Leg : 43 Top/Bottom Interval(mm): 1120/1500 Analyst: Houghton, R.
Hole: 384 Sample Midpoint (m) : 326.30
Core: 22 Top of Core Depth (m) : 324.80
Sect: 1 Top of Section Depth(m): 325.92
LITHOLOGY: PYX-PLAG MOD PHYRIC BASALT;
Piece No. : PCE 1 (112-114), 2 (112-127), 3 (129-140),
4 (141-150);
Texture : PYX-PLAG MOD PHYRIC, HYPOXTLN,SLICKENSIDES COMMON IN
INTERVAL (141-150), ESPECIALLY WELL-ENVELOPED ON
EPIDOTE;
Structure : COMMON VEINING WITH CALCITE, AT (119-120) MAJOR
CALCITE VEIN 11MMX32MM, FURTHER SPOTS OF CALCITE
AROUND CORE ALONG STRIKE INDICATES VEIN MAY BE
CONTINUOUS, 5-20% SLIGHTLY ELLIPTICAL AMYGDULES
OF CALCITE AND/OR MONTMORILLONITE;
Alteration : MOD
INTERVAL (112-114) N4 MEDIUM DARK GRAY WITH MINOR
N3 DARK GRAY WHERE DEGREE OF ALTERATION VARIES;
Comments : ALL COLORS ARE WET, INTERVAL (112-114) IS N4
(MEDIUM DARK GRAY) WITH MINOR N3 DARK GRAY,INTERVAL
(114-128) IS N3 DARK GRAY BECOMING GRADUALLY
DOMINANT DOWN CORE AND INCREASING THROUGH INTERVAL
(128-141), AT INTERVAL (141-150) N3 (DARK GRAY) IS
DOMINANT;
Vesicles : Size(mm): Percent: 5-10
Location: Filling:
Shape : ELLIPTICAL
VESICLES COMMONLY ALTERED ALONG LININGS TO IRON
OXIDES FOLLOWED BY THIN CONFORMABLE LAYER OF A
CLEAR TO WHITE MINERAL (CALCITE) AND MONT
FOLLOWED BY CALCITE,LARGE VUG FILLED WITH CALCITE
AT (131-132), VESICLES AT (112-114) WHOLLY OR
PARTLY FILLED WITH 5G5/1 (MEDIUM GREENISH GRAY)
EPIDOTE AND/OR N9 (WHITE) CALCITE, AT (138-141)
A VUG (2.3X1.6CM) IS FILLED WITH EPIDOTE AND
CALCITE;
Phenocrysts: PYROXENE ( 8-15%)
Size(mm): 0.4-1.4
IN THIN-SECTION COLORLESS TO PALE PURPLISH BROWN,
SUBHEDRAL &BROKEN and CORRODED PRISMATIC CRYSTALS
OF AUGITE, PARTLY ALTERED TO AMPHIBOLE;
PLAGIOCLASE ( <1%)
Size(mm): 0.5-0.8
Groundmass : PYROXENE (10-20%)
Replacement: CALCITE
CHLORITE
AMPHIBOLE
Minerals Replaced: PYX
EPIDOTE
MONTMORILLONITE
ZEOLITE
FERROUS MN OXIDE
Leg : 43 Top/Bottom Interval(mm): 0/1500 Analyst: Houghton, R.
Hole: 384 Sample Midpoint (m) : 327.80
Core: 22 Top of Core Depth (m) : 324.80
Sect: 2 Top of Section Depth(m): 326.30
LITHOLOGY: PYX-PLAG MOD PHYRIC BASALT;
SIMILAR TO SECTION 22-1;
Piece No. : PCE 1 (-24), 2 (24-30), 3 (31-41), 4 (41-48),
5 (47-55), 6 (55-61), 7 (60-64), 8 (64-74),
9 (74-88), 10 (88-94), 11 (95-100), 12 (101-118),
13 (118-121), 14A (127-132), 14B (127-130),
15 (133-143), 16 (143-150);
Structure : CALCITE VEIN 0.5CM THICK IN PCE 3, CALCITE &
IRON OXIDE and EPIDOTE IN VEIN AT CONTACT OF UPPER
SURFACE OF PCE 7, ABUNDANT VEINS IN PCE 8, IN PCE
12 A THIN (<1MM) CALCITE VEIN CONNECTS VESICLES AND
FORMER CRYSTAL POSITIONS,CALCITE VEINS IN PCES
15&16,AMYGDULES IN PCES 1-8 ARE MAINLY FILLED
WITH 5GY2/1 (GREENISH BLACK) EPIDOTE, IN PCE 9
AMYGDULES ARE FILLED WITH PINK CALCITE AND LESS
EPIDOTE, IN PCE 4 NATURE OF AMYGDULES CHANGES
SLIGHTLY-EPIDOTES ARE BLUER AND IRON OXIDE STAINS
(5YR3.5/4 MOD BROWN) BEGIN TO APPEAR AROUND
AMYGDULE RIMS, THIS STAINING BECOMES MORE DOMINANT
DOWNWARD;
Texture : MOD PHYRIC, UPPER SURFACE OF PCE 8 DISPLAYS
SLICKENSIDES ON AN ALTERED SURFACE DOMINATED BY
EPIDOTE AND IRON OXIDES,LARGE CALCITE VEIN
INCLUSION CONTAINING REDDISH IRON OXIDE
CONCENTRATION AND ANHEDRAL CRYSTALS OF MAGNETITE(?),
PCES 10-12 + 14 SIMILAR TO PCE 9,PCE 16 IS SIMILAR
TO PCE 15;
Alteration : MOD
PCE 8,ABRUPT COLOR CHANGE AT PCE 9,10YR1/2 (DARK
YELLOWISH BROWN) COLOR CHANGE FROM ABOVE INDICATES
FOUR DIFFERENT EXTENTS OF WEATHERING FROM 74-143
CM, CONTACT BETWEEN IS MISSING;
EXT
PCS 15+16;
Comments : FOR DETAILS SEE COMPOSITE THIN SECTION DESCRIPTION;
Vesicles : Size(mm): Percent: 10-15
PCE 2, IN PCE 8 VESICLES LARGE AND EDGES
IRREGULAR AS IF WEATHERED OUT;
Size(mm): 1 Percent:
MINOR VESICLES IN PCE 8;
Size(mm): 1-6 Percent:
IN PCE 9, SMALLER THAN PCE 8, AVERAGE 3MM;
Replacement: EPIDOTE
CALCITE
FERROUS MN OXIDE
Leg : 43 Top/Bottom Interval(mm): 930/1500 Analyst: Houghton, R.
Hole: 384 Sample Midpoint (m) : 329.30
Core: 22 Top of Core Depth (m) : 324.80
Sect: CC Top of Section Depth(m): 328.73
LITHOLOGY: PYX-PLAG MOD PHYRIC BASALT;
SIMILAR TO CORE 22 SECTION 1;
Piece No. : PCE 1 (93-103), 2 (103-108), 3 (108-113),,
4 (113-118), 5 (118-125), 6 (125-131),
7 (131-144), 8 (144-150);
Structure : IN PCE 2 A CALCITE VEIN CONTAINING EPIDOTE CUTS
DIAGONALLY ACROSS SPECIMEN, CALCITE VEIN AT BASE
OF SPECIMEN, AMYGDULES OF EPIDOTE INCREASING
RELATIVE TO CALCITE FILLINGS IN PCE 6, IN PCE 8
0.5CM AMYGDULES FILLED WITH EPIDOTE AND MINOR
CALCITE CENTERS COMMON, PCE 1 IS COMPOSED OF ROCK
FRAGMENTS,PCES 5+7 ARE MIXED GROUND BASALT
FRAGMENTS;
Texture : TEXTURE AND MINERALOGY SIMILAR TO CORE 22 SECTION 1,
BASE OF PCE 3 COATED WITH CALCITE+SPECULAR HEMATITE
AND IRON OXIDE;
Alteration : LESS ALTERED THAN BASALT FROM CORE 22 SECTION 1
AND SECTION 2 (PCES 1-8);
Comments : PCE 2 IS 10YR3/2 DARK YELLOWISH BROWN ALTERED
BASALT APPEARS TO BE CONTINUOUS WITH CORE 22
SECTION 2 (PCES 9-16), PCE 4 IS 5YR3/4 (MOD BROWN),
PCE 8 IS N2.5 (DARK GRAYISH BLACK), PCE 5 MIXED
GROUND BASALT FRAGMENTS-UPHOLE CONTAMINATION
ABUNDANT,CONTAINS MIOCENE NANNOS;
Vesicles : Size(mm): <5 Percent:
Location: Filling: CALCITE,EPIDOTE,
Location: Filling: CHLORITE
IN PCE 2, IN PCE 3 THERE IS A CALCITE FILLED VUG
ON RIGHT SIDE LOOKING UP CORE;
Replacement: CALCITE
IN VEINS and VESICLES AND COATING BASE OF PCE 3;
EPIDOTE
IN VEINS AND VESICLES;
CHLORITE
IN VESICLES;
HEMATITE
SPECULAR HEMATITE, COATING BASE OF PCE 3;
FERROUS MN OXIDE
COATING BASE OF PCE 3;
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