Leg : 54 Top/Bottom Interval(mm): 0/1450 Analyst: Mattey, D.
Hole: 428A Sample Midpoint (m) : 63.95
Core: 1 Top of Core Depth (m) : 62.50
Sect: 1 Top of Section Depth(m): 62.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 4 (27-35), 5 (37-41), 6 (44-50), 7 (53-60),
8 (63-69), 9A (70-75), 9B (75-82), 10 (85-94),
11 (95-103), 12 (105-108), 13 (110-122);
Texture : APHYRIC,MEDIUM-GRAINED,GLASSY SEGREGATIONS IN PCES
9A+9B,VARIATION IN GRAINSIZE COARSENING TOWARD
MIDDLE OF UNIT PCES 9A+9B;
Structure : VERTICAL JOINTS COATED WITH BLUE CLAY.MINS;
Alteration : FRESH
ALL PCES EXCEPT PCE 4;
SLIGHTLY
PCE 4,WEATHERING RIND 1CM WIDE & GREENISH-GRAY
PARALLEL TO ONE CUT SURFACE IN PCE 4;
Comments : PALE GRAY BASALT;
Vesicles : Size(mm): Percent: RARE
Location: Filling: CLAY.MINS
RARE VESICLES FILLED WITH BLUE-GREEN CLAY.MINS,FEW
VESICLES PCES 4-8;
Size(mm): 1-2 Percent:
Location: Filling: CALCITE,ZEOL
Shape : TUBE-LIKE
LARGE VESICLES FILLED WITH CALCITE & ZEOL,
LARGE IRREGULAR VUGS SOME LINED WITH ZEOL;
Replacement: ZEOLITE
IN VESICLES;
CLAY MINERALS
BLUE & GREEN CLAY.MINS IN VESICLES & ON JOINT
SURFACES;
CALCITE
IN VESICLES;
Leg : 54 Top/Bottom Interval(mm): 0/1450 Analyst: Mattey, D.
Hole: 428A Sample Midpoint (m) : 63.95
Core: 1 Top of Core Depth (m) : 62.50
Sect: 1 Top of Section Depth(m): 62.50
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCES 1 (0-10), 2 (13-17), 3 (18-24), 14 (123-128),
15 (130-135), 16 (136-143);
Texture : SPARSELY PHYRIC,MEDIUM-GRAINED,FRAGMENTS OF GLASSY
BASALT COMPRISE PCE 1;
Structure : FRACTURE SURFACES PCES 2-3,VERTICAL CRACKS & JOINTS
THROUGHOUT,NEARLY SCORIACEOUS PCE 16,CLAY.MINS COAT
FRACTURES OF PCE 16;
Alteration : FRESH;
WEATHERING IS EVIDENT IN DRILL CUTTINGS OF PCE 1;
Comments : TOP 10CM COMPRISED OF DENSE GLASSY DRILL CUTTINGS,
PCES 1-3 ARE PART OF TOP COOLING UNIT CONTINUING
THROUGH PCE 12 OF APHYRIC CORE 1-1(0-145CM);
Vesicles :
Location: Filling: CLAY.MINS
BLUE-GREEN CLAY.MINS LINE VESICLES OF PCES 2-3;
Location: Filling: ZEOL,CHLOR
VESICLES LINED OR FILLED WITH ZEOL OR CHLOR,
NUMEROUS VUGS SOME LINED OR FILLED WITH WHITE ZEOL
OR BRIGHT GREEN UNIDENT.MIN(CHLOR?) PCE 15;
Size(mm): Percent: RARE
Location: Filling:
Shape : TUBULAR
PCE 1;
Phenocrysts: PLAGIOCLASE
PHENOS IN ALL PCES BUT GLOMEROCRYSTS FORMED IN
PCES 2-3;
CLINOPYROXENE
CPX GLOMEROCRYSTS IN PCES 2-3;
Replacement: ZEOLITE
WHITE ZEOL IN VESICLES & VUGS;
CHLORITE
ID UNCERTAIN,MAY BE PRESENT IN VESICLES & VUGS OF
PCE 15;
CLAY MINERALS
BLUE & GREEN CLAY.MINS ON FRACTURE SURFACES OF
PCES 2-3+16;
Leg : 54 Top/Bottom Interval(mm): 0/1320 Analyst: Schrader, E.L.
Hole: 428A Sample Midpoint (m) : 65.32
Core: 1 Top of Core Depth (m) : 62.50
Sect: 2 Top of Section Depth(m): 64.00
LITHOLOGY: PLAG PHYRIC BASALT;
Piece No. : PCES 1 (0-10), 2 (13-17), 3 (19-27), 4 (29-34),
5 (36-42), 6 (44-52), 7 (55-62), 8 (65-75),
9 (76-85), 10 (86-93), 11 (94-99), 12 (101-111),
13A (114-121), 13B (120-130);
Texture : PHYRIC TEXTURE IN ALL PCES EXCEPT PCES 1+6,PCES
1-2+6 ARE FINE-GRAINED,PCES 3-5+7 MEDIUM-GRAINED,
PCES 8-13B COARSE-GRAINED;
Structure : FRACTURES & JOINTS ON EXTERIOR SURFACES,MASSIVE
STRUCTURE FOR PCES 7-13B;
Alteration : FRESH
WEATHERING RINDS 5CM THICK OF FE.OXIDES ON PCES
1+5 & RINDS 1CM THICK ON PCES 2+6-8+10+12 ALSO THE
WEATHERED RINDS ARE CONTROLLED BY JOINTS &
FRACTURES,BLUE-GREEN CLAY.MIN COATING ON JOINT
SURFACE OF PCE 2,SMALL PATCH OF CLAY ON EXTERIOR
OF PCE 4,CLAY.MIN COATING ON PCE 12;
Comments : A COOLING UNIT IS DEFINED FROM PCES 1-6 ON A BASIS
OF GRAINSIZE VARIATIONS;
Vesicles : A VEW LARGE VUGS NEAR TOP & BOTTOM EDGES OF PCE 12
WHICH ARE 1-2MM IN SIZE;
Location: Filling: CLAY.MIN,ZEOL
LARGE VESICLES IN PCE 5 & ALSO A FEW VESICLES IN
PCE 10 POSSIBLY FILLED WITH THESE MINERALS;
A FEW SCATTERED EMPTY VESICLES IN PCE 1;
Groundmass : CLINOPYROXENE
OLIVINE
OL IS ALTERED;
Phenocrysts: PLAGIOCLASE
AS PHENOS BUT FORMING GLOMEROCRYSTS IN PCES 1+6;
Replacement: CLAY MINERALS
BLUE-GREEN CLAY.MIN COATING ON JOINT SURFACE OF
PCE 2 ALSO ON SURFACE OF PCES 4+12,MAY BE IN
VESICLES;
FERROUS OXIDE
WEATHERING RINDS WITH FE.OXIDES THROUGHOUT
SECTION;
ZEOLITE
ID UNCERTAIN,POSSIBLY IN VESICLES;
Leg : 54 Top/Bottom Interval(mm): 0/1450 Analyst: Humphris, S.
Hole: 428A Sample Midpoint (m) : 66.95
Core: 1 Top of Core Depth (m) : 62.50
Sect: 3 Top of Section Depth(m): 65.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE BASALT;
Piece No. : PCES 1A (0-7), 1B (7-14), 2A (15-25), 2B (24-35),
2C (35-41), 3A (43-60), 3B (60-76), 3C (75-95),
3D (94-100), 4 (104-112), 5A (114-120),
5B (120-130), 6A (132-136), 6B (136-144);
Texture : APHYRIC,COARSE-GRAINED,DIABASIC,PCES 1-4 FINER-
GRAINED THAN BELOW;
Structure : MASSIVE STRUCTURE,BROKEN VERTICAL JOINT PCE 2C,
VERTICAL JOINT & SECOND SET ALMOST PERPENDICULAR IN
PCE 3A;
Alteration : FRESH
Vesicles :
Location: Filling: CLAY.MIN,CALCITE
Shape : PINPOINT
SPARSE PINPOINT VESICLES INFILLED WITH WHITE
CARB.UNSPEC & BLUE CLAY.MINS;
Replacement: CALCITE
IN VESICLES & ON VERTICAL JOINT,ID UNCERTAIN;
CLAY MINERALS
IN VESICLES & ON EXTERIOR SURFACES ALSO IN JOINTS;
Leg : 54 Top/Bottom Interval(mm): 0/ 780 Analyst: Humphris, S.
Hole: 428A Sample Midpoint (m) : 67.78
Core: 1 Top of Core Depth (m) : 62.50
Sect: 4 Top of Section Depth(m): 67.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (1-11), 2 (13-18), 4 (26-33), 5 (35-40),
6 (41-45), 8 (57-64), 9 (65-77);
Texture : APHYRIC,FINE-TO-MEDIUM-GRAINED,CHILLED GLASSY MARGIN
IN PCE 6,SIMILAR TO CORE 1-2 SAMPLES 2+3 FOR PCE 4;
Structure : DOMINANT JOINTING IS HORIZONTAL & DOES NOT CONTROL
WEATHERING;
Alteration : FRESH
PCES 1-2+5-6+9;
SLIGHTLY
PCES 4+8,WEATHERING RIND 0.5CM WIDE ALONG THREE
MARGINS;
Comments : THIS SECTION IS DEFINITELY NOT CONTINUOUS WITH THE
PREVIOUS SECTION,DARK GRAY ON PCE 4;
Vesicles :
Location: Filling: CLAY.MIN
VESICLES FILLED WITH BLUE CLAY OR WHITE CLAY.MIN
FOR PCE 1 & VESICLES NEAR CHILLED MARGIN ARE
FILLED WITH BLUE CLAY.MIN FOR PCE 6 & PCE 2
IDENTICAL TO PCE 1,VESICLES COMMON & OFTEN EMPTY
PCES 4-5+8-9 ALSO VESICLES EMPTY TOWARDS CENTER OF
PCE 6;
Replacement: CLAY MINERALS
BLUE OR WHITE CLAY.MIN IN VESICLES OR ON OUTER
SURFACE OF PCE 6;
Leg : 54 Top/Bottom Interval(mm): 0/ 780 Analyst: Humphris, S.
Hole: 428A Sample Midpoint (m) : 67.78
Core: 1 Top of Core Depth (m) : 62.50
Sect: 4 Top of Section Depth(m): 67.00
LITHOLOGY: PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCES 3A (19-22), 3B (22-25), 7 (46-56);
Texture : SPARSELY PHYRIC,FINE-GRAINED;
Alteration : FRESH
Comments : SLIGHTLY DARKER COLOR IN PCES 3A+3B THAN ABOVE;
Vesicles :
Location: Filling: CLAY.MIN
VESICLES LINED WITH WHITE CLAY.MINS PCES 2A-3B,
EMPTY VESICLES IN PCES 3A-3B+7;
Replacement: CLAY MINERALS
WHITE CLAY.MINS IN VESICLES;
Leg : 54 Top/Bottom Interval(mm): 0/ 900 Analyst: Mattey, D.
Hole: 428A Sample Midpoint (m) : 72.90
Core: 2 Top of Core Depth (m) : 72.00
Sect: 1 Top of Section Depth(m): 72.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (2-5), 2 (7-13), 3 (15-22), 4 (25-33),
5 (36-44), 6 (46-53), 7 (55-61), 8 (64-75),
9 (78-81), 10 (84-90);
Texture : APHYRIC,MEDIUM-TO-COARSE-GRAINED,DIABASE,CHILLED
MARGIN IN PCE 9;
Structure : JOINT SURFACES WITH GREEN CLAY.MINS PCE 4;
Alteration : FRESH
ALL PCES EXCEPT PCE 2 & PART OF PCE 4;
SLIGHTLY
PCE 2 & PART OF PCE 4,WEATHERING RIND IS OXIDIZED
IN PCE 9,ALSO WEATHERED RIND IS PRESENT ON PCES
2+4 & IS 1CM WIDE ON PCE 2;
Vesicles :
Location: Filling:
Shape : PINPOINT
PINPOINT VESICLES IN PCES 2-4;
Replacement: CLAY MINERALS
GREEN CLAY.MINS ON SURFACES OF PCE 3;
Leg : 54 Top/Bottom Interval(mm): 0/1500 Analyst: Dmitriev, Y.
Hole: 428A Sample Midpoint (m) : 83.00
Core: 3 Top of Core Depth (m) : 81.50
Sect: 1 Top of Section Depth(m): 81.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-5), 2 (8-12), 3 (14-19), 4 (20-24),
5 (26-31), 6 (33-49), 7 (41-46), 8 (47-64),
9 (66-73), 10A (74-83), 10B (83-95), 10C (96-113),
11 (120-128), 12A (131-142), 12B (140-148);
Texture : APHYRIC,FINE-GRAINED TO APHANITIC,BLACK GLASSY
FRINGE ON PCE 4;
Structure : VERTICAL JOINTS,FISSURE MAKES 45 DEGREE ANGLE WITH
VERTICAL AXIS IN PCE 9,TWO SETS OF FISSURES ARE
VISIBLE IN PCES 10A-10C ONE IS THE VERTICAL JOINT &
THE OTHER IS THE 45 DEGREE FISSURE;
Alteration : FRESH
EVERYWHERE EXCEPT RINDS OF ALTERATION FOUND ON
PCES 9-11;
MOD
PCES 9-11,WEATHERING ZONE ABOUT 0.5CM THICK ON PCE
9,WEATHERING RIND ON PCES 10A-10C IS ABOUT 1CM
WIDE,ZONE OF WEATHERING IS PRESENT ON TOP-RIGHT
SIDE OF PCE 11;
Comments : BASALT HAS BROWNISH TINT IN AREAS OF WEATHERING DUE
TO PRESENCE OF FE.OXIDES(PCES 9-11);
Vesicles : PINPOINT VUGS ARE PRESENT IN PCE 1,EMPTY VUGS 1%
ARE UP TO 1MM IN SIZE IN PCE 2;
VERY SMALL EMPTY VESICLES IN PCE 5;
Size(mm): 0.1 Percent: 5-7
EMPTY VESICLES IN PCE 6;
Size(mm): Percent: 5-7
Location: Filling: CLAY.MINS
Shape : ROUND
ROUND VESICLES FILLED WITH LIGHT BLUISH CLAY.MINS
IN PCE 8;
Size(mm): 0.5-1 Percent: 5-10
Location: Filling: CLAY.MINS
VESICLES FILLED WITH BLUISH-WHITE CLAY.MINS
INCREASING FROM 5% IN PCE 10A TO 10% IN PCE 10C;
Size(mm): 0.1 Percent: 7
Location: Filling: CLAY.MINS
VESICLES FILLED WITH BLUISH-WHITE CLAY.MINS IN
PCES 11-12B;
Replacement: FERROUS OXIDE
PRESENT IN ZONES OF WEATHERING;
CLAY MINERALS
BLUISH-WHITE CLAY.MINS IN VESICLES;
Leg : 54 Top/Bottom Interval(mm): 0/1500 Analyst: Dmitriev, Y.
Hole: 428A Sample Midpoint (m) : 88.00
Core: 4 Top of Core Depth (m) : 86.50
Sect: 1 Top of Section Depth(m): 86.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-6), 2 (7-11), 3 (13-19), 4 (21-24),
5 (26-29), 6 (31-34), 7 (36-40), 8A (42-44),
8B (44-46), 9A (47-60), 9B (60-76), 10 (78-81),
11 (83-90), 12 (92-97), 13 (101-112), 14A (113-126),
14B (119-126), 15 (129-139), 16A (141-144),
16B (144-147);
Texture : APHYRIC,FINE-TO-MEDIUM-GRAINED,DARK GLASSY
SEGREGATIONS COMMON THROUGHOUT,APHANITIC TO GLASSY;
Structure : FISSURES ARE PERPENDICULAR TO & 45 DEGREES FROM THE
VERTICAL AXIS IN PCES 9A-11,VERTICAL FISSURES IN PCE
14,FISSURES OF PCE 15 ARE ORIENTED 45 DEGREES FROM
THE VERTICAL AXIS;
Alteration : FRESH
ALL PCES EXCEPT PCE 11;
MOD
PCE 11,WEATHERING ZONE 0.5CM BROWNISH IN COLOR
RUNNING ALONG FISSURES OF PCES 9A+9B,TWO BROWNISH
ZONES ABOUT 0.5CM ORIENTED AT 45 DEGREES TO THE
AXIS OF CORE PCE 11,BROWNISH & GREENISH SECONDARY
PRODUCTS ALONG VERTICAL FISSURES ON PCE 14;
Comments : SURFACE IS COATED WITH WHITISH & GREENISH SECONDARY
PRODUCTS PCE 15,PCE 1 SURROUNDED WITH LIGHTER ZONE
0.5CM,OUTER ZONE OF PCE 5 IS DARKER(0.5-0.8CM),TWO
ZONES OF DARK & GRAY PRESENT IN PCE 7,DARK GRAY
OUTER ZONE 0.5CM IN PCE 8A;
Vesicles : Size(mm): Percent: 3
Location: Filling:
Shape : PINPOINT
PINPOINT EMPTY VESICLES IN PCES 1+3+5+8A;
Size(mm): 0.1 Percent: 10
EMPTY VESICLES IN PCES 2+4+6;
Size(mm): Percent: 1-2
Location: Filling: CARB.UNSPEC,ZEOL
VESICLES FILLED WITH CARB.UNSPEC & ZEOL(?) IN PCES
9A+9B;
Size(mm): 0.1-0.2 Percent: 1-2
Location: Filling: UNIDENT.MINS
VESICLES FILLED WITH WHITE & GREENISH UNIDENT.MINS
IN PCE 13 & ALSO FOR PCE 14 BUT FILLED WITH LIGHT
GREENISH & GRAYISH UNIDENT.MINS;
Replacement: CALCITE
IN VESICLES;
ZEOLITE
ID UNCERTAIN-MAY BE PRESENT IN VESICLES;
UNIDENTIFIED
UNIDENT.MINS FILLING VESICLES MAY BE WHITISH &
GREENISH OR GREENISH & GRAYISH;
Leg : 54 Top/Bottom Interval(mm): 0/1450 Analyst: Fodor, R.
Hole: 428A Sample Midpoint (m) : 89.45
Core: 4 Top of Core Depth (m) : 86.50
Sect: 2 Top of Section Depth(m): 88.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (2-19), 2A (23-32), 2B (33-38), 3 (41-45),
4 (47-58), 5 (63-68), 6A (70-81), 6B (82-94),
7 (96-105), 8 (108-121), 9 (125-134), 10 (136-144);
Texture : APHYRIC,VERY FINE-GRAINED,APHANITIC;
Structure : VERTICALLY JOINTED,JOINTS CONTROL WEATHERING,A SMALL
CARB.UNSPEC VEINLET ON PCE 2;
Alteration : FRESH
PCES 6A+6B+9+10;
MOD
PCES 1-5+7-8,WEATHERING RIND RUST-COLORED 0.5CM
THICK IN PCES 1+3 & A 1CM THICK WEATHERING RIND
RUSTY ON PCES 2+8,SMALL WEATHERED PATCH ON PCE 6B
& THERE IS A 2CM THICK RIND ON PCE 7 & A RIND ON
PCE 4,FE.OXIDE STAINING WEATHERING RINDS WHICH ARE
PARALLEL TO VERTICAL JOINTS;
Vesicles :
Location: Filling: ZEOL
Shape : PINPOINT
PINPOINT VESICLES IN PCES 1-2 MAY BE FILLED WITH
ZEOL;
Location: Filling: CARB,CLAY,FE.OXID
VESICLES NEAR WEATHERING RIND FILLED WITH FE.OXIDE
& CARB.UNSPEC & GREEN CLAY.MINS IN PCES 4+5+6B;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
PLAG & CPX IN QUENCH PHASES OF GLASS;
Replacement: CLAY MINERALS
GREEN CLAY.MINS IN VESICLES;
CARBONATE
CARB.UNSPEC IN VESICLES;
ZEOLITE
ID UNCERTAIN-MAY BE PRESENT IN VESICLES;
FERROUS OXIDE
IN VESICLES & ON WEATHERING RINDS;
Leg : 54 Top/Bottom Interval(mm): 0/ 630 Analyst: Dmitriev, Y.
Hole: 428A Sample Midpoint (m) : 90.13
Core: 4 Top of Core Depth (m) : 86.50
Sect: 3 Top of Section Depth(m): 89.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-11), 2 (12-22), 3 (24-34), 4 (35-47),
5 (49-63);
Texture : APHYRIC,MEDIUM-GRAINED;
Structure : HORIZONTAL JOINTS DOMINATE & CONTROL WEATHERING;
Alteration : FRESH
FE-STAINED WEATHERING RIND ON PCE 1 & ORIENTATION
OF ZONE IS AT 45 DEGREES;
Vesicles : VUGS 1-1.5MM FILLED WITH QTZ & ZEOL(?) &
CARB.UNSPEC IN PCE 3;
Location: Filling: CLAY.MINS
SPARSE VESICLES FILLED WITH GREEN CLAY.MINS;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
PLAG & CPX IN QUENCH PHASES OF GLASS;
Replacement: CLAY MINERALS
GREEN CLAY.MINS IN VESICLES;
CARBONATE
CARB.UNSPEC FILLING VUGS IN PCE 3;
ZEOLITE
FILLING VUGS OF PCE 3(ID UNCERTAIN);
QUARTZ
FILLING VUGS OF PCE 3;
Leg : 54 Top/Bottom Interval(mm): 0/1500 Analyst: Humphris, S.
Hole: 428A Sample Midpoint (m) : 92.50
Core: 5 Top of Core Depth (m) : 91.00
Sect: 1 Top of Section Depth(m): 91.00
LITHOLOGY: APHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCES 1 (0-4), 2 (5-11), 5 (73-77);
Texture : APHYRIC,PCES 1+2 FINE-GRAINED,PCE 5 COARSER-GRAINED,
CHILLED MARGIN TOP OF PCE 1;
Structure : PILLOW BASALT,VERTICAL & HORIZONTAL JOINTS THAT
CONTROL WEATHERING;
Alteration : MOD
PCES 1-2+5 MAY HAVE SMALL FRESHER INTERIOR,SMALL
WEATHERING RIM <0.5CM NOT FAR ADVANCED BUT
WEATHERING RIND IS FARTHER ADVANCED IN PCE 2 & PCE
5 APPEARS TO BE A BROKEN WEATHERING RIM,OXIDIZED
RIM ON PCE 5;
Vesicles :
Location: Filling: FE.OXIDE
IN VESICLES NEAR WEATHERED RIM IN PCE 2;
Replacement: FERROUS OXIDE
IN VESICLES NEAR WEATHERED RIM IN PCE 2;
Leg : 54 Top/Bottom Interval(mm): 0/1500 Analyst: Humphris, S.
Hole: 428A Sample Midpoint (m) : 92.50
Core: 5 Top of Core Depth (m) : 91.00
Sect: 1 Top of Section Depth(m): 91.00
LITHOLOGY: PLAG PHYRIC BASALT;
Piece No. : PCES 3A (12-25), 3B (25-35), 3C (35-45), 3D (45-60),
4 (61-71), 6 (79-85), 7 (86-99), 8 (101-109),
9 (110-120), 10A (121-123), 10B (123-125);
Texture : PHYRIC,MEDIUM-TO-COARSE-GRAINED;
Structure : VERTICAL & HORIZONTAL JOINTS CONTROL WEATHERING
RIND,VEIN FILLED WITH BROWN FE.OXIDE PCE 3A,VEIN
LINED WITH BROWN FE.OXIDE & FILLED WITH BLACK
AMORPHOUS MATERIAL PCE 9;
Alteration : FRESH
PCES 3C+3D+8+11A-12;
MOD
PCES 3A+3B+4+6+7+9-10B+12+13,A 2CM WIDE BROWN
OXIDATION RIM ON PCES 3A+3B BUT RIM IS SMALLER ON
PCE 3B & A 1CM WEATHERED RIM ON PCES 4+6+9+13,RIND
IS OXIDIZED ON PCE 9,THERE IS A SMALL WEATHERING
RIM ON PCES 7+8+12+10A,MOST OF PCE 10B IS A
WEATHERING RIM;
Vesicles :
Location: Filling: ZEOL
FILLS VESICLES IN PCES 7-8;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
CPX & PLAG PRESENT IN QUENCH PHASES OF GLASS;
Phenocrysts: PLAGIOCLASE ( TO 5%)
Replacement: FERROUS OXIDE
IN VEINS;
ZEOLITE
FILLING VESICLES & SMALL PATCH ON PCES 7+8;
UNIDENTIFIED
BLACK AMORPHOUS UNIDENT.MINS FILLS VEIN IN PCE 9;
Leg : 54 Top/Bottom Interval(mm): 0/ 340 Analyst: Schrader, E.L.
Hole: 428A Sample Midpoint (m) : 92.84
Core: 5 Top of Core Depth (m) : 91.00
Sect: 2 Top of Section Depth(m): 92.50
LITHOLOGY: PLAG PHYRIC BASALT;
Piece No. : PCES 1A (0-27), 1B (25-33);
Texture : PHYRIC,COARSE-GRAINED;
Structure : FRACTURE SURFACES INCLINED 45-60 DEGREES FROM
HORIZONTAL COATED WITH BLUE CLAY.MINS;
Alteration : FRESH
PCE 1A EXCEPT ON VERY TOP;
MOD
PCE 1B,OXIDIZED RIND AT BOTTOM OF PCE 1A,COATING
ON PCE 1B THAT IS OXIDIZED;
Vesicles :
Location: Filling: CLAY.MINS
BLUE CLAY.MINS FILL SCATTERED VESICLES;
Groundmass : CLINOPYROXENE
RATHER LARGE IN GNDMASS;
Phenocrysts: PLAGIOCLASE
FORMS GLOMEROCRYSTS;
Replacement: CLAY MINERALS
BLUE CLAY.MINS IN VESICLES & ON FRACTURE SURFACE
OF PCE 1B & IS 1CM THICK;
Leg : 54 Top/Bottom Interval(mm): 340/1500 Analyst: Schrader, E.L.
Hole: 428A Sample Midpoint (m) : 94.00
Core: 5 Top of Core Depth (m) : 91.00
Sect: 2 Top of Section Depth(m): 92.84
LITHOLOGY: APHYRIC BASALT;
MASSIVE BASALT;
Piece No. : PCES 2 (36-41), 3 (44-46), 4 (49-53), 5A (55-68),
5B (68-70), 5C (68-81), 5D (81-89), 5E (89-105),
6A (108-121), 6B (120-127), 7A (130-134),
7B (130-134), 7C (130-134), 8 (136-140),
9 (134-147);
Texture : APHYRIC,MEDIUM-GRAINED;
Structure : FE.OXIDE VEINS CUT ENTIRE PCE 2,ANGULAR FRACTURES
INCLINED AT 45-60 DEGREES FROM THE HORIZONTAL,
MASSIVE BASALT;
Alteration : FRESH
PCES 3-5E+8-9;
MOD
PCES 2+6A-7C,WEATHERING RINDS WITH FE STAINS ON
PCES 6A-7C,THERE ARE TWO PRONOUNCED ZONES OF
ALTERATION ON PCES 6A-6B;
Comments : PEBBLES OF APHYRIC BASALT COMPRISE PCES 7A-7C;
Groundmass : CLINOPYROXENE
CPX IS RATHER LARGE IN THE GNDMASS;
Phenocrysts: PLAGIOCLASE
A FEW GLOMEROCRYSTS OF PLAG IN PCES 6A+6B;
Replacement: FERROUS OXIDE
IN VEINS IN PCE 2;
CLAY MINERALS
BLUE CLAY.MINS ON TOP SURFACES OF PCES 5A+9;
Leg : 54 Top/Bottom Interval(mm): 0/1500 Analyst: Mattey, D.
Hole: 428A Sample Midpoint (m) : 95.50
Core: 5 Top of Core Depth (m) : 91.00
Sect: 3 Top of Section Depth(m): 94.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE BASALT;
Piece No. : PCES 1 (0-12), 2 (13-27), 3 (28-40), 4 (43-49),
5 (51-56), 6 (59-61), 7 (64-70), 8 (73-80),
9 (81-90), 10 (92-106), 11 (107-116), 12 (118-129),
13 (130-139), 14 (142-150);
Texture : APHYRIC,COARSE-GRAINED EXPECIALLY FROM 30-40CM,
INTERSERTAL TO SUBOPHITIC,DARK GLASSY SEGREGATIONS
IN PCES 1+2;
Structure : MASSIVE BASALT,THIN VEIN OF GREEN CLAY.MINS RUNS
THROUGH PCE 1;
Alteration : FRESH
PCES 1-3+9+11+12+14;
MOD
PCES 4-8+10+13,WEATHERING RINDS WITH FE.OXIDES
PROMINENT-RIND IS 3CM WIDE ON PCES 4-9+11+12+14 &
USUALLY IS YELLOWISH-GRAY,THERE IS A YELLOWISH 2CM
RIND ON PCE 10 & ALSO A 1CM WIDE RIND ON PCE 13;
Vesicles : IRREGULAR VUGS 2-3MM NEAR BASE OF SAMPLE FILLED
WITH GREEN CLAY.MINS PCE 2;
Groundmass : PLAGIOCLASE
PLAG LATHS PRESENT;
CLINOPYROXENE
OPHITIC CPX PRESENT WITH DARKER GLASSY
SEGREGATIONS;
Phenocrysts: PLAGIOCLASE
GLOMEROCRYSTS PRESENT PCE 3;
Replacement: CLAY MINERALS
GREEN CLAY.MINS VEINS & IN VUGS;
FERROUS OXIDE
PRESENT ON WEATHERING RINDS;
Leg : 54 Top/Bottom Interval(mm): 0/ 950 Analyst: Natland, J.
Hole: 428A Sample Midpoint (m) : 96.45
Core: 5 Top of Core Depth (m) : 91.00
Sect: 4 Top of Section Depth(m): 95.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE BASALT;
Piece No. : PCES 1 (1-15), 2 (17-24), 3A (26-33), 3B (33-40),
4 (43-55), 5 (58-80), 6 (84-95);
Texture : APHYRIC,COARSE-GRAINED,FELTY TEXTURE,GRAINSIZE
FAIRLY UNIFORM THROUGHOUT SIMILAR TO LOWER PART OF
SECTION 3;
Structure : MASSIVE BASALT,JOINT OR FRACTURE SURFACE HAS BLUISH
CLAY.MINS & CARB.UNSPEC(?) COATING ON PCES 3A+3B;
Alteration : SLIGHTLY
ALL PCES EXCEPT 5+6 WHICH HAVE INTENSELY ALTERED
UPPER EDGES WHICH HAVE SHARP TRANSITIONS TO
FRESHER ROCK;
EXT
TOPS OF PCES 5+6,WEATHERING RINDS WITH FE.OXIDE
PRESENT ON PCES 5+6 GIVING ROCK A RUSTY COLOR;
Vesicles :
Location: Filling:
Shape : PINHOLE
PINHOLE VESICLES THROUGHOUT BUT MORE VISIBLE IN
PCES 5+6 OTHER VESICLES MAY BE INFILLED & THUS
LESS VISIBLE IN OTHER PCES;
Groundmass : PLAGIOCLASE
RADIAL PLAG XTLS VISIBLE ON ALL PCES GIVING ROCK
A FELTY TEXTURE;
CLINOPYROXENE
VISIBLE WITH HAND LENS;
Replacement: CALCITE
ID UNCERTAIN,MAY BE PRESENT ON FRACTURE OF PCE 3;
CLAY MINERALS
BLUISH CLAY.MINS ON FRACTURE OF PCE 3;
FERROUS OXIDE
PRESENT ON WEATHERING RINDS;
Leg : 54 Top/Bottom Interval(mm): 0/1500 Analyst: Mattey, D.
Hole: 428A Sample Midpoint (m) : 102.00
Core: 6 Top of Core Depth (m) : 100.50
Sect: 1 Top of Section Depth(m): 100.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE BASALT;
Piece No. : PCES 1 (2-7), 2 (9-13), 3 (15-20), 4 (23-28),
5 (31-33), 6 (36-41), 7 (43-45), 8 (47-55),
9 (58-63), 10 (66-72), 11 (74-80), 12 (83-91),
13 (94-106), 14 (108-117), 15 (120-126),
16 (129-138), 17 (142-149);
Texture : APHYRIC,FINE-TO-COARSE-GRAINED,ONE GLASSY
SEGREGATION PRESENT IN PCE 17;
Structure : MASSIVE BASALT;
Alteration : FRESH
PCES 2-5+8+9+12+13+15-17;
MOD
PCES 1+6+7+10+11+14 ALL HAVE ALTERATION ON THE
OUTER SURFACE BUT ARE FRESH IN THE CORE,WEATHERING
RINDS STAINED WITH FE.OXIDES RANGING IN SIZE FROM
0.5-2CM THICK ON PCES 1+2+6+7+10+11+14;
Vesicles : VESICLES SCATTERED THROUGHOUT,LARGE IRREGULAR VUGS
UP TO 2CM IN SIZE & ARE LINED WITH YELLOW
UNIDENT.MINS ON PCE 3,FEW VUGS FILLED WITH BLUE
TRANSLUCENT UNIDENT.MINS ON PCES 4+6,SMALL VUGS
LINED WITH YELLOW UNIDENT.MINS IN PCES 5+7,EMPTY
VUGS AROUND EDGES OF PCES 8-10,VUGS LINED WITH
BLUE CLAY.MINS OR FILLED WITH ZEOL(?) IN PCE 13,
VUGS NOT FILLED IN PCES 14-17;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
IN QUENCH PHASES;
Replacement: CLAY
BLUE CLAY.MINS IN VUGS;
ZEOLITE
ID UNCERTAIN BUT MAY BE PRESENT IN VUGS;
FERROUS OXIDE
PRESENT ON WEATHERING RINDS;
Leg : 54 Top/Bottom Interval(mm): 0/1450 Analyst: Mattey, D.
Hole: 428A Sample Midpoint (m) : 111.45
Core: 7 Top of Core Depth (m) : 110.00
Sect: 1 Top of Section Depth(m): 110.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1 (0-8), 2 (10-19), 3 (23-30), 4 (33-43),
5 (46-50), 6A (53-58), 6B (58-67), 6C (67-73),
6D (73-85), 6E (85-100), 7A (103-114), 7B (114-124),
7C (124-135), 7D (135-145);
Texture : APHYRIC,MEDIUM-GRAINED,SUBOPHITIC;
Structure : VERTICAL JOINTS CONTROLLING WEATHERING RINDS;
Alteration : FRESH
PCES 4+6B-7D;
MOD
PCES 1-3+5+6A HAVE ALTERED OUTER RIMS BUT FRESH
INSIDE,WEATHERING RINDS WITH FE STAIN PROMINENT IN
PCES 1-6A;
Leg : 54 Top/Bottom Interval(mm): 0/1500 Analyst: Schrader, E.L.
Hole: 428A Sample Midpoint (m) : 113.00
Core: 7 Top of Core Depth (m) : 110.00
Sect: 2 Top of Section Depth(m): 111.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCES 1A (0-10), 1B (10-19), 1C (18-21), 1D (22-34),
1E (34-46), 1F (46-49), 2 (52-56), 3 (60-62),
4 (65-67), 5 (70-78), 6 (79-88), 7 (90-97),
8 (99-105), 9 (107-110), 10 (113-116),
11A (120-131), 11B (131-136), 12 (139-149);
Texture : APHYRIC,MEDIUM-GRAINED,SUBOPHITIC-HOLOXTLN TEXTURE;
Structure : MASSIVE BASALT,IRREGULAR JOINTS IN PCES 3-8 WHICH
HAVE INDISTINCT WEATHERING RINDS THAT ARE PARALLEL
TO THE JOINTS,SLIGHT FELTY MEGASCOPIC TEXTURE;
Alteration : FRESH
PCES 1A-2+5+9-12;
MOD
PCES 3+4+6-8 HAVE OUTER RIM ALTERED BUT INSIDE IT
IS FRESH,WEATHERING RINDS WITH LIGHT COATING OF
FE.OXIDES ARE PRESENT ON PCES 3+4+6-8 WHICH ARE
ABOUT 2CM THICK;
Vesicles : VESICLES ARE FEW & EMPTY;
Replacement: FERROUS OXIDE
ON WEATHERING RINDS;
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