLY BY
DIFFERENCES IN VESICLE FILLING, RED OXIDIZED HALO
ALONG FRACTURE IN PCE 2A;
Comments : PETROGRAPHICALLY SIMILAR TO OVERLYING COOLING UNIT,
SOME BLACK PLATY MAFIC(TABULAR);
Vesicles : SOME VESICLES PRESENT;
Phenocrysts: PLAGIOCLASE
OLIVINE
PSEUDOMORPHS;
Replacement: SULFIDES
GRANULAR, DARK BLACK MATERIAL UP TO 1CM AWAY FROM
CRACK CONSISTS OF SULFIDES AND ZEOLITES AND CARB;
ZEOLITE
ID ZEOLITE UNCERTAIN, LIGHT COLORED;
CARBONATE
MARCASITE
ID MARCASITE UNCERTAIN;
Leg : 65 Top/Bottom Interval(mm): 0/1500 Analyst: Schmincke, H.
Hole: 483 Sample Midpoint (m) : 203.00
Core: 26 Top of Core Depth (m) : 200.00
Sect: 2 Top of Section Depth(m): 201.50
LITHOLOGY: PLAG VERY SPARSELY PHYRIC BASALT;
Piece No. : PCES 1A (2-16), 1B (16-25), 2 (26-36), 3A (38-48),
3B (47-55), 4A (56-67), 4B (68-80), 4C (82-88),
4D (89-100), 4E (100-107), 4F (106-115),
5 (117-124), 6 (125-130), 7 (133-139), 8 (140-150);
Texture : VERY SPARSELY PHYRIC, OPHIMOTTLED, FINE TO MEDIUM-
GAINED WITH GRAIN SIZE INCREASING DOWNWARDS;
Structure : FRACTURES WITH NARROW HALOS AND SOME SLICKENSIDED
CHLORITE(??) LINING FRACTURES, SOME FRACTURE ZONES
APPEAR BLEACHED;
Alteration : NARROW HALOS AROUND FRACTURES;
Comments : CONTINUING CORE SECTION FROM 26-1;
Vesicles : Size(mm): <1-3 Percent: 1-5
Location: Filling: SMEC,ZEOL
Location: Filling: PHILLIPSITE
UPPER PART OF CORE VERY VESICULAR(CA 5% AT TOP)
DECREASING DOWNWARDS TO <1%, <1MM, SIZE DECREASES
FROM UP TO 3MM DOWN TO <1MM, MOST ABRUPT CHANGE IS
BETWEEN 4B AND 4C, ID UNCERTAIN FOR SMEC AND ZEOL
AND PHIL;
Phenocrysts: PLAGIOCLASE
Size(mm): 2-6
POSSIBLY SEVERAL GENERATIONS OF PLAG PHENOS: RARE
RELATIVELY LARGE(TO 6MM) CRYSTALS AND GLOMEROCRYST
WHILE MOST ARE MICROPHENOCRYSTS(<2MM);
CLINOPYROXENE
RARE BLACK CPX(?);
Replacement: SULFIDE
SMECTITE
CHLORITE
SOME SLICKEN SIDED CHLORITE(?);
ZEOLITE
BOTRYOIDAL OF SPHERULITIC ZEOLITE(?);
CARBONATE
Leg : 65 Top/Bottom Interval(mm): 0/1500 Analyst: Flower, M.
Hole: 483 Sample Midpoint (m) : 204.50
Core: 26 Top of Core Depth (m) : 200.00
Sect: 3 Top of Section Depth(m): 203.00
LITHOLOGY: PLAG-OL SPARSELY PHYRIC BASALT;
MASSIVE;
Piece No. : PCES 1 (0-12), 2 (15-23), 3 (25-34), 4 (35-45),
5 (47-60), 6 (62-70), 7 (72-79), 8A (81-91),
8B (90-98), 9A (99-113), 9B (110-113),
10A (115-123), 10B (124-134), 10C (134-143),
10D (143-148);
Texture : SPARSELY PHYRIC, PCE 2 ODD FRAGMENTS POSSIBLY FINE-
GRAINED OTHERWISE MEDIUM-GRAINED WITH PCES(3-10)
INCREASING SLIGHTLY, OPHIMOTLED GROUNDMASS TEXTURE;
Structure : HAIRLINE CRACKS ARE UNFILLED OR CONTAIN DARK GREEN
SMECTITE, ONE VEIN IN PCE 10C IS LINED WITH SMEC
WITH INNER FILLING OF WHITE CRYSTALLINE PHASE
(ZEOLITE?), PCES(1-3) CONTAIN VEINS OF CALCITE AND
SMECTITE, PCE 2 HAS ODD FRAGMENTS POSSIBLY FINE-
GRAINED, MASSIVE;
Comments : GREY;
Phenocrysts: PLAGIOCLASE ( <5%)
Size(mm): 1
OLIVINE
Size(mm): <.5
VERY SPARSE;
Replacement: SMECTITE
ZEOLITE
ID ZEOLITE UNCERTAIN;
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