Leg : 16 Top/Bottom Interval(mm): 130/ 170 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 276.17
Core: 28 Top of Core Depth (m) : 276.00
Sect: 1 Top of Section Depth(m): 276.13
LITHOLOGY: CHALK;
Piece No. : PCE NO PCE NUMBER ASSINGED;
Leg : 16 Top/Bottom Interval(mm): 170/ 460 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 276.46
Core: 28 Top of Core Depth (m) : 276.00
Sect: 1 Top of Section Depth(m): 276.17
LITHOLOGY: BASALT;
Piece No. : PCE 1 (17-30), 2 (30-40), 3 (40-46);
Texture : GRADES ACROSS 10CM FROM GLASSY ON TOP (2CM) TO
FINE-GRAINED, APPARENT INCREASE IN XTLINITY
DOWNWARD, PCE 3 HAS DIABASIC TEXTURE ON FRESH
FRACTURE AND REST OF ROCK IS HOLOXTLINE;
Structure : FLOW UNIT 1,
CONCHOIDAL FRACTURE CUT BY SUBHORIZONTAL BRAIDED
VEINS, IRREGULAR CALCITE VEINS 0.25 TO 2MM WITH
GREEN MINERAL (CHLORITE?);
Alteration : INCREASED ALTERATION NEXT TO VEIN IN PCE 1 TO
MODERATE YELLOWISH-BROWN (10YR 5/4);
Comments : GLASSY TOP DIPS 20 DEGREES, BLACK, VITREOUS, VEINS
FILLED WITH UNIDENT DARK GREENISH-YELLOW (10Y 6/6)
RIMMED WITH PALE OLIVE (10Y 6/2) TO DUSKY YELLOW
(5Y 6/4) NEAR GLASS, PCE 3 IS BROWNISH-GRAY
(5YR 4/1) TO BROWNISH-BLACK (5YR 2/1);
Phenocrysts: PLAGIOCLASE
Size(mm): TO 1
IN PCE 1;
Groundmass : PLAGIOCLASE
FELTY NETWORK OF NEEDLE-LIKE LATHS;
PLAGIOCLASE
Size(mm): TO 2
EARTHY WHITE LATH LIKE MINERAL IN TOP 10CM OF
PCE 1, INCREASINGLY CONCENTRATED AT TOP
BELOW GLASS, COULD ALSO BE ZEOLITE;
OTHER
Size(mm): TO 1
MAFIC XTLS;
Replacement: CHLORITE
POSSIBLY IN IRREGULAR VEINS OF PCE 1;
CALCITE
FILLING VEINS IN PCE 1;
ZEOLITE
Size(mm): TO 2
EARTHY WHITE LATH LIKE MINERAL IN TOP 10CM OF
PCE 1, INCREASINGLY CONCENTRATED AT TOP
BELOW GLASS, COULD ALSO BE ZEOLITE;
UNIDENTIFIED
FILLING BRAIDED VEINS IN PCE 1;
Leg : 16 Top/Bottom Interval(mm): 460/1110 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 277.11
Core: 28 Top of Core Depth (m) : 276.00
Sect: 1 Top of Section Depth(m): 276.46
LITHOLOGY: BASALT;
Piece No. : PCE 4 (46-53), 5 (53-60), 6 (60-69), 7 (69-72),
8 (72-85), 9 (84-89), 10 (89-107), 11 (107-111);
Texture : GLASSY TOP, AS IN FLOW UNIT 1, PCES 4 AND 11 ARE
APHANITIC, PCES 7-10 HAVE A FELTY TEXTURE;
Structure : FLOW UNIT 2, LACKS GREENISH VEINS, CALCITE VEINS UP
TO 3MM;
Alteration : ALTERATION OF CALCITE VEINS AS IN UNIT 1, NEXT TO
VEINS BASALT IS ALTERED TO MODERATE YELLOWISH
BROWN (10YR 5/4), PROBABLY ALL OF UNIT HAS
UNDERGONE ALTERATION;
Comments : DIP ON GLASSY TOP IS MODERATE, GRADES ABRUPTLY FROM
MEDIUM GRAY TO MEDIUM DARK GRAY (N6-N5), CALCITE
VEINS ARE YELLOWISH GREEN AND LIGHT BROWN AND LIGHT
OLIVE;
Phenocrysts: OTHER
MAFIC PHENOS IN PCE 4 AND RARE MAFIC
MICROPHENOS IN PCES 7-10;
PLAGIOCLASE
RARE MICROPHENOS IN PCES 7-10;
Groundmass : PLAGIOCLASE
Size(mm): TO 1
UNCOMMON IN PCE 4 BUT INCREASED LATHS IN PCES 5
AND 6;
Replacement: CALCITE
IN VEINS
Leg : 16 Top/Bottom Interval(mm): 1110/1240 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 277.24
Core: 28 Top of Core Depth (m) : 276.00
Sect: 1 Top of Section Depth(m): 277.11
LITHOLOGY: BASALT;
Piece No. : PCE 12 (111-116), 13 (116-124);
Texture : GLASSY TOP GRADED TO FINE-GRAINED AHPHANITIC;
Structure : FLOW UNIT 3, ANASTOMOSING VEINS OF CALCITE AT LEAST
1CM THICK, IN ALTERED BASALT VEINS ARE UP TO 1MM
THICK;
Alteration : GRADES INTO ALTERED BASALT FROM GLASSY TOP;
Comments : GLASSY TOP DIPS 50 DEGREES, THICK CALCITE VEINS ARE
GRAYISH OLIVE (10Y 4/2) TO MODERATE YELLOWISH
BROWN (10YR 6/4), BASAL GLASS GRADATIONAL CONTACT
WITH ALTERED BASALT, ALTERED BASALT ALTERNATES
GRAY AND BROWN, BASAL CONTACT WITH GLASS PRESERVED
IN PCE 13;
Phenocrysts: UNIDENTIFIED
Size(mm): 0.5
FEW;
Leg : 16 Top/Bottom Interval(mm): 1240/1500 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 277.50
Core: 28 Top of Core Depth (m) : 276.00
Sect: 1 Top of Section Depth(m): 277.24
LITHOLOGY: BASALT;
Piece No. : PCE 14 (124-133), 15 (133-143), 16 (143-150);
Texture : GLASSY TOP, APHANITIC IN PCE 14 BUT INCREASINGLY
MICROPORPHYRITIC (FELTY AND NEEDLELIKE);
Structure : FLOW UNIT 4, GREEN VEINS AND CALCITE PARALLEL TO
CONTACT IN PCE 14, BOTH HORIZONTAL AND VERTICAL
VEINS UP TO 4MM IN PCE 16, VERTICAL CUTS HORIZONTAL
AND HAVE GREEN FRINGE;
Alteration : GRADES DOWNWARD ABRUPTLY TO ALTERED BASALT IN
PCE 14, BROWN ALTERATION SPREADS FROM CALCITE
VEINS;
Comments : GLASSY TOP AT LEAST 1CM THICK, DIPS 65 DEGREES IN
PCE 13 AND 35 DEGREES IN PCE 14, ALTERED BASALT
GRADES DOWNWARD ABRUPTLY TO GRAY AND BROWN IN
PCE 14, PCE 16 IS GRAYISH ORANGE (10YR 7/4) TO MUD
YELLOW BROWN (10YR 5/4);
Phenocrysts: UNIDENTIFIED
MICROPHENOS IN PCE 14;
Groundmass : PLAGIOCLASE
FELTY, NEEDLE-LIKE LATHS;
Replacement: UNIDENTIFIED
GREEN MINERAL IN VEINS OF PCE 14;
CALCITE
FOUND NEAR CONTACTS IN PCE 14;
Leg : 16 Top/Bottom Interval(mm): 570/1010 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 286.01
Core: 29 Top of Core Depth (m) : 285.00
Sect: 1 Top of Section Depth(m): 285.57
LITHOLOGY: BASALT;
Piece No. : PCE 1 (57-70), 2 (70-74), 3 (74-81), 4 (81-90),
5 (90-96), 6 (96-98), 7 (97-101);
Texture : PCE 1 IS APHANITIC, SOME SOFT ANGULAR FRAGMENTS IN
LOWER PCES;
Structure : PROBABLY A CONTINUATION OF FLOW UNIT 4 FORM CORE 28,
CUT BY CALCITE VEINS UP TO 4MM IN PCE 1, TOP OF
PCE 7 IS AN "INTRUSIVE BRECCIA";
Alteration : ALTERATION SPREADS FROM CALCITE VEIN PERVASIVELY
THRU ROCK, VEINS FROM 1MM , GREENISH CAST ON
"FRESH" TOP SURFACE INDICATES ALTERATION
ALTHOUGH MINIMAL;
Comments : BASALT IS MEDIUM DARK GRAY (N6) TO LIGHT OLIVE GRAY
(5Y 6/1), LOCAL FRACTURE CONTACTS OF EARTHY GRAYISH
BLUE GREEN (5BG 5/2) MATERIAL (CHLORITE?), PCE 1 IS
OLIVE GRAY (5Y 4/1), "INTRUSIVE BRECCIA" VEIN IS
CALCITE AND GREENISH GRAY (5G 6/1) CHLORITIC
APHANITIC MATERIAL IN COUNTRY ROCK OF BROWN ALTERED
BASALT, FRAGMENTS ARE DARK GREENISH GRAY (5G 4/1)
UP TO 1CM LONG AND SOMETIMES RECTANGULAR;
Vesicles : VESICLES OFTEN FOUND IN THE CENTERS OF FRAGMENTS;
Groundmass : PLAGIOCLASE
Size(mm): TO 1
PROBABLY, COLORLESS LATHS IN PCE 1;
Replacement: CHLORITE
POSSIBLY AT FRACTURE CONTACTS;
CALCITE
FOUND IN "INTRUSIVE BRECCIA" VEIN IN PCE 7 AND
ALSO IN VEINS IN PCE 1;
CHLORITE
APHANITIC MATERIAL FOUND IN "INTRUSIVE BRECCIA" VEIN IN PCE 7;
Leg : 16 Top/Bottom Interval(mm): 1010/1360 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 286.36
Core: 29 Top of Core Depth (m) : 285.00
Sect: 1 Top of Section Depth(m): 286.01
LITHOLOGY: BASALT;
Piece No. : PCE 8 (101-112), 9 (106-135), 10 (134-136);
Texture : GLASSY TOP, BASALT BELOW IS APHANITIC, ABSENCE OF
GLASS IN PCES 9 AND 10, POSSIBLE FLOW TOP FORMED
THE AVENUE FOR A CALCITE VEIN, BUT GLASS IN COUNTRY
ROCK SUGGESTS A FLOW BOUNDARY;
Structure : FLOW UNIT 5 IN SEQUENCE FROM 28-1,
GREENISH VEINS DIP AT HIGH ANGLE TO GLASS CONTACT,
VEIN DIPS 70 DEGREES AT ITS BASE IN PCE 11;
Alteration : STRONGLY ALTERED, GREENISH GRAY (5GY 6/1) WHERE
FRESHEST AND MODERATE YELLOWISH BROWN (10YR 5/4)
NEAR CALCITE VEINS AND FOR TOP 2CM;
Comments : BLACK, GLASSY TOP IS 1CM THICK AND DIPS 15 DEGREES,
IN PCES 9 AND 10 CALCITE VEIN IS GREENISH GRAY
(5GY 6/1), 4CM THICK WITH ANGULAR CLASTS OF GLASSY
BASALT 0.5 TO 2CM ACROSS AND ALSO A FEW CLASTS OF
BROWN ALTERED BASALT;
Replacement: CALCITE
IN VEINS;
Leg : 16 Top/Bottom Interval(mm): 1350/1500 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 286.50
Core: 29 Top of Core Depth (m) : 285.00
Sect: 1 Top of Section Depth(m): 286.35
LITHOLOGY: BASALT;
Piece No. : PCE 11 (135-150);
Texture : GLASS IN COUNTRY ROCK AND TO CALCITE VEIN IN TOP
OF PCE, APHANITIC GROUNDMASS;
Structure : FLOW UNIT 6 CONTINUATION OF CORE 28-1;
Alteration : ALTERATION LIKE FLOW UNIT 5 (CORE 29-1);
Comments : THIS IS SEPARATED OUT BASE, BLACK, GRAIN SIZE LIKE
FLOW UNIT 5 (CORE 29-1);
Phenocrysts: UNIDENTIFIED
FEW MICROPHENOS;
Leg : 16 Top/Bottom Interval(mm): 0/1500 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 288.00
Core: 29 Top of Core Depth (m) : 285.00
Sect: 2 Top of Section Depth(m): 286.50
LITHOLOGY: BASALT;
Piece No. : PCE 1 (0-3), 2 (0-4), 3 (3-12), 4 (12-19),
5 (19-26), 6 (26-33), 7 (33-35), 8 (35-38),
8A (38-52), 9 (53-62), 10 (63-67), 11 (67-70),
12 (70-90), 13 (90-104), 14 (104-111),
15 (104-116), 16 (111-116), 17 (116-120),
18 (116-125), 19 (118-130), 20 (125-132),
21 (130-135), 22 (132-137), 23 (135-138),
24 (136-150);
Texture : NO GLASS IN SECTION, FINE-GRAINED THOUGHOUT, NO
FELTY TEXTURE IN PCE 5, SOME FRAGMENTS IN PCES 6
AND 7, FELTY TEXTURE BEGINS IN PCE 8 AND IS
THROUGH REST OF PCES, TALCOSE FEEL TO VEINS IN
PCES 9 AND 10;
Structure : FLOW UNIT 6 CONTINUED FROM SECTION 29-1, CALCITE
VEINS AND GRAYISH-OLIVE (10Y 4/2) STAINED FRACTURE
SURFACES IN PCES 1-3, IN PCE 8 GRAYISH-GREEN
(5G 5/2) DULL, FRACTURES AND VEINS IN PCES 9 AND 10,
0.5 TO 2MM;
Alteration : ALTERED IN PCES 1-24, PCES 6 AND 7 HIGHLY ALTERED,
GREEN ALTERATION THOUGHOUT PCE 8 (CHLORITE), LESS
ALTERATION SEEN IN PCE 8A EXCEPT ALONG CALCITE
VEINS AND LESS ALTERATION DOWNWARD;
Comments : PCES 1-3 OLIVE-GRAY (5Y 4/1) TO OLIVE BLACK
(5Y 2/1), MODERATE YELLOW-BROWN (10YR 2/1)
ASSOCIATED WITH CALCITE VEINS UP TO 2MM, CALCITE
VEINS IN PCE 8 ARE UP TO 1CM ACROSS, PCE 8A IS
GREENISH-GRAY (5GY 6/1) TO MED LIGHT (N6-N5),
GREENISH-GRAY (5GY 6/1) VEINS AND GRAYISH RED
(5R 4/2) ALONG SOME FRACTURES IN PCE 9, PCE 10 IS
DARK GRAY (N3), CALCITE VEINS STAINED 5R 4/2 AND
LIGHT GREENISH-GRAY (5GY 8/1), PCE 12 IS LIGHT
GRAY (N7), GREENISH GRAY (5GY 6/1) AND MED DARK
GRAY (N4), PCES 13-24 FOLLOW AS ABOVE;
Phenocrysts: PLAGIOCLASE
IN PCES 1-3 COLORLESS PHENOS, PROBABLY PLAG, SOME
PRISMATIC, SOME LATH LIKE;
PLAGIOCLASE
Size(mm): 1-2
PCE 5 EUHEDRAL, PCE 8A NEEDLE-LIKE, INCREASING
DOWNWARD;
PYROXENE
Size(mm): TO 2
SOME OF 2MM DARK PHENOS MAYBE PYX;
Groundmass : OTHER
MAFIC BASALT;
PLAGIOCLASE
LATHS IN PCE 8;
Replacement: CALCITE
THROUGHOUT IN VEINS;
Leg : 16 Top/Bottom Interval(mm): 0/1500 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 289.50
Core: 29 Top of Core Depth (m) : 285.00
Sect: 3 Top of Section Depth(m): 288.00
LITHOLOGY: BASALT;
Piece No. : PCE 1 (0-7), 2 (4-11), 3 (5-29), 4 (25-27),
5 (24-45), 6 (45-56), 7 (54-78), 8 (76-93),
9 (93-104), 10 (94-115), 11 (107-134), 12 (134-140),
13 (140-150);
Texture : FELTY TEXTURE ON FRESH FRACTURES, TALCOSE FEEL ON
NATURAL FRACTURE SURFACES;
Structure : CONTINUATION OF FLOW UNIT 6 FROM 29-2, RARE 1MM
CALCITE FRACTURES;
Alteration : ALTERATION SURFACES ARE AT MOST NATURAL FRACTURES;
Comments : GREENISH-GRAY (5GY 6/1) TO MED LIGHT GRAY (N6),
LIGHT BROWN (5YR 5/6) AND GREENISH STAINS ON CALCITE
VEINS, AT FRACTURE SURFACES GREENISH-GRAY COLOR
(5G 6/1 TO 8/1) OR GREENISH-BLACK (5GY 2/1),
POSSIBLY FINE-GRAINED PYRITE IN PCE 10;
Phenocrysts: PLAGIOCLASE
Size(mm): 1-3
MAYBE,COLORLESS OR DARK, ANHEDRAL AND LARGER, MORE
STUBBY PHENOS 3MM ACROSS;
Groundmass : PLAGIOCLASE
Size(mm): 1-2
NEEDLE-LIKE LATHS;
Replacement: CALCITE
IN VEINS;
PYRITE
POSSIBLY IN ALTERATION SURFACES;
Leg : 16 Top/Bottom Interval(mm): 0/1450 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 290.95
Core: 29 Top of Core Depth (m) : 285.00
Sect: 4 Top of Section Depth(m): 289.50
LITHOLOGY: BASALT;
Piece No. : PCE 1 (0-48), 2 (46-84), 3 (83-123), 4 (123-132),
5 (133-145);
Texture : FELTY TEXTURE THROUGH PCE 3, BEGINS TO DISAPPEAR
DOWNWARD AT ABOUT 120CM, SUGARY TEXTURED IN LOCAL
IRREGULAR AREAS, PCE 5 APHANITIC, POSSIBLY GLASSY,
(ZONE ABOUT 10CM THICK);
Structure : CONTINUATION OF FLOW UNIT 6 FROM 29-3, 0.5 TO 1MM
SUBHORIZONTAL CALCITE VEINS IN PCE 3, UP TO 3MM IN
PCE 4, 1CM CURVED CONCHOIDAL FRACTURE AT BOTTOM OF
SECTION, PCE 5 CALCITE VEINS PARALLEL TO BEDDING,
DIP 30 DEGREES, 0.5 TO 1MM;
Alteration : HIGHEST ALTERATION IN PCE 3, APPEARS TO FOLLOW
CALCITE VEINS, PCE 4 ALSO ALTERED;
Comments : LIGHT GRAY (N7), MED LIGHT GRAY (N6), LOCALLY
GREENISH-GRAY (5G 6/1), ON NATURAL FRACTURE
SURFACES PALE OLIVE (10Y 6/2) AND GREENISH-BLACK
(5GY 2/1), PCE 3 IS ALTERED TO PALE OLIVE (10Y 5/4),
EDGE OF THIS IS MODERATE YELLOWISH-BROWN (10YR 5/4),
PCE 4 LIGHT OLIVE-GRAY (5Y 4/1), MED GRAY (N5),
FRESHEST FRACTURES ARE OLIVE GRAY (5Y 4/1), PCE 5
TOP LIKE PCE 4, GRADES DOWN MED GRAY TO DARK GRAY
(N5-N3), 1CM BLACK GLASS, DULL TO SHINY;
Phenocrysts: PLAGIOCLASE
STUBBY, FEW LATHS PCES 4 AND 5;
Groundmass : PLAGIOCLASE
Size(mm): 1-2
LATHS
PLAGIOCLASE
Size(mm): TO 3
LESS LATH-LIKE, LOCAL IRREGUALAR AREAS 2-10MM ARE
DARKER DUE TO LESS PLAG PHENOS;
Replacement: CALCITE
IN VEINS;
Leg : 16 Top/Bottom Interval(mm): 0/ 380 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 291.38
Core: 29 Top of Core Depth (m) : 285.00
Sect: 5 Top of Section Depth(m): 291.00
LITHOLOGY: BASALT;
Piece No. : PCE 1 (0-8), 2 (6-16), 3 (16-28), 4 (26-38),
Texture : APHANITIC, FELTY TEXTURE BUT MUCH FINER-GRAINED THAN
FLOW UNIT 6;
Structure : FLOW UNIT 7, FOLLOWING SECT 29-4, HORIZONTAL CALCITE
VEIN 15MM THICK IN PCE 1, MANY CALCITE VEINS
0.5-1MM, VERTICAL AND HORIZONTAL THROUGHOUT;
Alteration : ALTERED;
Comments : PCE 1, PALE YELLOWISH BROWN (10YR 6/2), GREENISH
GRAY (5GY 6/1), LESS ALTERED AREA OF PCE 3 MEDIUM TO
LIGHT GRAY (N6), PCE 4 OLIVE GRAY (5Y 6/1) AND
MEDIUM LIGHT GRAY (N6);
Phenocrysts: PLAGIOCLASE
Size(mm): .5
STUBBY PHENOS IN PCES 1 AND 2, ALSO PRESENT IN
PCE 4 BUT MORE ABUNDANT;
Groundmass : PLAGIOCLASE
LATHS;
Leg : 16 Top/Bottom Interval(mm): 0/ 0 Analyst: Yeats, R.S.
Hole: 163 Sample Midpoint (m) : 292.60
Core: 29 Top of Core Depth (m) : 285.00
Sect: CC Top of Section Depth(m): 292.60
LITHOLOGY: BASALT;
Piece No. : PCE 1 (39-47), 2 (39-50), 3 (47-51), 4 (50-53),
5 (53-62);
Texture : FINE-GRAINED;
Comments : SIMILAR TO SECTION 29-5;
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