Leg : 61 Top/Bottom Interval(mm): 0/ 720 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 565.22
Core: 14 Top of Core Depth (m) : 563.00
Sect: 2 Top of Section Depth(m): 564.50
LITHOLOGY: MICRODOLERITE;
BASALT SILL;
Piece No. : PCE 1 (0-14), 2 (16-20), 3A (25-40), 3B (40-60),
3C (60-69);
Structure : BASALT SILL, CUT BY NUMEROUS VEINS OF CALCITE
(THICKEST)+CHLORITE+CLAY-CHLORITE-CALCITE;
Texture : FINE-GRAINED MICRODOLERITE, INTERVAL (2-7) MORE
FINE-GRAINED;
Alteration : SLIGHTLY TO MOD;
Groundmass : PLAGIOCLASE ( 60%)
MICROPHENOS AND MICROLITES;
CLINOPYROXENE ( 20%)
MICROPHENOS AND INTERSTITIAL;
MAGNETITE ( 8-10%)
SMALL IRREGULAR GRAINS;
PYROXENE
SLIGHTLY ALTERED TO LIGHT GREEN SMEC;
Replacement: CALCITE
CHLORITE
CLAY MINERALS
SMECTITE
Minerals Replaced: PYX
Leg : 61 Top/Bottom Interval(mm): 0/ 110 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 566.61
Core: 15 Top of Core Depth (m) : 566.50
Sect: 1 Top of Section Depth(m): 566.50
LITHOLOGY: SEDIMENT;
Leg : 61 Top/Bottom Interval(mm): 110/1490 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 567.99
Core: 15 Top of Core Depth (m) : 566.50
Sect: 1 Top of Section Depth(m): 566.61
LITHOLOGY: BASALT SILL;
Piece No. : PCE 1A (13-30), 1B (30-37), 2A (40-55), 2B (55-66),
2C (66-76), 2D (76-86), 2E (86-97), 2F (97-114),
2G (115-122), 2H (123-149);
Structure : BASALT SILL, MANY VEINS FROM 11-60CM OF CALCITE,
CHLORITE, AND COMPLEX VEINS OF CALCITE, CHLORITE,
ETC., BELOW 60CM THE VEINS ARE LESS ABUNDANT;
Texture : APHYRIC, AT 36CM ARE CHLORITE AND CLAY HALOS,
BELOW 60CM THE BASALT IS APHANITIC;
Alteration : MOD;
Replacement: CHLORITE
CALCITE
Leg : 61 Top/Bottom Interval(mm): 0/ 240 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 568.24
Core: 15 Top of Core Depth (m) : 566.50
Sect: 2 Top of Section Depth(m): 568.00
LITHOLOGY: BASALT SILL;
Leg : 61 Top/Bottom Interval(mm): 0/ 240 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 568.24
Core: 15 Top of Core Depth (m) : 566.50
Sect: 2 Top of Section Depth(m): 568.00
LITHOLOGY: MICRODOLERITE;
Piece No. : PCE 1 (1-7), 2 (11-21);
Structure : VEINS OF CALCITE WITH PYRITE;
Texture : DIABASIC, SLIGHTLY MORE COARSE-GRAINED FROM 4-5CM;
Alteration : MOD;
Replacement: CALCITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1420 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 573.42
Core: 16 Top of Core Depth (m) : 572.00
Sect: 1 Top of Section Depth(m): 572.00
LITHOLOGY: MICRODOLERITE;
BASALT SILL;
MICRODOLERITES SAME AS ABOVE (15-2);
Piece No. : PCE 1A (0-45), 1B (42-55), 1C (55-70), 1D (70-80),
1E (80-84), 1F (85-95), 1G (95-120), 1H (120-140);
Structure : BASALT SILL, QUARTZ-CHLORITE-CLAY-CALCITE AND
QUARTZ-DIORITE LIKE VEINS APPEAR, QUARTZ-DIORITE
LIKE VEINS CONSIST OF QUARTZ AND PLAG, PARTLY
ALTERED TO CALCITE AND BRIGHT GREEN SMEC;
Texture : MICRODOLERITES;
Alteration : MOD
ALTERATION IS OBSERVED NEAR VEINS;
Replacement: CALCITE
Minerals Replaced: QUARTZ
PLAGIOCLASE
Minerals Replaced: SMEC
BRIGHT GREEN SMEC;
PYROXENE
Minerals Replaced: SMEC
GREEN SMEC;
Leg : 61 Top/Bottom Interval(mm): 0/ 450 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 573.95
Core: 16 Top of Core Depth (m) : 572.00
Sect: 2 Top of Section Depth(m): 573.50
LITHOLOGY: MICRODOLERITE;
MICRODOLERITES SAME AS ABOVE (16-1);
Piece No. : PCE 1A (0-8), 1B (5-35), 1C (35-41);
Structure : BASALT SILL;
Texture : APHYRIC, MICRODOLERITE;
Leg : 61 Top/Bottom Interval(mm): 0/1350 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 575.35
Core: 17 Top of Core Depth (m) : 574.00
Sect: 1 Top of Section Depth(m): 574.00
LITHOLOGY: MASSIVE SUBOPHITIC DOLERITE;
BASALT SILL;
Piece No. : PCE 1A (0-13), 1B (14-57), 1C (57-79), 1D (77-95),
1E (95-104), 1F (105-115), 1G (111-122),
1H (122-135);
Structure : MASSIVE, BASALT SILL, SOME VEINS ARE OF CALCITE+
CHLORITE+CLAY (SMECTITE OR PARAGONITE),
Texture : SULFIDE (PYRITE) OCCURS IN SOME VEINS;
SUBOPHITIC, SPARSELY SPOTTED WITH CPX AGGREGATES AND
PLAG PHENOS, MICROPHENOS ARE PLAG AND CPX;
Alteration : SLIGHTLY TO MOD;
Comments : CHLORITE VEINS ARE MEDIUM BLUISH GRAY (5B 5/1),
CLAY VEINS ARE DARK GREEN AND LIGHT OLIVE BROWN
(5Y 5/6);
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
MICROPHENOS;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
TITANOMAGNETITE
MICROLITES, IN ABUNDANCE PLAG>CPX>TI-MAGN;
Replacement: CALCITE
CHLORITE
CLAY MINERALS
PYRITE
Groundmass : CLINOPYROXENE
AGGREGATES;
TITANOMAGNETITE
Leg : 61 Top/Bottom Interval(mm): 0/1070 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 576.57
Core: 17 Top of Core Depth (m) : 574.00
Sect: 2 Top of Section Depth(m): 575.50
LITHOLOGY: MASSIVE DOLERITE;
BASALT SILL;
AS MENTIONED IN SECTION 17-1;
Piece No. : PCE 1 (0-22), 2A (25-35), 2B (35-44), 3A (45-61),
Texture : SUBOPHITIC;
Structure : MASSIVE, BASALT SILL, IT IS NOT CLEAR WHETHER THE
SILL LAYER OF THIS SECTION IS DIFFERENT FROM THAT OF
LAST SECTION, VEINS PRESENT;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
MICROPHENOS;
Replacement: CALCITE
CHLORITE
CLAY MINERALS
PYRITE
Groundmass : CLINOPYROXENE
AGGREGATES;
TITANOMAGNETITE
Replacement: CLAY MINERALS
SMECTITE
Minerals Replaced: PYX
Leg : 61 Top/Bottom Interval(mm): 0/ 50 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 576.05
Core: 18 Top of Core Depth (m) : 576.00
Sect: 1 Top of Section Depth(m): 576.00
LITHOLOGY: MASSIVE DOLERITE;
BASALT SILL;
Piece No. : PCE 1 (0-4);
Structure : MASSIVE BASALT SILL, VEINED;
Texture : APHYRIC WITH MICROPHENOS OF CPX AND PLAG,
SUBOPHITIC DOLERITE;
Alteration : SLIGHTLY;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS;
Leg : 61 Top/Bottom Interval(mm): 50/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 577.50
Core: 18 Top of Core Depth (m) : 576.00
Sect: 1 Top of Section Depth(m): 576.05
LITHOLOGY: MASSIVE DOLERITE;
BASALT SILL;
Piece No. : PCE 2A (5-22), 2B (23-31), 2C (32-46), 2D (46-54),
4 (54-70), 4 (74-80), 5A (84-96), 5B (96-114),
5C (114-150);
Structure : MASSIVE BASALT SILL, SOME VEINS OF CALCITE+CLAY+
CHLORITE, IN SOME VEINS SULFIDE (PYRITE?) OCCURS;
Texture : SPARSE SPOTS (MORE FREQUENT THAN CORE 17) OF
CPX AGGREGATES AND PHENOS (<2MM), THIS DOLERITE IS
MADE OF PHENOS OF CPX AND MICROPHENOS OF CPX+PLAG;
OF CPX AND MICROPHENOS OF CPX AND PLAG;
Alteration : SLIGHTLY TO MOD
ALTERATION SAME AS IN SECTION 17-1;
Comments : COLOR IS SAME AS IN SECTION 17-1;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
Groundmass : CLINOPYROXENE
MICROLITES;
PLAGIOCLASE
MICROLITES;
TITANOMAGNETITE
MICROLITES;
CPX=PLAG>TI-MAGN IN ABUNDANCE;
Replacement: PYRITE
ID UNCERTAIN, IN VEINS;
CALCITE
CHLORITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/ 900 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 578.40
Core: 18 Top of Core Depth (m) : 576.00
Sect: 2 Top of Section Depth(m): 577.50
LITHOLOGY: MASSIVE DOLERITE;
BASALT SILL, SAME AS SECTION 18-1;
Piece No. : PCE 1 (0-9), 2A (10-32), 2B (32-70), 2C (70-88);
Structure : MASSIVE BASALT SILL, VEINS PRESENT;
Texture : APHANITIC, PHYRIC AS IN SECTION 18-2;
Alteration : SLIGHTLY TO MOD;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
Groundmass : CLINOPYROXENE
MICROLITES;
PLAGIOCLASE
MICROLITES;
TITANOMAGNETITE
MICROLITES;
CPX=PLAG>TI-MAGN IN ABUNDANCE;
Replacement: PYRITE
ID UNCERTAIN, IN VEINS;
CALCITE
CHLORITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1430 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 579.43
Core: 19 Top of Core Depth (m) : 578.00
Sect: 1 Top of Section Depth(m): 578.00
LITHOLOGY: BASALT SILL (MASSIVE);
Piece No. : PCE 1 (1-72), 2 (72-141);
Structure : MASSIVE BASALT (SILL), FROM 45 TO 65CM IS A VEIN
WITH DARK GREEN EDGES AND A LIGHT GREEN (10G 8/2)
INTERIOR (CELAD?,ZEOLITE?), FROM 75 TO 85CM THERE
ARE CHLORITE+PALE GREEN MATERIAL+PYRITE VEINS,
FROM 85 TO 92CM THERE ARE CHLORITE+PALE GREEN
MINERAL VEINS, AND FROM 118 TO 150CM THE VEINS
ALSO HAVE PYRITE BLOTCHES;
Replacement: PYRITE
CHLORITE
CELADONITE
ID UNCERTAIN;
ZEOLITE
ID UNCERTAIN;
Leg : 61 Top/Bottom Interval(mm): 0/1310 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 580.81
Core: 19 Top of Core Depth (m) : 578.00
Sect: 2 Top of Section Depth(m): 579.50
LITHOLOGY: BASALT SILL;
Piece No. : PCE 1 (0-50), 2 (43-128);
Structure : MASSIVE BASALT (SILL), VEINS ARE OF CHLORITE+PALE
GREEN MATERIAL+PYRITE, FROM 0 TO 50CM VEINS
OCCUR (THROUGHOUT) APPROXIMATELY EVERY 2CM;
Texture : INTERVAL (77-105) IS FINE-GRAINED;
Alteration : ALTERED;
Replacement: PYRITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 582.49
Core: 20 Top of Core Depth (m) : 581.00
Sect: 1 Top of Section Depth(m): 581.00
LITHOLOGY: MASSIVE BASALT SILL;
Piece No. : PCE 1A (0-5), 1B (5-15), 2A (20-34), 2B (34-50),
2C (50-60), 2D (60-68), 2E (68-78), 2F (78-85),
2G (85-96), 3 (100-113), 4A (115-130), 4B (130-140),
4C (140-149);
Structure : MASSIVE BASALT SILL, VEINS OF CHLORITE+PYRITE OCCUR
WHICH ARE 0.5-2MM THICK;
Texture : FINE-GRAINED, FROM 55CM AND DOWNWARD, THE
ROCK APPEARS TO SUBTLY BECOME FINER IN GRAIN-SIZE
AND MORE LEUCOCRATIC;
Alteration : MOD;
Replacement: CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1420 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 583.92
Core: 20 Top of Core Depth (m) : 581.00
Sect: 2 Top of Section Depth(m): 582.50
LITHOLOGY: MASSIVE BASALT SILL;
Piece No. : PCE 1A (0-11), 1B (11-22), 1C (24-26), 2 (30-49),
3A (42-48), 3B (49-60), 3C (61-65), 3D (65-80),
3E (80-90), 3F (90-97), 3G (98-110), 3H (110-117),
3I (118-128), 4 (130-141);
Structure : MASSIVE BASALT SILL, FROM 100 TO 120CM ARE 1 TO 2MM
THICK VEINS OF CHLORITE+PYRITE;
Texture : FINE-GRAINED;
Alteration : MOD;
Replacement: CHLORITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 140 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 586.14
Core: 21 Top of Core Depth (m) : 586.00
Sect: 1 Top of Section Depth(m): 586.00
LITHOLOGY: SEDIMENT;
Leg : 61 Top/Bottom Interval(mm): 140/ 960 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 586.96
Core: 21 Top of Core Depth (m) : 586.00
Sect: 1 Top of Section Depth(m): 586.14
LITHOLOGY: BASALT SILL;
Piece No. : PCE NO PCE NUMBERS ASSIGNED;
Structure : THREE BASALT SILLS, DARK VEINS PRESENT;
Texture : GRAIN SIZE INCREASES FROM 42 TO 93CM WHERE
A GLASSY CHILL MARGIN EXISTS FROM 93 TO 96CM;
Comments : UNIT 1 OF 4 UNITS;
Leg : 61 Top/Bottom Interval(mm): 960/1230 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 587.23
Core: 21 Top of Core Depth (m) : 586.00
Sect: 1 Top of Section Depth(m): 586.96
LITHOLOGY: BASALT SILL;
Piece No. : PCE NO PCE NUMBERS ASSIGNED;
Structure : BASALT SILL, VEINED BASALT;
Texture : NO APPARENT TOP OR LOWER CHILL MARGINS
INTACT-ACTUALLY TOP AND BOTTOM OF THIS UNIT ARE
MISSING;
Comments : UNIT 2 OF 4 UNITS IN THIS SECTION;
Leg : 61 Top/Bottom Interval(mm): 1230/1500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 587.50
Core: 21 Top of Core Depth (m) : 586.00
Sect: 1 Top of Section Depth(m): 587.23
LITHOLOGY: BASALT SILL;
RED "BAKED" SEDIMENT (123-125);
Piece No. : PCE NO PCE NUMBERS ASSIGNED;
Structure : BASALT SILL;
Texture : THE UPPER BOUNDARY IS MARKED BY A GLASSY
MARGIN WITH RED "BAKED" SEDIMENT (123-125);
Comments : UNIT 3 OF 4 UNITS IN THIS SECTION;
Leg : 61 Top/Bottom Interval(mm): 0/ 260 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 587.76
Core: 21 Top of Core Depth (m) : 586.00
Sect: 2 Top of Section Depth(m): 587.50
LITHOLOGY: BASALT SILL FRAGMENTS AND RED BAKED SEDIMENT;
Piece No. : PCE NO PCE NUMBERS ASSIGNED;
Texture : THE FRAGMENTS IN THE TOP OF THIS SECTION INCLUDE:
1) TWO BASALT FRAGMENTS WHICH CONTAIN GLASSY
MARGINS, 2) TWO BASALT FRAGMENTS WHICH LACK GLASSY
MARGINS, AND 3) ONE SMALL FRAGMENT OF RED (10R4/6)
BAKED SEDIMENT WITH A PORTION OF GLASSY MARGIN OF
A SILL, NONE OF THESE FRAGMENTS ARE IN STRATIGRAPHIC
ORDER AND THEREFORE IT IS IMPOSSIBLE TO DISTINGUISH
IF THESE MISCELLANEOUS FRAGMENTS REPRESENT THE
BOTTOM OF A CHILLED MARGIN OF UNIT 3 OR THE UPPER
CHILLED MARGIN OF UNIT 4, IT IS LIKELY THAT BOTH
ARE PRESENT;
Leg : 61 Top/Bottom Interval(mm): 260/ 580 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 588.08
Core: 21 Top of Core Depth (m) : 586.00
Sect: 2 Top of Section Depth(m): 587.76
LITHOLOGY: BASALT SILL;
Piece No. : PCE NO PCE NUMBERS ASSIGNED;
Structure : BASALT SILL;
Texture : AT (26-29) GRAIN SIZE INCREASES DOWNWARD;
Comments : UNIT 4;
Leg : 61 Top/Bottom Interval(mm): 0/ 920 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 588.92
Core: 22 Top of Core Depth (m) : 588.00
Sect: 1 Top of Section Depth(m): 588.00
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1 (0-5), 2 (5-14), 3 (16-19), 4A (21-27),
4B (27-38), 4C (38-45), 4D (45-56), 4E (56-74),
4F (75-82), 4G (80-92);
Structure : MASSIVE DOLERITE SILL WITH VEINS;
Texture : APHYRIC, CHILLED MARGIN AND TRANSITIONAL ZONE OF
SILL, GRAIN SIZE BECOMES COARSER TOWARD CENTER OF
THE SECTION;
Alteration : SLIGHTLY TO MOD;
Leg : 61 Top/Bottom Interval(mm): 920/1350 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 589.35
Core: 22 Top of Core Depth (m) : 588.00
Sect: 1 Top of Section Depth(m): 588.92
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 4H (92-111), TOP 14CM OF 4I (111-142);
Structure : MASSIVE BASALT SILL;
Texture : AT CHILLED MARGINS CPX>>PLAG WHILE AT THE TRANSITION
ZONE (IN 0-90CM INTERVAL) CPX=PLAG, THE RATIO OF CPX
PLAG MICROPHENOS MAY DECREASE TOWARD THE INTERIOR OF
THE SILL, APHANITIC, APHYRIC TO MICROPHYRIC;
Alteration : MOD;
Comments : APHYRIC BASALT IS GREENISH GRAY (5G4/1) AND
APHANITIC BASALT IS MED BLUISH GRAY (5B5/1), LOWER
SILL BOUNDARY AT 135CM IS SHARP, THE 135CM INTERVAL
IS THE BOUNDARY BETWEEN SILL INTERIOR AND SLIGHTLY
APHYRIC BASALT FROM 135 TO 145CM;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
Leg : 61 Top/Bottom Interval(mm): 1350/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 589.50
Core: 22 Top of Core Depth (m) : 588.00
Sect: 1 Top of Section Depth(m): 589.35
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE BOTTOM 7CM OF 4I (111-142), 4J (142-150);
Structure : MASSIVE BASALT SILL;
Texture : APHYRIC;
Comments : APHYRIC BASALT IS GREENISH GRAY (5G4/1);
Alteration : MOD;
Leg : 61 Top/Bottom Interval(mm): 0/1100 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 590.60
Core: 22 Top of Core Depth (m) : 588.00
Sect: 2 Top of Section Depth(m): 589.50
LITHOLOGY: SEDIMENT;
Leg : 61 Top/Bottom Interval(mm): 1100/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 591.00
Core: 22 Top of Core Depth (m) : 588.00
Sect: 2 Top of Section Depth(m): 590.60
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
EACH ZONE IS SAME AS MENTIONED IN 22-1;
Piece No. : PCE 1 (110-125), 2A (126-143), 2B (130-150);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : DOLERITIC, INTERVAL (110-115) IS A CHILLED
MARGIN, INTERVAL (115-130) IS A TRANSITIONAL ZONE
FROM THE CHILLED MARGIN ABOVE TO THE APHANITIC
ZONE AT (130-150);
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 592.45
Core: 22 Top of Core Depth (m) : 588.00
Sect: 3 Top of Section Depth(m): 591.00
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
MINERAL ASSEMBLAGES, ALTERATION, AND COLOR ARE THE
SAME AS MENTIONED IN SECTION 22-1;
Piece No. : PCE 1A (0-10), 1B (10-25), 1C (26-41), 1D (41-47),
1E (47-61), 1F (61-75), 1G (75-85), 1H (85-94),
1I (94-99), 1J (100-115), 1K (115-135),
1L (135-145);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : PCE 1A IS MEDIUM TO FINE-GRAINED, PCE 1F IS SLIGHTLY
COARSE-GRAINED, PCE 1L IS MEDIUM TO FINE-GRAINED, AL
3 PCES ARE APHANITIC, GRAIN SIZE BECOMES GRADUALLY
COARSER FROM THE TOP OF THE SECTION TO 70CM AND THEN
DECREASES TOWARD THE BOTTOM OF THE SECTION;
Alteration : MOD;
Leg : 61 Top/Bottom Interval(mm): 0/1410 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 593.91
Core: 22 Top of Core Depth (m) : 588.00
Sect: 4 Top of Section Depth(m): 592.50
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
MINERAL ASSEMBLAGES ARE THE SAME AS IN 22-1;
Piece No. : PCE 1A (0-21), 1B (21-50), 1C (50-85), 1D (85-100),
1E (100-125), 1F (125-141);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : FROM 0 TO 90CM MEDIUM TO FINE GRAIN SIZE,
FROM 90CM TO 124CM SLIGHTLY COARSE GRAIN SIZE, AND
125CM TO 150CM IS A TRANSITIONAL ZONE;
Alteration : MOD;
Leg : 61 Top/Bottom Interval(mm): 0/1250 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 595.25
Core: 22 Top of Core Depth (m) : 588.00
Sect: 5 Top of Section Depth(m): 594.00
LITHOLOGY: MASSIVE BASALT (DOLERITE);
MINERAL ASSEMBLAGES, ALTERATION AND COLOR AS
MENTIONED IN SECTION 22-1;
Piece No. : PCE 1A (0-20), 1B (21-50), 1C (50-65), 1D (66-80),
1E (80-95), 1F (96-122);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : INTERVAL (0-25) IS FINE-GRAINED, INTERVAL (25-124) I
FINE TO MED-GRAINED;
Alteration : MOD
SAME AS IN SECTION 22-1;
Comments : COLOR SAME AS IN SECTION 22-1;
Leg : 61 Top/Bottom Interval(mm): 0/ 230 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 597.23
Core: 23 Top of Core Depth (m) : 597.00
Sect: 1 Top of Section Depth(m): 597.00
LITHOLOGY: SEDIMENT;
Comments : BAKED SEDIMENT VERY DARK RED (5R2/6) AT 22-23CM;
Leg : 61 Top/Bottom Interval(mm): 230/ 600 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 597.60
Core: 23 Top of Core Depth (m) : 597.00
Sect: 1 Top of Section Depth(m): 597.23
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1A (23-60);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : APHANITIC, FROM 21-23CM (PCE 1A) BASALT IS SLIGHTLY
PHYRIC, TRANSITIONAL, FROM 30-60CM (PCE 1A) BASALT
IS FINE-GRAINED;
Alteration : MOD;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
PLAGIOCLASE
MICROPHENOS, THE RATIO OF CPX:PLAG OF MICROPHENOS
DECREASES TOWARD THE INTERIOR OF THE SILL;
Leg : 61 Top/Bottom Interval(mm): 600/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 598.50
Core: 23 Top of Core Depth (m) : 597.00
Sect: 1 Top of Section Depth(m): 597.60
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1B ((57-86), 1C (86-94), 1D (94-102),
1E (102-121), 1F (121-130), 1G (130-142),
1H (142-150);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : FINE TO MEDIUM GRAIN SIZE (APHANITIC), GLASS;
Alteration : MOD
SAME AS IN SECTION 22-1;
Comments : COLOR SAME AS IN SECTION 22-1;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
PLAGIOCLASE
MICROPHENOS, THE RATIO OF CPX:PLAG DECREASES
TOWARD THE INTERIOR OF THE SILL;
Groundmass : PLAGIOCLASE
MICROLITES;
CLINOPYROXENE
MICROLITES;
MAGNETITE
MICROLITES;
Leg : 61 Top/Bottom Interval(mm): 0/ 740 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 599.24
Core: 23 Top of Core Depth (m) : 597.00
Sect: 2 Top of Section Depth(m): 598.50
LITHOLOGY: MASSIVE DOLERITE SILL (DOLERITE);
Piece No. : PCE 1A (0-30), 1B (30-60), 1C (60-73);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : SPARSELY PHYRIC, VARIES TO APHYRIC ABOUT 55-74CM
ZONE, 0-50CM IS FINE-MEDIUM GRAINED, INTERVAL
50-70CM IS FINER GRAINED (TRANSITIONAL ZONE),
INTERVAL 70-74CM IS SPARSELY PHYRIC TO APHYRIC;
Alteration : MOD
SAME AS IN SECTION 22-1;
Comments : COLOR SAME AS IN SECTION 22-1;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
Leg : 61 Top/Bottom Interval(mm): 740/ 910 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 599.41
Core: 23 Top of Core Depth (m) : 597.00
Sect: 2 Top of Section Depth(m): 599.24
LITHOLOGY: SEDIMENT;
Leg : 61 Top/Bottom Interval(mm): 910/1450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 599.95
Core: 23 Top of Core Depth (m) : 597.00
Sect: 2 Top of Section Depth(m): 599.41
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
MINERAL ASSEMBLAGE, COLOR, ALTERATION, AND COLOR ARE
SAME AS IN 23-1;
Piece No. : PCE 2A (91-100), 2B (100-108), 2C (109-118),
2D (118-150);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : SPARSELY PHYRIC TO APHYRIC, GRAIN SIZE BECOMES
GRADUALLY COARSER TOWARD THE BOTTOM OF THIS
SECTION;
Alteration : MOD
SAME AS IN SECTION 22-1;
Comments : COLOR SAME AS IN SECTION 22-1;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 601.50
Core: 23 Top of Core Depth (m) : 597.00
Sect: 3 Top of Section Depth(m): 600.00
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
COLOR AND MINERAL ASSEMBLAGE ARE THE SAME AS IN
SECTION 23-1;
Piece No. : PCE 1A (0-5), 1B (6-16), 1C (16-22), 2A (24-34),
2B (35-43), 3 (47-42), 4A (55-63), 4B (63-70),
5 (72-85), 6 (85-95), 7 (99-105), 8 (107-112),
9 (115-117), 10 (120-123), 11 (125-141),
12 (145-150);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : MICROPHYRIC, FINE TO MEDIUM-GRAINED DOLERITE;
Alteration : MOD;
EXT;
PCE 7 AT 98CM TO 104CM IS BADLY ALTERED TO CLAY;
Comments : COLOR SAME AS IN SECTION 23-1;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS, RATIO OF CPX:PLAG<=1;
Replacement: CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1000 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 602.50
Core: 23 Top of Core Depth (m) : 597.00
Sect: 4 Top of Section Depth(m): 601.50
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
COLOR, MINERAL ASSEMBLAGE, AND ALTERATION ARE THE
SAME AS IN SECTION 23-1;
Piece No. : PCE 1 (1-5), 2 (10-15), 3A (16-27), 3B (28-36),
3C (36-42), 3D (42-70), 3E (70-80), 4 (81-92);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : PCES 1-3C ARE FINE TO MEDIUM-GRAINED AND ARE
MICROPHYRIC, IN PCES 1D TO 4 BASALT HAS A MEDIUM TO
COARSE GRAIN SIZE AND INCLUDES CPX PHENOS;
Alteration : MOD
SAME AS IN SECTION 23-1;
Comments : COLOR SAME AS IN SECTION 23-1;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
RATIO OF CPX:PLAG<1;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 607.50
Core: 24 Top of Core Depth (m) : 606.00
Sect: 1 Top of Section Depth(m): 606.00
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
APHYRIC MICRODOLERITES;
Piece No. : 2D (35-50), 2E (50-98), 2F (92-110), 2G (110-125),
3 (125-141), 4 (145-150);
Structure : MASSIVE BASALT SILL WITH THIN VEINS (0.5-2MM) WHICH
CONSIST OF CHLORITE AND PYRITE, BUT QUARTZ IN THE
THICKER VEINS;
Texture : APHYRIC, MICRODOLERITES ARE FINE TO MEDIUM
GRAINED, INTERVALS (24-32) AND (80-107)
ARE MORE FINE-GRAINED;
Alteration : EXT;
Groundmass : PYROXENE
Replacement: CHLORITE
Minerals Replaced: PYX
PYRITE
QUARTZ
Leg : 61 Top/Bottom Interval(mm): 0/1410 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 608.91
Core: 24 Top of Core Depth (m) : 606.00
Sect: 2 Top of Section Depth(m): 607.50
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
SAME AS SECTION 24-1;
Piece No. : PCE 1 (0-20), 2 (20-30), 3A (32-60), 3B (61-70),
4A (71-75), 4B (72-80), 5A (82-106), 5B (106-122),
5C (122-127), 5D (125-140);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : MICRODOLERITES;
Alteration : EXT
BOTTOM OF PCE 1, TOP 15CM OF PCE 3A, AND PCES
3B-5A;
FRESH
REMAINDER IS FRESH;
Comments : SAME UNIT AS 24-1;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 610.50
Core: 24 Top of Core Depth (m) : 606.00
Sect: 3 Top of Section Depth(m): 609.00
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1A (0-6), 1B (6-10), 1C (10-30), 2A (33-45),
2B (45-50), 2C (50-60), 2D (60-73), 2E (74-85),
3 (86-99), 4 (101-107), 5A (110-122), 5B (122-131),
5C (131-150);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : FINE TO MEDIUM-GRAINED MICRODOLERITES, MICRODOLERITE
IN INTERVALS (0-30) AND (110-150) ARE FINER GRAINED;
Alteration : EXT;
Comments : SAME UNIT AS SECTION 24-2;
Leg : 61 Top/Bottom Interval(mm): 0/ 670 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 611.17
Core: 24 Top of Core Depth (m) : 606.00
Sect: 4 Top of Section Depth(m): 610.50
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
SAME MICRODOLERITES AS SECTION 24-3;
Piece No. : PCE 1 (0-5), 2 (6-17), 3A (20-35), 3B (35-46),
4 (49-65);
Structure : MASSIVE BASALT SILL WITH VEINS;
Texture : FINE TO MEDIUM-GRAINED MICRODOLERITES,
INTERVAL (45-65) IS FINE-GRAINED, COARSER PYX
SPOTS OCCUR WITHIN MEDIUM-GRAINED INTERVALS;
Alteration : EXT;
Comments : MICRODOLERITES OF CORE 24 BELONG TO A SINGLE SILL
AND GRAIN SIZE VARIATIONS ARE COMMON;
Groundmass : PYROXENE
PYX SPOTS OCCUR WITHIN MED-GRAINED INTERVALS;
Leg : 61 Top/Bottom Interval(mm): 0/ 520 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 615.52
Core: 25 Top of Core Depth (m) : 615.00
Sect: 1 Top of Section Depth(m): 615.00
LITHOLOGY: PLAG-CPX SPARSELY PHYRIC BASALT;
Piece No. : PCE 1 (0-8), 2 (10-15), 3 (17-21), 4 (25-27),
5 (30-43), 6 (45-51);
Structure : MASSIVE BASALT SILL;
Texture : SPARSELY PHYRIC, MEDIUM-GRAINED;
Alteration : ALTERED, HIGHER COLOR INDEX APPEARS TO BE A
RESULT OF ALTERATION;
Comments : COLOR INDEX IS HIGHER THAN BEFORE, AND APPEARS TO
BE CREATED BY ALTERATION;
Phenocrysts: PLAGIOCLASE ( <1%)
Size(mm): 0.77
CLINOPYROXENE ( <1%)
Size(mm): 0.77
Leg : 61 Top/Bottom Interval(mm): 520/ 740 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 615.74
Core: 25 Top of Core Depth (m) : 615.00
Sect: 1 Top of Section Depth(m): 615.52
LITHOLOGY: DOLERITE FRAGMENTS;
Piece No. : PCE 7 (53-73);
Structure : MASSIVE BASALT SILL;
Texture : DOLERITE FRAGMENTS, SOME OF WHICH ARE FINER
GRAINED;
Comments : POSSIBLE SILL BOUNDARY IN THIS SECTION SUGGESTED
BY SOME DOLERITE FRAGMENTS WITH FINE GRAIN SIZE;
Leg : 61 Top/Bottom Interval(mm): 740/1310 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 616.31
Core: 25 Top of Core Depth (m) : 615.00
Sect: 1 Top of Section Depth(m): 615.74
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
DOLERITE;
Piece No. : PCE 8 (75-86), 9 (90-99), 10 (101-117),
11 (119-131);
Structure : MASSIVE BASALT SILL;
Texture : SPARSELY PHYRIC, MEDIUM-GRAINED DOLERITE;
Comments : THIS DOLERITE IS MORE LEUCOCRATIC THAN THE PREVIOUS
UNIT;
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): <0.5-1
MOST ARE <0.5MM, BUT SOME ARE 1MM IN SIZE;
Leg : 61 Top/Bottom Interval(mm): 0/ 200 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 626.20
Core: 27 Top of Core Depth (m) : 626.00
Sect: 1 Top of Section Depth(m): 626.00
LITHOLOGY: CAVINGS;
Leg : 61 Top/Bottom Interval(mm): 200/ 480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 626.48
Core: 27 Top of Core Depth (m) : 626.00
Sect: 1 Top of Section Depth(m): 626.20
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1 (21-25), 2 (29-32), 3 (35-40), 4 (43-47);
Structure : MASSIVE BASALT SILL, FEW CLAY VEINS;
Texture : DOLERITE HAS A FINER GRAIN SIZE, A FEW PHENOS
(<<1%,<0.5MM) OF PLAG+CPX;
Alteration : MOD;
Comments : MORE MELONOCRATIC (HIGHER COLOR INDEX) THAN BELOW
48CM;
Phenocrysts: CLINOPYROXENE ( <<1%)
Size(mm): <0.5
PLAGIOCLASE ( <<1%)
Size(mm): <0.5
Leg : 61 Top/Bottom Interval(mm): 480/1350 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 627.35
Core: 27 Top of Core Depth (m) : 626.00
Sect: 1 Top of Section Depth(m): 626.48
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
CPX-PLAG SPARSELY PHYRIC BASALT;
Piece No. : PCE 5 (50-57), 6 (60-70), 7 (71-80), 8 (82-99),
9 (101-110), 10 (112-120), 11 (121-130);
Structure : MASSIVE BASALT SILL, VEIN OF CALCITE+GREEN CLAY+
PYRITE+CHLORITE AT 52CM;
Texture : SPARSELY PHYRIC, MANY AMOEBOID CLAY PATCHES (1-2MM),
FROM 48 TO 85CM THE GRAIN SIZE IS COARSER THAN ABOVE
48CM AND GRAIN SIZE BELOW 85CM DECREASES DOWNWARD;
Alteration : MOD;
Phenocrysts: CLINOPYROXENE
Size(mm): <0.5
A FEW PERCENT OF CPX PHENOS;
PLAGIOCLASE ( RARE%)
Replacement: CALCITE
CLAY
GREEN CLAY;
CHLORITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1430 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 628.93
Core: 27 Top of Core Depth (m) : 626.00
Sect: 2 Top of Section Depth(m): 627.50
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1 (0-18), 2 (20-29), 3 (30-36), 4 (40-45),
5 (48-55), 6 (57-80), 7 (72-91), 8 (93-101),
9 (104-128), 10 (130-141);
Structure : MASSIVE BASALT SILL, CLAY AND CLAY+CHLORITE VEINS;
Texture : FROM 0 TO 100CM GRAIN SIZE DECREASES DOWNWARD, FROM
100 TO 130CM IS A ZONE OF FINER GRAIN SIZE, AND BELO
130CM GRAIN SIZE INCREASES DOWNWARD;
Alteration : ALTERED;
Replacement: CLAY
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 630.49
Core: 27 Top of Core Depth (m) : 626.00
Sect: 3 Top of Section Depth(m): 629.00
LITHOLOGY: PLAG-CPX SPARSELY PHYRIC DOLERITE;
MASSIVE BASALT;
Piece No. : PCE 1 (0-21), 2 (25-52), 3 (54-81), 4 (83-106),
5 (108-130), 6 (132-149);
Structure : MASSIVE, THIN CLAY VEINS PERMEATE ALL ROCKS;
Texture : SPARSELY PHYRIC, INCREASING GRAIN SIZE DOWNWARD;
Alteration : SLIGHTLY;
Comments : MORE MELANOCRATIC DOWNWARD;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
Leg : 61 Top/Bottom Interval(mm): 0/1440 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 631.44
Core: 28 Top of Core Depth (m) : 630.00
Sect: 1 Top of Section Depth(m): 630.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-31), 2 (55-63), 3 (65-68), 4 (70-100),
5A (100-115), 5B (115-128), 6A (130-138);
Structure : MASSIVE BASALT SILL WITH VEINS WHICH ARE FILLED WITH
CALCITE+CHLORITE+PYRITE+CLAY(SMEC OR PALAG);
Texture : APHYRIC TO MICROPHYRIC, FINE TO MEDIUM-GRAINED
DOLERITE, MICROLITES OF PLAG+CPX+MAGN;
Alteration : SLIGHTLY;
Comments : COLOR MEDIUM BLUISH GRAY 5B5/1;
Phenocrysts: CLINOPYROXENE
MICROPHENOS, PARTLY ALTERED TO CLAYS;
PLAGIOCLASE
MICROPHENOS, RATIO OF CPX TO PLAG IS ABOUT 1;
Replacement: CALCITE
CHLORITE
PYRITE
CLAY MINERALS
SMEC OR PALAG;
Leg : 61 Top/Bottom Interval(mm): 0/1440 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 631.44
Core: 28 Top of Core Depth (m) : 630.00
Sect: 1 Top of Section Depth(m): 630.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1B (32-39), 1C (39-54), 6B (139-144);
Structure : MASSIVE BASALT SILL WITH VEINS WHICH ARE FILLED WITH
CALCITE+CHLORITE+PYRITE+CLAY (SMEC OR PALAG);
Texture : MICROPHYRIC, MEDIUM TO SLIGHTLY COARSE-GRAINED
DOLERITE;
Alteration : SLIGHTLY;
Comments : COLOR MEDIUM BLUISH GRAY 5B5/1;
Phenocrysts: CLINOPYROXENE
MICROPHENOS, PARTLY ALTERED TO CLAYS;
PLAGIOCLASE
MICROPHENOS, RATIO OF CPX TO PLAG IS ABOUT 1;
Replacement: CALCITE
CHLORITE
PYRITE
CLAY MINERALS
SMEC OR PALAG;
Leg : 61 Top/Bottom Interval(mm): 0/1430 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 632.93
Core: 28 Top of Core Depth (m) : 630.00
Sect: 2 Top of Section Depth(m): 631.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS SECTION 28-1;
Piece No. : PCE 1A (0-17), 1B (17-36), 1C (36-43), 1D (43-54),
2A (55-66), 2B (66-80), 2C (80-97), 2D (97-105),
2E (106-118), 2F (119-130), 2G (130-141);
Structure : MASSIVE BASALT SILL WITH VEINS FILLED WITH CALCITE,
CHLORITE+PYRITE+CLAY, IN INTERVALS (72-76) AND
(134-138) SPHERULITIC PLAG AGGREGATE (2 TO 3MM IN
DIAMETER);
Texture : MICROPHYRIC, MEDIUM TO SLIGHTLY COARSE-GRAINED
DOLERITE, INTERVALS (72-76) AND (134-138) ARE
COARSE-GRAINED, LOWER BOUNDARIES OF INTERVALS ARE
GRADUAL (GRANOPHYRE);
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
Replacement: CALCITE
CHLORITE
PYRITE
CLAY MINERALS
Comments : THE UPPER BOUNDARIES OF ZONES (72-76) AND (134-138)
ARE SHARP BUT LOWER BOUNDARIES ARE GRADUAL
(GRANOPHYRE);
Leg : 61 Top/Bottom Interval(mm): 0/ 660 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 633.66
Core: 28 Top of Core Depth (m) : 630.00
Sect: 3 Top of Section Depth(m): 633.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SEE SECTION 28-1;
Piece No. : PCE 1 (0-11), 2A (15-20), 2B (20-29), 2C (30-40),
2D (40-47), 3A (50-57), 3B (57-66);
Structure : MASSIVE BASALT SILL, QUARTZ VEINS IN PCES 2A+2B+3A;
Texture : MICROPHYRIC, MEDIUM TO SLIGHTLY COARSE-GRAINED
DOLERITE;
Alteration : SLIGHTLY
ALTERATION OCCURS IN PCES 2A+2B+3A;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
Replacement: QUARTZ
IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 660/1400 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 634.40
Core: 28 Top of Core Depth (m) : 630.00
Sect: 3 Top of Section Depth(m): 633.66
LITHOLOGY: MASSIVE DOLERITE SILL;
SEE SECTION 28-1;
Piece No. : PCE 3C (66-76), 3D (76-100), 3E (100-110),
3F (110-125), 3G (126-139);
Structure : MASSIVE BASALT SILL, CALCITE+CHLORITE+PYRITE+CLAY
VEINS;
Texture : APHYRIC TO SPARSELY PHYRIC, FINE TO MEDIUM-GRAINED
DOLERITE;
Alteration : SLIGHTLY
ALTERATION IN PCES 3C+3F+3G PROCEEDS ALONG VEINS
WITH PYRITE;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
Replacement: CALCITE
CHLORITE
PYRITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 635.95
Core: 28 Top of Core Depth (m) : 630.00
Sect: 4 Top of Section Depth(m): 634.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-16), 1B (17-36), 1C (36-45), 2A (49-60),
2B (60-75), 2C (75-85), 2D (85-102), 2E (102-110),
2F (110-122), 2G (122-125), 2H (125-135),
2I (135-145);
Structure : MASSIVE BASALT SILL WITH VEINS, PYRITE IN VEINS;
Texture : APHYRIC TO SPARSELY PHYRIC, DOLERITE IS FINE TO
MEDIUM-GRAINED;
Alteration : MOD
ALTERATION IN PCES 1A+2A PROCEEDS ALONG VEIN
WITH PYRITE;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS;
Replacement: PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 636.50
Core: 28 Top of Core Depth (m) : 630.00
Sect: 5 Top of Section Depth(m): 636.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS SECTION 28-1;
Piece No. : PCE 1 (0-27), 2 (28-40), 3 (43-49);
Structure : MASSIVE BASALT SILL;
Texture : APHYRIC TO SPARSELY PHYRIC, FROM 0 TO 27CM AND FROM
33 TO 48CM DOLERITE IS FINE TO MEDIUM-GRAINED, FROM
27 TO 33 DOLERITE IS MEDIUM TO SLIGHTLY COARSE-
GRAINED AND HAS PLAG PHENOS AND IS IN PART
GLOMEROPHYRIC;
Alteration : SLIGHTLY
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
Leg : 61 Top/Bottom Interval(mm): 0/1250 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 637.25
Core: 29 Top of Core Depth (m) : 636.00
Sect: 1 Top of Section Depth(m): 636.00
LITHOLOGY: MASSIVE DOLERITE SILL;
APPEARS TO BE THE SAME AS 28-1;
Piece No. : PCE 1A (0-25), 1B (25-80), 1C (80-93), 1D (92-125);
Structure : MASSIVE BASALT SILL WITH THIN PYRITE+CLAY+CHLORITE
VEINS, FROM 59 TO 61CM VEIN-LIKE SEPARATION BEARING
COARSE (4-5MM) QTZ-FELDSPAR (GRANOPHYRIC
AGGREGATES), MARGINS OF THIS SEPARATION ARE FINE-
GRAINED AND ENRICHED IN DARK MINERALS, IN THE
THICKER VEINS, PYRITE IS CUBIC AND PENTAGONAL
DODECAHEDRIC AS COMPARED WITH THIN FILMS IN
PREVIOUS CORES;
Alteration : EXT;
Texture : APHYRIC TO SPARSELY PHYRIC, MEDIUM-GRAINED
DOLERITE, A COARSE GRAINED SEPARATION (PLAG TO 5MM,
ALTERED PYX TO 4MM) AT 59 TO 61CM;
Phenocrysts: PLAGIOCLASE
LARGEST 5MM AT VEIN-LIKE SEPARATION;
CLINOPYROXENE
LARGEST 4MM AT VEIN-LIKE SEPARATION;
Groundmass : PYROXENE
SLIGHTLY ALTERED TO PALE GRAYISH-GREEN CLAY;
Replacement: CLAY
Minerals Replaced: PYX
PALE GRAYISH -GREEN CLAY;
Leg : 61 Top/Bottom Interval(mm): 0/1250 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 638.75
Core: 29 Top of Core Depth (m) : 636.00
Sect: 2 Top of Section Depth(m): 637.50
LITHOLOGY: MASSIVE BASALT (DOLERITE);
Piece No. : PCE 1A (0-6), 1B (6-30), 1C (30-64), 1D (51-70),
1E (66-75), 1F (72-100), 1G (100-120);
Structure : MASSIVE BASALT SILL WITH VEINS, TWO SYSTEMS OF
FRACTURES ARE DISTINCTLY DEVELOPED: 30 DEGREE AND
60 DEGREE INCLINATIONS RELATIVE TO A VERTICAL AXIS;
Texture : MEDIUM-GRAINED DOLERITES, DOLERITE OF SECTION 2 IS
SLIGHTLY MORE COARSE-GRAINED AND ENRICHED IN DARK
CLAY SPOTS AS COMPARED WITH 29-1;
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 640.45
Core: 29 Top of Core Depth (m) : 636.00
Sect: 3 Top of Section Depth(m): 639.00
LITHOLOGY: MASSIVE BASALT;
Piece No. : PCE 1A (0-30), 1B (30-52), 1C (53-77), 1D (77-116),
1E (116-145);
Structure : MASSIVE BASALT WITH VEINS, TWO SYSTEMS OF FRACTURES
ARE DISTINCTLY DEVELOPED: 30 DEGREE AND 60 DEGREE
INCLINATIONS RELATIVE TO VERTICAL AXIS;
Texture : APHYRIC, MEDIUM-GRAINED DOLERITES;
Alteration : EXT;
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 641.90
Core: 29 Top of Core Depth (m) : 636.00
Sect: 4 Top of Section Depth(m): 640.50
LITHOLOGY: MASSIVE BASALT (DOLERITE);
SAME DOLERITE AS SECTION 29-4;
Piece No. : PCE 1A (0-62), 1B (63-82), 1C (82-145);
Structure : MASSIVE BASALT WITH VEINS;
Texture : MEDIUM-GRAINED DOLERITE, FROM 80 TO 140CM DOLERITE
IS SLIGHTLY FINER GRAINED, AND DOES NOT HAVE DARK
COARSE SPOTS;
Leg : 61 Top/Bottom Interval(mm): 0/ 970 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 642.97
Core: 29 Top of Core Depth (m) : 636.00
Sect: 5 Top of Section Depth(m): 642.00
LITHOLOGY: MASSIVE BASALT (DOLERITE);
Piece No. : PCE 1A (0-10), 1B (12-35), 1C (35-94);
Structure : MASSIVE BASALT WITH VEINS, THICK VEIN (7-9CM)
INCLUDES A LATER OCCURRENCE OF CALCITE IN ADDITION
TO PYRITE+CLAY+CHLORITE NORMALLY FORMING THE
VEINS;
Texture : MEDIUM-GRAINED (AS IN 80-140CM OF 29-4);
Alteration : ALTERED ABOUT VEINS;
Replacement: CALCITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1020 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 644.52
Core: 29 Top of Core Depth (m) : 636.00
Sect: 6 Top of Section Depth(m): 643.50
LITHOLOGY: MASSIVE BASALT (DOLERITE);
SAME DOLERITE AS SECTION 29-5;
Piece No. : PCE 1A (0-100);
Structure : MASSIVE BASALT WITH VEINS, VEINS ARE TYPICALLY
COMPOSED OF A COMBINATION OF PYRITE+CLAY+CHLORITE
AND THICKER VEINS ALSO INCLUDE CALCITE;
Texture : MEDIUM-GRAINED (AS IN 29-5);
Alteration : ALTERED ABOUT VEINS;
Replacement: CALCITE
IN LARGER VEINS;
PYRITE
CHLORITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 646.49
Core: 30 Top of Core Depth (m) : 645.00
Sect: 1 Top of Section Depth(m): 645.00
LITHOLOGY: CPX MOD PHYRIC DOLERITE;
MASSIVE BASALT SILL;
Piece No. : PCE 1 (0-4), 2 (5-62), 3 (64-71), 4 (74-77),
5 (80-149);
Structure : MASSIVE BASALT SILL, FROM 80 TO 90CM DOLERITE HAS A
QTZ OR CHALC OR ZEOLITE VEIN WHICH IS WHITE WITH
CLAY MARGINS, IN ADDITION, THIN (<0.1MM) CLAY VEINS
OCCURS AT INCLINATIONS OF 15 TO 20 DEGREES FROM
HORIZONTAL;
Texture : MOD PHYRIC, UNIFORMLY MEDIUM-GRAINED (AS IN SECTION
29-1);
Alteration : FRESH
NO APPARENT ALTERATION OF THE GNDMASS;
Phenocrysts: CLINOPYROXENE ( 4%)
Size(mm): <0.5
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
HOMOGENEOUS MATRIX, NO APPARENT ALTERATION;
Replacement: QTZ OR CHALC OR ZEOL IN VEIN;
CLAY MINERALS
IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 647.98
Core: 30 Top of Core Depth (m) : 645.00
Sect: 2 Top of Section Depth(m): 646.50
LITHOLOGY: DOLERITE;
MASSIVE BASALT SILL;
SAME SILL AS IN SECTION 30-1;
Piece No. : PCE 1 (0-148);
Structure : MASSIVE BASALT SILL,THERE ARE THREE VEIN TYPES: 1)
CALCITE (0 TO 5CM), 2) WHITE QTZ OR CHALC OR ZEOL
WHICH HAS CLAY MARGINS, AND 3) THIN (<0.1MM) CLAY;
Texture : UNIFORMLY MED-GRAINED DOLERITE;
Alteration : FRESH
NO APPARENT ALTERATION OF THE GNDMASS;
Phenocrysts: CLINOPYROXENE ( 4%)
Size(mm): <0.5
Replacement: QTZ OR CHALC OR ZEOL IN VEIN;
CLAY MINERALS
IN VEINS;
Comments : INDISTINGUISHABLE IN ANY FEATURES FROM PREVIOUS
SECTION;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 649.48
Core: 30 Top of Core Depth (m) : 645.00
Sect: 3 Top of Section Depth(m): 648.00
LITHOLOGY: MASSIVE DOLERITE;
BASALT SILL;
SAME SILL AS IN SECTIONS 30-1 AND 30-2;
Piece No. : PCE 1 (0-148);
Structure : MASSIVE BASALT SILL, THERE ARE THREE VEIN TYPES: 1)
CALCITE, 2) WHITE QTZ OR CHALC OR ZEOL
WHICH HAS CLAY MARGINS, AND 3) THIN ABUNDANT CLAY
VEINS (<0.1MM) REGULARLY SPACED AT 2 TO 3CM
INTERVALS AND THEY DIP 15 TO 25 DEGREES RELATIVE TO
HORIZONTAL;
Texture : UNIFORMLY MEDIUM-GRAINED DOLERITE;
Alteration : FRESH
NO APPARENT ALTERATION OF THE GNDMASS;
Phenocrysts: CLINOPYROXENE ( 4%)
Size(mm): <0.5
Replacement: QTZ OR CHALC OR ZEOL IN VEIN;
CLAY MINERALS
IN VEINS;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
HOMOGENEOUS MATRIX, NO APPARENT ALTERATION;
Leg : 61 Top/Bottom Interval(mm): 0/1320 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 650.82
Core: 30 Top of Core Depth (m) : 645.00
Sect: 4 Top of Section Depth(m): 649.50
LITHOLOGY: MASSIVE DOLERITE;
BASALT SILL;
SAME SILL AS IN SECTIONS 30-1 TO 30-4;
Piece No. : PCE 1 (0-132);
Structure : MASSIVE BASALT SILL WITH VEINS, THERE ARE THREE VEIN
TYPES: 1) CALCITE, 2) WHITE QTZ OR CHALCEDONY OR
ZEOLITE VEINS WITH CLAYEY MARGINS,
AND 3) THIN (<0.1MM) ABUNDANT CLAY VEINS
REGULARLY SPACED AT 2 TO 3CM INTERVALS AND THEY DIP
15 TO 25 DEGREES RELATIVE TO HORIZONTAL;
Texture : UNIFORMLY MEDIUM-GRAINED DOLERITE;
Alteration : FRESH
NO APPARENT ALTERATION OF GNDMASS;
Phenocrysts: CLINOPYROXENE
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
HOMOGENEOUS MATRIX;
Replacement: CALCITE
WHITE QTZ OR CHALCEDONY OR ZEOLITE IN VEIN;
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 652.40
Core: 30 Top of Core Depth (m) : 645.00
Sect: 5 Top of Section Depth(m): 651.00
LITHOLOGY: MASSIVE DOLERITE;
BASALT SILL;
SAME SILL AS IN SECTIONS 30-1 TO 30-4;
Piece No. : PCE 1 (0-70), 2 (72-140);
Structure : MASSIVE BASALT SILL WITH VEINS, THERE ARE THREE VEIN
TYPES: 1) CALCITE, 2) WHITE QTZ OR CHALCEDONY OR
ZEOLITE WHICH HAVE CLAYEY MARGINS, AND 3) THIN
(<2MM, SLIGHTLY THICKER THAN SECTION 30-4) ABUNDANT
CLAY VEINS REGULARLY SPACED AT 2 TO 3CM INTERVALS
AND THEY DIP 15 TO 25 DEGREES FROM THE HORIZONTAL;
Texture : MEDIUM-GRAINED DOLERITE;
Alteration : FRESH
NO APPARENT ALTERATION OF GNDMASS;
Phenocrysts: CLINOPYROXENE ( 4%)
Size(mm): <0.5
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
HOMOGENEOUS MATRIX;
Replacement: CALCITE
WHITE QTZ OR CHALCEDONY OR ZEOLITE IN VEIN;
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1410 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 653.91
Core: 30 Top of Core Depth (m) : 645.00
Sect: 6 Top of Section Depth(m): 652.50
LITHOLOGY: MASSIVE DOLERITE;
BASALT SILL;
SAME SILL AS IN SECTIONS 30-1 TO 30-5;
Piece No. : PCE 1 (0-120), 2 (121-140);
Structure : MASSIVE BASALT SILL WITH VEINS, THERE ARE THREE VEIN
TYPES: 1) CALCITE, 2) WHITE QTZ OR CHALCEDONY OR
ZEOLITE WHICH HAVE CLAYEY MARGINS, AND 3) THIN
(<2MM, SLIGHTLY THICKER THAN SECTION 30-5) ABUNDANT
CLAY VEINS REGULARLY SPACED AT 2 TO 3CM INTERVALS
AND THEY DIP 15 TO 25 DEGREES FROM THE HORIZONTAL;
Texture : MEDIUM-GRAINED DOLERITE;
Alteration : FRESH
NO APPARENT ALTERATION OF GNDMASS;
Phenocrysts: CLINOPYROXENE ( 4%)
Size(mm): <0.5
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
HOMOGENEOUS MATRIX;
Replacement: CALCITE
WHITE QTZ OR CHALCEDONY OR ZEOLITE, IN VEIN;
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1050 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 655.05
Core: 31 Top of Core Depth (m) : 654.00
Sect: 1 Top of Section Depth(m): 654.00
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1A (0-38), 2A (41-51), 2B (52-60), 3 (65-76),
4A (79-91), 4B (92-95), 5 (97-103);
Structure : MASSIVE BASALT SILL WITH CHLORITE VEINS;
Texture : APHANITIC, SLIGHTLY PHYRIC, FINE TO MEDIUM-GRAINED
DOLERITE;
Alteration : SLIGHTLY;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS;
Groundmass : PLAGIOCLASE
MICROLITES;
CLINOPYROXENE
MICROLITES;
MAGNETITE
MICROLITES;
Replacement: CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/ 500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 656.00
Core: 32 Top of Core Depth (m) : 655.50
Sect: 1 Top of Section Depth(m): 655.50
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1 (0-8), 2A (10-22), 2B (24-37), 3 (41-49);
Structure : MASSIVE WITH CLAY VEINS;
Texture : APHYRIC TO MICROPHYRIC, INTERVAL (30-50) IS
MICROPHYRIC, INTERVAL (0-30) IS FINE-GRAINED;
Alteration : MOD;
Comments : AT 50CM LOWER CONTACT OF THE SILL WITH SEDIMENT, MAY
BE CHILLED?;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS, THE RATIO OF PLAG TO CPX=1;
Replacement: CLAY MINERALS
IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/ 500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 685.50
Core: 36 Top of Core Depth (m) : 685.00
Sect: CC Top of Section Depth(m): 685.10
LITHOLOGY: PLAG-CPX MOD PHYRIC BASALT;
BASALT SILL (DOLERITE);
Piece No. : PCE 1 (2-5), 2 (11-15), 3 (20-26), 4 (32-35);
Structure : BASALT SILL, PCES WITH TEXTURES WHICH RANGE FROM
VERY FINE-GRAINED OR GLASSY (VARIOLITIC?) TO
HOLOCRYSTALLINE MICRODOLERITIC REPRESENT MARGINAL
AND INNER CRYSTALLINE FACIES OF A BASALTIC SILL-
RESPECTIVELY, CLAY VEINS PRESENT;
Texture : MOD PHYRIC, TEXTURES RANGE FROM VERY FINE-GRAINED
OR GLASSY (VARIOLITIC?) TO HOLOCRYSTALLINE
MICRODOLERITIC;
Alteration : ALTERATION IS NOT VISIBLE WITH THE UNAIDED EYE
EXCEPT FOR ONE CLAY VEIN, BUT THESE ROCKS ARE
"GREEN STONES" SUGGESTING SIGNIFICANT GNDMASS
ALTERATION;
Comments : THERE ARE NO ORIENTED PCES AND ALL PCES EXCEPT PCE 5
ARE OUT OF STRATIGRAPHIC ORDER;
Phenocrysts: PLAGIOCLASE ( <<1%)
Size(mm): <0.2
CLINOPYROXENE ( 2%)
Size(mm): 0.03
Replacement: CLAY MINERALS
IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 692.48
Core: 38 Top of Core Depth (m) : 691.00
Sect: 1 Top of Section Depth(m): 691.00
LITHOLOGY: APHYRIC BASALT;
MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1 (1-2), 2 (5-15), 3 (17-22), 4 (27-33),
5 (35-40), 6 (42-148);
Structure : MASSIVE BASALT SILL, MASSIVE GNDMASS OF PLAG;
Texture : APHYRIC WITH A FEW CPX PHENOS (<1%, 0.5MM), FROM
0 TO 30CM GRAIN SIZE INCREASES DOWNWARD, FROM 30 TO
150CM THE GRAIN SIZE IS RELATIVELY CONSTANT;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): 0.5
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
CLAY MINERALS
ROCK HAS A FEW CLAY SPOTS;
Leg : 61 Top/Bottom Interval(mm): 0/1000 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 693.50
Core: 38 Top of Core Depth (m) : 691.00
Sect: 2 Top of Section Depth(m): 692.50
LITHOLOGY: APHYRIC BASALT;
MASSIVE BASALT;
Piece No. : PCE 1 (0-45), 2 (47-89), 3 (94-99);
Structure : MASSIVE BASALT, AT 80-90CM VEINS ARE OF PYRITE+
CALCITE;
Texture : APHYRIC, INTERVAL (0-44) HAS A FEW PLAG AND CPX
PHENOS (<<1%, 0.2-0.3MM), IN THE UPPER PORTION
(AROUND 60CM) A FEW PHENOS OF CPX AND PLAG
(<<1%, 0.2 TO 0.5MM), IN THE UPPER PORTION PLAG
ABUNDANCE IS APPROXIMATELY EQUAL TO CPX, DOWNWARD
GLOMEROPHYRIC CLUSTERS BECOME COMMON AND CPX>PLAG
IN ABUNDANCE, INTERVAL (0-45) THE BASALT GRAIN-SIZE
DECREASES DOWNWARD TO A GLASSY MARGIN AT 44-45CM,
FINE-GRAINED MATRIX, CLAY SPOTS OF ALTERATION ARE
PRESENT FROM THE GLASSY MARGIN (44CM) UPWARD,
GLASSY MARGIN AT 47-48CM, BELOW 48CM GRAIN SIZE
GRADUALLY INCREASES;
Alteration : CLAY ALTERATION SPOTS ARE PRESENT FROM 44CM
UPWARD;
Phenocrysts: CLINOPYROXENE ( <<1%)
Size(mm): 0.2-0.4
INTERVAL (0-45);
COMBINATION ( <<1%)
Size(mm): 0.2-0.5
INCLUDING PLAG+CPX, INTERVAL (48-100);
Replacement: CLAY
CALCITE
IN VEINS;
PYRITE
IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 1000/1300 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 693.80
Core: 38 Top of Core Depth (m) : 691.00
Sect: 2 Top of Section Depth(m): 693.50
LITHOLOGY: CPX MOD PHYRIC BASALT;
Piece No. : PCE 4 (101-109), 5 (112-127);
Structure : MASSIVE BASALT, AT 110 TO 125CM VEINS ARE PYRITE+
CLAY;
Texture : MOD PHYRIC, MEDIUM TO FINE-GRAINED SIZE;
Phenocrysts: CLINOPYROXENE ( 2-4%)
Leg : 61 Top/Bottom Interval(mm): 0/1470 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 693.47
Core: 39 Top of Core Depth (m) : 692.00
Sect: 1 Top of Section Depth(m): 692.00
LITHOLOGY: CPX-PLAG MICROPHYRIC BASALT;
MASSIVE BASALT;
Piece No. : PCE 1 (0-6), 2A (7-22), 2B (22-33), 3 (36-48),
5 (56-65), 6 (70-75), 7 (78-90), 8 (92-100),
9 (100-110), 10A (112-125), 10B (125-131),
10C (135-147);
Structure : MASSIVE BASALT;
VEINS ARE FILLED WITH CHLORITE AND PYRITE AND
CLAY.MINS(SMEC OR PALAG);
Texture : MICROPHYRIC, HYALOPILITIC TO INTERSERTAL, INTERVAL
(0-47) IS FINE TO SLIGHTLY COARSE-GRAINED, INTERVAL
(55-147) IS FINE TO SLIGHTLY MEDIUM-GRAINED,
GRAIN SIZE INCREASES DOWNWARD;
Alteration : SLIGHTLY TO FRESH;
Comments : COLOR OF FINE-GRAINED BASALT-MEDIUM LIGHT GRAY (N4),
COLOR OF SLIGHTLY MEDIUM-GRAINED BASALT-MEDIUM GRAY
(N5);
Phenocrysts: CLINOPYROXENE
ABUNDANCE OF CPX MICROPHENOS IS GREATER THAN
PLAG MICROPHENOS;
PLAGIOCLASE
PLAG MICROPHENOS;
Groundmass : PLAGIOCLASE
MICROLITES;
CLINOPYROXENE
MICROLITES;
MAGNETITE
MICROLITES;
GLASS
Replacement: CHLORITE
PYRITE
CLAY MINERALS
SMEC OR PALAG;
Leg : 61 Top/Bottom Interval(mm): 0/1470 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 693.47
Core: 39 Top of Core Depth (m) : 692.00
Sect: 1 Top of Section Depth(m): 692.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 4 (50-55);
Structure : MASSIVE BASALT, VEINS OF PYRITE+CHORITE+CLAY.MINS
(SMEC,PALAG);
Texture : APHYRIC, UPPER PART IS A CHILLED GLASSY MARGIN,
MICROPHENOS OF CPX>PLAG, GLASS;
Alteration : FRESH TO SLIGHTLY;
Comments : GLASSY MARGIN IS GRAYISH BLACK (N2);
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
PLAGIOCLASE
MICROPHENOS;
Groundmass : MICROLITES IN GNDMASS;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 694.98
Core: 39 Top of Core Depth (m) : 692.00
Sect: 2 Top of Section Depth(m): 693.50
LITHOLOGY: MASSIVE BASALT;
Piece No. : PCE 1 (0-15), 2A (18-30), 2B (30-40), 2C (40-60),
3 (65-78), 4 (81-90), 5A (96-111), 5B (111-121),
6A (125-137), 6B (137-148);
Structure : MASSIVE BASALT, VEINS OF CHLORITE+PYRITE+CLAY
(SMEC>PALAG);
Texture : FROM 0 TO 50(?)CM BASALT IS SLIGHTLY MEDIUM TO
MEDIUM-GRAINED, GRAIN SIZE INCREASES DOWNWARD, FROM
50 TO 150CM BASALT IS MEDIUM-GRAINED;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 39-1;
Leg : 61 Top/Bottom Interval(mm): 0/1460 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 696.46
Core: 39 Top of Core Depth (m) : 692.00
Sect: 3 Top of Section Depth(m): 695.00
LITHOLOGY: MASSIVE BASALT;
Piece No. : PCE 1 (1-8), 2A (10-31), 2B (32-49), 2C (50-60),
3A (67-84), 3B (84-98), 3C (98-115), 3D (115-130),
3E (130-139), 3F (139-146);
Structure : MASSIVE BASALT, VEINS OF CHLORITE+PYRITE+CLAY
(SMEC>PALAG);
Texture : FROM 0 TO 115CM BASALT IS MEDIUM-GRAINED, FROM 115
TO 137CM BASALT IS FINE TO SLIGHTLY FINE-GRAINED,
GRAIN SIZE GRADUALLY DECREASES DOWNWARD, PCE 3F HAS
A CHILLED MARGIN AT 144-145CM;
Comments : SAME UNIT AS SECTION 39-2;
Replacement: CHLORITE
PYRITE
SMECTITE
PALAGONITE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 697.95
Core: 39 Top of Core Depth (m) : 692.00
Sect: 4 Top of Section Depth(m): 696.50
LITHOLOGY: MASSIVE BASALT;
Piece No. : PCE 1 (0-10), 2 (10-20), 3 (22-30), 4 (32-41),
5 (42-51), 6 (54-62), 7 (65-74), 8 (75-84),
9A (85-101), 9B (101-110), 10 (112-120),
11 (121-130), 12 (134-145);
Structure : MASSIVE BASALT, VEINS OF CHLORITE+PYRITE+CLAY.MINS
(SMEC>PALAG);
Texture : FROM 0 TO 9CM IS A GLASSY CHILLED BASALT
MARGIN, FROM 9 TO 64CM BASALT HAS MINOR DOWNWARD
CHANGES OF GRAIN SIZE-FROM FINE TO SLIGHTLY MEDIUM-
GRAINED, FROM 64 TO 66CM (UPPER PART OF PCE 7) IS A
GLASSY CHILLED BASALT MARGIN, FROM 66 TO 93(?)CM
(PCE 7, LOWER PART, TO UPPER PART OF PCE 9A) BASALT
INCREASES FROM FINE TO SLIGHTLY MEDIUM-GRAINED,
FROM 93 TO 120CM (PCES 9A, LOWER PART, TO 10) BASALT
DECREASES FROM SLIGHTLY MEDIUM TO FINE-GRAINED,
FROM 120 TO 150CM (PCES 11+12) UNIT C IS WITHOUT
A CHILLED MARGIN, GRAIN SIZE INCREASES DOWNWARD FROM
FINE TO SLIGHTLY MEDIUM-GRAINED;
Alteration : SLIGHTLY;
Comments : THREE UNITS ARE OBSERVED: UNIT A (0-64), UNIT B
(64-120), UNIT C (120-150);
Replacement: CHLORITE
PYRITE
SMECTITE
PALAGONITE
Leg : 61 Top/Bottom Interval(mm): 0/1200 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 699.20
Core: 39 Top of Core Depth (m) : 692.00
Sect: 5 Top of Section Depth(m): 698.00
LITHOLOGY: MASSIVE BASALT;
Piece No. : PCE 1 (1-8), 2 (10-20), 3A (22-35), 3B (35-42),
3C (42-53), 4 (55-65), 5 (65-72), 6 (75-83),
7 (85-95), 8 (98-120);
Structure : MASSIVE, VEINS OF CHLORITE+PYRITE+CLAY.MINS (SMEC,
PALAG);
Texture : FROM 0 TO 43CM (PCES 1-3B) BASALT INCREASES
IN GRAIN SIZE FROM SLIGHTLY MEDIUM TO MEDIUM, FROM
43 TO 75CM (PCES 3C-5) BASALT GRAIN SIZE DECREASES
FROM MEDIUM TO FINE, FROM 75 TO 95CM (PCES 6+7)
BASALT IS FINE TO SLIGHTLY MEDIUM-GRAINED, FROM
95 TO 120CM (PCES 7+8) BASALT GRAIN SIZE DECREASES
DOWNWARD FROM SLIGHTLY MEDIUM TO FINE;
Alteration : SLIGHTLY;
Comments : THIS UNIT CONTINUED FROM SECTION 39-4, UNIT A (?)
Piece No. : OCCURS FROM (0-75) AND UNIT B (?) OCCURS FROM
(75-120);
Replacement: CHLORITE
PYRITE
SMECTITE
PALAGONITE
Leg : 61 Top/Bottom Interval(mm): 0/ 540 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 702.54
Core: 40 Top of Core Depth (m) : 702.00
Sect: 1 Top of Section Depth(m): 702.00
LITHOLOGY: MASSIVE BASALT;
SAME MINERALOGY AS SECTION 39-1;
Piece No. : PCES 1 (0-4), 2 (6-9), 3A (13-23), 3B (25-30),
4A (31-45), 4B (45-50), 4C (50-53);
Structure : MASSIVE BASALT;
Texture : INTERVAL (0-19) BASALT VARIES FROM FINE
TO SLIGHTLY MEDIUM-GRAINED, INTERVAL (19-30)
(PCES 3A+3B) BASALT IS MEDIUM-GRAINED, INTERVAL
(30-54) (PCES 4A-4C) BASALT VARIES FROM MEDIUM-
GRAINED TO A CHILLED MARGIN (BOTTOM 2CM OF PCE 4C);
Alteration : SLIGHTLY;
Comments : TWO UNITS OCCUR IN THIS SECTION, UNIT A IS 0 TO
54CM;
Leg : 61 Top/Bottom Interval(mm): 540/ 860 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 702.86
Core: 40 Top of Core Depth (m) : 702.00
Sect: 1 Top of Section Depth(m): 702.54
LITHOLOGY: MASSIVE BASALT;
SAME LITHOLOGY AS SECTION 39-1;
Piece No. : PCES 5 (55-86);
Structure : MASSIVE BASALT;
Texture : INTERVAL (55-64) BASALT HAS A CHILLED MARGIN
(55-57) AND GRAIN SIZE INCREASES DOWNWARD TO SLIGHTL
MEDIUM, INTERVAL (64-71) BASALT IS SLIGHTLY MEDIUM-
GRAINED, INTERVAL (71-86) BASALT VARIES DOWNWARD
FROM SLIGHTLY MEDIUM-GRAINED TO A CHILLED MARGIN
(84-86);
Alteration : SLIGHTLY;
Comments : TWO UNITS OCCUR IN THIS SECTION, UNIT B IS 54 TO
86CM;
Leg : 61 Top/Bottom Interval(mm): 860/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 703.50
Core: 40 Top of Core Depth (m) : 702.00
Sect: 1 Top of Section Depth(m): 702.86
LITHOLOGY: SEDIMENT;
Leg : 61 Top/Bottom Interval(mm): 0/ 220 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 703.72
Core: 40 Top of Core Depth (m) : 702.00
Sect: 2 Top of Section Depth(m): 703.50
LITHOLOGY: VOLCANICLASTICS;
Leg : 61 Top/Bottom Interval(mm): 220/ 550 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 704.05
Core: 40 Top of Core Depth (m) : 702.00
Sect: 2 Top of Section Depth(m): 703.72
LITHOLOGY: MASSIVE BASALT;
SAME BASALT AS MENTIONED IN SECTION 40-1;
Piece No. : PCES 1A (24-34), 1B (34-54);
Structure : MASSIVE BASALT;
Texture : CHILLED MARGIN AT 24-26CM, GRAIN SIZE INCREASES
DOWNWARD AND BECOMES MEDIUM-GRAINED AT 55CM;
Alteration : SLIGHTLY
Comments : FROM 24 TO 55CM IS A SINGLE BASALT UNIT;
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 712.40
Core: 41 Top of Core Depth (m) : 711.00
Sect: 1 Top of Section Depth(m): 711.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : 5A (40-58), 5B (55-107), 5C (107-137);
Structure : MASSIVE BASALT SILL, VEINS ARE FILLED WITH CALCITE+
CHLORITE+PYRITE+SMEC;
Texture : MICROPHYRIC, DOLERITE WITH EQUAL AMOUNTS OF PLAG AND
CPX, MICROPHENO GRAIN SIZE VARIES MEDIUM TO SLIGHTLY
COARSE-GRADUALLY INCREASING DOWNWARD, DOLERITE IS
INTERGRANULAR TO SUBOPHITIC;
Alteration : SLIGHTLY;
Comments : BASALT IS MEDIUM GRAY (N5);
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS, THE RATIO PLAG:CPX IS APPROXIMATELY
1;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
TITANOMAGNETITE
MICROLITES;
Leg : 61 Top/Bottom Interval(mm): 0/1280 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 713.78
Core: 41 Top of Core Depth (m) : 711.00
Sect: 2 Top of Section Depth(m): 712.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS SECTION 41-1;
Piece No. : PCE 1A (1-43), 1B (45-80), 1C (80-128);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CALCITE+CHLORITE+PYRITE+SMEC BUT CHLORITE+PYRITE
VEINS ARE PREVAILING, HOMOGENEOUS;
Texture : SLIGHTLY COARSE-GRAINED, SUBOPHITIC;
Alteration : SLIGHTLY;
Comments : BASALT IS MEDIUM GRAY (N5);
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS, THE RATIO PLAG:CPX IS APPROXIMATELY
1;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
TITANOMAGNETITE
MICROLITES;
Replacement: CALCITE
CHLORITE
PYRITE
SMECTITE
Leg : 61 Top/Bottom Interval(mm): 0/1340 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 715.34
Core: 41 Top of Core Depth (m) : 711.00
Sect: 3 Top of Section Depth(m): 714.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS SECTION 41-1;
Piece No. : PCE 1A (1-60), 1B (60-83), 1C (83-115),
1D (115-132);
Structure : MASSIVE DOLERITE SILL, HOMOGENEOUS, VEINS ARE FILLED
WITH CALCITE+CHLORITE+PYRITE+SMEC, CHLORITE+PYRITE
VEINS ARE PREVALENT;
Texture : SLIGHTLY COARSE-GRAINED, SUBOPHITIC;
Alteration : SLIGHTLY;
Comments : BASALT IS MEDIUM GRAY (N5), DOLERITE IS THE SAME
UNIT AS SECTION 41-1;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS;
Replacement: CALCITE
CHLORITE
PYRITE
SMECTITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 717.00
Core: 41 Top of Core Depth (m) : 711.00
Sect: 4 Top of Section Depth(m): 715.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS SECTION 41-1;
Piece No. : PCE 1A (1-60), 1B (59-128), 1C (129-150);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CALCITE+CHLORITE+PYRITE+SMEC, CHLORITE+PYRITE ARE
PREVALENT;
Texture : MICROPHYRIC, DOLERITE IS SPOTTED BY ALTERATION TO
CLAY, SUBOPHITIC TO INTERGRANULAR, GRAIN SIZE
DECREASES DOWNWARD FROM SLIGHTLY COARSE TO MEDIUM,
MICROPHENOS OF PLAG ARE LESS COMMON IN THE UPPER
PART OF THE SECTION THAN IN THE LOWER PART;
Alteration : MED
ALTERATION TO CLAY SPOTS DOLERITE;
Comments : SAME UNIT AS 41-1;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS;
Replacement: CALCITE
CHLORITE
PYRITE
SMECTITE
Leg : 61 Top/Bottom Interval(mm): 0/ 900 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 717.90
Core: 41 Top of Core Depth (m) : 711.00
Sect: 5 Top of Section Depth(m): 717.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS SECTION 41-1;
Piece No. : PCE 1A (1-22), 1B (22-42), 1C (42-50), 1D (50-61),
1E (61-93);
Structure : MASSIVE DOLERITE SILL, HOMOGENEOUS;
Texture : MEDIUM-GRAINED DOLERITE, INTERGRANULAR TO
INTERSERTAL;
Alteration : SLIGHTLY;
Comments : BASALT IS MEDIUM GRAY (N5);
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS;
Replacement: CALCITE
CHLORITE
PYRITE
SMECTITE
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 719.90
Core: 41 Top of Core Depth (m) : 711.00
Sect: 6 Top of Section Depth(m): 718.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS SECTION 41-1;
Piece No. : PCE 1A (2-35), 1B (35-121), 1C (122-140);
Structure : MASSIVE DOLERITE SILL, WITH VEINS, VEINS ARE FILLED
WITH CALCITE+CHLORITE+PYRITE+SMEC;
Texture : INTERVAL (0-121) BASALT GRAIN SIZE DECREASES
DOWNWARD FROM SLIGHTLY COARSE TO MEDIUM, SUBOPHITIC
TO INTERGRANULAR;
Alteration : MOD TO SLIGHTLY
PCES 1A+1B;
EXT
FROM 120 TO 140CM (PCE 1C) BASALT HAS A BADLY
ALTERED SURFACE AND THUS THE BASALT'S GRAIN SIZE
IS NOT APPARENT;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS;
Replacement: CALCITE
CHLORITE
PYRITE
SMECTITE
Leg : 61 Top/Bottom Interval(mm): 0/1080 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 721.08
Core: 41 Top of Core Depth (m) : 711.00
Sect: 7 Top of Section Depth(m): 720.00
LITHOLOGY: APHYRIC TO CPX SLIGHTLY PHYRIC BASALT;
MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1A (1-19), 1B (16-31), 1C (31-40), 1D (41-56),
1E (56-86), 1F (90-100);
Structure : MASSIVE BASALT SILL WITH VEINS FILLED WITH CALCITE+
CHLORITE+PYRITE+SMEC, CHLORITE+PYRITE VEINS PREVAIL;
Texture : APHYRIC TO SLIGHTLY MICROPHYRIC, INTERVAL (0-105)
DOLERITE IS MEDIUM TO COARSE-GRAINED (DECREASING
DOWNWARD), ALTERATION SPOTS;
Alteration : SLIGHTLY
FEW SPOTS OF ALTERATION TO CLAY;
Comments : CONTACT OF BASALT AND SEDIMENT AT 105CM, BASALT IS
MEDIUM GRAY (N5);
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
Replacement: CALCITE
CHLORITE
PYRITE
SMECTITE
Leg : 61 Top/Bottom Interval(mm): 1080/1500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 721.50
Core: 41 Top of Core Depth (m) : 711.00
Sect: 7 Top of Section Depth(m): 721.08
LITHOLOGY: SEDIMENT;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 730.48
Core: 44 Top of Core Depth (m) : 729.00
Sect: 1 Top of Section Depth(m): 729.00
LITHOLOGY: CPX MOD PHYRIC BASALT;
Piece No. : PCE 1 (9-20), 2 (25-34), 3 (36-65), 4 (66-81),
5 (85-95), 6 (100-105), 7 (109-120), 8 (124-148);
Structure : THESE THREE BASALT UNITS MAY BE SILLS WITH
CRENULATED MARGINS OR PILLOWS;
Texture : MOD PHYRIC, POSSIBLE CRENULATED MARGINS, UNIT 1
(9-34) IS GLASSY (9-10) AND FINE-GRAINED (10-34),
UNIT 2 (35-65) IS GLASSY (33-34) AND (63-64) AND
FINE-GRAINED (34-63), UNIT 3 (66-148) IS GLASSY
(66-68) AND (146-148) AND FINE-GRAINED (68-146),
VARIABLY GLASSY AND HOLOXTLN MATRIX;
Comments : THREE BASALT UNITS, UNIT 1 (9-34)+UNIT 2 (35-65)+
UNIT 3 (66-148);
Alteration : CLAYEY ALTERED SPOTS;
Vesicles :
Location: Filling: CHALC,QTZ
Shape : SPHERULE
NEAR THE GLASSY MARGINS ARE DRUSY AND VUGGY
CHALC-QTZ IN SMALL SPHERULES;
Phenocrysts: CLINOPYROXENE ( 3-4%)
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
Replacement: CHALCEDONY
QUARTZ
CHLORITE
Minerals Replaced: GLASS
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 731.95
Core: 44 Top of Core Depth (m) : 729.00
Sect: 2 Top of Section Depth(m): 730.50
LITHOLOGY: CPX MOD PHYRIC BASALT;
SAME AS SECTION 1;
Piece No. : PCE 1 (2-9), 2 (13-18), 3 (22-30), 4 (32-36),
5 (41-50), 6 (54-80), 7 (81-98), 8 (103-110),
9 (114-122), 10 (126-131), 11 (135-145);
Structure : THESE BASALT UNITS MAY BE SILLS WITH CRENULATED
MARGINS OR PILLOWS;
Texture : MOD PHYRIC, POSSIBLE CRENULATED MARGINS, UNIT 4
(0-80) IS GLASSY (0-37) AND FINE-GRAINED (37-80),
UNIT 5 (80-150(?)) IS GLASSY (81-83) AND 2CM OF ONE
OF THE PCES NEAR THE BOTTOM OF THE SECTION AND
FINE-GRAINED (83-135(?)) AND FRAGMENTS TO 150CM;
Comments : TWO UNITS PRESENT-INTERVALS (0-80) AND (80-150);
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 733.40
Core: 44 Top of Core Depth (m) : 729.00
Sect: 3 Top of Section Depth(m): 732.00
LITHOLOGY: PLAG-PYX PHYRIC BASALT;
SAME AS SECTIONS 1+2;
Piece No. : PCE 1 (0-10), 2 (13-16), 3 (20-23), 4 (25-35),
5 (40-45), 6 (50-61), 7 (73-75), 8 (80-140);
Structure : THE BASALT (UNIT 6) MAY BE A SILL WITH CRENULATED
MARGINS OR PILLOWS;
Texture : PHYRIC, POSSIBLE CRENULATED MARGINS, PCES OF GLASSY
BASALT OCCURS IN INTERVAL (0-14), FINE-GRAINED IN
INTERVAL (14-76);
Comments : BELOW 76CM ALL PCES (PCE 8) ARE CORE CATCHER SAMPLES
WHOSE ORIENTATION AND STRATIGRAPHIC POSITION ARE
UNKNOWN;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 734.50
Core: 45 Top of Core Depth (m) : 733.00
Sect: 1 Top of Section Depth(m): 733.00
LITHOLOGY: PLAG-PYX SLIGHTLY PHYRIC BASALT;
Piece No. : PCES 1A (0-18), 1B (16-30), 1C (30-40),
3C (90-103), 3D (104-120), 4 (122-140), 5 (141-148);
Structure : BASALT SILL CUT BY CALCITE+CHLORITE+CLAY+PYRITE
VEINS;
Texture : SLIGHTLY PHYRIC, FINE-GRAINED, BASALT WITH
DISSEMINATED VARIOLITIC (GLASSY) SPOTS;
Alteration : EXT;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
Replacement: CALCITE
CHLORITE
CLAY MINERALS
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 734.50
Core: 45 Top of Core Depth (m) : 733.00
Sect: 1 Top of Section Depth(m): 733.00
LITHOLOGY: PLAG-PYX PHYRIC BASALT;
Piece No. : PCE 2 (41-45), 3A (47-60), 3B (60-90);
Structure : BASALT SILL CUT BY CALCITE+CHLORITE+CLAY+PYRITE
VEINS, FROM 49 TO 51CM THERE IS A VEIN OF COARSE
(3-4MM) CRYSTALS LIKE TRANSPARENT PALE-GREENISH
ZEOL (PHILLIPSITE);
Texture : PHYRIC, MORE XTLN PHYRIC THAN REST OF SECTION,
COARSER GRAINED, NO GLASSY SPOTS;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
Replacement: CALCITE
CHLORITE
CLAY MINERALS
ZEOLITE
PROBABLY PHILLIPSITE;
Leg : 61 Top/Bottom Interval(mm): 0/1320 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 735.82
Core: 45 Top of Core Depth (m) : 733.00
Sect: 2 Top of Section Depth(m): 734.50
LITHOLOGY: BASALT SILL;
IDENTICAL TO INTERVAL (0-40) OF SECTION 45-1;
Piece No. : PCE 1 (0-7), 2A (10-17), 2B (16-30), 2C (30-40),
3 (92-110), 4 (112-131);
Structure : BASALT SILL, IN GENERAL VEINS ARE FILLED WITH
CALCITE+CHLORITE+CLAY+PYRITE;
Texture : SLIGHTLY PHYRIC, FINE-GRAINED;
Alteration : EXT;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
Replacement: CALCITE
CHLORITE
CLAY MINERALS
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1320 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 735.82
Core: 45 Top of Core Depth (m) : 733.00
Sect: 2 Top of Section Depth(m): 734.50
LITHOLOGY: PLAG-CPX PHYRIC BASALT;
IDENTICAL TO INTERVAL (40-92) OF SECTION 45-1;
Piece No. : PCE 2D (40-51), 2E (51-70), 2F (70-90);
Structure : BASALT SILL, IN GENERAL VEINS ARE FILLED WITH
CALCITE+CHLORITE+CLAY+PYRITE;
Texture : PHYRIC, MORE COARSE-GRAINED THAN REST OF SECTION;
Alteration : EXT;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
Replacement: CALCITE
CHLORITE
CLAY MINERALS
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1110 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 737.11
Core: 45 Top of Core Depth (m) : 733.00
Sect: 3 Top of Section Depth(m): 736.00
LITHOLOGY: BASALT SILL;
Piece No. : PCE 1A (0-11), 1B (12-20), 1C (20-35), 1D (35-60),
2 (61-79), 3A (80-100), 3B (100-110);
Structure : BASALT SILL, VEINS ARE FILLED WITH CALCITE+CHLORITE+
CLAY+PYRITE;
Texture : SLIGHTLY PHYRIC, MEDIUM-GRAINED, NO GLASSY SPOTS,
MORE XTLN THAN THE MIDDLE OF THE PREVIOUS SECTION;
Phenocrysts: OLIVINE
PLAGIOCLASE
Replacement: CALCITE
CHLORITE
CLAY
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 30 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 738.03
Core: 46 Top of Core Depth (m) : 738.00
Sect: 1 Top of Section Depth(m): 738.00
LITHOLOGY: SEDIMENT;
Leg : 61 Top/Bottom Interval(mm): 30/1310 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 739.31
Core: 46 Top of Core Depth (m) : 738.00
Sect: 1 Top of Section Depth(m): 738.03
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (5-20), 1B (21-56), 1C (55-66), 1D (67-80),
1E (80-93), 1G (106-131);
Structure : MASSIVE DOLERITE SILL WITH VEINS OF CHLORITE+PYRITE;
Texture : FROM 5 TO 67CM BASALT VARIES FROM FINE TO SLIGHTLY
MEDIUM-GRAINED AND BASALT IS HYALOPILITIC TO
INTERSERTAL, A DISTINCT UPPER CHILLED MARGIN WAS NOT
FOUND, FROM 67 TO 131CM BASALT IS MEDIUM-GRAINED AND
INTERSERTAL TO INTERGRANULAR AND THERE IS NO GLASS A
IN THE TOP INTERVAL;
Alteration : MOD TO EXT
MICROPHENOS OFTEN ALTERED, GNDMASS ALSO APPEARS
TO BE BADLY ALTERED;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
Replacement: CLAY MINERALS
Minerals Replaced: CPX
CHLORITE
PYRITE
Comments : COLOR OF BASALT PCES 1A-1C IS MEDIUM LIGHT GRAY
(N6), COLOR OF BASALT PCES 1D-1G IS MEDIUM GRAY
(N5);
Leg : 61 Top/Bottom Interval(mm): 0/1330 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 740.83
Core: 46 Top of Core Depth (m) : 738.00
Sect: 2 Top of Section Depth(m): 739.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME CONSTITUENT MINERALS AS SECTION 1;
Piece No. : PCE 1A (0-6), 1B (7-24), 2A (25-41), 2B (41-51),
2C (51-56), 3A (58-80), 3B (80-95), 3C (89-102),
3D (101-113), 4 (119-133);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE+PYRITE;
Texture : SLIGHTLY MEDIUM TO MEDIUM-GRAINED, INTERSERTAL TO
INTERGRANULAR;
Alteration : MOD TO EXT;
Comments : SAME UNIT AS SECTION 46-1;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
Replacement: CHLORITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1250 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 742.25
Core: 46 Top of Core Depth (m) : 738.00
Sect: 3 Top of Section Depth(m): 741.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME CONSTITUENT MINERALS AS SECTION 1;
Piece No. : PCE 1 (1-28), 2A (31-51), 2B (52-70), 2C (70-78),
2D (78-95), 2E (95-125);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE+PYRITE;
Texture : SLIGHTLY MEDIUM TO MEDIUM-GRAINED, INTERSERTAL TO
INTERGRANULAR;
Alteration : MOD;
Comments : SAME UNIT AS SECTION 46-2;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
Replacement: CHLORITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 710 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 743.21
Core: 46 Top of Core Depth (m) : 738.00
Sect: 4 Top of Section Depth(m): 742.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME CONSTITUENT MINERALS AS 46-1;
Piece No. : PCE 1A (2-22), 1B (24-71);
Structure : MASSIVE DOLERITE SILL, PYRITE+CHLORITE VEINS;
Texture : MICROPHYRIC, SLIGHTLY MEDIUM TO MEDIUM-GRAINED,
INTERSERTAL TO INTERGRANULAR;
Alteration : MOD;
Comments : SAME UNIT AS 46-3;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
Replacement: PYRITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 710/1400 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 743.90
Core: 46 Top of Core Depth (m) : 738.00
Sect: 4 Top of Section Depth(m): 743.21
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 2A (71-90), 2B (110-140);
Structure : MASSIVE DOLERITE SILL, PYRITE+CHLORITE VEINS;
Texture : MEDIUM TO SLIGHTLY COARSE-GRAINED, INTERGRANULAR TO
SUBOPHITIC;
Alteration : MOD;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
MAGNETITE
MAGN ID CERTAIN;
Groundmass : CLINOPYROXENE
MICROLITES;
PLAGIOCLASE
MICROLITES;
MAGNETITE
MICROLITES;
Replacement: PYRITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1300 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 745.30
Core: 46 Top of Core Depth (m) : 738.00
Sect: 5 Top of Section Depth(m): 744.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME MINERAL CONSTITUENTS AS SECTIONS 46-1 AND 46-4;
Piece No. : PCE 1 (1-41), 2 (45-65), 3 (70-83), 4 (90-97),
5 (100-120), 6 (122-130);
Structure : MASSIVE DOLERITE SILL, VEINS OF PYRITE+CHLORITE;
Texture : MICROPHYRIC, GRAIN SIZE DECREASES DOWNWARD FROM
SLIGHTLY COARSE TO FINE-GRAINED;
Alteration : MOD;
Comments : SAME UNIT AS 46-4;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
Replacement: PYRITE
CHLORITE
Structure : PCE 6 MAY BE NEAR A CONTACT WITH SEDIMENT;
Texture : CHILLED MARGIN IS NOT FOUND IN PCE 6;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 748.50
Core: 47 Top of Core Depth (m) : 747.00
Sect: 1 Top of Section Depth(m): 747.00
LITHOLOGY: CPX MOD PHYRIC BASALT;
Piece No. : PCE 1 (0-2), 2 (4-11), 3 (15-20), 4 (24-30),
5 (32-39), 6 (41-45), 7 (46-65), 8 (66-92),
9 (94-99), 10 (101-105), 11 (107-112), 12 (115-149);
Structure : ABUNDANT VEINS AND CRACKS ARE FILLED WITH PYRITE+
CHLORITE+CLAY;
Texture : MOD PHYRIC, GLASSY MARGINS ARE UP TO 13MM THICK AND
VERY ABUNDANT, TEXTURES OF THE INTERIOR CRYSTALLINE
PORTION IS SPOTTED AND HETEROGENEOUS;
LITHOLOGY: SLIGHTLY;
Phenocrysts: CLINOPYROXENE ( 3-4%)
Size(mm): 0.2-0.4
Groundmass : ZEOLITE
ZEOLITES (PHILLIPSITE) ARE PREFERENTIALLY
ASSOCIATED WITH GLASS, GNDMASS VARIES FROM GLASSY+
VARIOLITIC+EQUIGRANULAR;
Alteration : SOME CLAY ALTERATION IS VISIBLE AS SPOTS OR CUT
SURFACES;
Replacement: CLAY
Leg : 61 Top/Bottom Interval(mm): 0/1420 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 749.92
Core: 47 Top of Core Depth (m) : 747.00
Sect: 2 Top of Section Depth(m): 748.50
LITHOLOGY: CPX MOD PHYRIC BASALT;
SAME AS PREVIOUS SECTION;
Piece No. : PCE 1 (2-30), 2 (34-42), 3 (45-131), 4 (135-142);
Structure : ABUNDANT VEINS FILLED WITH PYRITE+CHLORITE+CLAY;
Texture : MOD PHYRIC, GNDMASS VARIES FROM GLASSY TO VARIOLITIC
TO EQUIGRANULAR, GLASSY MARGINS ARE UP TO 13MM THICK
BUT ARE LESS ABUNDANT THAN SECTION 47-2, TEXTURES OF
THE INTERIOR CRYSTALLINE PORTION IS SPOTTED AND
HETEROGENEOUS, FROM 45 TO 114CM GRAIN SIZE
INCREASES, PCE 4 IS FINER-GRAINED THAN ABOVE;
Alteration : SLIGHTLY
SOME CLAY ALTERATION IS VISIBLE AS SPOTS ON CUT
SURFACES;
Phenocrysts: CLINOPYROXENE ( 3-4%)
Size(mm): 0.2-0.4
Replacement: PYRITE
CHLORITE
CLAY MINERALS
ZEOLITE
PHILLIPSITE, ZEOLITES ARE PREFERENTIALLY
ASSOCIATED WITH GLASS;
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 751.49
Core: 47 Top of Core Depth (m) : 747.00
Sect: 3 Top of Section Depth(m): 750.00
LITHOLOGY: CPX MOD PHYRIC BASALT;
SAME TEXTURE AND ALTERATION AND GENERAL ASPECT AS
PREVIOUS TWO SECTIONS;
Piece No. : PCE 1 (0-5), 2 (5-10), 3 (11-37), 4 (40-70),
5 (75-88), 6 (91-99), 7 (101-122), 8 (124-149);
Structure : VEINS FILLED WITH PYRITE+CHLORITE+CLAY;
Texture : MOD PHYRIC, GLASSY MARGINS ARE TO 13MM THICK,
TEXTURES OF THE INTERIOR CRYSTALLINE PORTION IS
SPOTTED AND HETEROGENEOUS, FROM 77 TO 100CM BASALT
BECOMES MORE COARSE-GRAINED, FROM 100 TO 120CM
GRAIN SIZE DECREASES;
Alteration : SLIGHTLY
SOME CLAY ALTERATION IS VISIBLE AS SPOTS ON CUT
SURFACES;
Phenocrysts: CLINOPYROXENE ( 3-4%)
Size(mm): 0.2-0.4
Replacement: PYRITE
CHLORITE
CLAY MINERALS
ZEOLITE
PHILLIPSITE, ZEOLITES ARE PREFERENTIALLY
ASSOCIATED WITH GLASS, ZEOLITE FRAGMENTS OCCUR
AT 5-10CM (PCE 2);
Groundmass : GLASSY TO VARIOLITIC TO EQUIGRANULAR;
Leg : 61 Top/Bottom Interval(mm): 0/ 140 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 756.14
Core: 48 Top of Core Depth (m) : 756.00
Sect: 1 Top of Section Depth(m): 756.00
LITHOLOGY: PLAG-CPX SLIGHTLY PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCE 1A (0-6), 1B (7-14);
Structure : PILLOW BASALT WITH PYRITE+CHLORITE+CLAY VEINS PLUS
TRANSPARENT AND WHITE ZEOLITE VEINS;
Texture : SLIGHTLY PHYRIC, GLASSY RIM NEAR THE BOTTOM OF THE
UNIT;
Alteration : FRESH TO EXT
PCE 1A IS EXT ALTERED AND PCE 1B IS FRESH;
Comments : UNIT 1;
Phenocrysts: CLINOPYROXENE
Replacement: PYRITE
CHLORITE
ZEOLITE
Vesicles : VESICULAR;
Leg : 61 Top/Bottom Interval(mm): 170/ 670 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 756.67
Core: 48 Top of Core Depth (m) : 756.00
Sect: 1 Top of Section Depth(m): 756.17
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 2A (12-25), 2B (25-30), 2C (30-35), 2D (35-43),
PCE 2E (42-66);
Structure : PILLOW BASALT WITH PYRITE+CHLORITE+CLAY VEINS PLUS
TRANSPARENT AND WHITE ZEOLITE VEINS;
Texture : FROM 17 TO 27CM BASALT IS APHANITIC AND FROM 27 TO
64CM BASALT IS APHANITIC WITH GLASSY SPOTS, FROM 44
TO 58CM BASALT IS MORE COARSE-GRAINED AND WITHOUT
SPOTS, INTERVAL (58-67) IS APHANITIC WITH A LOWER
LOWER GLASSY MARGIN;
Alteration : EXT;
Comments : UNIT 2;
Vesicles : INTERVAL (17-27) IS VESICULAR;
Replacement: PYRITE
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 680/1160 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 757.16
Core: 48 Top of Core Depth (m) : 756.00
Sect: 1 Top of Section Depth(m): 756.68
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 3A (68-97), 3B (97-105), 3C (105-116);
Structure : PILLOW BASALT WITH PYRITE+CHLORITE+CLAY VEINS PLUS
TRANSPARENT AND WHITE ZEOLITE VEINS;
Texture : INTERVALS (79-85) AND (114-116) ARE APHANITIC,
INTERVAL (85-114) IS MORE COARSE-GRAINED;
Alteration : FRESH TO ALMOST COMPLETELY
NTERVAL (75-95) IS ALMOST COMPLETELY ALTERED;
Comments : UNIT 3, INTERVAL (68-79) WAS NOT DESCRIBED;
Replacement: PYRITE
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 1230/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 757.50
Core: 48 Top of Core Depth (m) : 756.00
Sect: 1 Top of Section Depth(m): 757.23
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 4A (125-131), 4B (130-140), 4C (140-147),
4D (147-150);
Structure : PILLOW BASALT WITH PYRITE+CHLORITE+CLAY VEINS PLUS
TRANSPARENT AND WHITE ZEOLITE VEINS;
Texture : BASALT IS APHANITIC NEAR THE TOP (16CM) AND BOTTOM
(2CM), COARSE-GRAINED NEAR THE MIDDLE;
Alteration : FRESH;
Comments : UNIT 4;
Replacement: PYRITE
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 759.00
Core: 48 Top of Core Depth (m) : 756.00
Sect: 2 Top of Section Depth(m): 757.50
LITHOLOGY: PILLOW BASALT;
SAME BASALTS AS ABOVE SECTION;
Piece No. : PCE 1A (0-5), 1B (6-15), 1C (15-25), 1D (25-31),
1E (32-37), 1F (38-46), 2A (51-56), 2B (56-65),
2C (65-75), 2D (75-80), 2E (81-90), 2F (90-100),
2G (101-105), 3A (107-115), 3B (115-125),
3C (125-140), 3D (145-150);
Structure : CALCITE+PYRITE+CLAY VEINS PLUS TRANSPARENT AND WHITE
ZEOLITE VEINS;
Texture : GLASSY MARGINS WITH 4 BASALT UNITS, INTERVAL(125-150
IS MEDIUM-GRAINED;
Comments : 3 BASALT UNITS, UNIT 1 OCCURS FROM 0-49CM, UNIT 2
OCCURS FROM 50-104CM, UNIT 3 OCCURS FROM 116-150CM;
Replacement: CALCITE ( RARE%)
CHLORITE
CLAY MINERALS
ZEOLITE
TRANSPARENT AND WHITE;
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 760.49
Core: 48 Top of Core Depth (m) : 756.00
Sect: 3 Top of Section Depth(m): 759.00
LITHOLOGY: PILLOW BASALT;
SAME PILLOW BASALT AS ABOVE SECTION;
Piece No. : PCE 1A (0-25), 1B (26-29), 2A (31-40), 2B (40-50),
2C (50-56), 2D (56-63), 2E (63-74), 2F (73-79),
3A (81-85), 3B (86-97), 3C (97-109), 3D (106-115),
4A (118-125), 4B (125-130), 4C (131-140),
4D (140-149);
Structure : PILLOW BASALT WITH CALCITE+CHLORITE+CLAY VEINS PLUS
TRANSPARENT AND WHITE ZEOLITE VEINS, INTERVAL
(135-137) VEINS OF DRUSE OF FIBROUS-RADIATING
ZEOLITE ARE PRESENT;
Texture : 3 BASALT UNITS WITH GLASSY MARGINS, INTERVAL
(115-117) IS APHANITIC;
Alteration : EXT
PCES 1A+2A+2B+2D+3B+4A-4D;
Comments : 3 BASALT UNITS, INTERVAL (0-30) IS THE SAME UNIT (4)
AS THE PREVIOUS SECTION (48-2), UNIT 1 INTERVAL
(30-80), UNIT 2 INTERVAL (80-118), UNIT 3 INTERVAL
(118-150);
Replacement: CALCITE ( RARE%)
CHLORITE
CLAY MINERALS
ZEOLITE
TRANSPARENT AND WHITE;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 762.00
Core: 48 Top of Core Depth (m) : 756.00
Sect: 4 Top of Section Depth(m): 760.50
LITHOLOGY: PILLOW BASALT;
SAME PILLOW BASALT AS ABOVE SECTION;
Piece No. : PCE 1A (0-10), 2A (11-18), 2B (18-26), 2C (26-39),
2D (40-56), 2E (56-70), 2F (70-75), 3A (76-96),
3B (96-100), 3C (100-110), 4A (110-121),
4B (121-126), 4C (126-135), 4D (135-150);
Structure : PILLOW BASALT, CALCITE(RARE)+CHLORITE+CLAY VEINS,
INTERVAL (101-102) THICK VEIN OF FIBROUS-RADIATED
PINK ZEOLITE WITH CUBIC PYRITE;
Texture : SLIGHTLY PHYRIC, 3 NEW BASALT UNITS WITH GLASSY
MARGINS;
Alteration : PCES 2A-2D+3A+4A ARE ALTERED;
Comments : INTERVAL (0-10) IS BOTTOM OF PREVIOUS UNIT FROM
SECTION 48-4, 4 NEW BASALT UNITS, UNIT 1 INTERVAL
(10-74), UNIT 2 INTERVAL (76-109), UNIT 3 INTERVAL
(111-150);
Replacement: CALCITE ( RARE%)
CHLORITE
CLAY MINERALS
ZEOLITE
TRANSPARENT AND WHITE, ALSO FIBROUS RADIATED PINK;
PYRITE
CUBIC;
Leg : 61 Top/Bottom Interval(mm): 0/1100 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 763.10
Core: 48 Top of Core Depth (m) : 756.00
Sect: 5 Top of Section Depth(m): 762.00
LITHOLOGY: PILLOW BASALT;
SIMILAR TO ABOVE SECTIONS;
Piece No. : PCE 1A (0-14), 1B (15-20), 1C (20-26), 1D (27-35),
1E (35-42), 1F (43-52), 2 (61-71), 3 (73-79),
4 (80-86), 5 (88-95), 6 (96-99), 7 (99-100),
8 (101-105), 9 (107-110);
Structure : PILLOW BASALT WITH CALCITE(RARE)+CHLORITE+CLAY VEINS
AND ZEOLITE VEINS;
Texture : SLIGHTLY PHYRIC, INTERVAL (60-110) (CORE CATCHER)
IS APHANITIC WITH GLASSY PILLOW AND FINE-GRAINED;
Comments : INTERVAL (0-60) IS THE BOTTOM OF THE UNIT FROM THE
PREVIOUS SECTION (48-4), PCES IN INTERVAL (60-110)
(CORE CATCHER) DO NOT HAVE KNOWN ORIENTATIONS;
Replacement: CALCITE ( RARE%)
CHLORITE
CLAY MINERALS
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 766.49
Core: 49 Top of Core Depth (m) : 765.00
Sect: 1 Top of Section Depth(m): 765.00
LITHOLOGY: APHYRIC TO CPX-PLAG MICROPHYRIC BASALT;
Piece No. : PCE 1 (0-5), 2 (5-10), 3 (11-18), 4 (20-26),
5 (29-34), 6 (36-41), 7 (45-54), 8A (55-60),
8B (60-65), 8C (65-75), 8D (75-89), 8E (89-95),
8F (95-104), 8G (103-110), 8H (109-120)
8I (122-149);
Structure : VEINS FILLED WITH CHLORITE+PYRITE;
Texture : APHYRIC TO MICROPHYRIC, HYALOPILITIC-ESPECIALLY
LOWER PART OF PCE 7, AT INTERVAL (56-58) IS A
MEDIUM LIGHT GRAY (N6) CHILLED MARGIN, INTERVAL
(56-68) IS FINE-GRAINED, INTERVAL (68-103) IS FINE-
GRAINED, INTERVAL (103-150) IS MEDIUM-GRAINED AND
INTERSERTAL TO INTERGRANULAR;
Comments : PCES 1-7 WERE NEAR CONTACT WITH SEDIMENT OR LOWER
IGNEOUS ROCK, AT INTERVAL (56-68) BASALT IS MEDIUM
LIGHT GRAY (N6), AT INTERVAL (68-150) BASALT COLOR
IS MEDIUM DARK GRAY (N4);
Alteration : SLIGHTLY;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS, AT INTERVAL (0-54) CPX>PLAG IN
ABUNDANCE, AT INTERVAL (68-103) PLAG>CPX IN
ABUNDANCE;
Replacement: CHLORITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1410 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 767.91
Core: 49 Top of Core Depth (m) : 765.00
Sect: 2 Top of Section Depth(m): 766.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-17), 1B (16-30), 1C (31-40), 1D (40-48),
2 (50-62), 3 (64-73), 4 (75-82), 5A (84-102),
5B (104-120), 6 (127-140);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE+PYRITE;
Texture : SLIGHTLY MEDIUM TO MEDIUM-GRAINED, INTERSERTAL TO
INTERGRANULAR;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS IN THE LOWER PART OF SECTION 49-1;
Phenocrysts: PLAGIOCLASE
MICROPHENOS;
CLINOPYROXENE
MICROPHENOS, AT INTERVAL (0-74) CPX ABOUT EQUAL TO
PLAG IN ABUNDANCE, AT INTERVAL (74-141) PLAG>CPX
IN ABUNDANCE;
Leg : 61 Top/Bottom Interval(mm): 0/1420 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 769.42
Core: 49 Top of Core Depth (m) : 765.00
Sect: 3 Top of Section Depth(m): 768.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (2-20), 2A (22-27), 2B (28-40), 3 (40-55),
4 (55-79), 5A (80-95), 5B (95-119), 6 (124-140);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE+PYRITE;
Texture : DOLERITE, SLIGHTLY MEDIUM TO MEDIUM-GRAINED,
INTERGRANULAR TO INTERSERTAL;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS IN SECTIONS 49-1 AND 49-2;
Replacement: CHLORITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 600 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 770.10
Core: 49 Top of Core Depth (m) : 765.00
Sect: 4 Top of Section Depth(m): 769.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (2-20), 2A (24-37), 2B (37-47), 3 (51-58);
Structure : MASSIVE DOLERITE SILL;
Texture : DOLERITE, SLIGHTLY MEDIUM TO MEDIUM-GRAINED,
INTERSERTAL TO INTERGRANULAR;
Alteration : SLIGHTLY
SEE SECTION 49-1;
Comments : SAME UNIT AS SECTION 49-4;
Leg : 61 Top/Bottom Interval(mm): 0/1190 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 775.19
Core: 50 Top of Core Depth (m) : 774.00
Sect: 1 Top of Section Depth(m): 774.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-12), 1B (12-29), 1C (26-60), 1D (58-85),
1E (81-94), 1F (95-112);
Texture : HOMOGENEOUS MEDIUM-GRAINED, SUBOPHITIC TO
INTERGRANULAR;
Structure : MASSIVE DOLERITE SILL;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS CORE 49;
Phenocrysts: PLAGIOCLASE
Size(mm): 0.8
CLINOPYROXENE
MICROPHENOS, EQUAL AMOUNT TO PLAG, OFTEN FORMING
AGGREGATES;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MAGNETITE
MICROLITES;
Replacement: CHLORITE
Minerals Replaced: CPX
SPOTTED DISTRIBUTION;
Leg : 61 Top/Bottom Interval(mm): 0/1280 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 776.78
Core: 50 Top of Core Depth (m) : 774.00
Sect: 2 Top of Section Depth(m): 775.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-50), 1B (50-64), 1C (64-125);
Texture : INTERVAL (0-35) IS MEDIUM TO SLIGHTLY COARSE-
GRAINED, REMAINS SLIGHTLY COARSE-GRAINED TO
150CM WITH THE EXCEPTION OF GRANOPHYRIC SCHLIEREN AT
101-102CM AND 119-121CM, MEDIUM-GRAINED BASALT IS
SUBOPHITIC TO INTERGRANULAR, THE SLIGHTLY COARSE-
GRAINED BASALT IS SUBOPHITIC, MICROPHENOS IN THE
SLIGHTLY COARSE-GRAINED BASALT ARE MORE FREQUENTLY
ABSORBED THAN IN THE MEDIUM-GRAINED BASALT, THE
GRANOPHYRE LAYERS ARE MADE OF PHENOS OF PLAG AND
CPX AND MAGN PLUS A SMALL AMOUNT OF MICROPEGMATITE;
Structure : MASSIVE DOLERITE SILL;
Phenocrysts: PLAGIOCLASE
Size(mm): 1.5
CLINOPYROXENE
MAGNETITE
MICROPHENOS;
Replacement: CHLORITE
Minerals Replaced: CPX
SPOTTY DISTRIBUTION;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 778.50
Core: 50 Top of Core Depth (m) : 774.00
Sect: 3 Top of Section Depth(m): 777.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-36), 1B (36-47), 1C (47-110),
1D (110-127), 1E (128-150);
Texture : COARSE-GRAINED, SUBOPHITIC TO OPHITIC;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE+ZEOLITE(PHILLIPSITE)+PYRITE, GRANOPHYRE
SCHLIEREN OCCURS AT 14 TO 18CM (2 TO 3MM PHENOS) AND
47 TO 53CM (2 TO 3MM PHENOS) AND 124 TO 133CM (5MM
PHENOS);
Alteration : MOD;
Comments : SAME UNIT AS SECTION 50-2;
Phenocrysts: PLAGIOCLASE
MICROPHENOS, 2 TO 3MM AT INTERVALS (14-18) AND
(47-53), 5MM AT INTERVAL (124-133);
Replacement: CHLORITE
ZEOLITE
PHILLIPSITE;
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 779.99
Core: 50 Top of Core Depth (m) : 774.00
Sect: 4 Top of Section Depth(m): 778.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-15), 1B (15-27), 1C (27-66), 1D (67-81),
1E (82-105), 1F (105-149);
Texture : GRAIN SIZE DECREASES DOWNWARD FROM COARSE TO
SLIGHTLY COARSE, SUBOPHITIC TO INTERSERTAL, (SEE
SECTION 50-4);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE+ZEOLITE(PHILLIPSITE) AND PYRITE;
Alteration : MOD;
Comments : SAME UNIT AS SECTION 50-3;
Replacement: CHLORITE
ZEOLITE
PHILLIPSITE;
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1410 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 781.41
Core: 50 Top of Core Depth (m) : 774.00
Sect: 5 Top of Section Depth(m): 780.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-18), 1B (19-39), 1C (39-47), 1D (47-55),
1E (55-71), 1F (72-76), 1G (76-85), 1H (87-100),
1I (100-108), 1J (107-117), 1K (117-125),
1L (125-130), 1M (130-141);
Texture : GRAIN SIZE DECREASING SLIGHTLY FROM SLIGHTLY COARSE
TO MEDIUM, INTERGRANULAR TO INTERSERTAL (SEE 50-2);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE+ZEOLITE(PHILLIPSITE)+PYRITE;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 50-4;
Replacement: CHLORITE
ZEOLITE
PHILLIPSITE;
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 782.98
Core: 50 Top of Core Depth (m) : 774.00
Sect: 6 Top of Section Depth(m): 781.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-10), 1B (12-20), 1C (21-30), 1D (30-35),
1E (35-50), 1F (50-62), 1G (62-70), 1H (70-76),
1I (77-90), 1J (91-99), 1K (100-120), 1L (120-130),
1M (131-148);
Texture : HOMOGENEOUSLY MEDIUM-GRAINED, INTERGRANULAR TO
INTERSERTAL (SEE 50-1);
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE+ZEOLITE(PHILLIPSITE)+PYRITE;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 50-5;
Leg : 61 Top/Bottom Interval(mm): 0/1460 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 779.96
Core: 51 Top of Core Depth (m) : 778.50
Sect: 1 Top of Section Depth(m): 778.50
LITHOLOGY: MICRODOLERITES;
MASSIVE BASALT SILL;
Piece No. : PCE 1A (0-6), 1B (5-15), 1C (15-22), 1D (22-32),
1E (33-35), 1F (35-56), 1G (57-62), 1H (62-66),
1I (67-71), 1J (71-96), 1K (96-100), 1L (105-115),
1M (115-129), 1N (129-145);
Texture : HOMOGENEOUSLY MEDIUM-GRAINED MICRODOLERITE, NO
VISIBLE VARIATION OF GRAIN SIZE;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH PYRITE+
CHLORITE+CLAY;
Alteration : FRESH
GNDMASS IS VERY FRESH EXCEPT SMALL DISSEMINATED
PALE GREEN CLAY PSEUDOMORPHS AFTER OL(?);
Replacement: CHLORITE
CLAY MINERALS
Minerals Replaced: OL
DISSEMINATED PALE GREEN CLAY PSEUDOMORPHS AFTER
OL?;
ZEOLITE
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MAGNETITE
OLIVINE
ID UNCERTAIN;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 781.50
Core: 51 Top of Core Depth (m) : 778.50
Sect: 2 Top of Section Depth(m): 780.00
LITHOLOGY: MICRODOLERITES;
MASSIVE BASALT SILL;
SAME MICRODOLERITE AS SECTION 51-1;
Piece No. : PCE 1A (0-12), 1B (12-20), 1C (20-23), 1D (23-30),
1E (30-35), 1F (36-44), 1G (44-51), 1H (42-61),
1I (62-75), 1J (75-85), 1K (85-94), 1L (94-98),
1M (98-106), 1N (107-115), 1O (116-150);
Texture : HOMOGENEOUSLY MEDIUM-GRAINED MICRODOLERITE;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH PYRITE+
CHLORITE+CLAY;
Alteration : SLIGHTLY
GNDMASS IS VERY FRESH EXCEPT SMALL DISSEMINATED
PALE GREEN CLAY PSEUDOMORPHS AFTER OL(?);
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MAGNETITE
OLIVINE
ID UNCERTAIN;
Replacement: PYRITE
CHLORITE
CLAY MINERALS
Minerals Replaced: OL
PALE GREEN CLAY PSEUDOMORPHS;
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/ 530 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 782.03
Core: 51 Top of Core Depth (m) : 778.50
Sect: 3 Top of Section Depth(m): 781.50
LITHOLOGY: MICRODOLERITES;
SAME MICRODOLERITE AS SECTION 51-2;
Piece No. : PCE 1A (0-16), 1B (16-21), 1C (22-30), 1D (30-53);
Texture : APHYRIC, MEDIUM-GRAINED;
Structure : VEINS FILLED WITH PYRITE+CHLORITE+CLAY+ZEOLITE;
Alteration : SLIGHTLY;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MAGNETITE
OLIVINE
ID UNCERTAIN;
Replacement: PYRITE
CHLORITE
CLAY MINERALS
Minerals Replaced: OL
PALE GREEN CLAY PSEUDOMORPHS;
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 530/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 783.00
Core: 51 Top of Core Depth (m) : 778.50
Sect: 3 Top of Section Depth(m): 782.03
LITHOLOGY: MICRODOLERITE;
Piece No. : PCE 1E (53-60), 1F (61-75), 1G (75-90), 1H (90-100),
1I (100-110), 1J (110-121), 1K (121-150);
Texture : GRADUALLY MORE FINE-GRAINED THAN ABOVE, AT (140-148)
A ROUNDED APHANITIC SEPARATION APPEARS TO BE DUE TO
LOCAL QUENCH NEAR BOTTOM OF SILL;
Structure : VEINS FILLED WITH PYRITE+CHLORITE+CLAY+ZEOLITE;
Alteration : SLIGHTLY;
Replacement: PYRITE
CHLORITE
CLAY MINERALS
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/ 230 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 783.23
Core: 51 Top of Core Depth (m) : 778.50
Sect: 4 Top of Section Depth(m): 783.00
LITHOLOGY: BASALT SILL;
Piece No. : PCE 1A (0-6), 1B (6-11), 1C (11-17), 1D (17-23);
Texture : FINE-GRAINED TO APHANITIC;
Structure : BOTTOM OF SILL, VEINS FILLED WITH PYRITE+CHLORITE+
CLAY+ZEOLITE;
Alteration : SLIGHTLY;
Leg : 61 Top/Bottom Interval(mm): 230/ 300 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 783.30
Core: 51 Top of Core Depth (m) : 778.50
Sect: 4 Top of Section Depth(m): 783.23
LITHOLOGY: BASALTIC GLASS;
Piece No. : PCE 1E (23-30);
Texture : COARSE PCE OF DARK-BROWN GLASS;
Structure : CUT BY ZEOLITE VEINS;
Alteration : SLIGHTLY
ALTERED AROUND OUTER SURFACE TO CHLORITE+HEMATITE+
CLAY;
Replacement: CHLORITE
HEMATITE
CLAY MINERALS
ZEOLITE
Comments : DARK BROWN;
Leg : 61 Top/Bottom Interval(mm): 300/ 950 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 783.95
Core: 51 Top of Core Depth (m) : 778.50
Sect: 4 Top of Section Depth(m): 783.30
LITHOLOGY: APHANITIC BASALT TO MICRODOLERITES;
Piece No. : PCE 2 (32-94);
Texture : APHANITIC BASALT WITH GLASSY MARGINS AND FINE-
GRAINED TO MEDIUM-GRAINED MICRODOLERITES;
Alteration : SLIGHTLY;
Comments : SMALL PCES FROM CORE CATCHER;
Leg : 61 Top/Bottom Interval(mm): 0/1460 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 788.96
Core: 52 Top of Core Depth (m) : 787.50
Sect: 1 Top of Section Depth(m): 787.50
LITHOLOGY: DOLERITE;
Piece No. : PCE 1 (1-139);
Texture : A FEW (<1%) CPX PHENOS (0.5MM) IN A VERY HOMOGENEOUS
DIABASE, MINOR GRAIN SIZE VARIATION IS APPARENT;
Structure : VEINS OF GREEN CLAY (84-37)+QTZ (105-112)+PYRITE;
Alteration : SLIGHTLY
THERE ARE A FEW PATCHES OF BROWN CLAY;
Comments : CLEARLY ONE UNIT;
Replacement: CLAY
GREEN AND BROWN CLAY;
PYRITE
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): 0.5
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 790.48
Core: 52 Top of Core Depth (m) : 787.50
Sect: 2 Top of Section Depth(m): 789.00
LITHOLOGY: DOLERITE;
Piece No. : PCE 1 (0-148);
Structure : GREEN CLAY VEINS ARE COMMON;
Texture : HOMOGENEOUS COARSE-GRAINED DOLERITE, NO VISIBLE CLAY
PATCHES AS IN SECTION 52-1;
Replacement: CLAY MINERALS
GREEN CLAY FILLING VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/1210 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 791.71
Core: 52 Top of Core Depth (m) : 787.50
Sect: 3 Top of Section Depth(m): 790.50
LITHOLOGY: DOLERITE;
SIMILAR TO THAT DESIRED ABOVE;
Piece No. : PCE 1 (0-65), 2 (67-72), 3 (75-85), 4 (87-100),
5 (101-106), 6 (110-128);
Texture : FINE-GRAINED, GRAIN SIZE DECREASES DOWNWARD;
Alteration : SAME ALTERATION AS PREVIOUS SECTION;
Comments : GREY MATRIX;
Phenocrysts: ( 1-2%)
Size(mm): 0.2-0.5
MAFIC PHENOS;
Replacement: CLAY MINERALS
GREEN CLAY FILLING VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/ 510 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 792.51
Core: 52 Top of Core Depth (m) : 787.50
Sect: 4 Top of Section Depth(m): 792.00
LITHOLOGY: FINE-GRAINED BASALT;
SIMILAR TO THE BOTTOM OF 52-3;
Piece No. : PCE 1 (1-41), 2 (44-50);
Texture : FINE-GRAINED, PCE 2 (43-52) HAS A THIN (49-50) PCE
OF GLASS IN CONTACT WITH FINE-GRAINED BASALT NEAR
THE BOTTOM OF PCE 2;
Alteration : SLIGHTLY;
Comments : ONLY PCE 2 IS ORIENTED, ALL OTHER PCES ARE
UNORIENTED AND OUT OF STRATIGRAPHIC ORDER;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 793.50
Core: 53 Top of Core Depth (m) : 792.00
Sect: 1 Top of Section Depth(m): 792.00
LITHOLOGY: CPX-PLAG MICROPHYRIC BASALT;
MASSIVE BASALT;
Piece No. : PCE 1A (0-16), 1B (16-22), 1C (21-31), 1D (32-41),
1E (42-50), 2 (54-60), 3 (62-73), 4A (76-85),
4B (85-100), 5 (101-104), 6 (114-125), 7A (129-140),
7B (140-150);
Texture : MICROPHYRIC, UNIT 1 (PCES 1A-2) IS FINE-GRAINED,
THIN (1CM) GLASSY MARGINS AT THE TOP AND BOTTOM OF
THE UNIT, GRAIN SIZE INCREASES IN INTERVAL (1-25) TO
A FINE-GRAIN SIZE AND DECREASES IN INTERVAL (25-59),
APHYRIC TO HYALOPILITIC, IN UNIT 2 (PCES 3-7B)
BASALT IS FINE-GRAINED WITH THIN (2CM) UPPER GLASSY
MARGIN, GRAIN SIZE INCREASES DOWNWARD FROM 62CM;
Structure : MASSIVE BASALT, VEINS FILLED WITH CHLORITE+PYRITE;
Alteration : SLIGHTLY;
Comments : UNIT 1 (0-60) AND UNIT 2 (61-150);
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
PLAGIOCLASE
MICROPHENOS;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 794.95
Core: 53 Top of Core Depth (m) : 792.00
Sect: 2 Top of Section Depth(m): 793.50
LITHOLOGY: BASALT SILL;
Piece No. : PCE 1 (1-18), 2A (23-34), 2B (34-45), 3A (50-57),
3B (57-66), 3C (67-72), 3D (73-84), 3E (84-105),
3F (105-111), 3G (112-120), 3H (120-128),
3I (129-137), 3J (136-145);
Texture : PCES 1-3F ARE HYALOPILITIC, PCES 3G-3J ARE
INTERSERTAL, GRAIN SIZE INCREASES DOWNWARD FROM FINE
TO SLIGHTLY MEDIUM;
Structure : BASALT SILL, VEINS ARE FILLED WITH CHLORITE+ZEOLITE+
PYRITE;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS LOWER ONE IN SECTION 53-1;
Replacement: CHLORITE
ZEOLITE
PYRITE
FILLING VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 798.99
Core: 54 Top of Core Depth (m) : 797.50
Sect: 1 Top of Section Depth(m): 797.50
LITHOLOGY: OL-CPX-PLAG MICROPHYRIC BASALT;
MASSIVE PILLOW BASALT;
Piece No. : PCE 1 (1-5), 2A (8-20), 2B (23-25), 3 (30-40),
4 (42-47), 5A (50-60), 5B (60-65), 6 (69-78),
7A (83-90), 7B (90-100), 7C (100-105), 8A (112-115),
8B (117-120), 8C (120-130), 8D (130-140),
8E (140-149);
Texture : MICROPHYRIC, GLASSY UNITS BETWEEN UNITS ARE 1-2CM,
INNER PART OF EACH UNIT IS SLIGHTLY MEDIUM TO FINE-
GRAINED (APHANITIC), UNIT 1 IS WITHOUT AN UPPER PART
AND ONLY HAS A LOWER CHILLED MARGIN, UNITS 2-4 HAVE
LOWER AND UPPER GLASSY MARGINS, UNIT 5 ONLY HAS A
GLASSY UPPER MARGIN;
Structure : PILLOW BASALT;
Alteration : SLIGHTLY;
Comments : UNIT 1 IS INTERVAL (0-20), UNIT 2 IS INTERVAL
(20-58), UNIT 3 IS INTERVAL (58-90), UNIT 4 IS
INTERVAL (90-120), UNIT 5 IS INTERVAL (120-NEXT
SECTION);
Phenocrysts: OLIVINE
CLINOPYROXENE
PLAGIOCLASE
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MAGNETITE
GLASS IN GNDMASS;
Leg : 61 Top/Bottom Interval(mm): 0/1300 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 800.30
Core: 54 Top of Core Depth (m) : 797.50
Sect: 2 Top of Section Depth(m): 799.00
LITHOLOGY: MASSIVE PILLOW BASALT;
CONTINUED FROM 54-1;
Piece No. : PCE 1A (0-17), 1B (18-32), 1C (29-42), 1D (42-51),
2 (55-65), 3A (67-76), 3B (77-84), 3C (84-93),
3D (92-97), 3E (100-110), 3F (110-119),
3G (119-127);
Texture : MICROPHYRIC, INNER PART OF EACH UNIT IS SLIGHTLY
MEDIUM TO FINE-GRAINED, NO DISTINCT GLASSY MARGINS;
Structure : PILLOW BASALT, VEINS OF ZEOLITE(PHILLIPSITE?)+
CHLORITE, MASSIVE;
Alteration : SLIGHTLY;
Comments : UNIT 5 IS INTERVAL (0-66) AND IS CONTINUED FROM
BASALT UNIT OF SECTION 54-1, UNIT 6 IS INTERVAL
(66-120?);
Phenocrysts: OLIVINE
CLINOPYROXENE
PLAGIOCLASE
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MAGNETITE
GLASS IN GNDMASS;
Replacement: CHLORITE
ZEOLITE
POSSIBLY PHILLIPSITE;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 802.50
Core: 55 Top of Core Depth (m) : 801.00
Sect: 1 Top of Section Depth(m): 801.00
LITHOLOGY: MICRODOLERITES;
Piece No. : PCE 1A (0-5), 1B (5-15), 2 (17-30), 3 (33-42),
4 (45-55), 5 (57-64), 6 (70-75), 7A (78-86),
7B (87-92), 8A (95-103), 8B (103-112), 8C (112-120),
9 (122-130), 10 (132-137), 11 (141-149);
Texture : TWO UNITS OF MICRODOLERITES DIVIDED BY GLASSY
MARGINS, TEXTURE NEAR THE GLASSY MARGINS ARE MICRO-
EQUIGRANULAR-WHICH GRADES TO MICRODOLERITES IN THE
INTERIOR OF THE UNITS;
Structure : VEINS ARE FILLED WITH ZEOLITE DRUSES AND PYRITE+
CHLORITE+CLAY AND CALCITE+CLAY;
Alteration : SLIGHTLY;
Comments : UNIT 1 IS INTERVAL (0-30), UNIT 2 IS INTERVAL
(30-93), UNIT 3 IS INTERVAL (93-130), UNIT 4 IS
INTERVAL (130-150);
Vesicles : VESICULAR NEAR THE GLASSY MARGINS;
Phenocrysts: OLIVINE
PLAGIOCLASE
Groundmass : PLAGIOCLASE
CLINOPYROXENE
GLASS IN GNDMASS;
MAGNETITE
PYROXENE
Replacement: CLAY MINERALS
Minerals Replaced: OL
ZEOLITE
CHLORITE
CALCITE
Leg : 61 Top/Bottom Interval(mm): 0/1050 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 803.55
Core: 55 Top of Core Depth (m) : 801.00
Sect: 2 Top of Section Depth(m): 802.50
LITHOLOGY: MICRODOLERITES;
SAME MICRODOLERITES AS IN SECTION 55-1;
Piece No. : PCE 1 (0-10), 2 (11-20), 3 (24-32), 4 (37-60),
5 (65-75), 6 (77-90), 7 (91-101);
Texture : UNIT 1 DOLERITES ARE THE SAME AS IN SECTION 55-1, IN
UNIT 2 SOME SMALL PCES WITH GLASSY MARGINS, IN UNIT
MEDIUM-GRAINED-SLIGHTLY PHYRIC MICRODOLERITES SIMILA
TO THOSE FROM THE INTERIOR OF SILLS;
Structure : VEINS ARE PYRITE+CHLORITE+CLAY;
Alteration : SLIGHTLY;
Comments : UNIT 1 IS INTERVAL (0-35), UNIT 2 IS INTERVAL
(35-62), UNIT 3 (62-104);
Phenocrysts: OLIVINE
PLAGIOCLASE
Groundmass : PLAGIOCLASE
CLINOPYROXENE
GLASS IN GNDMASS;
MAGNETITE
PYROXENE
Replacement: CLAY MINERALS
Minerals Replaced: OL
PYRITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 808.00
Core: 56 Top of Core Depth (m) : 806.50
Sect: 1 Top of Section Depth(m): 806.50
LITHOLOGY: MICRODOLERITE;
MINERAL COMPOSITION AND TEXTURE AND ALTERATION SAME
AS IN ABOVE SECTIONS 55-1+2;
Piece No. : PCE 1 (1-4), 2 (6-10), 3 (12-27), 4A (30-35),
4B (35-45), 4C (45-55), 4D (55-43), 4E (63-72),
4F (72-95), 4G (95-112), 4H (112-126), 4I (125-135),
4J (135-145), 4K (145-150);
Texture : GRAIN SIZE GRADUALLY CHANGES FROM APHANITIC
MICRODOLERITE OR BASALT (AT 0CM) TO MEDIUM-GRAINED
DOLERITE (AT 75CM) AND GRADUALLY BACK TO APHANITIC
(TO 150CM) MICRODOLERITE OR BASALT;
Structure : VEINS FILLED WITH PYRITE+CHLORITE+CLAY;
Alteration : SLIGHTLY;
Replacement: PYRITE
CHLORITE
CLAY
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 809.50
Core: 56 Top of Core Depth (m) : 806.50
Sect: 2 Top of Section Depth(m): 808.00
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 1 (0-5), 2 (8-12), 3 (17-22), 4 (25-30),
5 (32-38), 6A (42-50), 6B (50-57), 6C (58-65),
6D (65-71), 7 (75-80), 8 (83-90), 9 (94-100),
10 (100-110), 11 (112-120), 12 (124-130),
13 (131-140), 14 (143-150);
Texture : IN (0-25) AND (72-150) GLASSY ZONES ARE 1-2CM
THICK, IN INTERVAL (25-72) FINE-GRAINED BASALT
GRADES DOWNWARD TO MICRODOLERITE (50CM) AND BACK TO
FINE-GRAINED BASALT (72CM);
Structure : INTERVALS (0-25) AND (72-150) SMALL PCES OF ALTERED
PILLOWED BASALTS, ELONGATION OF GLASSY PILLOW BOTH
SUB-HORIZONTALLY AND SUB-VERTICALLY;
Alteration : SLIGHTLY;
Structure : FROM 92 TO 98CM OCCURS A THICK VEIN IN THE GLASSY
MARGIN-THE VEIN IS COARSE FAN-SHAPED AND XTLN AND
FILLED WITH TRANSPARENT ZEOLITE;
Comments : THERE ARE 4 COOLING UNITS AT (0-25) AND (25-80) AND
(80-150?);
Replacement: PYRITE
CHLORITE
CLAY
ZEOLITE
TRANSPARENT;
Leg : 61 Top/Bottom Interval(mm): 0/1030 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 810.53
Core: 56 Top of Core Depth (m) : 806.50
Sect: 3 Top of Section Depth(m): 809.50
LITHOLOGY: APHYRIC BASALT;
DOLERITE;
Piece No. : PCE 1 (0-5), 2 (7-101);
Texture : APHYRIC, FRAGMENTS OF PILLOWED BASALTS AND FINE-
GRAINED MICRODOLERITES;
Structure : PILLOWED BASALT FRAGMENTS;
Alteration : SLIGHTLY;
Comments : STRATIGRAPHIC POSITION OF PCES UNKNOWN;
Vesicles :
Location: Filling: OPAL
COARSE VUGS ARE FILLED WITH OPAL;
Replacement: OPAL
Leg : 61 Top/Bottom Interval(mm): 0/ 70 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 815.57
Core: 57 Top of Core Depth (m) : 815.50
Sect: 1 Top of Section Depth(m): 815.50
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 1 (1-7);
Texture : LOWER MARGIN OF PILLOW LAVA, GLASSY AT 5-7CM;
Structure : PILLOW BASALT WITH CRACKS AND VEINS OF PYRITE+
CHLORITE+CLAY AND ZEOLITE;
Alteration : SLIGHTLY;
Replacement: PYRITE
CLAY MINERALS
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 80/ 510 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 816.01
Core: 57 Top of Core Depth (m) : 815.50
Sect: 1 Top of Section Depth(m): 815.58
LITHOLOGY: BASALT;
Piece No. : PCE 2 (8-17), 3 (20-27), 4 (29-40), 5 (43-51);
Texture : WITHOUT LOWER GLASSY MARGIN;
Structure : PILLOW BASALT WITH CRACKS AND VEINS OF PYRITE+
CHLORITE+CLAY AND ZEOLITE;
Alteration : SLIGHTLY;
Comments : SINGLE UNIT;
Replacement: PYRITE
CLAY MINERALS
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 520/ 610 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 816.11
Core: 57 Top of Core Depth (m) : 815.50
Sect: 1 Top of Section Depth(m): 816.02
LITHOLOGY: APHYRIC TO HYALOPILITIC BASALT;
Piece No. : PCE 6 (52-61);
Texture : APHYRIC TO HYALOPILITIC, FROM 52 TO 54CM IS THE UPPE
GLASSY MARGIN WHICH IS APHYRIC TO HYALOPILITIC, THE
CORE OF THE UNIT IS APHANITIC TO INTERSERTAL WITH
PLAG AND CPX MICROPHENOS;
Structure : PILLOW BASALT WITH CRACKS OR VEINS FILLED WITH
PYRITE+CHLORITE+CLAY AND ZEOLITE;
Alteration : SLIGHTLY;
Replacement: PYRITE
CLAY MINERALS
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 620/1490 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 816.99
Core: 57 Top of Core Depth (m) : 815.50
Sect: 1 Top of Section Depth(m): 816.12
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 7 (62-68), 9 (91-100), 11 (119-126),
13 (144-149);
Structure : PILLOW BASALT WITH CRACKS OR VEINS FILLED WITH
PYRITE+CLAY+CHLORITE AND ZEOLITE;
Alteration : SLIGHTLY;
Comments : INNER PART OF PILLOW LAVA;
Replacement: PYRITE
CLAY MINERALS
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 710/1400 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 816.90
Core: 57 Top of Core Depth (m) : 815.50
Sect: 1 Top of Section Depth(m): 816.21
LITHOLOGY: PLAG-CPX MICROPHYRIC BASALT;
Piece No. : PCE 8 (71-90), 10 (104-116), 12 (128-140);
Texture : MICROPHYRIC, ALMOST FINE-GRAINED TO SLIGHTLY MEDIUM-
GRAINED, SMALL CRUSHED PARTICLES;
Structure : PILLOW BASALT WITH CRACKS OR VEINS FILLED WITH
PYRITE+CLAY+CHLORITE AND ZEOLITE;
Alteration : SLIGHTLY;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
MICROPHENOS;
Replacement: ZEOLITE
CHLORITE
CLAY MINERALS
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 40 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 824.54
Core: 58 Top of Core Depth (m) : 824.50
Sect: 1 Top of Section Depth(m): 824.50
LITHOLOGY: BASALT;
Piece No. : PCE 1 (1-4);
Structure : BASALT CAVITY FILLED WITH ZEOLITE (ANALCITE?);
Alteration : SLIGHTLY;
Replacement: ZEOLITE
Size(mm): 1-2
AVERAGE 1-2MM LONG WITH A MAXIMUM OF 5MM, POSSIBLY
ANALCITE;
Leg : 61 Top/Bottom Interval(mm): 40/ 770 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 825.27
Core: 58 Top of Core Depth (m) : 824.50
Sect: 1 Top of Section Depth(m): 824.54
LITHOLOGY: BASALT;
Piece No. : PCE 2 (6-18), 3A (20-30), 3B (30-47), 3C (47-62),
3D (62-77);
Texture : SLIGHTLY MEDIUM-GRAINED (INTERSERTAL);
Structure : BASALT WITH VEINS FILLED WITH CHLORITE+PYRITE+CLAY
AND ZEOLITE;
Alteration : SLIGHTLY;
Replacement: ZEOLITE
CHLORITE
PYRITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 770/ 950 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 825.45
Core: 58 Top of Core Depth (m) : 824.50
Sect: 1 Top of Section Depth(m): 825.27
LITHOLOGY: PLAG-CPX MICROPHYRIC BASALT;
Piece No. : PCE 3E (78-88), 4 (90-95);
Texture : MICROPHYRIC, PCE 3E IS SLIGHTLY FINE-GRAINED AND
HYALOPILITIC, PCE 4 IS FINE-GRAINED;
Structure : BASALT WITH VEINS FILLED WITH CHLORITE+PYRITE+CLAY
AND ZEOLITE;
Alteration : SLIGHTLY;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
MICROPHENOS;
Replacement: CLAY MINERALS
CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 950/1060 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 825.56
Core: 58 Top of Core Depth (m) : 824.50
Sect: 1 Top of Section Depth(m): 825.45
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 5 (99-106);
Texture : APHYRIC, FINE-GRAINED WITH GLASSY MARGIN(2CM THICK);
Structure : ZEOLITE VEIN NOTED;
Alteration : SLIGHTLY
SPOT OF ZEOLITE NOTED;
SLIGHTLY;
Replacement: ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 1060/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 826.00
Core: 58 Top of Core Depth (m) : 824.50
Sect: 1 Top of Section Depth(m): 825.56
LITHOLOGY: BASALT;
Piece No. : PCE 6 (109-115), 7 (117-122), 8 (125-132),
9 (135-140), 10 (145-150);
Texture : PCES 6-10 EXCLUDING 7 ARE SMALL CRUSHED FINE-GRAINED
PARTICLES WITH GLASSY MARGINS (1-2CM THICK);
Structure : BASALT WITH VEINS OF CHLORITE+PYRITE+CLAY AND
ZEOLITE, PCE 7 HAS A ZEOLITE AND FE.OXIDE VEIN;
Alteration : SLIGHTLY;
Comments : DIFFERENT UNIT THAN ABOVE;
Replacement: ZEOLITE
PYRITE
CHLORITE
CLAY MINERALS
FERROUS OXIDE
Leg : 61 Top/Bottom Interval(mm): 0/ 200 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 826.20
Core: 58 Top of Core Depth (m) : 824.50
Sect: 2 Top of Section Depth(m): 826.00
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (1-8), 2 (10-20);
Texture : APHYRIC, FINE-GRAINED, ANHEDRAL;
Structure : VEINS FILLED WITH ZEOLITE AND CHLORITE;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS LOWER UNIT OF SECTION 58-1;
Groundmass : CLINOPYROXENE
ANHEDRAL CRYSTALS;
Replacement: ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 200/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 827.50
Core: 58 Top of Core Depth (m) : 824.50
Sect: 2 Top of Section Depth(m): 826.20
LITHOLOGY: CPX-PLAG MICROPHYRIC BASALT;
Piece No. : PCE 3A (22-36), 3B (30-51), 4A (52-60), 4B (60-70),
4C (70-80), 4D (80-86), 5 (92-110), 6 (111-118),
7A (120-130), 7B (130-140), 7C (140-150);
Texture : MICROPHYRIC, FINE TO SLIGHTLY MEDIUM-GRAINED
(HYALOPILITIC TO INTERSERTAL);
Structure : VEINS FILLED WITH ZEOLITE AND CHLORITE-PARTICULARLY
DEVELOPING IN PCES 3B+5+7A+7B;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS LOWER UNIT OF SECTION 58-1;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
MICROPHENOS;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MAGNETITE
PLUS GLASS, ALL MICROLITES;
Replacement: ZEOLITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/ 420 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 827.92
Core: 58 Top of Core Depth (m) : 824.50
Sect: 3 Top of Section Depth(m): 827.50
LITHOLOGY: CPX MICROPHYRIC BASALT;
Piece No. : PCE 1 (1-10), 2A (15-21), 2B (22-42);
Texture : MICROPHYRIC, INTERVAL (1-35) IS SLIGHTLY FINE-
GRAINED, INTERVAL (35-42) IS SLIGHTLY MEDIUM TO
MEDIUM-GRAINED, APHANITIC;
Structure : VEINS FILLED WITH ZEOLITE+CHLORITE+PYRITE;
Alteration : FRESH;
Phenocrysts: CLINOPYROXENE
AMOUNT AND SIZE OF CPX MICROPHENOS IS INTERVAL
(35-42) ARE LARGER THAN UPPER PART;
Replacement: ZEOLITE
PYRITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 420/1430 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 828.93
Core: 58 Top of Core Depth (m) : 824.50
Sect: 3 Top of Section Depth(m): 827.92
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 3 (45-80), 4A (82-92), 4B (91-109),
4C (110-120), 4D (120-130), 4E (130-143);
Texture : APHYRIC, TOP OF PCE 3 IS FINE-GRAINED, IN PCES 3-4E
GRADUALLY INCREASING GRAIN SIZE FROM FINE TO
SLIGHTLY FINE, APHANITIC, IN INTERVAL (42-60) CPX
MICROPHENOS;
Structure : VEINS ARE FILLED WITH ZEOLITE+PYRITE+CHLORITE;
Alteration : SLIGHTLY;
Replacement: ZEOLITE
PYRITE
CHLORITE
Phenocrysts: CLINOPYROXENE
CPX PHENOS IN INTERVAL (42-60);
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 830.50
Core: 58 Top of Core Depth (m) : 824.50
Sect: 4 Top of Section Depth(m): 829.00
LITHOLOGY: CPX MOD PHYRIC BASALT;
Piece No. : PCE 1A (1-29), 1B (30-37), 2A (41-55), 2B (54-65),
3 (67-77), 4 (80-83), 7 (106-125), 8A (128-138),
8B (140-150);
Texture : MOD PHYRIC, FINE-GRAINED, APHANITIC;
Structure : VEINS ARE FILLED WITH ZEOLITE+CHLORITE+PYRITE;
Alteration : FRESH TO SLIGHTLY;
Phenocrysts: CLINOPYROXENE
Replacement: PYRITE
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 830.50
Core: 58 Top of Core Depth (m) : 824.50
Sect: 4 Top of Section Depth(m): 829.00
LITHOLOGY: CPX SLIGHTLY MICROPHYRIC BASALT;
Piece No. : PCE 5 (86-94), 6 (95-104);
Texture : SLIGHTLY MICROPHYRIC, FINE-GRAINED;
Structure : VEINS ARE FILLED WITH ZEOLITE+CHLORITE+PYRITE;
Alteration : FRESH TO SLIGHTLY;
Phenocrysts: CLINOPYROXENE
(NOS; %)
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 630 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 831.13
Core: 58 Top of Core Depth (m) : 824.50
Sect: 5 Top of Section Depth(m): 830.50
LITHOLOGY: CPX SLIGHTLY PHYRIC BASALT;
Piece No. : PCE 1 (1-6), 2 (10-20), 3 (22-34), 4A (36-45),
4B (45-50) 5 (54-61);
Texture : SLIGHTLY PHYRIC, FINE-GRAINED, APHANITIC;
Structure : VEINS ARE FILLED WITH ZEOLITE+CHLORITE+PYRITE;
Alteration : FRESH;
Phenocrysts: CLINOPYROXENE
Replacement: PYRITE
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 834.95
Core: 59 Top of Core Depth (m) : 833.50
Sect: 1 Top of Section Depth(m): 833.50
LITHOLOGY: CPX SLIGHTLY PHYRIC BASALT;
Piece No. : PCE 1 (1-81), 2 (84-136);
Texture : SLIGHTLY PHYRIC, PHENOS IN A MATRIX OF DIABASIC TO
FINE-GRAINED EQUIGRANULAR TEXTURED BASALT, GRAIN
SIZE IS SLIGHTLY COARSER THAN THE FINE-GRAINED
BASALT IN THE LOWER PORTION OF THE SECTION, CLAY
PATCHES OCCUR IN THE COARSE-GRAINED PORTIONS;
Structure : BASALT SILL, VEINS ARE FILLED WITH CLAY+ZEOLITE+
PYRITE;
Alteration : SLIGHTLY
CLAY PATCHES IN COARSE-GRAINED PORTIONS;
Comments : A PORTION OF ONE COOLING UNIT (INTRUSIVE) IS
REPRESENTED IN THIS SECTION;
Phenocrysts: CLINOPYROXENE ( 1-2%)
Size(mm): <=1
Groundmass : PLAGIOCLASE
AUGITE
OPAQUE MINERALS
COMPOSTION OF COARSE-GRAINED GNDMASS PLUS
ALTERATION PRODUCTS;
Replacement: CLAY MINERALS
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1250 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 836.25
Core: 59 Top of Core Depth (m) : 833.50
Sect: 2 Top of Section Depth(m): 835.00
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
SAME MINERALOGY AND TEXURE AND ALTERATION AS COARSE
PORTION OF THE LAST SECTION;
Piece No. : PCE 1 (0-119);
Texture : SPARSELY PHYRIC, FINE-GRAINED, GRAIN SIZE
DECREASES SLIGHTLY DOWNWARD;
Structure : DOLERITE SILL;
Alteration : SLIGHTLY;
Comments : THE TOP OF A SECOND UNIT (INTRUSIVE) IS REPRESENTED
IN THIS SECTION;
Phenocrysts: CLINOPYROXENE ( 1-2%)
Size(mm): <=1
Groundmass : PLAGIOCLASE
AUGITE
OPAQUE MINERALS
COMPOSTION OF COARSE-GRAINED GNDMASS PLUS
ALTERATION PRODUCTS;
Replacement: CLAY MINERALS
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1330 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 837.83
Core: 59 Top of Core Depth (m) : 833.50
Sect: 3 Top of Section Depth(m): 836.50
LITHOLOGY: DOLERITE;
EXACTLY LIKE THAT OF SECTION 2 IN EVERY RESPECT;
Piece No. : PCE 1 (1-117), 2 (120-133);
Texture : MEDIUM TO COARSE-GRAINED;
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 839.49
Core: 59 Top of Core Depth (m) : 833.50
Sect: 4 Top of Section Depth(m): 838.00
LITHOLOGY: DOLERITE;
SAME AS SECTIONS 3 AND 2;
Piece No. : PCE 1 (0-75), 2 (77-90), 3 (94-149);
Texture : MEDIUM TO COARSE-GRAINED DOLERITE, MAFIC PHENOS IN A
FINE-GRAINED MATRIX;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS IN SECTIONS 59-2 AND 59-3;
Phenocrysts: ( 1-2%)
Size(mm): 0.2-0.5
MAFIC PHENOS;
Leg : 61 Top/Bottom Interval(mm): 0/ 140 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 839.64
Core: 59 Top of Core Depth (m) : 833.50
Sect: 5 Top of Section Depth(m): 839.50
LITHOLOGY: DOLERITE SILL;
CONTINUED FROM SECTION 59-4;
Structure : SILL;
Comments : UNIT 2;
Leg : 61 Top/Bottom Interval(mm): 140/1400 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 840.90
Core: 59 Top of Core Depth (m) : 833.50
Sect: 5 Top of Section Depth(m): 839.64
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCE 1 (14-38), 2 (40-47), 3 (50-57), 4 (60-66),
5 (70-85), 6 (88-92), 7 (93-112), 8 (115-138);
Texture : SPARSELY PHYRIC, FINE-GRAINED, GLASSY MARGINS OCCUR
AT 15CM+89CM+113-115CM, THE INTERIOR BASALT IS MADE
OF A FEW PHENOS OF CPX IN A GLASSY TO VARIOLITIC AND
EQUIGRANULAR MATRIX OF APHANITIC DARK AND LIGHT GRAY
BASALT, SOME COARSER GRAINED FRAGMENTS HAVE SPOTTED
TEXTURES;
Structure : FOUR PILLOW BASALT UNITS, VEINS FILLED WITH PYRITE
AND GREEN CLAY;
Comments : FOUR BASALT UNITS (14-59)+(59-85)+(85-113)+
(113-140);
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): <0.5
INTERIOR OF BASALT;
Replacement: ZEOLITE
PYRITE
CLAY MINERALS
GREEN CLAY;
Leg : 61 Top/Bottom Interval(mm): 0/ 500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 841.50
Core: 59 Top of Core Depth (m) : 833.50
Sect: 6 Top of Section Depth(m): 841.00
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
PILLOW BASALT;
SAME AS BOTTOM OF SECTION 5;
Piece No. : PCE 1 (0-50) (TOP);
Texture : SPARSELY PHYRIC;
Structure : PILLOW BASALT;
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): <0.5
Leg : 61 Top/Bottom Interval(mm): 500/1470 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 842.47
Core: 59 Top of Core Depth (m) : 833.50
Sect: 6 Top of Section Depth(m): 841.50
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 1 (50-57) (BOTTOM), 2 (63-70), 3 (71-74),
4 (76-80), 5 (82-95), 6 (96-102), 7 (104-125),
8 (127-147);
Texture : GLASSY MARGINS OCCUR AT 74CM+90CM+95CM+125CM;
Structure : FOUR PILLOW BASALT UNITS;
Comments : FOUR BASALT UNITS (50-74)+(74-90)+(90-125)+
(125-150);
Leg : 61 Top/Bottom Interval(mm): 0/ 640 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 843.14
Core: 59 Top of Core Depth (m) : 833.50
Sect: 7 Top of Section Depth(m): 842.50
LITHOLOGY: PILLOW BASALT;
SAME AS PREVIOUS SECTION;
Piece No. : PCE 1 (0-11), 2 (13-50), 3 (54-61);
Texture : FINE-GRAINED, A THIN GLASSY MARGIN (1-2CM) OCCURS
AT THE TOP OF THE SECTION;
Structure : PILLOW BASALT, VEINS FILLED WITH PYRITE+ZEOLITE+
CLAY;
Comments : THESE FRAGMENTS (PCES 1+2) WERE IN THE CORE CATCHER
AND THEIR STRATIGRAPHIC ORIENTATION IS UNKNOWN;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 843.98
Core: 60 Top of Core Depth (m) : 842.50
Sect: 1 Top of Section Depth(m): 842.50
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCE 1 (0-4), 2 (5-22), 3 (26-30), 4 (34-39),
5 (41-47), 6 (50-62), 7 (65-75), 8 (77-82),
9 (85-135), 10 (137-148);
Texture : SPARSELY PHYRIC, GLASSY MARGINS 1-2CM THICK OCCUR
FROM (0-40)+(40-74)+(74-113)+(113-150), UNITS
RANGE IN TEXTURE FROM GLASSY TO EQUIGRANULAR,
INTERVALS (0-4) AND (85-104) ARE COARSE-GRAINED;
Structure : PILLOW BASALT, VEINS ARE FILLED WITH PYRITE+CLAY+
PHILLIPSITE AND ARE MORE ABUNDANT THAN IN PREVIOUS
CORES;
Alteration : SPOTS OF PYRITE+CLAY+PHILLIPSITE ARE MORE
ABUNDANT THAN PREVIOUS CORES;
Comments : SEVERAL PILLOW UNITS;
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): 0.2-0.4
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
THE COARSER FRAGMENTS HAVE HOLOXTALLINE GNDMASS
OF PLAG+CPX+OP.MINS+ALTERATION PRODUCTS;
Replacement: PYRITE
CLAY MINERALS
PHILLIPSITE
Leg : 61 Top/Bottom Interval(mm): 0/1310 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 845.31
Core: 60 Top of Core Depth (m) : 842.50
Sect: 2 Top of Section Depth(m): 844.00
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
PILLOW BASALT;
IDENTICAL IN ALL RESPECTS TO SECTION 1;
Piece No. : PCE 1 (1-15), 2 (19-51), 3 (54-61), 4 (64-102),
5 (106-115), 6 (119-129);
Texture : SPARSELY PHYRIC;
Structure : PILLOW BASALT;
Alteration : CONCENTRATION OF PHIL OCCURS AT 71CM;
Comments : FOUR UNITS OF PILLOW BASALTS;
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): 0.2-0.4
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
THE COARSER FRAGMENTS HAVE HOLOXTALLINE GNDMASS
OF PLAG+CPX+OP.MINS+ALTERATION PRODUCTS;
Replacement: PYRITE
CLAY MINERALS
PHILLIPSITE
IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 847.00
Core: 60 Top of Core Depth (m) : 842.50
Sect: 3 Top of Section Depth(m): 845.50
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
PILLOW BASALT;
IDENTICAL IN ALL RESPECTS TO THE PREVIOUS SECTION;
Piece No. : PCE 1 (1-40), 2 (40-51), 3 (57-60), 4 (64-106),
5 (108-135), 6 (136-149);
Texture : SPARSELY PHYRIC, SLIGHTLY COARSER GRAINED REGION
AT INTERVAL (30-60);
Structure : PILLOW BASALT;
Comments : TWO UNITS OF PILLOW BASALTS;
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): 0.2-0.4
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
THE COARSER FRAGMENTS HAVE HOLOXTALLINE GNDMASS
OF PLAG+CPX+OP.MINS+ALTERATION PRODUCTS;
Replacement: PYRITE
CLAY MINERALS
PHILLIPSITE
IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/ 900 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 847.90
Core: 60 Top of Core Depth (m) : 842.50
Sect: 4 Top of Section Depth(m): 847.00
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
Piece No. : PCE 1 (0-20), 2 (21-89);
Texture : SPARSELY PHYRIC, APHANITIC GNDMASS, MOST OF THE
FRAGMENTS (20-90) ARE COARSER BASALTS WITH A
HOLOXTALLINE GNDMASS;
Comments : FROM 29 TO 90CM ARE FRAGMENTS FROM THE CORE CATCHER
AND THEIR ORIENTATION AND STRATIGRAPHIC POSITION ARE
UNKNOWN;
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): 0.2-0.4
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
THE COARSER FRAGMENTS HAVE HOLOXTALLINE GNDMASS
OF PLAG+CPX+OP.MINS+ALTERATION PRODUCTS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 853.00
Core: 61 Top of Core Depth (m) : 851.50
Sect: 1 Top of Section Depth(m): 851.50
LITHOLOGY: PILLOW-LIKE BASALT;
Piece No. : PCE 1 (0-5), 2 (8-17), 3 (20-29), 4 (30-35),
5 (37-44), 6A (46-55), 6B (55-61), 6C (62-66),
6D (66-84), 7A (87-105), 7B (103-117), 7C (117-124),
8A (125-140), 8B (140-149);
Texture : IN PCES 1+2 DECREASING GRAIN SIZE DOWNWARD FROM
SLIGHTY MEDIUM TO GLASSY LOWER MARGIN AND APHANITIC
WITH SPARSE SPOTS OF CPX MICROPHENOS, PCES 3+4 HAVE
GLASSY UPPER MARGINS AND PCE 6C HAS A GLASSY LOWER
MARGIN, PCES 3-6C ARE FINE-GRAINED, IN PCES 6D-8B
INCREASING GRAIN SIZE DOWNWARD AND PCE 6D HAS A
GLASSY UPPER MARGIN AND IS FINE-GRAINED, PCES 7A-8B
ARE SLIGHTLY MEDIUM TO MEDIUM-GRAINED AND
INTERSERTAL TEXTURE;
Structure : PILLOW-LIKE BASALT, VEINS ARE FILLED WITH ZEOLITE
(PHIL) AND PYRITE;
Alteration : SLIGHTLY;
Replacement: ZEOLITE
PHIL;
PYRITE
Phenocrysts: CLINOPYROXENE
MICROPHENOS, SPARSE IN PCES 1+2;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 854.50
Core: 61 Top of Core Depth (m) : 851.50
Sect: 2 Top of Section Depth(m): 853.00
LITHOLOGY: PILLOW-LIKE BASALT;
SAME AS SECTION 61-1;
Piece No. : PCE 1A (0-17), 1B (19-30), 2A (34-36), 2B (36-58),
3 (60-80), 4 (85-91), 5 (95-100), 6 (100-110),
7 (115-120), 8A (124-129), 8B (129-132),
8C (135-135), 8D (136-140), 9 (143-150);
Texture : PCES 1A-2B ARE MEDIUM-GRAINED, PCES 3-5 ARE SLIGHTLY
MEDIUM TO SLIGHTLY FINE-GRAINED, PCES 6+7 ARE FINE-
GRAINED AND WITHOUT A GLASSY LOWER MARGIN, PCES 8A-
8D ARE FINE-GRAINED AND WITHOUT GLASSY UPPER MARGIN
ON BOTH SIDES;
Structure : PILLOW-LIKE BASALT, VEINS ARE FILLED WITH ZEOLITE+
CHLORITE+PYRITE;
Alteration : SLIGHTLY;
Comments : THE UNIT IS CONTINUED FROM SECTION 61-1;
Replacement: ZEOLITE
CHLORITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 700 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 855.20
Core: 61 Top of Core Depth (m) : 851.50
Sect: 3 Top of Section Depth(m): 854.50
LITHOLOGY: CPX-OL MICROPHYRIC BASALT;
Piece No. : PCE 1A (0-10), 1B (10-15), 1C (15-20), 2 (22-33),
3 (35-50), 4 (55-66);
Texture : MICROPHYRIC, TOP OF PCE 1A IS AN UPPER GLASSY MARGIN
(2-3CM) AND THE LOWER PORTION IS MICROPHYRIC, PCES
1B+1C ARE SLIGHTLY FINE-GRAINED, PCES 2-4 ARE
SLIGHTLY MEDIUM TO MEDIUM-GRAINED;
Structure : VEINS ARE FILLED WITH CHLORITE+PYRITE+ZEOLITE;
Alteration : FRESH;
Comments : THIS SECTION IS THE SAME UNIT AS IN SECTION 61-2;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
OLIVINE
MICROPHENOS;
Replacement: PYRITE
ZEOLITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 700/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 856.00
Core: 61 Top of Core Depth (m) : 851.50
Sect: 3 Top of Section Depth(m): 855.20
LITHOLOGY: PLAG-CPX BASALT;
Piece No. : PCE 5A (75-100), 5B (100-110), 5C (110-138),
5B (138-147);
Texture : MEDIUM-GRAINED, EQUIGRANULAR;
Structure : IN PCE 5A MANY CHLORITE+PYRITE+ZEOLITE VEINS;
Alteration : SLIGHTLY
PCE 5A;
FRESH
PCE 5B;
Comments : THIS SECTION IS THE SAME UNIT AS IN SECTION 61-2;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1000 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 857.00
Core: 61 Top of Core Depth (m) : 851.50
Sect: 4 Top of Section Depth(m): 856.00
LITHOLOGY: PLAG-CPX BASALT;
SINGLE BASALT UNIT CONTINUED FROM PREVIOUS SECTION;
Piece No. : PCE 1A (0-25), 1B (26-52), 1C (50-70), 1D (65-84),
1E (83-100);
Texture : PCES 1A-1C ARE MEDIUM-GRAINED (EQUIGRANULAR), IN
PCES 1D+1E DECREASING GRAIN SIZE DOWNWARD FROM
MEDIUM TO FINE-GRAINED, AT THE BOTTOM OF PCE 1E IS A
CHILLED MARGIN AND IS FINE-GRAINED;
Structure : VEINS ARE FILLED WITH CHLORITE+PYRITE+ZEOLITE;
Alteration : FRESH
PCES 1A+1C-1E AND INTERVAL (45-52) OF PCE 1B ARE
FRESH;
Comments : ONE OF TWO BASALT UNITS IN THIS SECTION;
Groundmass : CLINOPYROXENE
PLAGIOCLASE
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 1000/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 857.50
Core: 61 Top of Core Depth (m) : 851.50
Sect: 4 Top of Section Depth(m): 857.00
LITHOLOGY: CPX SPARSELY MICROPHYRIC BASALT;
Piece No. : PCE 2 (103-120), 3 (123-150);
Texture : PCE 2 IS A CHILLED MARGIN AND IS FINE-GRAINED, IN
PCE 3 INCREASING GRAIN SIZE DOWNWARDS FROM SLIGHTLY
FINE-GRAINED TO SLIGHTLY MEDIUM-GRAINED WITH SPARSE
SPOTS OF CPX MICROPHENOS;
Structure : VEINS ARE FILLED WITH CHLORITE+PYRITE+ZEOLITE;
Alteration : FRESH
SLIGHTLY FRESH;
Comments : SINGLE BASALT UNIT;
Texture : SPARSELY MICROPHYRIC;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 859.00
Core: 61 Top of Core Depth (m) : 851.50
Sect: 5 Top of Section Depth(m): 857.50
LITHOLOGY: CPX PHYRIC BASALT;
Piece No. : PCE 1A (0-6), 1B (6-40), 1C (35-55), 1D (56-72),
1E (75-86), 2A (92-105), 2B (107-112), 3 (118-138),
4 (140-150);
Texture : PHYRIC, SLIGHTLY MEDIUM-GRAINED;
Structure : VEINS ARE FILLED WITH CHLORITE+ZEOLITE+PYRITE;
HOMOGENEOUS;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS PREVIOUS SECTION;
Phenocrysts: CLINOPYROXENE
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 300 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 859.30
Core: 61 Top of Core Depth (m) : 851.50
Sect: 6 Top of Section Depth(m): 859.00
LITHOLOGY: CPX PHYRIC BASALT;
Piece No. : PCE 1 (0-14), 2 (18-28);
Texture : PHYRIC, SLIGHTLY MEDIUM-GRAINED;
Structure : HOMOGENEOUS, VEINS ARE FILLED WITH CHLORITE+ZEOLITE+
PYRITE;
Alteration : SLIGHTLY;
Comments : CONTINUED FROM PREVIOUS SECTION;
Phenocrysts: CLINOPYROXENE
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 861.90
Core: 62 Top of Core Depth (m) : 860.50
Sect: 1 Top of Section Depth(m): 860.50
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 1A (0-17), 1B (18-27), 2B (101-140);
Texture : PCES 1A+1B ARE FINE-GRAINED, PCE 2B IS SLIGHTLY
MEDIUM-GRAINED;
Structure : PILLOW BASALT, VEINS ARE FILLED WITH CHLORITE+
ZEOLITE(PHIL)+PYRITE;
Alteration : SLIGHTLY;
Replacement: CHLORITE
ZEOLITE
PHIL;
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 861.90
Core: 62 Top of Core Depth (m) : 860.50
Sect: 1 Top of Section Depth(m): 860.50
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
Piece No. : PCE 1B (27-32), 1C (32-46), 1D (47-61), 1E (62-73),
1F (74-83);
Texture : SPARSELY PHYRIC, PCES 1B-1F ARE SLIGHTLY FINE-
GRAINED WITH SPARSE SPOTS OF CPX MICROPHENOS AND
APHANITIC GNDMASS, PCE 2A IS SLIGHTLY MEDIUM-
GRAINED AND EQUIGRANULAR WITH SPARSE SPOTS OF
CPX PHENOS;
Structure : VEINS ARE FILLED WITH CHLORITE+ZEOLITE(PHIL)+
PYRITE;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE ( <1%)
IN PCES 1B(27CM)-1F;
CLINOPYROXENE ( 1-3%)
CPX SPOTS IN PCE 2A;
Replacement: CHLORITE
ZEOLITE
PHIL
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 863.48
Core: 62 Top of Core Depth (m) : 860.50
Sect: 2 Top of Section Depth(m): 862.00
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 1A (1-36), 1B (37-46), 2E (130-132);
Texture : PCE 1A AND TOP OF PCE 1B (TO 46CM) IS SLIGHTLY
MEDIUM-GRAINED AND EQUIGRANULAR, BOTTOM OF 2E IS
FINE-GRAINED;
Structure : VEINS ARE FILLED WITH CHLORITE+PYRITE+ZEOLITE;
Comments : CONTINUED FROM PREVIOUS SECTION;
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 863.48
Core: 62 Top of Core Depth (m) : 860.50
Sect: 2 Top of Section Depth(m): 862.00
LITHOLOGY: CPX MICROPHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCE 1B (37-60), 1C (60-65), 2A (69-81),
2B (83-90), 2C (92-109), 2D (110-125), 2E (125-132),
2F (134-147);
Texture : MICROPHYRIC, BOTTOM OF PCE 1B (FROM 46CM) TO TOP OF
PCE 1C (TO 130) AND PCE 2A (FROM 73CM) TO PCE 2E
(TO 130CM) AND PCE 2F (FROM 137CM) TO BOTTOM OF PCE
2F ARE SLIGHTLY MEDIUM-GRAINED AND EQUIGRANULAR;
Structure : PILLOW BASALT, VEINS ARE FILLED WITH CHLORITE+
PYRITE+ZEOLITE;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
Replacement: PYRITE
ZEOLITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 863.48
Core: 62 Top of Core Depth (m) : 860.50
Sect: 2 Top of Section Depth(m): 862.00
LITHOLOGY: APHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCE 1C (60-65), 2A (69-81), 2F (134-147);
Texture : APHYRIC, BOTTOM OF PCE 1C (FROM 62CM) AND
TOP OF PCE 2A (TO 73CM) AND TOP OF PCE 2F ARE FINE-
GRAINED;
Structure : PILLOW BASALT, VEINS ARE FILLED WITH CHLORITE+
PYRITE+ZEOLITE;
Alteration : SLIGHTLY;
Replacement: PYRITE
ZEOLITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 864.98
Core: 62 Top of Core Depth (m) : 860.50
Sect: 3 Top of Section Depth(m): 863.50
LITHOLOGY: CPX MICROPHYRIC BASALT;
PILLOW BASALT;
Piece No. : PCE 1 (1-11), 2 (16-24), 3 (25-36), 4 (40-44),
5A (46-5), 5B (55-69), 5C (69-73), 5D (74-78),
5E (78-92), 6 (93-110), 7A (113-115), 7B (116-121),
7C (122-131), 8 (134-150);
Texture : MICROPHYRIC, PCES 1-3 ARE SLIGHTLY MEDIUM TO
SLIGHTLY FINE-GRAINED, PCE 4 IS FINE-GRAINED, TOP OF
PCE 5A IS A GLASSY CHILLED MARGIN, INTERVAL
(100-110) OF PCE 6 IS FINE-GRAINED, PCE 7B HAS A
LATERAL GLASSY CHILLED MARGIN, PCES 7C+8 ARE FINE-
GRAINED;
Structure : PILLOW BASALT, VEINS ARE FILLED WITH PYRITE+CHLORITE
+ZEOLITE, ZEOLITE VEIN OR CAVITY NOTED AT BOUNDARY
AT 47CM;
Alteration : SLIGHTLY;
Comments : CONTINUED FROM LOWER UNIT OF PREVIOUS SECTION;
Phenocrysts: CLINOPYROXENE
SPOTS OF CPX MICROPHENOS IN PCES 1-3, IN PCES 5A-
5C INCREASING GRAIN SIZE OF CPX MICROPHENOS, IN
PCES 5D-6 (TO 100CM) DECREASING GRAIN SIZE OF CPX
MICROPHENOS, IN PCES 7C+8 RARE SPOTS OF CPX
MICROPHENOS;
Replacement: CHLORITE
PYRITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/ 380 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 865.38
Core: 62 Top of Core Depth (m) : 860.50
Sect: 4 Top of Section Depth(m): 865.00
LITHOLOGY: PILLOW BASALT;
Piece No. : PCE 1 (0-35);
Texture : FINE-GRAINED WITH RARE SPOTS OF CPX MICROPHENOS
(<1MM), ONE RELATIVE LARGE PCE HAS A GLASSY MARGIN;
Structure : PILLOW BASALT, SMALL CRUSHED PARTICLES;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE
Size(mm): <1
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 866.00
Core: 63 Top of Core Depth (m) : 864.50
Sect: 1 Top of Section Depth(m): 864.50
LITHOLOGY: MICRODOLERITE;
Piece No. : PCE 1 (0-6), 2 (10-25), 3 (25-34), 4A (38-45),
4B (45-61), 4C (61-90), 4D (90-115), 5A (117-130),
5B (131-150);
Texture : GLASSY AND APHANITIC, MEDIUM-GRAINED IN MIDDLE OF
UNIT INTERVAL, FROM 35 TO 38CM IS AN ASH-LIKE
COARSE-GRAINED ROCK WITH COARSE CRYSTALS SURROUNDED
BY ALTERED APHANITIC MATERIAL;
Structure : PYRITE+CHLORITE+CLAY VEINS AND ZEOLITE VEINS ARE
PRESENT, FROM 10 TO 24CM ARE THIN DENDRITIC VEINS
OF FINE-GRAINED MORE XTALLINE MICRODOLERITES IN
APHANITIC ONES;
Comments : THREE UNITS-(0-25) AND (25-45) AND (45-150);
Vesicles : VESICULAR NEAR CONTACTS OF UNITS;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
Replacement: PYRITE
CHLORITE
CLAY MINERALS
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1010 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 867.01
Core: 63 Top of Core Depth (m) : 864.50
Sect: 2 Top of Section Depth(m): 866.00
LITHOLOGY: MICRODOLERITE;
SAME MICRODOLERITES AS ABOVE;
Piece No. : PCE 1A (0-15), 1B (15-35), 2 (36-47), 3 (50-62),
4A (65-75), 4B (75-81), 4C (81-100);
Structure : INTERVAL (65-80) THIN DENDRITIC VEINS OF FINE-
GRAINED MICRODOLERITES IN APHANITIC (QUENCHED) ROCKS
OF CHILLED MARGIN, PYRITE+CHLORITE+CLAY VEINS ARE
PRESENT;
Texture : CHILLED MARGIN;
Replacement: CHLORITE
PYRITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1420 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 870.92
Core: 64 Top of Core Depth (m) : 869.50
Sect: 1 Top of Section Depth(m): 869.50
LITHOLOGY: MASSIVE BASALT SILL;
CPX SPARSELY MICROPHYRIC BASALT;
Piece No. : PCE 1A (0-17), 1B (16-43), 1C (43-85), 1D (85-117),
1E (118-141);
Texture : SLIGHTLY MEDIUM-GRAINED, EQUIGRANULAR WITH SPARSE
SPOTS OF CPX MICROPHENOS (<1MM) IN APHANITIC
GNDMASS, LOWER PART SLIGHTY LESS CPX MICROPHYRIC
THAN UPPER PART;
Structure : HOMOGENEOUS MASSIVE BASALT, IN PCE 1A SOME VEINS ARE
FILLED WITH CHLORITE+ZEOLITE;
Alteration : FRESH;
Phenocrysts: CLINOPYROXENE
Size(mm): <1
SPARSE SPOTS OF CPX MICROPHENOS, LOWER PART IS
SLIGHTLY LESS MICROPHYRIC THAN UPPER PART;
Replacement: CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1270 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 872.27
Core: 64 Top of Core Depth (m) : 869.50
Sect: 2 Top of Section Depth(m): 871.00
LITHOLOGY: MASSIVE BASALT SILL;
PLAG-CPX SPARSELY MICROPHYRIC BASALT;
Piece No. : PCE 1A (0-25), 1B (25-59), 1C (60-115),
1D (115-127);
Texture : SLIGHTLY MEDIUM-GRAINED IN PCE 1A AND INCREASING
TO MEDIUM TO SLIGHTLY COARSE-GRAINED IN PCE 1D,
EQUIGRANULAR TO SUBOPHITIC;
Structure : MASSIVE BASALT SILL, IN PCES 1B+1C+1D VEINS ARE
FILLED WITH ZEOLITE+CHLORITE+PYRITE;
SLIGHTLY;
Comments : CONTINUED UNIT FROM PREVIOUS SECTION;
Phenocrysts: CLINOPYROXENE
PLAGIOCLASE
MICROPHENOS;
Groundmass : COMBINATION
INCLUDES PLAG+CPX+MAGN MICROLITES;
Replacement: ZEOLITE
CHLORITE
Minerals Replaced: CPX
PYRITE
CLAY MINERALS
Minerals Replaced: CPX
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 873.90
Core: 64 Top of Core Depth (m) : 869.50
Sect: 3 Top of Section Depth(m): 872.50
LITHOLOGY: MASSIVE BASALT SILL;
Piece No. : PCE 1A (0-40), 1B (40-59), 1C (60-69), 1D (70-79),
1E (79-84), 1F (84-100), 2 (104-130);
Texture : PCES 1A+1B ARE SLIGHTLY COARSE-GRAINED WITH SPARSE
SPOTS OF CPX PHENOS (1.0-1.5MM) AND ARE
INTERGRANULAR TO SUBOPHITIC, IN PCES 1C-2 DECREASING
GRAIN SIZE DOWNWARDS FROM SLIGHTLY COARSE TO MEDIUM-
GRAINED, THE SIZE OF CPX PHENOS SPOTS ARE LESS THAN
THAN OF THE UPPER SECTION (<1.0MM);
Structure : IN PCES 1B-1D VEINS ARE PREVALENT, VEINS ARE FILLED
BY CHLORITE+ZEOLITE+PYRITE, MASSIVE BASALT SILL;
Alteration : SLIGHTLY;
Comments : CONTINUED FROM PREVIOUS SECTION;
Phenocrysts: CLINOPYROXENE
Size(mm): 1.0-1.5
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 875.45
Core: 64 Top of Core Depth (m) : 869.50
Sect: 4 Top of Section Depth(m): 874.00
LITHOLOGY: MASSIVE BASALT SILL;
Piece No. : PCE 1A (1-20), 1B (22-35), 2A (37-50), 2B (50-52),
3 (55-65), 4A (67-73), 4B (75-81), 5 (86-101),
6A (106-132), 6B (134-145);
Texture : IN PCES 1A-1B DECREASING GRAIN SIZE DOWNWARDS FROM
SLIGHTLY MEDIUM TO FINE-GRAINED AND HAVE SPARSE
SPOTS OF CPX(<1MM), IN PCES 2A-6A(105CM) CPX
MICROPHENOS ARE PRESENT AND GRAIN SIZE IS INCREASING
DOWNWARD FROM SLIGHTLY FINE TO SLIGHTLY COARSE
GRAINED, IN PCES 6A(105CM)-6B CPX MICROPHENOS ARE
PRESENT AND DECREASING GRAIN SIZE FROM SLIGHTLY
COARSE TO MEDIUM-GRAINED;
Structure : MASSIVE BASALT SILL, VEINS ARE FILLED WITH PYRITE+
CHLORITE+ZEOLITE;
Alteration : SLIGHTLY;
Comments : TWO BASALT UNITS MAY OCCUR-(0-35) AND (35-150?),
INTERVAL (0-35) IS CONTINUED FROM 64-3;
Phenocrysts: CLINOPYROXENE
Size(mm): <1
Replacement: ZEOLITE
PYRITE
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 877.00
Core: 64 Top of Core Depth (m) : 869.50
Sect: 5 Top of Section Depth(m): 875.50
LITHOLOGY: MASSIVE BASALT;
Piece No. : PCE 1A (0-10), 1B (10-22), 1C (22-32), 1D (32-40),
2 (43-53), 3 (56-65), 4A (68-81), 4B (84-90),
4C (91-96), 4D (96-102), 4E (102-106), 4F (106-110),
5 (112-130), 6 (130-149);
Texture : PCES 1A-1D ARE DECREASING IN GRAIN SIZE FROM MEDIUM
TO FINE-GRAINED, TOP OF PCE 2 AND BOTTOM OF PCE 4F
ARE FINE-GRAINED, PCE 4B IS CORE OF THIS UNIT (43-
110) AND MEDIUM-GRAINED WITH SPARSE SPOTS OF CPX
MICROPHENOS (<1MM), PCE 5 IS MADE OF MANY SMALL
CRUSHED FINE-GRAINED PARTICLES, PCE 6 IS MEDIUM-
GRAINED WITH CPX MICROPHENOS;
Structure : MASSIVE BASALT, VEINS ARE FILLED WITH PYRITE+
CHLORITE+ZEOLITE;
Alteration : SLIGHTLY;
Comments : THREE BASALT UNITS EXIST-(0-40) AND (40-110) AND
(110-150?);
Phenocrysts: CLINOPYROXENE
Size(mm): <1
IN PCES 4B AND 6;
Replacement: PYRITE
CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 877.95
Core: 65 Top of Core Depth (m) : 876.50
Sect: 1 Top of Section Depth(m): 876.50
LITHOLOGY: DIABASE;
MASSIVE BASALT SILL;
Piece No. : PCE 1 (1-20), 2 (22-47), 3 (50-66), 4 (70-74),
5 (76-142);
Texture : MEDIUM-GRAINED DIABASE, SUBOPHITIC;
Structure : MASSIVE AND HOMOGENEOUS BASALT SILL, VEINS ARE
FILLED WITH CHLORITE (OR GREEN CLAY) AND PYRITE AND
ZEOLITE;
Alteration : SLIGHTLY
A FEW CLAY REPLACEMENT PATCHES ARE FOUND,
ALTERATION IS MAINLY OBVIOUS AS HEAVY VEINING;
Comments : BELONGS TO A SINGLE COOLING UNIT;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): <0.7
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
ALTERATIONS ARE IN GNDMASS;
Replacement: CHLORITE
OR CLAY;
PYRITE
ZEOLITE
Comments : NO LINER USED-ANY PCE MAY BE OUT OF STRATIGRAPHIC
ORDER OR MAY BE INCORRECTLY ORIENTED;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 879.48
Core: 65 Top of Core Depth (m) : 876.50
Sect: 2 Top of Section Depth(m): 878.00
LITHOLOGY: DIABASE;
MASSIVE BASALT SILL;
SAME AS PREVIOUS SECTION IN ALL RESPECTS;
Piece No. : PCE 1 (1-148);
Texture : MEDIUM-GRAINED DIABASE, SUBOPHITIC;
Structure : MASSIVE AND HOMOGENEOUS BASALT SILL, VEINS ARE
FILLED WITH CHLORITE (OR GREEN CLAY) AND PYRITE AND
ZEOLITE;
Alteration : SLIGHTLY
A FEW CLAY REPLACEMENT PATCHES ARE FOUND,
ALTERATION IS MAINLY OBVIOUS AS HEAVY VEINING;
Comments : BELONGS TO A SINGLE COOLING UNIT;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): <0.2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
ALTERATIONS ARE IN GNDMASS;
Replacement: CHLORITE
OR CLAY;
PYRITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1310 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 880.81
Core: 65 Top of Core Depth (m) : 876.50
Sect: 3 Top of Section Depth(m): 879.50
LITHOLOGY: DIABASE;
MASSIVE BASALT SILL;
SAME AS PREVIOUS SECTION IN ALL RESPECTS EXCEPT FOR
INCREASED ABUNDANCE OF VEINS;
Piece No. : PCE 1 (0-22), 2 (25-59), 3 (60-127);
Structure : MASSIVE BASALT SILL, HEAVY VEINING WITH LIGHT GREEN
CLAY AND PYRITE-VEINS UP TO 3MM THICK;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): <0.2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERALS
ALTERATIONS ARE IN GNDMASS;
Replacement: CHLORITE
OR CLAY;
PYRITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 884.45
Core: 66 Top of Core Depth (m) : 883.00
Sect: 1 Top of Section Depth(m): 883.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME PETROLOGY AND MINERALOGY AND VEINS AS 65-3;
Piece No. : PCE 1A (0-20), 1B (20-40), 1C (40-45),
1D (45-60), 1E (60-80), 1F (80-148);
Structure : MASSIVE DOLERITE SILL;
Alteration : SLIGHTLY;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 885.98
Core: 66 Top of Core Depth (m) : 883.00
Sect: 2 Top of Section Depth(m): 884.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS ABOVE;
Piece No. : PCE 1A (0-20), 1B (20-27), 1C (25-60), 1D (60-75),
1E (75-92), 1F (92-111), 1G (111-125),
1H (124-148);
Texture : DOLERITE, MEDIUM-GRAINED SUBOPHITIC;
Structure : MASSIVE DOLERITE SILL WITH CHLORITE+PYRITE+CLAY
VEINS;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 887.50
Core: 66 Top of Core Depth (m) : 883.00
Sect: 3 Top of Section Depth(m): 886.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS ABOVE;
Piece No. : PCE 1A (0-15), 1B (15-40), 1C (40-70), 1D (70-90),
1E (88-106), 1F (104-150);
Texture : MEDIUM-GRAINED SUBOPHITIC DOLERITE;
Structure : MASSIVE DOLERITE SILL WITH CHLORITE+PYRITE+CLAY
VEINS;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
Leg : 61 Top/Bottom Interval(mm): 0/1360 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 888.86
Core: 66 Top of Core Depth (m) : 883.00
Sect: 4 Top of Section Depth(m): 887.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS ABOVE EXCEPT INTERVAL (110-130) IS MORE FINE
GRAINED;
Piece No. : PCE 1A (0-15), 1B (16-35), 1C (35-61), 1D (61-85),
1E (85-106), 1F (107-131);
Texture : SAME EXCEPT INTERVAL (110-130) IS SLIGHTLY MORE FINE
GRAINED MICRODOLERITE;
Structure : MASSIVE DOLERITE SILL WITH CHLORITE+PYRITE+CLAY
VEINS;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
Replacement: CHLORITE
PYRITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1340 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 890.34
Core: 66 Top of Core Depth (m) : 883.00
Sect: 5 Top of Section Depth(m): 889.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS INTERVAL (110-130) OF SECTION 66-4;
Piece No. : PCE 1A (0-25), 1B (25-50), 1C (50-68), 1D (69-85),
1E (85-130);
Texture : SAME AS ABOVE, MICRODOLERITIC;
Structure : MASSIVE DOLERITE SILL WITH CHLORITE+PYRITE+CLAY
VEINS;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
Replacement: CHLORITE
PYRITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 892.00
Core: 66 Top of Core Depth (m) : 883.00
Sect: 6 Top of Section Depth(m): 890.50
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS SECTION 66-5;
Piece No. : PCE 1A (0-25), 1B (25-50), 1C (50-60), 1D (60-76),
1E (76-87), 1F (87-100), 1G (101-110), 1H (110-124),
1I (125-150);
Texture : SUBOPHITIC MICRODOLERITE, MEDIUM-GRAINED AS INTERVAL
(110-130) OF SECTION 66-4;
Structure : MASSIVE DOLERITE SILL WITH CHLORITE+PYRITE+CLAY
VEINS;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS 65-1;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
Replacement: CHLORITE
PYRITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/ 370 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 892.37
Core: 66 Top of Core Depth (m) : 883.00
Sect: 7 Top of Section Depth(m): 892.00
LITHOLOGY: MASSIVE DOLERITE SILL;
SAME AS ABOVE;
Piece No. : PCE 1A (0-12), 1B (14-37);
Texture : SUBOPHITIC MICRODOLERITE, MEDIUM-GRAINED AS IN
INTERVAL (110-130) OF SECTION 66-4;
Structure : MASSIVE DOLERITE SILL, VEINING OCCURS;
Alteration : SLIGHTLY
ALTERATION OCCURS AS HEAVY VEINING;
Comments : SAME UNIT AS 65-1;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
Replacement: CHLORITE
PYRITE
CLAY MINERALS
Leg : 61 Top/Bottom Interval(mm): 0/1310 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 893.31
Core: 67 Top of Core Depth (m) : 892.00
Sect: 1 Top of Section Depth(m): 892.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-8), 1B (9-13), 1C (14-61), 1D (61-86),
1E (85-110), 1F (110-129);
Texture : A FEW (<1%) PHENOS OF CPX IN A COARSE-GRAINED
DIABASE MATRIX;
Structure : MASSIVE DOLERITE SILL, A RATHER THICK SILL, VEINS
CONSIST OF GREEN AND WHITE CLAY (NO PYRITE OR
CALCITE OR ZEOLITE AS BEFORE);
Alteration : SLIGHTLY
ALTERATION CONSISTS OF CLAY PATCHES IN THE ROCK
AS WELL AS VEINS;
Comments : STILL PART OF THE SAME UNIT;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
ALTERATION PRODUCTS IN GNDMASS;
Replacement: CLAY
GREEN AND WHITE;
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 894.95
Core: 67 Top of Core Depth (m) : 892.00
Sect: 2 Top of Section Depth(m): 893.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-40), 1B (40-91), 1C (91-114),
1D (110-145);
Texture : A FEW (<1%) PHENOS OF CPX IN A COARSE-GRAINED
DIABASE MATRIX;
Structure : MASSIVE DOLERITE SILL, A RATHER THICK SILL, VEINS
CONSIST OF GREEN AND WHITE CLAY (NO PYRITE OR
CALCITE OR ZEOLITE AS BEFORE);
Alteration : SLIGHTLY
ALTERATION CONSISTS OF CLAY PATCHES IN THE ROCK
AS WELL AS VEINS;
Comments : STILL PART OF THE SAME UNIT AS SECTION 67-1;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
ALTERATION PRODUCTS IN GNDMASS;
Replacement: CLAY
GREEN AND WHITE;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 896.50
Core: 67 Top of Core Depth (m) : 892.00
Sect: 3 Top of Section Depth(m): 895.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-11), 1B (11-37), 1C (37-87), 1D (86-150);
Texture : A FEW (<1%) PHENOS OF CPX IN A COARSE-GRAINED
DIABASE MATRIX;
Structure : MASSIVE DOLERITE SILL, A RATHER THICK SILL, VEINS
CONSIST OF GREEN AND WHITE CLAY (NO PYRITE OR
CALCITE OR ZEOLITE AS BEFORE);
Alteration : SLIGHTLY
ALTERATION CONSISTS OF CLAY PATCHES IN THE ROCK
AS WELL AS VEINS;
Comments : SAME UNIT AS SECTION 67-1;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): .2
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
ALTERATION PRODUCTS IN GNDMASS;
Replacement: CLAY
GREEN AND WHITE;
Leg : 61 Top/Bottom Interval(mm): 0/1460 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 897.96
Core: 67 Top of Core Depth (m) : 892.00
Sect: 4 Top of Section Depth(m): 896.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-23), 1B (25-36), 1C (36-68), 1D (65-117),
1E (117-122), 1F (120-145);
Texture : A FEW (<1%) PHENOS OF CPX IN A COARSE-GRAINED
DIABASE MATRIX;
Structure : MASSIVE DOLERITE SILL, A RATHER THICK SILL, VEINS
CONSIST OF GREEN AND WHITE CLAY (NO PYRITE OR
CALCITE OR ZEOLITE AS BEFORE);
Alteration : SLIGHTLY
ALTERATION CONSISTS OF CLAY PATCHES IN THE ROCK
AS WELL AS VEINS;
Comments : SAME UNIT AS SECTION 67-1;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): 0.2-0.6
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
ALTERATION PRODUCTS IN GNDMASS;
Replacement: CLAY
GREEN AND WHITE;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 899.48
Core: 67 Top of Core Depth (m) : 892.00
Sect: 5 Top of Section Depth(m): 898.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-44), 1B (44-62), 1C (62-81), 1D (81-110),
1E (110-120), 1F (121-148);
Texture : A FEW (<1%) PHENOS OF CPX IN A COARSE-GRAINED
DIABASE MATRIX;
Structure : MASSIVE DOLERITE SILL, A RATHER THICK SILL, VEINS
CONSIST OF GREEN AND WHITE CLAY (NO PYRITE OR
CALCITE OR ZEOLITE AS BEFORE);
Alteration : SLIGHTLY
ALTERATION CONSISTS OF CLAY PATCHES IN THE ROCK
AS WELL AS VEINS;
Comments : SAME UNIT AS SECTION 67-1;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): 0.2-0.6
Groundmass : PLAGIOCLASE
CLINOPYROXENE
OPAQUE MINERAL
ALTERATION PRODUCTS IN GNDMASS;
Replacement: CLAY
GREEN AND WHITE;
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 900.90
Core: 67 Top of Core Depth (m) : 892.00
Sect: 6 Top of Section Depth(m): 899.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-6), 1B (6-17), 1C (17-30), 1D (30-52),
1E (48-72), 1F (71-83), 1G (79-102), 1H (101-116),
1I (117-140);
Texture : A FEW (<1%) PHENOS OF CPX IN A COARSE-GRAINED
DOLERITE MATRIX;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH GREEN
AND WHITE CLAY;
Alteration : SLIGHTLY
ALTERATION CONSISTS OF CLAY PATCHES IN THE ROCK
AND IN VEINS;
Comments : SAME UNIT AS SECTION 67-1;
Phenocrysts: CLINOPYROXENE ( <1%)
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MAGNETITE
ALTERATION PRODUCTS ARE IN GNDMASS;
Replacement: CLAY
GREEN AND WHITE CLAY;
Leg : 61 Top/Bottom Interval(mm): 0/ 800 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 901.80
Core: 67 Top of Core Depth (m) : 892.00
Sect: 7 Top of Section Depth(m): 901.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (1-23), 1B (24-44), 1C (44-52), 1D (52-70),
1E (70-78);
Texture : A FEW (<1%) PHENOS OF CPX IN A COARSE-GRAINED
DOLERITE MATRIX;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH GREEN
AND WHITE CLAY;
Alteration : SLIGHTLY
ALTERATION CONSISTS OF CLAY PATCHES IN THE ROCK
AND IN VEINS;
Comments : SAME UNIT AS SECTION 67-1;
Phenocrysts: CLINOPYROXENE ( <1%)
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MAGNETITE
ALTERATION PRODUCTS ARE IN GNDMASS;
Replacement: CLAY
GREEN AND WHITE CLAY;
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 902.40
Core: 68 Top of Core Depth (m) : 901.00
Sect: 1 Top of Section Depth(m): 901.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-10), 1B (11-35), 1C (35-59), 1D (60-90),
1E (90-125), 1F (125-140);
Texture : SUBOPHITIC TO INTERGRANULAR MEDIUM TO SLIGHTLY
COARSE-GRAINED;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE
Size(mm): <1
OFTEN FORMS AGGREGATES;
PLAGIOCLASE
Size(mm): <1
Groundmass : CLINOPYROXENE
PLAGIOCLASE
MAGNETITE
MICROLITES;
Replacement: CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1120 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 903.62
Core: 68 Top of Core Depth (m) : 901.00
Sect: 2 Top of Section Depth(m): 902.50
LITHOLOGY: MASSIVE DOLERITE SILL;
CONTINUED FROM PREVIOUS SECTION;
Piece No. : PCE 1A (0-59), 1B (59-69), 1C (70-82), 1D (82-110);
Texture : IN PCES 1A-1D DECREASING GRAIN SIZE DOWNWARD FROM
SLIGHTLY COARSE TO MEDIUM-GRAINED (INTERSERTAL TO
SUBOPHITIC), IN PCE 1D GRAIN SIZE ABRUPTLY CHANGES
TO FINE WITH SPARSE SPOTS OF CPX MICROPHENOS (1.0-
1.5MM) (HYALOPILITIC), THE BOTTOM OF PCE 1D IS FINE-
GRAINED;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED MAINLY BY
CHLORITE;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 68-1;
Phenocrysts: CLINOPYROXENE
Size(mm): 1.0-1.5
SPARSE SPOTS OF CPX MICROPHENOS;
Replacement: CHLORITE
FILLING VEINS;
Leg : 61 Top/Bottom Interval(mm): 1120/1360 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 903.86
Core: 68 Top of Core Depth (m) : 901.00
Sect: 2 Top of Section Depth(m): 903.62
LITHOLOGY: DOLERITE BRECCIA;
Piece No. : PCE 2 (115-135);
Texture : FINE-GRAINED BRECCIATED DOLERITE PARTICLES;
Alteration : SLIGHTLY;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 905.50
Core: 68 Top of Core Depth (m) : 901.00
Sect: 3 Top of Section Depth(m): 904.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (1-10), 2A (15-25), 2B (25-35), 2C (35-41),
2D (43-50), 2E (50-65), 3 (68-75), 4 (77-105),
5 (108-126), 6 (130-150);
Texture : PCE 1 IS SLIGHTLY FINE-GRAINED, PCE 2A IS MEDIUM-
GRAINED, PCE 2B IS FINE-GRAINED BUT ALTERED, PCES
2C+2D ARE SLIGHTLY FINE-GRAINED, IN PCES 2E-4 GRAIN
SIZE INCREASES FROM SLIGHTLY FINE-GRAINED TO MEDIUM-
GRAINED, IN PCES 4-6 GRAIN SIZE DECREASES;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED MAINLY BY
CHLORITE (RARE PYRITE);
Alteration : SLIGHTLY;
Replacement: CHLORITE
PYRITE
RARE, IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 907.00
Core: 68 Top of Core Depth (m) : 901.00
Sect: 4 Top of Section Depth(m): 905.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (0-5), 2A (8-18), 2B (19-26), 3 (30-43),
4A (45-53), 4B (54-75), 5A (77-95), 5B (95-100),
6 (103-114), 7 (115-135), 8 (138-150);
Texture : PCE 1 IS CONTINUED FROM PREVIOUS SECTION AND FINE-
GRAINED WITH CPX MICROPHENOS (<1MM), PCES 2A-2B ARE
FINE-GRAINED, IN PCES 3-8 GRAIN SIZE INCREASES
DOWNWARD FROM SLIGHTLY MEDIUM-GRAINED TO SLIGHTLY
COARSE-GRAINED;
Structure : MASSIVE DOLERITE SILL WITH CHLORITE+PYRITE VEINS;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 68-3;
Phenocrysts: CLINOPYROXENE
Size(mm): <1
IN PCE 1;
Replacement: CHLORITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1300 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 908.30
Core: 68 Top of Core Depth (m) : 901.00
Sect: 5 Top of Section Depth(m): 907.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (1-10), 2A (12-38), 2B (39-67), 3 (70-101),
4 (105-130);
Texture : SLIGHTLY DECREASING GRAIN SIZE DOWNWARD FROM
SLIGHTLY COARSE TO MEDIUM-GRAINED, THE MEDIUM-
GRAINED PCE IS EQUIGRANULAR;
Structure : MASSIVE DOLERITE SILL WITH CHLORITE VEINS;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS PREVIOUS SECTION;
Replacement: CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/ 450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 908.95
Core: 68 Top of Core Depth (m) : 901.00
Sect: 6 Top of Section Depth(m): 908.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (0-13), 2 (15-25), 3 (25-29), 4 (30-43);
Texture : PCE 1 IS MEDIUM-GRAINED, PCES 2+3 ARE SLIGHTLY FINE-
GRAINED, PCE 4 IS SLIGHTLY FINE-GRAINED;
Structure : MASSIVE DOLERITE SILL, PCE 4 CONSISTS OF SMALL
CRUSHED PARTICLES, POSSIBLE SILL BOUNDARY AT 44CM;
Alteration : SLIGHTLY;
Leg : 61 Top/Bottom Interval(mm): 0/1310 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 911.31
Core: 69 Top of Core Depth (m) : 910.00
Sect: 1 Top of Section Depth(m): 910.00
LITHOLOGY: MICRODOLERITE SILLS;
Piece No. : PCE 1A (0-5), 1B (5-8), 2 (11-20), 3A (24-35),
3B (37-50), 4A (52-65), 4B (65-72), 5A (74-76),
5B (77-82), 5C (82-87), 6 (71-106), 7 (109-115),
8 (119-130);
Texture : FINE-GRAINED TO GLASSY NEAR CONTACTS, MEDIUM-GRAINED
IN SILL INTERIOR;
Structure : SILL, CHLORITE-CLAY VEINS;
Alteration : EXT
HEAVILY ALTERED NEAR VEINS;
Comments : THREE UNITS, INTERVALS (0-9) AND (10-72) AND
(74-130);
Replacement: CHLORITE
CLAY
Leg : 61 Top/Bottom Interval(mm): 0/1250 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 912.75
Core: 69 Top of Core Depth (m) : 910.00
Sect: 2 Top of Section Depth(m): 911.50
LITHOLOGY: MICRODOLERITE SILLS;
Piece No. : PCE 1 (0-10), 2A (14-20), 2B (20-25), 2C (25-30),
3 (35-38), 4 (40-50), 5 (52-65), 6A (69-75),
6B (75-82), 6C (81-91), 7 (92-125);
Texture : IN INTERVAL (65-120) ARE SMALL PCES OF FINE-GRAINED
MICRODOLERITES;
Structure : INTERVAL (0-65) IS THE BOTTOM OF SILL FROM SECTION
69-1, CHLORITE+CLAY VEINS;
Alteration : EXT;
Replacement: CHLORITE
CLAY
Leg : 61 Top/Bottom Interval(mm): 0/ 970 Analyst: Shcheka, S.A.
Hole: 462A Sample Midpoint (m) : 913.97
Core: 69 Top of Core Depth (m) : 910.00
Sect: 3 Top of Section Depth(m): 913.00
LITHOLOGY: MICRODOLERITE;
SILL;
Piece No. : PCE 1A (0-10), 2 (11-20), 3 (24-45), 4A (48-52),
4B (54-65), 4C (65-72), 4D (73-76), 5A (80-90),
5B (90-95);
Texture : FINE-GRAINED TO APHANITIC AND GLASSY NEAR CONTACTS,
MEDIUM-GRAINED IN SILL INTERIORS;
Structure : SILL, VEINS FILLED WITH CHLORITE AND CLAY;
Alteration : EXT;
Comments : TWO UNITS-INTERVALS (0-22) AND (22-95);
Replacement: CLAY
CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/ 250 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 919.25
Core: 70 Top of Core Depth (m) : 919.00
Sect: 1 Top of Section Depth(m): 919.00
LITHOLOGY: HYALOCLASTITE AND HYALOCLASTITE BRECCIA;
SEE SEDIMENT VISUAL DESCRIPTIONS (MAY BE CAVINGS);
Piece No. : PCE 1 (0-25);
Leg : 61 Top/Bottom Interval(mm): 250/1500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 920.50
Core: 70 Top of Core Depth (m) : 919.00
Sect: 1 Top of Section Depth(m): 919.25
LITHOLOGY: APHANITIC BASALT;
Piece No. : PCE 2 (26-35), 3 (38-71), 4 (73-75), 5 (78-98),
6 (100-121), 7 (124-136), 8 (139-148);
Texture : GLASSY TO FINE-GRAINED, INTERIOR PORTIONS OF FLOW
UNITS ARE MORE COARSE-GRAINED WITH A PHANERITIC
MATRIX;
Alteration : A FEW CLAY SPOTS ARE ALSO VISIBLE IN THE MORE
PHANERITIC FRAGMENTS;
Comments : UNIT BOUNDARY IN PCE 2, POSSIBLE UNIT BOUNDARY AT
100CM INDICATED BY FINER GRAINED BOTTOM OF FRAGMENT
5B HOWEVER THE FINE-GRAINED APOPHYSES INDICATE THAT
THIS COULD BE A GRAIN SIZE HETEROGENEITY WITHIN A
SINGLE UNIT;
Replacement: CLAY
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 922.00
Core: 70 Top of Core Depth (m) : 919.00
Sect: 2 Top of Section Depth(m): 920.50
LITHOLOGY: APHYRIC BASALT;
Piece No. : PCE 1 (1-29), 2 (31-41), 3 (44-149);
Texture : APHYRIC, A FEW SMALL CPX PHENOS ARE VISIBLE, FINE-
GRAINED APOPHYSES IN MEDIUM-GRAINED PCE, GRAIN
SIZE INCREASES GRADUALLY THROUGH THIS SECTION, THE
MIDDLE AND BOTTOM PORTIONS ARE PHANERITIC;
Alteration : SLIGHTLY
SPOTS OF CLAY AND CHALC AND PYRITE;
Comments : PROBABLE UNIT BOUNDARY AT 135CM;
Phenocrysts: CLINOPYROXENE ( RARE%)
Replacement: CHALCEDONY
PYRITE
CLAY
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 923.49
Core: 70 Top of Core Depth (m) : 919.00
Sect: 3 Top of Section Depth(m): 922.00
LITHOLOGY: BASALT FRAGMENTS;
Piece No. : PCE 1 (0-18), 2 (20-132), 3 (135-148);
Texture : GRAIN SIZE VARIATIONS ARE RATHER FREQUENT AND
WITHOUT APPARENT PATTERN;
Comments : SEVERAL OF THE FRAGMENTS IN THIS SECTION ARE OUT OF
STRATIGRAPHIC ORDER, EACH HANDFUL WAS PLACED IN
POSITION AS IT WAS WITHDRAWN FROM THE LINERLESS CORE
BARREL BUT WITHIN EACH HANDFUL THERE IS NO RELATIVE
STRATIGRAPHIC POSITION INFORMATION AVAILABLE, A
FEW INDIVIDUAL UNITS ARE REPRESENTED-(0-20) AND
(20-63) AND (63-150), THE UNIT BOUNDARY AT 20CM IS
UNCERTAIN;
Alteration : MANY OF THE FRAGMENTS HAVE ABUNDANT CHALC AND
ZEOLITE AND GREEN CLAY AND PYRITE ALTERATION
SPOTS;
Replacement: CHALCEDONY
ZEOLITE
PYRITE
CLAY
GREEN CLAY;
Leg : 61 Top/Bottom Interval(mm): 0/ 250 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 923.75
Core: 70 Top of Core Depth (m) : 919.00
Sect: 4 Top of Section Depth(m): 923.50
LITHOLOGY: MEDIUM-GRAINED BASALT;
Piece No. : PCE NO PCE NUMBERS ASSIGNED, INTERVAL (0-24);
Texture : MEDIUM-GRAINED, SUB-PHANERITIC BASALT WITH PATCHY
TEXTURE TYPICAL OF THE FLOW UNITS, FINE-GRAINED
APOPLYSES IN MEDIUM-GRAINED BASALT;
Leg : 61 Top/Bottom Interval(mm): 0/ 750 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 928.75
Core: 71 Top of Core Depth (m) : 928.00
Sect: 1 Top of Section Depth(m): 928.00
LITHOLOGY: BASALT+BASALTIC BRECCIA+POSSIBLE HYALOCLASTITE
ALTERED PILLOW BRECCIA;
Piece No. : PCE 1 (1-5), 2 (9-12), 3 (15-20), 4 (25-29),
5 (33-38), 6 (42-54), 7 (57-65), 8 (70-74);
Texture : IN PCE 5 APHANITIC FRAGMENTS IN GREEN ALTERED BASALT
MATRIX, IN PCE 6 LIGHT GRAY APHANITIC FRAGMENTS
AND LIGHT GRAY APHANITIC ZONE AND LIGHT GREEN
ALTERED ZONE AND COARSE GRAINED BASALT WITH MANY
PYRITE+CALCITE+CLAY BLOTCHES, PCE 8 IS MADE UP OF
1)PYRITE+CA+CLAY ALTERATION POCKET 2)DARK GRAY
APHANITIC BASALT 3)LIGHT GRAY SLIGHTLY MORE
CRYSTALLINE BASALT(?) AND 4)LIGHT GREEN ALTERED
BASALT WITH CLAY VEINLETS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 932.50
Core: 72 Top of Core Depth (m) : 931.00
Sect: 1 Top of Section Depth(m): 931.00
LITHOLOGY: PLAG-CPX MICROPHYRIC BASALT;
Piece No. : MASSIVE BASALT;
PCE 1 (1-10), 2A (14-17), 2B (17-25), 2C (25-27),
3 (30-40), 4 (44-51), 5 (55-69), 6A (72-77),
6B (77-90), 7A (72-106), 7B (107-112), 7C (112-120),
7D (121-129), 7E (129-140), 7F (140-145),
7G (145-150);
Texture : MICROPHYRIC, MEDIUM TO SLIGHTLY COARSE-GRAINED,
SUBOPHITIC TO INTERGRANULAR;
Structure : HOMOGENENEOUS MASSIVE BASALT, VEINS ARE FILLED BY
CHLORITE;
Alteration : SLIGHTLY
SLIGHTLY FRESH;
Phenocrysts: PLAGIOCLASE
Size(mm): 1
CLINOPYROXENE
Size(mm): 1
MAGNETITE
Size(mm): 1
MAGN ID UNCERTAIN;
Groundmass : PLAGIOCLASE
CLINOPYROXENE
MAGNETITE
MICROLITES;
Replacement: CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 934.00
Core: 72 Top of Core Depth (m) : 931.00
Sect: 2 Top of Section Depth(m): 932.50
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
Piece No. : PCE 1 (0-9), 2 (11-22), 3 (25-36), 4A (38-48),
4B (50-59), 4C (59-65), 5 (69-112), 6A (114-122),
6B (122-130), 7 (131-150);
Texture : INTERVAL (0-78) IS SLIGHTLY COARSE-GRAINED(OPHITIC
TO INTERGRANULAR), INTERVAL (78-88) DECREASING
GRAIN SIZE DOWNWARD TO SLIGHTLY FINE (HYALOPILITIC),
INTERVAL (88-92) IS FINE-GRAINED AND WITH CHILLED
MARGIN WITH SPARSE CPX MICROPHENOS (APHYRIC),
INTERVAL (92-95) IS SLIGHTLY FINE-GRAINED WITH
SPARSE CPX MICROPHENOS, INTERVAL (95-150) IS
SLIGHTLY COARSE-GRAINED TO MEDIUM;
Structure : MASSIVE SILL;
Alteration : SLIGHTLY;
Phenocrysts: CLINOPYROXENE
FEW, IN CHILLED MARGIN IN INTERVAL (88-92) AND
IN INTERVAL (92-95);
Leg : 61 Top/Bottom Interval(mm): 0/ 850 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 934.85
Core: 72 Top of Core Depth (m) : 931.00
Sect: 3 Top of Section Depth(m): 934.00
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
CONTINUED FROM SECTION 72-2;
Piece No. : PCE 1 (0-5), 2 (5-28), 3 (20-28), 4A (30-40),
4B (40-45), 5 (48-62), 6 (65-70), 7 (71-84);
Texture : SLIGHTLY COARSE-GRAINED;
Structure : MASSIVE BASALT SILL;
Alteration : SLIGHTLY;
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 938.45
Core: 73 Top of Core Depth (m) : 937.00
Sect: 1 Top of Section Depth(m): 937.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-9), 1B (6-15), 1C (15-27), 1D (28-35),
1E (35-50), 1F (51-70), 1G (70-81), 1H (82-90),
1I (90-100), 1J (102-110), 1K (110-122),
1L (120-130), 2 (133-145);
Texture : SLIGHTLY COARSE TO COARSE-GRAINED, OPHITIC TO
EQUIGRANULAR, THIS DOLERITE IS COMPOSED OF PHENOS OF
PLAG AND CPX AND SOME MAGN;
Structure : MASSIVE DOLERITE SILL, VEINS ARE FILLED WITH
CHLORITE AND ZEOLITE;
Alteration : SLIGHTLY;
Phenocrysts: PLAGIOCLASE
CLINOPYROXENE
Groundmass : MAGNETITE
PLAGIOCLASE
CLINOPYROXENE
Replacement: CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1490 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 939.99
Core: 73 Top of Core Depth (m) : 937.00
Sect: 2 Top of Section Depth(m): 938.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (1-10), 2A (13-21), 2B (24-30), 3 (33-45),
4A (48-53), 4B (54-57), 4C (48-65), 5 (69-77),
6A (80-85), 6B (85-93), 7 (95-116), 8 (120-130),
9A (134-140), 9B (140-143), 9C (145-149);
Texture : SLIGHTLY COARSE TO COARSE-GRAINED;
Structure : MASSIVE DOLERITE SILL;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS PREVIOUS SECTION;
Leg : 61 Top/Bottom Interval(mm): 0/ 600 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 940.60
Core: 73 Top of Core Depth (m) : 937.00
Sect: 3 Top of Section Depth(m): 940.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (0-7), 2 (12-15), 3A (18-23), 3B (24-27),
4 (30-34), 5 (36-45), 6 (46-60);
Texture : IN PCE 1 SMALL CRUSHED PARTICLES ARE COARSE TO
SLIGHTLY COARSE-GRAINED, PCE 2 IS COARSE TO SLIGHTLY
COARSE-GRAINED, PCE 3A IS COARSE-GRAINED WITH
MEGACRYSTS OF CPX (3-4MM)-THE MARGINS OF THESE
CRYSTALS ARE REPLACED TO CLAY MINERALS, PCES 4+5 ARE
SLIGHTLY MEDIUM-GRAINED, PCE 6 IS MEDIUM-GRAINED;
Structure : MASSIVE DOLERITE SILL;
Alteration : SLIGHTLY;
Comments : POSSIBLE BOUNDARY AT 28CM;
Phenocrysts: CLINOPYROXENE
Size(mm): 3-4
CRYSTAL MARGINS ARE ALTERED TO A CLAY MINERAL;
Replacement: CLAY MINERALS
Minerals Replaced: CPX
Leg : 61 Top/Bottom Interval(mm): 0/1420 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 947.42
Core: 74 Top of Core Depth (m) : 946.00
Sect: 1 Top of Section Depth(m): 946.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-10), 1B (12-20), 1C (21-34), 1D (35-60),
1E (60-76), 1F (76-85), 1G (84-92), 1H (92-95),
1I (95-106), 1J (107-115), 1K (115-125),
1L (125-135), 1M (135-141);
Texture : PCES 1A-1M ARE MEDIUM-GRAINED WITH RARE MICROPHENOS
OF CPX (SUBOPHITIC TO INTERSERTAL);
Structure : MASSIVE DOLERITE SILL, IN PCES 1D+1E VEINS OF
ZEOLITE+CHLORITE+PYRITE+MAGN(SMALL AMOUNT);
Alteration : SLIGHTLY
IN PCES 1D+1E ARE ALTERATION PATCHES OF THE SAME
VEIN MATERIAL;
Phenocrysts: CLINOPYROXENE ( RARE%)
Replacement: ZEOLITE
CHLORITE
PYRITE
MAGNETITE
SMALL AMOUNTS OF MAGN;
Leg : 61 Top/Bottom Interval(mm): 0/1470 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 948.97
Core: 74 Top of Core Depth (m) : 946.00
Sect: 2 Top of Section Depth(m): 947.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-15), 1B (15-20), 1C (20-48), 1D (49-72),
1E (73-106), 1F (107-146);
Texture : PCE 1A IS MEDIUM-GRAINED, PCES 1B-1F ARE MEDIUM TO
SLIGHTLY COARSE-GRAINED (OPHITIC TO INTERGRANULAR);
Structure : MASSIVE DOLERITE SILL WITH VEINS FILLED WITH
CHLORITE AND ZEOLITE;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 74-1;
Replacement: CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1250 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 950.25
Core: 74 Top of Core Depth (m) : 946.00
Sect: 3 Top of Section Depth(m): 949.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-12), 1B (15-40), 1C (60-63), 1D (65-87),
1E (87-105), 1F (105-122);
Texture : SLIGHTLY COARSE-GRAINED;
Structure : MASSIVE DOLERITE SILL WITH VEINS OF CHLORITE AND
ZEOLITE;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 74-2;
Leg : 61 Top/Bottom Interval(mm): 0/1470 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 951.97
Core: 74 Top of Core Depth (m) : 946.00
Sect: 4 Top of Section Depth(m): 950.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-28), 1B (29-50), 1C (50-84), 1D (85-115),
1E (115-138), 1F (138-141), 1G (142-145);
Texture : PCES 1B-1G ARE SLIGHTLY COARSE-GRAINED;
Structure : MASSIVE DOLERITE SILL, IN PCE 1A INTERVAL (22-27)
GRANOPHYRE SCHLIEREN;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 74-3;
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 953.45
Core: 74 Top of Core Depth (m) : 946.00
Sect: 5 Top of Section Depth(m): 952.00
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1A (0-15), 1B (14-27), 1C (27-32), 1D (31-50),
1E (50-56), 1F (57-70), 1G (70-77), 1H (78-90),
1I (91-107), 1J (128), 2 (120-130), 3 (130-145);
Texture : SLIGHTLY COARSE-GRAINED;
Structure : MASSIVE DOLERITE SILL, CHLORITE AND ZEOLITE VEINS;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 74-4;
Replacement: CHLORITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/ 150 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 953.65
Core: 74 Top of Core Depth (m) : 946.00
Sect: 6 Top of Section Depth(m): 953.50
LITHOLOGY: MASSIVE DOLERITE SILL;
Piece No. : PCE 1 (0-13);
Texture : SLIGHTLY COARSE-GRAINED;
Structure : MASSIVE DOLERITE SILL;
Alteration : SLIGHTLY;
Comments : SAME UNIT AS SECTION 74-5;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 954.50
Core: 75 Top of Core Depth (m) : 953.00
Sect: 1 Top of Section Depth(m): 953.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (5-10), 2A (13-25), 2B (25-32), 3A (33-43),
3B (39-46), 4 (48-67), 5A (70-80), 5B (74-87),
5C (83-120), 5D (115-132), 5E (126-140),
5F (140-150);
Texture : HOLOXTALLINE MEDIUM-GRAINED DIABASIC(?) GNDMASS,
MICROPHENOS OF PYX AND PLAG;
Structure : JOINTS ARE LINED WITH DARK GREENISH BLACK
CHLORITE(?), SECTION OF ROCK IS MEGASCOPICALLY
HOMOGENEOUS;
Alteration : SLIGHTLY;
Comments : COLOR IS N5 GRAY;
Phenocrysts: PLAGIOCLASE
PYROXENE
MICROPHENOS;
Replacement: CHLORITE
DARK GREENISH BLACK, ID UNCERTAIN;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 956.00
Core: 75 Top of Core Depth (m) : 953.00
Sect: 2 Top of Section Depth(m): 954.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (2-10), 1B (5-16), 1C (15-42), 1D (41-51),
1E (41-65), 1F (65-77), 2 (80-92), 3 (94-100),
4A (102-120), 4B (120-147);
Texture : PYX AND PLAG MICROPHENOS IN A HOLOXTALLINE MEDIUM-
GRAINED GNDMASS, NO SIGNIFICANT TEXTURAL VARIATIONS;
Structure : JOINTS FREQUENTLY COATED WITH SLICKENSIDES AND A
GREENISH-BLACK COATING, MEGASCOPICALLY HOMOGENEOUS;
Alteration : SLIGHTLY
VERY SLIGHT ALTERATION, PERHAPS WEATHERING;
Comments : COLOR IS N5 GRAY;
Phenocrysts: PLAGIOCLASE
PYROXENE
MICROPHENOS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 957.50
Core: 75 Top of Core Depth (m) : 953.00
Sect: 3 Top of Section Depth(m): 956.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (3-6), 1B (4-10), 1C (10-22), 2 (25-47),
3A-3E (49-60), 4A (61-80), 4B (75-97), 4C (97-106),
4D (106-115), 5 (115-140);
Texture : PYX AND FELDSPAR (LATHS) MICROPHENOS IN A
HOLOXTALLINE MEDIUM-GRAINED DIABASIC (?) GNDMASS;
Structure : HOMOGENEOUS ROCK WITH RARE VEINS (THIN LAYERS ON
JOINTS), MOST BREAKS ARE ALONG THESE VEINS;
Alteration : SLIGHTLY;
Comments : COLOR IS N5 GRAY, PCE 5 PLACED IN SHRINK TUBING FOR
CUTTING (MAY AFFECT MAGNETIC STUDIES);
Phenocrysts: FELDSPAR
PYROXENE
MICROPHENOS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 959.00
Core: 75 Top of Core Depth (m) : 953.00
Sect: 4 Top of Section Depth(m): 957.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (2-24), 2 (25-35), 3 (36-45), 4A (47-55),
4B (55-75), 5A (78-80), 5B (80-102), 5C (102-127),
6A (131-143), 6B (143-150);
Texture : MICROPHENOS OF PYX AND PLAG IN A HOLOXTALLINE MEDIUM
GRAINED GNDMASS;
Structure : JOINTING IS IRREGULAR BUT MORE COMMON THAN IN
SECTIONS 1-3,MOST JOINTS LINED BY PALE GREEN FIBROUS
MATERIAL, TEXTURE IS MEGASCOPICALLY HOMOGENEOUS
THROUGHOUT;
Alteration : SLIGHTLY
PARTICULARLY ALONG JOINTS;
Comments : COLOR N5 GRAY, PCES 1+4B+5C WERE PUT IN SHRINK
TUBING FOR CUTTING, MAY AFFECT PALEOMAGNETICS;
Phenocrysts: PLAGIOCLASE
PYROXENE
MICROPHENOS;
Replacement: PALE GREEN FIBROUS MINERAL LINING JOINTS;
Leg : 61 Top/Bottom Interval(mm): 0/1440 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 960.44
Core: 75 Top of Core Depth (m) : 953.00
Sect: 5 Top of Section Depth(m): 959.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (1-20), 2 (22-55), 3 (57-66), 4 (70-82),
5 (85-90), 6 (93-107), 7 (110-123), 8 (125-140);
Texture : HOLOXTALLINE MEDIUM-GRAINED GNDMASS, EXCELLENT
SLICKENSIDE DEVELOPMENT AT THE BASE OF PCE 4 WITH
SOME PYRITE CRYSTALS(DARK GREEN TO BLACK);
Structure : MEGASCOPICALLY HOMOGENEOUS EXCEPT FOR A FEW PATCHES
OF SLIGHTLY MORE MAFIC REGIONS-MOSTLY NEAR THE BASE
OF PCE 7 AND THE TOP OF PCE 8;
Comments : COLOR IS N5 GRAY;
Phenocrysts: PYROXENE
MICROPHENOS;
Groundmass : PYROXENE
PLAGIOCLASE
Replacement: PYRITE
DARK GREEN TO BLACK IN COLOR;
Leg : 61 Top/Bottom Interval(mm): 0/ 720 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 958.72
Core: 76 Top of Core Depth (m) : 958.00
Sect: 1 Top of Section Depth(m): 958.00
LITHOLOGY: BASALT(DIABASE);
Piece No. : PCE 1 (5-10), 2 (11-20), 3 (22-35), 4 (35-54),
5 (56-70);
Texture : HOLOXTLLINE GNDMASS, PCES 1-4 HAVE DIABASIC TEXTURE,
PCE 5 APPEARS FINER GRAINED THAN OTHERS BUT EXHIBITS
NO TEXTURAL VARIATION;
Structure : MEGASCOPICALLY HOMOGENEOUS, PCE 5 CONTAINS GREEN
ALTERATION MINERAL+PYRITE+ZEOLITE ALONG FRACTURE
ZONE;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY, PCE 3 IS RUBBLE (BAGGED);
Phenocrysts: PYROXENE
Groundmass : PYROXENE
PLAGIOCLASE
Replacement: PYRITE
ZEOLITE
Alteration : MOD;
Comments : COLOR IS N5 GRAY, INTERVAL BETWEEN PCES 3E AND 4A
INTERPRETED AS CONTACT SEPARATING TWO COOLING UNITS-
NO GLASS FOUND HOWEVER;
Groundmass : PLAGIOCLASE
PYROXENE
Replacement: PYRITE
Size(mm): TO 7
ABUNDANT;
ZEOLITE
ID UNCERTAIN;
CALCITE
ID UNCERTAIN;
A GREEN MINERAL IS PRESENT IN VEINS THAT FILL
FRACTURES;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 968.50
Core: 77 Top of Core Depth (m) : 967.00
Sect: 1 Top of Section Depth(m): 967.00
LITHOLOGY: DIABASE;
APPEARS IDENTICAL TO BASALT DESCRIBED IN CORE 76
EXCEPT FOR VARIATION OF GRAIN SIZE;
Piece No. : PCE 1 (2-10), 2 (12-31), 3A (34-54), 3B (52-55),
3C (55-66), 3D (66-69), 3E (68-73), 4A (80-87),
4B (87-101), 4C (101-112), 4D (112-120),
4E (120-135), 4F (135-142), 4G (142-149);
Texture : HOLOCRYSTALLINE, NO GLASS FOUND, GRAIN SIZE
DECREASES DOWNWARD FROM TOP TO BOTTOM OF PCE 3E THEN
COARSENS FROM TOP OF PCE 4A TO END OF SECTION;
Structure : ROCK IS HIGHLY FRACTURED AND CONTAINS A GREEN
MINERAL AND ABUNDANT PYRITE (AS MUCH AS 7MM ACROSS)
AND ZEOLITE(?) AND CALCITE(?) IN VEINS THAT FILL
FRACTURES, OPTICAL EXAMINATION OF WHITE VEIN
MATERIAL IN PCE 4F REVEALS CALCITE-NO ZEOLITE NOTED;
Comments : INTERVAL BEYWEEN PCES 3E AND 4A INTERPRETED AS
CONTACT SEPARATING TWO COOLING UNITS, BASALT IS
N5 GRAY;
Groundmass : PLAGIOCLASE
PYROXENE
Replacement: PYRITE
Size(mm): TO 7
ZEOLITE
ID UNCERTAIN;
CALCITE
Leg : 61 Top/Bottom Interval(mm): 0/1420 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 969.92
Core: 77 Top of Core Depth (m) : 967.00
Sect: 2 Top of Section Depth(m): 968.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (2-7), 1B (7-13), 1C (14-20), 1D (20-27),
2A (30-32), 2B (31-39), 2C (40-48), 2D (48-59),
2E (59-69), 2F (70-89), 2G (89-101), 2H (102-111),
2I (111-119), 2J (119-132), 2K (131-140);
Texture : HOMOGENEOUS HOLOCRYSTALLINE ROCK COMPOSED OF
INTERLOCKING PLAG AND PYX FORMING A DIABASIC
TEXTURE;
Structure : NUMEROUS FRACTURES AND VEINS FILLED WITH PYRITE
AND ZEOLITE(?);
Alteration : MOD
LITTLE OR NO OBVIOUS ALTERATION OF ROCK AWAY FROM
VEINS;
Comments : BASALT IS N5-N6 GRAY;
Groundmass : PLAGIOCLASE
PYROXENE
Replacement: PYRITE
ZEOLITE
Leg : 61 Top/Bottom Interval(mm): 0/1340 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 971.34
Core: 77 Top of Core Depth (m) : 967.00
Sect: 3 Top of Section Depth(m): 970.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (1-30), 1B (30-40), 1C (40-55), 1D (55-65),
2A (70-72), 2B (71-85), 3A (86-90), 3B (89-96),
3C (96-102), 3D (102-107), 3E (107-115),
4 (118-130);
Texture : DIABASIC TEXTURE;
Structure : MEGASCOPICALLY HOMOGENEOUS, NUMEROUS FRACTURES SOME
OF WHICH CONTAIN VEINS CONSISTING OF PYRITE+
ZEOLITE(?)+A DARK GREEN ALTERATION;
Alteration : FRESH TO SLIGHTLY;
Comments : N5 GRAY;
Groundmass : PLAGIOCLASE
PYROXENE
Replacement: PYRITE
ZEOLITE
ID UNCERTAIN;
A DARK GREEN ALTERATION MINERAL ALSO IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/1360 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 977.36
Core: 78 Top of Core Depth (m) : 976.00
Sect: 1 Top of Section Depth(m): 976.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (2-5), 2A (6-10), 2B (10-18), 2C (19-21),
2D (20-34), 2E (34-41), 2F (41-49), 2G (48-55),
3A (56-70), 3B (71-80), 3C (80-90), 4 (91-105),
5 (107-115), 6 (118-125), 7 (128-132);
Texture : FINE-GRAINED DIABASE, SCATTERED AUGITE MICROPHENOS;
Structure : MEGASCOPICALLY HOMOGENEOUS, MANY FRACTURES LINED
WITH A GREENISH BLACK COATING AND CALCITE CRYSTALS,
Texture : SOME FRACTURES CONTAIN PYRITE;
Alteration : SLIGHTLY;
Comments : COLOR IS N6 GRAY;
Phenocrysts: AUGITE
SCATTERED MICROPHENOS;
Replacement: CALCITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1370 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 978.87
Core: 78 Top of Core Depth (m) : 976.00
Sect: 2 Top of Section Depth(m): 977.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (2-11), 1B (12-18), 1C (19-22), 2A (25-35),
2B (35-50), 3 (52-65), 4 (67-70), 5 (71-81),
6 (84-92), 7A (95-108), 7B (108-117), 8 (120-135);
Texture : PCES 1-4 ARE HOMOGENEOUSLY FINE-GRAINED, PCES 5-8
ARE SLIGHTLY COARSER-GRAINED, SCATTERED AUGITE
MICROPHENOS;
Structure : SEVERAL FRACTURES LINED WITH A GREENISH BLACK
COATING, SOME CALCITE AND PYRITE CRYSTALS ALONG THE
FRACTURES, HOMOGENEOUSLY FINE-GRAINED;
Alteration : SLIGHTLY;
Comments : COLOR IS N6 GRAY;
Phenocrysts: AUGITE
SCATTERED AUGITE MICROPHENOS;
Replacement: CALCITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 980.45
Core: 78 Top of Core Depth (m) : 976.00
Sect: 3 Top of Section Depth(m): 979.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (3-15), 2A (17-31), 2B (31-36), 3 (40-48),
4A (50-60), 4B (59-70), 4C (70-75), 5 (78-82),
6 (85-90), 7 (94-100), 8 (103-110), 9 (102-120),
10 (121-132), 11 (135-141);
Texture : PCES 1-4B ARE HOMOGENEOUSLY MEDIUM-GRAINED, THE
BOTTOM OF 4C BECOMES FINER GRAINED AND REMAINS
FINE-GRAINED THROUGH PCE 11, SCATTERED AUGITE
MICROPHENOS;
Structure : SEVERAL FRACTURES LINED WITH A GREENISH BLACK
COATING-OFTEN WITH SLICKENSIDES, SOME CALCITE
CRYSTALS ALONG FRACTURES;
Alteration : SLIGHTLY;
Comments : COLOR IS N6 GRAY, PCES 2+4 HEAT TREATED DURING
WRAPPING TO BE SAVED;
Phenocrysts: AUGITE
SCATTERED AUGITE MICROPHENOS;
Replacement: CALCITE
GREENISH BLACK COATING LINING FRACTURES;
Leg : 61 Top/Bottom Interval(mm): 0/1460 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 986.46
Core: 79 Top of Core Depth (m) : 985.00
Sect: 1 Top of Section Depth(m): 985.00
LITHOLOGY: COARSE BASALT OR MEDIUM-GRAINED DIABASE;
Piece No. : PCE 1A (3-9), 1B (5-25), 1C (24-32), 1D (32-48),
1E (49-54), 1F (53-60), 1G (63-72), 1H (76-82),
1I (82-91), 1J (91-102), 1K (102-113), 1L (113-125),
1M (122-133), 1N (134-145);
Texture : COARSE BASALT OR MEDIUM-GRAINED DIABASE, HOMOGENEOUS
IN GRAIN SIZE, SLIGHT GRAIN SIZE DECREASE POSSIBLE
IN PCES 1E+1F BUT PROBABLY NOT ENOUGH TO SEPARATE
INTO UNITS, SMALL MAFIC CLOTS APPEAR TO BE CPX
MICROPHENOS;
Structure : VEINED WITH CALCITE+DARK GREEN MINERAL+PYRITE IN
PCES 1A+1B+1F+1I+1J+1L, GREATLY FRACTURED AND
JOINTED THROUGHOUT, HOMOGENEOUS IN GRAIN SIZE;
Alteration : MOD;
Comments : PCES 1G+1H HEAT TREATED;
Phenocrysts: CLINOPYROXENE
SMALL MAFIC CLOTS APPEAR TO BE CPX MICROPHENOS;
Replacement: CALCITE
PYRITE
DARK GREEN MINERAL;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 988.00
Core: 79 Top of Core Depth (m) : 985.00
Sect: 2 Top of Section Depth(m): 986.50
LITHOLOGY: COARSE BASALT OR MEDIUM-GRAINED DIABASE;
Piece No. : PCE 1 (4-14), 2A (15-27), 2C (40-50), 2D (48-57),
2E (57-67), 2F (65-70), 2G (72-80), 2H (79-87),
2I (87-100), 2J (96-105), 2K (104-110),
3 (112-120), 4A (120-130), 4B (130-150);
Texture : COARSE BASALT OR MEDIUM-GRAINED DIABASE, HOMOGENEOUS
IN GRAIN SIZE, DARK MAFIC MINERALS APPEAR TO BE
MICROPHENOS;
Structure : RARE VEINS OF DARK GREEN MINERAL+CALCITE+PYRITE IN
PCES 2B+2D+2H+3;
Alteration : SLIGHTLY;
Comments : HOMOGENEOUS IN COMPOSITION;
Phenocrysts: DARK MAFIC MINERALS APPEAR TO BE MICROPHENOS;
Replacement: CALCITE
PYRITE
DARK GREEN MINERAL IN VEIN;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 989.50
Core: 79 Top of Core Depth (m) : 985.00
Sect: 3 Top of Section Depth(m): 988.00
LITHOLOGY: COARSE BASALT OR MEDIUM-GRAINED DIABASE;
Piece No. : PCE 1 (3-18), 2 (20-25), 3A (6-35), 3B (34-42),
3C (40-50), 3D (50-69), 3E (69-85), 3F (85-87),
3G (87-100), 3H (100-110), 3I (110-120),
3J (119-130), 3K (129-135), 3L (135-140),
3M (140-150);
Texture : HOMOGENEOUS IN TEXTURE, PCE 1 MAY HAVE SLIGHTLY
SMALLER OR FINER GRAIN SIZES THAN REMAINDER BUT
DIFFERENCE IS NOT GREAT;
Structure : FRACTURED SURFACES ARE COATED WITH DARK GREENISH
BLACK MINERAL AND SOME VEINS HAVE CALCITE+PYRITE
ALONG WITH THE DARK GREENISH BLACK (CHLORITE?)
MINERAL, PYRITE VEIN PARTICULARLY PROMINENT IN PCES
3H AND 3I;
Alteration : SLIGHTLY;
Comments : RELATIVELY HOMOGENEOUS IN COMPOSITION;
Replacement: DARK GREENISH BLACK MINERAL COATING FRACTURE
SURFACES, POSSIBLY CHLORITE;
PYRITE
CALCITE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 990.95
Core: 79 Top of Core Depth (m) : 985.00
Sect: 4 Top of Section Depth(m): 989.50
LITHOLOGY: COARSE BASALT OR MEDIUM-GRAINED DIABASE;
Piece No. : PCE 1A (4-14), 1B (14-26), 1C (26-35), 1D (35-40),
1E (38-45), 1F (46-56), 1G (55-70), 1H (70-82),
1I (75-92), 1J (92-107), 1K (106-117), 1L (17-128),
1M (127-140);
Texture : COARSE GRAINED BASALT OR MEDIUM-GRAINED DIABASE,
HOMOGENEOUS GRAIN SIZE;
Structure : MOST JOINTS COVERED WITH THIN COATING OF DARK
GREENISH BLACK MINERAL (CHLORITE?) AND CALCITE AND
SOME PYRITE;
Alteration : SLIGHTLY;
Comments : ROCK RELATIVELY HOMOGENEOUS MEGASCOPICALLY BOTH IN
GRAIN SIZE AND COMPOSITION, PCES 1B+1G+1H+1I WERE
HEAT TREATED;
Replacement: DARK GREENISH BLACK MINERAL COATING FRACTURE
SURFACES, POSSIBLY CHLORITE;
PYRITE
CALCITE
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 992.48
Core: 79 Top of Core Depth (m) : 985.00
Sect: 5 Top of Section Depth(m): 991.00
LITHOLOGY: COARSE BASALT OR MEDIUM-GRAINED DIABASE;
Piece No. : PCE 1A (2-22), 1B (22-36), 1C (36-52), 1D (52-57),
1E (55-86), 1F (85-97), 1G (95-101), 1H (100-115),
1I (115-130), 1J (130-142);
Texture : COARSE-GRAINED BASALT OR MEDIUM-GRAINED DIABASE,
DECREASE IN GRAIN SIZE FROM TOP TO BOTTOM INDICATING
PROBABLE BASE OF UNIT;
Structure : RARE VEINS OF CHLORITE(?)+CALCITE+PYRITE;
Alteration : SLIGHTLY;
Comments : OVERLIES GRAYISH RED VOLCANIC CLAYSTONE-RED COLOR
MAY BE CAUSED BY BAKING, COMPOSITION SEEMS
RELATIVELY HOMOGENEOUS;
Leg : 61 Top/Bottom Interval(mm): 0/ 160 Analyst:
Hole: 462A Sample Midpoint (m) : 992.66
Core: 79 Top of Core Depth (m) : 985.00
Sect: 6 Top of Section Depth(m): 992.50
LITHOLOGY: SILTSTONE;
Comments : ALMOST ENTIRELY ALTERED TO CLAY (SMEC?)
AND IS PROBABLY A DEVITRIFIED HYALOCLASTITE;
Leg : 61 Top/Bottom Interval(mm): 0/1100 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 996.60
Core: 80 Top of Core Depth (m) : 994.00
Sect: 2 Top of Section Depth(m): 995.50
LITHOLOGY: SEDIMENTS;
Leg : 61 Top/Bottom Interval(mm): 1100/1500 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 997.00
Core: 80 Top of Core Depth (m) : 994.00
Sect: 2 Top of Section Depth(m): 996.60
LITHOLOGY: DIABASE;
Piece No. : PCE 2 (113-117), 3 (120-132), 4 (135-150);
Texture : TOP OF PCE 2 IS FINE-GRAINED, INTERVAL (120-149) IS
MEDIUM-GRAINED WITH SCATTERED AUGITE MICROPHENOS;
Structure : SEVERAL FRACTURES ARE PRESENT AND ARE COATED WITH
USUAL GREENISH BLACK MATERIAL;
Comments : COLOR IS N6 GRAY;
Phenocrysts: AUGITE
SCATTERED AUGITE MICROPHENOS;
Replacement: GREENISH BLACK MATERIAL;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 998.50
Core: 80 Top of Core Depth (m) : 994.00
Sect: 3 Top of Section Depth(m): 997.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (2-20), 2A (24-31), 2B (31-46), 2C (46-60),
2D (59-74), 2E (70-81), 3 (84-97), 4 (99-104),
5A (105-110), 5B (110-119), 6A (120-127),
6B (127-135), 7 (135-148);
Texture : FINE-GRAINED;
Structure : SEVERAL FRACTURES, OFTEN HAVE CENTRAL PORTION FILLED
WITH A DARK GREENISH BLACK MATERIAL THAT IS
SURROUNDED BY A LIGHTER GREEN MATERIAL, WHITE
CALCITE OCCASIONALLY OCCURS IN THE DARKER CENTRAL
PART OF FRACTURES, MEGASCOPICALLY HOMOGENEOUS;
Alteration : MOD;
Comments : PCE 2E HAS BEEN HEAT TREATED;
COLOR IS N6 GRAY;
Replacement: DARK GREENISH BLACK MATERIAL SURROUNDED BY A
LIGHTER GREEN MATERIAL IN VEINS;
CALCITE
OCCASIONALLY OCCURS;
Leg : 61 Top/Bottom Interval(mm): 0/ 400 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 998.90
Core: 80 Top of Core Depth (m) : 994.00
Sect: 4 Top of Section Depth(m): 998.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (2-15), 2 (17-25), 3 (27-37);
Texture : FINE-GRAINED, SCATTERED AUGITE MICROPHENOS;
Structure : RELATIVELY UNFRACTURED, FRACTURE SURFACES COATED
WITH A GREENISH BLACK COATING AND FIBROUS MATERIAL,
SOME POCKETS OF GLASSY MATERIAL ON THE FRACTURES AT
THE TOP OF PCE 2, MEGASCOPICALLY HOMOGENEOUS;
Alteration : MOD;
Comments : COLOR IS N6 GRAY, PCE 2 HAS BEEN HEAT TREATED;
Phenocrysts: AUGITE
SCATTERED MICROPHENOS;
Replacement: FRACTURE SURFACES COATED WITH A GREENISH BLACK
COATING AND FIBEROUS MINERAL;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 999.50
Core: 81 Top of Core Depth (m) : 998.00
Sect: 1 Top of Section Depth(m): 998.00
LITHOLOGY: BASALT;
Piece No. : PCE 1 (2-8), 2 (10-15), 3A (17-27), 3B (27-35),
4A (40-55), 4B (55-70), 5A (70-80), 5B (80-90),
5C (85-100), 5D (100-107), 5E (107-110),
6A (112-120), 6B (121-123), 6C (122-126),
6D (126-136), 6E (135-141), 6F (142-145);
Texture : SUBOPHITIC TO DIABASIC TEXTURE, NO TEXTURAL CHANGES
OBSERVED OVER LENGTH OF SECTION;
Structure : MEGASCOPICALLY HOMOGENEOUS, SOMEWHAT FRACTURED, SOME
FRACTURES FILLED WITH VEINS OF PYRITE+CALCITE+A DARK
GREEN MATERIAL (CHLORITE?, SMECTITE?);
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY;
Groundmass : PLAGIOCLASE
PYROXENE
INTERLOCKING PLAG AND PYX FORMING A SUBOPHITIC
TO DIABASIC TEXTURE;
Replacement: PYRITE
CALCITE
A DARK GREEN MATERIAL POSSIBLY CHLORITE OR
SMEC;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1001.00
Core: 81 Top of Core Depth (m) : 998.00
Sect: 2 Top of Section Depth(m): 999.50
LITHOLOGY: BASALT;
Piece No. : PCE 1A (4-20), 1B (20-27), 2 (30-34), 3A (36-47),
3B (45-59), 3C (60-69), 3D (70-85), 4A (100-115),
4B (115-133), 4C (134-150);
Texture : SUBOPHITIC TO DIABASIC TEXTURE, NO TEXTURAL
VARIATION WITHIN LENGTH OF SECTION;
Structure : MEGASCOPICALLY HOMOGENEOUS, SOME FRACTURING IN ROCK
AND SOME OF THESE FRACTURES FILLED WITH PYRITE+
CALCITE+A DARK GREEN MATERIAL (CHLORITE?, SMEC?);
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY, PCE 4C HEATED IN SHRINK-TUBING FOR
CUTTING;
Groundmass : PLAGIOCLASE
PYROXENE
Replacement: CALCITE
PYRITE
A DARK GREEN MATERIAL POSSIBLY CHLORITE OR
SMEC;
Leg : 61 Top/Bottom Interval(mm): 0/ 870 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1001.87
Core: 81 Top of Core Depth (m) : 998.00
Sect: 3 Top of Section Depth(m): 1001.00
LITHOLOGY: BASALT;
Piece No. : PCE 1A (3-10), 1B (10-15), 1C (16-30), 1D (30-47),
2A (50-67), 2B (68-83);
Texture : SUBOPHITIC TO OPHITIC TEXTURE;
Structure : HOMOGENEOUS THROUGHOUT, PYRITE AND DARK MATERIAL
FILL SOME OF THE FRACTURES IN THE ROCK;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY;
Groundmass : PLAGIOCLASE
PYROXENE
PLAG AND PYX FORM SUBOPHITIC TO OPHITIC TEXTURE;
Replacement: PYRITE
A DARK MATERIAL IN FRACTURES;
Leg : 61 Top/Bottom Interval(mm): 0/ 510 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1003.51
Core: 82 Top of Core Depth (m) : 1003.00
Sect: 1 Top of Section Depth(m): 1003.00
LITHOLOGY: BASALT;
Piece No. : PCE 1A (5-8), 1B (10-14), 1C (20-25), 2A (27-28),
2B (27-31), 3 (24-38), 4A (40-48);
Texture : TEXTURALLY HOMOGENEOUS DIABASIC BASALT, APPARENT
PSEUDOMORPHS AFTER OL PHENOS SET IN A SUBOPHITIC TO
OPHITIC GNDMASS;
Structure : PYRITE AND A DARK GREEN MATERIAL LINE FRACTURE THAT
SEPARATES PCES 4A+4B+4C;
Alteration : FRESH TO SLIGHTLY;
Comments : CUTTINGS FROM HOLE CONTAINED IN INTERVAL (3-19)
SURROUNDS BASALT PCES 1A AND 1B, COLOR IS N5 GRAY,
PCE 4 IS ONLY ORIENTABLE SAMPLE RECOVERED;
Phenocrysts: OLIVINE
ALTERED;
Groundmass : PLAGIOCLASE
PYROXENE
SUBOPHITIC TO OPHITIC TEXTURE;
Replacement: PYRITE
DARK GREEN MATERIAL LINES FRACTURES;
Leg : 61 Top/Bottom Interval(mm): 0/ 130 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 1004.13
Core: 83 Top of Core Depth (m) : 1004.00
Sect: 1 Top of Section Depth(m): 1004.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (2-11);
Texture : FINE-GRAINED HOMOGENEOUS DIABASE, NO PHENOS;
Structure : HOMOGENEOUS, NOT FRACTURED;
Alteration : MOD;
Comments : COLOR N5 GRAY;
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 1006.95
Core: 84 Top of Core Depth (m) : 1005.50
Sect: 1 Top of Section Depth(m): 1005.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (2-6), 2 (8-31), 3 (34-53), 4A (55-66),
4B (66-80), 5 (82-95), 6A (98-115), 6B (115-142);
Texture : FINE-GRAINED HOMOGENEOUS DIABASE, NO PHENOS;
Structure : HOMOGENEOUS, SOME SUBHORIZONTAL FRACTURES WITH
GREENISH-BLACK COATINGS;
Alteration : SLIGHTLY;
Comments : COLOR IS N5 GRAY;
Leg : 61 Top/Bottom Interval(mm): 0/1180 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 1008.18
Core: 84 Top of Core Depth (m) : 1005.50
Sect: 2 Top of Section Depth(m): 1007.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (2-27), 1B (27-60), 1C (60-72), 2A (75-92),
2B (92-115);
Texture : MEDIUM-GRAINED DIABASE, NO PHENOS;
Structure : MEGASCOPICALLY HOMOGENEOUS, SOME SUB-HORIZONTAL
FRACTURES WITH A GREENISH-BLACK SURFACE COATING;
Alteration : SLIGHTLY;
Comments : COLOR IS N5 GRAY;
Leg : 61 Top/Bottom Interval(mm): 0/1440 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 1009.94
Core: 84 Top of Core Depth (m) : 1005.50
Sect: 3 Top of Section Depth(m): 1008.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (2-65), 1B (65-95), 1C (95-100),
1D (101-125), 1E (125-132), 1F (134-142);
Texture : MOSTLY FINE-GRAINED DIABASE, POSSIBLY SOME BIOTITE
SLICKENSIDES OCCURS OCCASIONALLY, SCATTERED
COARSER GRAINED MAFIC MINERAL CONCENTRATIONS ARE
MEDIUM-GRAINED;
Structure : FRACTURE SURFACES COATED WITH A GREENISH-BLACK
COATING AND SOME CALCITE;
Alteration : MOD;
Comments : COLOR IS N5 GRAY;
Groundmass : SCATTERED COARSER MAFIC MINERAL CONCENTRATIONS;
Replacement: CALCITE
COATING FRACTURE SURFACES;
BIOTITE
POSSIBLE BIOTITE SLICKENSIDES;
Leg : 61 Top/Bottom Interval(mm): 0/1270 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 1011.27
Core: 84 Top of Core Depth (m) : 1005.50
Sect: 4 Top of Section Depth(m): 1010.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (4-20), 1B (20-42), 1C (42-46), 1D (45-63),
2 (65-102), 3A (105-125), 3B (112-125);
Texture : MOSTLY FINE-GRAINED DIABASE, SCATTERED COARSER
GRAINED MAFIC MINERAL CONCENTRATIONS ARE MEDIUM-
GRAINED;
Structure : FRACTURE SURFACES COATED WITH A GREENISH-BLACK
MATERIAL THAN CONTAINS SCATTERED PYRITE;
Alteration : MOD;
Comments : COLOR IS N5 GRAY;
Replacement: PYRITE
FRACTURE SURFACES COATED WITH A GREENISH-BLACK
MATERIAL;
Leg : 61 Top/Bottom Interval(mm): 0/1410 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1012.91
Core: 84 Top of Core Depth (m) : 1005.50
Sect: 5 Top of Section Depth(m): 1011.50
LITHOLOGY: DIABASE;
Piece No. : PCES 1A (4-16), 1B (16-20), 1C (10-35), 1D (35-67),
1E (66-69), 2A (71-90), 3 (93-110), 4A (111-116),
4B (116-125), 5 (127-140);
Texture : SUBOPHITIC TEXTURE;
Structure : FRACTURES ARE COMMONLY COATED WITH THIN LAYER OF
DARK-GREEN CLAY LIKE MATERIAL, PCES 1A-1D CONTAIN
SUB-HORIZONTAL LAYERS OF MAFIC MINERAL
CONCENTRATIONS, REMAINDER OF SECTION APPEARS
MEGASCOPICALLY HOMOGENEOUS;
Alteration : FRESH TO SLIGHTLY;
Comments : N5 GRAY COLOR;
Groundmass : PLAGIOCLASE
PYROXENE
Leg : 61 Top/Bottom Interval(mm): 0/1370 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1014.37
Core: 84 Top of Core Depth (m) : 1005.50
Sect: 6 Top of Section Depth(m): 1013.00
LITHOLOGY: BASALT(DIABASE);
Piece No. : PCE 1A (5-10), 1B (10-35), 1C (35-43), 1D (43-58),
2 (60-67), 3A (69-86), 3B (86-100), 4 (102-107),
5A (110-126), 5B (127-135);
Texture : SUBOPHITIC TEXTURE, GRAIN SIZE APPEARS TO BE FAIRLY
UNIFORM THROUGHOUT SECTION;
Structure : SLIGHTLY FRACTURED AND LINED WITH DARK CLAY-LIKE
MATERIAL;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR=N5 GRAY;
Groundmass : LOCAL CONCENTRATIONS OF MAFIC MINERALS OCCUR
RANDOMLY THROUGHOUT;
Replacement: DARK GREEN CLAY-LIKE MATERIAL LINES FRACTURES;
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1015.90
Core: 85 Top of Core Depth (m) : 1014.50
Sect: 1 Top of Section Depth(m): 1014.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (2-12), 1B (12-21), 1C (21-35), 1D (35-59),
2A (60-70), 2B (70-90), 3 (92-95), 4A (96-110),
4B (110-123), 4C (121-130), 4D (130-139);
Texture : SUBOPHITIC TEXTURE, GRAIN SIZE APPEARS TO BE FAIRLY
UNIFORM THROUGHOUT SECTION;
Structure : SLIGHTLY FRACTURED AND LINED WITH DARK CLAY-LIKE
MATERIAL AND FILLED WITH PYRITE;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR=N5 GRAY, PCES 1C+1D PUT IN HEAT-SHRINK
PLASTICS FOR CUTTING;
Leg : 61 Top/Bottom Interval(mm): 0/1430 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1017.43
Core: 85 Top of Core Depth (m) : 1014.50
Sect: 2 Top of Section Depth(m): 1016.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (2-62), 1B (60-81), 1C (81-101),
1D (101-107), 1E (106-120), 1F (119-126),
2 (128-131), 3 (133-141);
Texture : SUBOPHITIC TEXTURE, GRAIN SIZE GENERALLY UNIFORM
THROUGHOUT SECTION;
Structure : SOMEWHAT FRACTURED, A LIGHT GREEN CLAY-LIKE MATERIAL
FILLS SOME OF THE FRACTURES;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR=N5 GRAY;
Groundmass : PYROXENE
PLAGIOCLASE
Replacement: A LIGHT GREEN CLAY-LIKE MATERIAL FILLS SOME OF
THE FRACTURES;
Leg : 61 Top/Bottom Interval(mm): 0/1470 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1018.97
Core: 85 Top of Core Depth (m) : 1014.50
Sect: 3 Top of Section Depth(m): 1017.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (3-6), 1B (5-16), 2 (18-27), 3A (30-45),
3B (45-61), 3C (60-70), 3D (70-86), 3E (86-87),
3F (86-105), 4A (106-112), 4B (112-119),
5A (120-130), 5B (127-136), 5C (136-145);
Texture : SUBOPHITIC TEXTURE, GRAIN SIZE IS GENERALLY UNIFORM
THROUGHOUT;
Structure : DARK-GREEN CLAY-LIKE MATERIAL FILLS SOME OF THE
FRACTURES;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY, PCES 3C(BAGGED RUBBLE)+5C+LOWER
END OF PCE 3B WERE PUT IN HEAT-SHRINK TUBING FOR
CUTTING;
Groundmass : PYROXENE
PLAGIOCLASE
Leg : 61 Top/Bottom Interval(mm): 0/1450 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1020.45
Core: 85 Top of Core Depth (m) : 1014.50
Sect: 4 Top of Section Depth(m): 1019.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (4-15), 1B (15-22), 1C (23-27), 1D (28-47),
2A (50-67), 2B (67-79), 2C (79-86), 2D (86-98),
3 (100-116), 4 (118-126), 5 (128-135), 6 (136-144);
Texture : SUBOPHITIC, GRAIN SIZE IS UNIFORM THROUGHOUT;
Structure : LIGHT GREEN MATERIAL FILLS VEINS IN PCES 1A-1D AND
2A+2B;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY;
Leg : 61 Top/Bottom Interval(mm): 0/ 310 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1020.81
Core: 85 Top of Core Depth (m) : 1014.50
Sect: 5 Top of Section Depth(m): 1020.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (4-10), 2A (12-20), 2B (20-30);
Texture : SUBOPHITIC, UNIFORM TEXTURE THROUGHOUT;
Alteration : FRESH TO SLIGHTLY;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 1027.48
Core: 87 Top of Core Depth (m) : 1026.00
Sect: 1 Top of Section Depth(m): 1026.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (3-8), 2 (11-15), 3 (17-20), 4A (22-35),
4B (36-45), 5A (47-50), 5B (50-57), 6A (70-72),
6B (71-81), 6C (81-90), 6D (91-100), 6E (101-113),
7 (115-145);
Texture : FINE-GRAINED DIABASE;
Structure : FRACTURES LINED WITH A GREENISH-BLACK COATING
AND SOMETIMES IN SLICKENSIDES;
Alteration : MOD;
Comments : COLOR IS N6 GRAY, MEGASCOPICALLY SIMILAR ROCK ALONG
ENTIRE SECTION;
Groundmass : MANY SMALL SCATTERED MAFIC MINERAL CONCENTRATIONS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 1029.00
Core: 87 Top of Core Depth (m) : 1026.00
Sect: 2 Top of Section Depth(m): 1027.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (4-15), 1B (15-25), 1C (26-27), 2A (30-39),
2B (40-48), 3A (50-56), 3B (50-56), 3C (57-60),
4A (61-70), 4B (70-78), 4C (79-91), 4D (92-100),
4E (100-117), 4F (111-128), 4G (128-140),
4H (139-146);
Texture : FINE-GRAINED MOSTLY HOMOGENEOUS;
Structure : FRACTURES ARE COVERED WITH THE USUAL GREENISH-BLACK
Texture : COATING, SOME PYRITE CRYSTALS ARE PRESENT ALONG
THE FRACTURES, MEGASCOPICALLY HOMOGENEOUS;
Alteration : MOD;
Comments : COLOR IS N5 GRAY;
Replacement: PYRITE
Groundmass : SCATTERED POORLY DEFINED MAFIC MINERAL
CONCENTRATIONS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1034.00
Core: 88 Top of Core Depth (m) : 1032.50
Sect: 1 Top of Section Depth(m): 1032.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (4-7), 2A (10-21), 2B (22-26), 3A (28-30),
3B (32-33), 4A (35-50), 4B (49-57), 4C (52-70),
4D (69-77), 5A (80-95), 5B (95-116), 5C (116-128),
5D (129-135), 5C (135-148);
Texture : SUBOPHITIC TEXTURE, GRAIN SIZE IS MEGASCOPICALLY
UNIFORM;
Structure : NUMEROUS SUB-HORIZONTAL FRACTURES, MOST ARE FILLED
WITH A DARK-GREEN CLAY-LIKE MATERIAL;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY;
Leg : 61 Top/Bottom Interval(mm): 0/1400 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1035.40
Core: 88 Top of Core Depth (m) : 1032.50
Sect: 2 Top of Section Depth(m): 1034.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (3-10), 1B (10-14), 1C (5-35), 1D (35-54),
1E (54-105), 1F (105-130), 1G (130-138);
Texture : MOST OF SECTION EXHIBITS A SUBOPHITIC TEXTURE BUT
SOME AREAS ARE COARSER GRAINED;
Structure : DARK-GREEN CLAY-LIKE MATERIAL FILLS MOST OF THE
FRACTURES;
Alteration : FRESH TO SLIGHTLY;
Comments : MAY BE MICROPEGMATITES BUT CONTACTS ARE ALL
GRADATIONAL AND MAY SIMPLY REPRESENT LOCAL
INHOMOGENEITIES IN ORIGINAL MAGMA;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1037.00
Core: 88 Top of Core Depth (m) : 1032.50
Sect: 3 Top of Section Depth(m): 1035.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (3-30), 1B (30-41), 2 (42-45), 3 (47-56),
4 (59-70), 5A (71-81), 5B (82-80), 5C (90-100),
6 (101-103), 7A (105-118), 7B (120-131),
7C (131-136), 7D (136-142), 7E (143-148);
Texture : SUBOPHITIC, SOME AREAS ARE COARSER GRAINED THAN BULK
OF ROCK;
Structure : FEW FRACTURES ARE PRESENT THAT ARE FILLED BY A DARK-
GREEN CLAY-LIKE MATERIAL;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY, CONTACTS ARE GRADATIONAL AND MAY
REPRESENT INHOMOGENEITIES IN ORIGINAL MAGMA OR
POSSIBLY MICROPEGMATITES;
Leg : 61 Top/Bottom Interval(mm): 0/ 220 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1037.22
Core: 88 Top of Core Depth (m) : 1032.50
Sect: 4 Top of Section Depth(m): 1037.00
LITHOLOGY: DIABASE;
Piece No. : PCE 1A (4-12), 1B (13-20);
Texture : UNIFORM SUBOPHITIC TEXTURE;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N5 GRAY;
Leg : 61 Top/Bottom Interval(mm): 0/1470 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1037.97
Core: 89 Top of Core Depth (m) : 1036.50
Sect: 1 Top of Section Depth(m): 1036.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (3-10), 2 (12-17), 3 (20-30), 4 (34-45),
5A (46-57), 5B (57-74), 6A (76-81), 6B (81-93),
7 (104-115), 8 (119-126), 9 (129-145);
Texture : UNIFORM SUBOPHITIC TEXTURE THROUGHOUT SECTION;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR=N5 GRAY;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1039.50
Core: 89 Top of Core Depth (m) : 1036.50
Sect: 2 Top of Section Depth(m): 1038.00
LITHOLOGY: BASALT;
Piece No. : PCE 1 (4-20), 2A (23-27), 2B (28-42), 2C (42-50),
2D (50-56), 3 (48-61), 4 (63-66), 5 (69-75),
6A (77-86), 6B (87-95), 6C (95-101), 6D (102-113),
7 (115-125), 8A (128-140), 8B (140-146),
8C (147-150);
Texture : SUBOPHITIC IN UPPER PART OF PCE 1 TO APHANITIC IN
LOWER PART OF PCE 1 AND REMAINS FINE-GRAINED
THROUGHOUT REST OF SECTION;
Structure : FRACTURING OF THE ROCK IS GREATER DOWN SECTION, THE
FRACTURES ARE FILLED WITH PYRITE+ZEOLITE(?)+DARK
GREEN CLAY-LIKE MATERIAL, PCE 3 APPEARS TO
REPRESENT PART OF A LARGE VEIN THAT CONTAINS CALCITE
AND A TRANSPARENT WHITE MINERAL TENTATIVELY
IDENTIFIED AS THOMPSONITE(PARALLEL EXTINCTION, LOW
BIREFRINGENCE,GOOD CLEAVAGE, RI APPROX. 1.51-1.53);
Alteration : FRESH TO MOD
LOCAL PATCHES OF ZEOLITE(?) AND A DARK GREEN
ALTERATION MINERAL OCCUR LOCALLY-ESPECIALLY IN
PCE 2B;
Comments : PCES 2D+6A-6D+7+8A-8C PLACED IN HEAD-SHRINK TUBING
FOR CUTTING;
Replacement: SMALL DARK GRAINS ARE PRESENT IN ROCK THAT
APPEAR TO BE OL PSEUDOMORPHS;
PYRITE
CALCITE
ZEOLITE
ID UNCERTAIN;
A TRANSPARENT WHITE MINERAL TENTATIVELY IDENTIFIED
AS THOMPSONITE;
Leg : 61 Top/Bottom Interval(mm): 0/1380 Analyst: Windom, K
Hole: 462A Sample Midpoint (m) : 1040.88
Core: 89 Top of Core Depth (m) : 1036.50
Sect: 3 Top of Section Depth(m): 1039.50
LITHOLOGY: BASALT;
Piece No. : PCE 1A (2-11), 1B (13-22), 1C (24-30), 2 (32-35),
3A (36-39), 3B (40-42), 4 (45-47), 5A (50-55),
5B (55-62), 5C (62-72), 6 (74-77), 7 (80-85),
8 (86-90), 9A (93-100), 9B (100-107),
10A (117-127), 10B (129-136);
Texture : TOP OF SECTION IS FINE-GRAINED GRADING TO COARSER
GRAINED AT BOTTOM WHERE TEXTURE BECOMES SUBOPHITIC;
Structure : DEGREE OF FRACTURING SEEMS TO BE ASSOCIATED WITH
GRAIN SIZE WITH THE FINE-GRAINED PORTIONS BEING THE
MOST HIGHLY FRACTURED, MANY OF THE FRACTURES ARE
FILLED WITH PYRITE+AN UNKNOWN WHITE MINERAL+A DARK
GREEN MINERAL, A VERY DENSE-LOOKING (FINE-GRAINED)
LIGHT GREEN MATERIAL IS PRESENT IN PCES 5A-5C;
Alteration : FRESH TO SLIGHTLY;
Comments : COLOR IS N6 GRAY FOR THE FINE-GRAINED PORTIONS AND
N5 GRAY FOR THE COARSE-GRAINED PORTIONS, PCES 5A-5C+
9A-9C WERE PUT IN HEAT-SHRINK PLASTIC FOR CUTTING;
Replacement: PYRITE
AN UNKNOWN WHITE MINERAL AND A DARK GREEN
MINERAL;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 1043.00
Core: 90 Top of Core Depth (m) : 1041.50
Sect: 1 Top of Section Depth(m): 1041.50
LITHOLOGY: BASALT;
Piece No. : PCE 1 (4-12), 2A (12-27), 2B (27-34), 3A (35-45),
3B (45-54), 3C (55-62), 4 (65-71), 5A (74-92),
5B (92-110), 5C (110-117), 6 (120-122),
7A (123-130), 7B (130-145), 7C (143-150);
Texture : FINE TO MEDIUM-GRAINED FROM TOP TO BOTTOM;
Structure : GREATLY FRACTURED, SOME GREEN AND WHITE VEINS-
CHLORITE+ZEOLITE, GREENISH BLACK VEINS AND JOINT
COATINGS, SOME N8 VERY LIGHT GRAY VEINS, PYRITE
VEIN AT 143CM;
Alteration : MOD;
Comments : TOP OF COOLING UNIT NEAR TOP OF SECTION BECOMING
COARSER GRAINED TOWARDS BASE;
N5 MEDIUM GRAY, GREENISH BLACK VEINS ARE 5GY2/1;
Replacement: CHLORITE
ZEOLITE
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 1044.50
Core: 90 Top of Core Depth (m) : 1041.50
Sect: 2 Top of Section Depth(m): 1043.00
LITHOLOGY: MEDIUM-GRAINED BASALT;
Piece No. : PCE 1A (2-11), 1B (11-20), 1C (20-35), 1D (35-40),
1E (37-49), 1F (49-55), 2A (56-65), 2B (65-72),
2C (72-800, 2D (82-87), 2E (88-95), 2F (95-100),
2G (100-110), 2H (110-120), 3A (122-135),
3B (135-146);
Texture : MEDIUM-GRAINED;
Structure : 5GY2/1 GREENISH BLACK VEINS AND JOINT COATINGS, SOME
COATINGS, SOME N8 VERY LIGHT GRAY VEINS, GREATLY
FRACTURED;
Alteration : MOD
ALTERED AROUND JOINTS AND VEINS;
Comments : BASALT IS N5 MEDIUM GRAY;
Replacement: GREENISH BLACK CRYSTALS MAY BE REPLACED OL
OR AUGITE PHENOS;
Leg : 61 Top/Bottom Interval(mm): 0/1500 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 1046.00
Core: 90 Top of Core Depth (m) : 1041.50
Sect: 3 Top of Section Depth(m): 1044.50
LITHOLOGY: MEDIUM-GRAINED BASALT;
Piece No. : PCE 1A (2-15) 1B (14-27), 1C (27-36), 1D (35-45),
1E (45-55), 1F (56-65), 1G (65-75), 1H (74-90),
1I (90-95), 2A (97-119), 2B (117-130), 3 (130-142),
4 (144-147);
Texture : MEDIUM-GRAINED;
Structure : FAIRLY HOMOGENEOUS THROUGHOUT SECTION, SOME VEINS
FILLED WITH ZEOLITE+CHLORITE(?)+RARE PYRITE, MAJOR
VEINS IN PCES 1B+1E+2A;
Alteration : MOD
ALTERED PARTICULARLY ALONG JOINTS;
Comments : BASALT IS N6 MEDIUM GRAY, DARK SEGREGATION(?) IN PCE
1G;
Replacement: ZEOLITE
CHLORITE
ID UNCERTAIN;
PYRITE
RARE;
Leg : 61 Top/Bottom Interval(mm): 0/1440 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 1047.44
Core: 90 Top of Core Depth (m) : 1041.50
Sect: 4 Top of Section Depth(m): 1046.00
LITHOLOGY: MEDIUM-GRAINED BASALT;
Piece No. : PCE 1 (2-10), 2 (11-15), 3 (15-22), 4A (23-35),
4B (35-51), 4C (51-70), 4D (70-83), 4E (82-105),
5 (107-110), 6 (111-137);
Texture : MEDIUM-GRAINED, FAIRLY HOMOGENEOUS IN GRAIN SIZE
THROUGHOUT SECTION;
Structure : FRACTURED WITH VEINS FILLED WITH ZEOLITES+
CHLORITE(?)+PYRITE, PYRITE VEIN IN PCE 4A-4C,
ZEOLITE VEINS IN PCE 5;
Alteration : MOD
Comments : BASALT COLOR IS N6 GRAY;
Replacement: ZEOLITE
CHLORITE
ID UNCERTAIN;
PYRITE
Leg : 61 Top/Bottom Interval(mm): 0/ 930 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 1048.43
Core: 90 Top of Core Depth (m) : 1041.50
Sect: 5 Top of Section Depth(m): 1047.50
LITHOLOGY: MEDIUM-GRAINED BASALT;
Piece No. : PCE 1A (3-22), 1B (21-30), 1C (30-36), 2 (37-45),
3 (45-52), 4 (53-65), 5 (66-71), 6 (72-75),
7 (77-80), 8 (82-85), 9 (88-91);
Texture : MEDIUM-GRAINED THROUGHOUT;
Structure : FRACTURED-HORIZONTAL JOINTS IN PCES 3+4, VEINS ARE
PRESENT IN PCE 1;
Alteration : MOD;
Comments : ENTIRE CORE 90 SEEMS TO BE IN SAME FLOW OR
INTRUSIVE UNIT, BASALT COLOR IS N6 MEDIUM GRAY;
Leg : 61 Top/Bottom Interval(mm): 0/ 100 Analyst: Vallier, T.
Hole: 462A Sample Midpoint (m) : 1050.60
Core: 91 Top of Core Depth (m) : 1050.50
Sect: 1 Top of Section Depth(m): 1050.50
LITHOLOGY: MEDIUM-GRAINED BASALT;
Piece No. : PCE 1 (3-7);
Texture : MEDIUM-GRAINED;
Structure : FRACTURED;
Alteration : MOD;
Comments : BASALT COLOR IS N6, ONLY RECOVERY FROM CORE 91;
Leg : 61 Top/Bottom Interval(mm): 0/ 100 Analyst: Seifert, K.
Hole: 462A Sample Midpoint (m) : 1059.60
Core: 92 Top of Core Depth (m) : 1059.50
Sect: 1 Top of Section Depth(m): 1059.50
LITHOLOGY: DIABASE;
Piece No. : PCE 1 (3-8);
Texture : MEDIUM-GRAINED;
Structure : FEW SUBPARALLEL FRACTURES;
Alteration : MOD;
Comments : DIABASE COLOR IS N5 GRAY, ONLY ONE PCE RECOVERED
FROM CORE 92;
Leg : 61 Top/Bottom Interval(mm): 0/1480 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 625.48
Core: B 1 Top of Core Depth (m) : 624.00
Sect: 1 Top of Section Depth(m): 624.00
LITHOLOGY: MASSIVE BASALT SILL (DOLERITE);
BIT CORE;
Piece No. : PCE NO PCE NUMBERS ASSIGNED;
Structure : MASSIVE BASALT SILL, VEIN MATERIAL NOT VISIBLE TO
Texture : THE UNAIDED EYE;
RELATIVELY COARSE-GRAINED DOLERITIC ROCK,
IN INTERVAL (20-30) IS PCE WITH THE COARSEST GRAIN
SIZE, FEW (<1%) CPX PHENOS (1MM IN SIZE);
Alteration : SLIGHTLY
ALTERATION IS NOT VISIBLE TO THE UNAIDED EYE;
Comments : NONE OF THE PCES ARE ORIENTED AND THEIR RELATIVE
STRATIGRAPHIC POSITION IS NOT KNOWN EITHER;
Phenocrysts: CLINOPYROXENE ( <1%)
Size(mm): 1
FEW CPX PHENOS;
Leg : 61 Top/Bottom Interval(mm): 0/ 200 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 625.70
Core: B 1 Top of Core Depth (m) : 624.00
Sect: 2 Top of Section Depth(m): 625.50
LITHOLOGY: CPX SPARSELY PHYRIC BASALT;
DOLERITE;
CORE CATCHER SAMPLE OF BIT CORE;
Piece No. : PCE NO PCE NUMBERS ASSIGNED;
Structure : MASSIVE BASALT SILL, CALCITE-CHLORITE VEINS;
Texture : SPARSELY PHYRIC;
Phenocrysts: CLINOPYROXENE ( 1%)
Size(mm): 1
Replacement: CALCITE
IN VEINS;
CHLORITE
IN VEINS;
Leg : 61 Top/Bottom Interval(mm): 0/1070 Analyst: Tokuyama, H.
Hole: 462A Sample Midpoint (m) : 691.07
Core: B 2 Top of Core Depth (m) : 690.00
Sect: 1 Top of Section Depth(m): 690.00
LITHOLOGY: CPX-PLAG MICROPHYRIC BASALT (DOLERITE SILL);
Piece No. : PCE 1 (1-6), 2 (10-16), 3 (20-27), 4 (30-37),
5 (40-45), 6 (48-51), 7 (56-60), 8 (64-78),
9 (80-92), 10 (95-105);
Structure : DOLERITE SILL WITH CHLORITE VEINS;
Texture : GRAINED AND HOLOPILITIC, PCES 4-7 ARE MEDIUM-GRAINED
AND ARE INTERSERTAL, PCE 8+10 ARE MEDIUM TO SLIGHTLY
COARSE-GRAINED AND ARE INTERSERTAL TO
INTERGRANULAR;
Alteration : SLIGHTLY;
Comments : ORIENTATION AND STRATIGRAPHIC ORDER ARE NOT KNOWN
FOR THE PCES RECOVERED;
Phenocrysts: CLINOPYROXENE
MICROPHENOS;
PLAGIOCLASE
MICROPHENOS;
Groundmass : CLINOPYROXENE
MICROLITES;
PLAGIOCLASE
MICROLITES;
MAGNETITE
MICROLITES, IN ADDITION PCES 1+2 ALSO HAVE
MICROLITES OF PLAG;
Replacement: CHLORITE
Leg : 61 Top/Bottom Interval(mm): 0/ 300 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 946.30
Core: X 1 Top of Core Depth (m) : 946.00
Sect: 1 Top of Section Depth(m): 946.00
LITHOLOGY: BASALT AND DIABASE FRAGMENTS;
Piece No. : PCE 1 (0-30);
Texture : 9 FRAGMENTS OF BASALTIC ROCK, 8 ARE MEDIUM-GRAINED
DIABASE SIMILAR TO THAT OF CORE 73 AND ONE PCE IS
FINE-GRAINED BASALT SIMILAR TO THAT OF CORE 72;
Comments : NONE OF THESE PCES HAVE ORIENTATION OR
STRATIGRAPHIC POSITION, THEY WERE COLLECTED IN
TOOL FISHING OPERATION;
Leg : 61 Top/Bottom Interval(mm): 30/0430 Analyst: Robinson, P.T.
Hole: 462A Sample Midpoint (m) : 946.43
Core: X 1 Top of Core Depth (m) : 946.00
Sect: 1 Top of Section Depth(m): 946.03
LITHOLOGY: SEDIMENTARY ROCK;
Piece No. : PCE 2 (30-43);
Comments : SMALL (0.5-2CM) PCES OF SEDIMENTARY ROCK;
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