Leg : 64 Top/Bottom Interval(mm): 0/ 750 Analyst: Fornari, D.
Hole: 475 Sample Midpoint (m) : 158.75
Core: 18 Top of Core Depth (m) : 158.00
Sect: 1 Top of Section Depth(m): 158.00
LITHOLOGY: POLYGENETIC BOULDER TO COBBLE CONGLOMERATE;
Piece No. : PCE 1 (0-5), 2 (7-10), 3 (12-15), 4 (17-21),
5 (18-23), 6 (29-35), 7 (37-41), 8 (42-50),
9 (52-58), 10 (60-63), 11 (64-75);
Comments : PCE 1: METAVOLCANICS,FINE-GRAINED, LIGHT MED. GRAY,
THIN SUB-PARALLEL QUARTZ-FILLED FRACTURES (<1MM),
ORTHOGONAL JOINT PATTERN;
PCE 2: METAQUARTZITE, LIGHT BEIGE;
PCE 3 & 4: LOW-GRADE QUARTZ SANDSTONE, COARSE-
GRAINED, 1-2MM, PEPPERED-GREEN;
PCE 5: METAVOLCANIC, GREENISH-GRAY;
PCES 6 & 7 & 8 & 11: METAMORPHOSED GRAIN-SUPPORTED
CONGLOMERATE,LARGE FRACTURED CLASTS OF FELDSPAR,
QUARTZ, VOLCANICS AND LATH-SHAPED CLASTS TO 1 CM,
REDDISH HUE;
PCES 9 & 10: COARSER-GRAINED THAN PCES 3 & 4,
APPEARS TO BE METAMORPHOSED MEDIUM-GRAINED,
POORLY SORTED GRAYWACKES;
Leg : 64 Top/Bottom Interval(mm): 0/ 470 Analyst: Fornari, D.
Hole: 475 Sample Midpoint (m) : 167.97
Core: 19 Top of Core Depth (m) : 167.50
Sect: 1 Top of Section Depth(m): 167.50
LITHOLOGY: POLYGENETIC BOULDER TO COBBLE CONGLOMERATE;
COBBLES VARY FROM METAVOLCANIC TO METASEDIMENTARY
ROCK OF MEDIUM-GRADE METAMORPHISM;
Piece No. : PCES 1 (0-4), 2 (7-10), 3 (12-17), 4 (19-21),
5 (22-27), 6A & 6B (28-30), 7 (32-35), 8 (37-41),
9 (42-47);
Comments : PCE 1: METAGRAYWACKE SIMILAR TO PCES 3 AND 4 IN
CORE 18-1;
PCE 2: GRAYISH-ORANGE PINK (5YR 7/2), SUBROUNDED
COBBLE WITH QUARTZ AND FELDSPAR CRYSTALS RANDOMLY
SET IN THE PINKISH,FINE-GRAINED MATRIX;
PCE 3: STRONGLY BANDED PINKISH GRAY TO GRAY-BLUE
BANDS, POSSIBLY AN IGNIMBRITE;
PCE 4: SMALL PEBBLE SIMILAR TO PCE 1;
PCE 5: LIGHT GRAY METAVOLCANIC?;
PCES 6A AND 6B: SMALL,MODERATE BROWN (5YR 3/4)
PURPLISH PEBBLE;
PCE 7: PALE RED (10R 6/2) COBBLE WITH LIGHT COLORED
INCLUSIONS (NOT CRYSTALS);
PCE 8: COARSE-GRAINED ROCK,GRAYISH, COMPOSED OF
SUBROUNDED ROCK CLASTS (2-5MM) CRUDELY ALIGNED AT
TIMES;
PCE 9: GRAYISH-PALE RED (10R 6/2),FINE-GRAINED ROCK
WITH FELDSPAR CLASTS,SUBHEDRAL TO ANHEDRAL, SET IN
GRAYISH-PINKISH FINE MATRIX WITH BIOTITE FLAKES IN A
IN A CRUDE, POORLY-DEFINED PARALLEL ALIGNMENT;
Leg : 64 Top/Bottom Interval(mm): 0/ 820 Analyst: Fornari, D.
Hole: 475 Sample Midpoint (m) : 177.82
Core: 20 Top of Core Depth (m) : 177.00
Sect: 1 Top of Section Depth(m): 177.00
LITHOLOGY: COBBLES TO PEBBLES OF VOLCANIC-SEDIMENTARY ROCK
SHOWING LOW TO MEDIUM GRADE METAMORPHISM;
Piece No. : PCE 1 (0-9), 2 (10-18), 3 (20-22), 4 (23-26),
5 (28-32), 6 (34-37), 7 (38-43), 8 (45-51),
9 (54-60), 10 (64-68), 11 (70-74), 12 (75-82);
Comments : PCE 1: SEVERAL PEBBLE FRAGMENTS: ONE SHOWS
BOUDINAGE AND FRACTURED CLASTS ALIGNED IN CRUDE
BEDDING;
PCE 2: POLYGENETIC CONGLOMERATE SIMILAR TO PCES
3 AND 4 IN CORE 18-1 AND PCE 1 IN CORE 19-1;
PCE 3: DARK GRAY WITH WHITE INCLUSIONS;
PCE 4: PINK PEBBLES SIMILAR TO CORE 18-1,PCES
6,7,8 AND 11 (RHYOLITE);
PCES 5 & 6: DENSE GRAYISH OLIVE GREEN (5GY 3/2)
ROUNDED COBBLES WITH PINK VEINS;
PCE 7: METACONGLOMERATE;
PCE 8: IGNIMBRITE,RHYOLITIC;
PCE 9: FINE-GRAINED,VOLCANIC ROCK,VERY DUSKY RED
(10R 2/2) WITH GREEN SPECKS;
PCES 10 & 11: PINKISH,POORLY SORTED,VOLCANIC WITH
GREEN SPECKS;
PCE 12: GRAYISH-BLUE METAGRAYWACKE(?) BIMODAL
SORTING, FELDSPAR AND QUARTZ CLASTS;
Leg : 64 Top/Bottom Interval(mm): 0/ 800 Analyst: Fornari, D.
Hole: 475 Sample Midpoint (m) : 187.30
Core: 21 Top of Core Depth (m) : 186.50
Sect: 1 Top of Section Depth(m): 186.50
LITHOLOGY: COBBLES OF VOLCANIC-METAMORPHIC-SEDIMENTARY ROCK;
Piece No. : PCE 1 (0-10), 2 (13-15), 3 (12-14), 4 (20-22),
5 (23-27), 6 (30-33), 7 (35-40), 8 (42-44),
9 (47-50), 10 (53-55), 11 (56-59), 12 (62-65),
13 (67-70), 14 (72-75), 15 (77-79);
Comments : PCE 1: 1-2MM GRAIN-SIZED SILICA-CEMENTED
GRAYWACKE, GRAINS INCLUDE QUARTZ, FELDSPAR AND
LITHIC FRAGMENTS, NARROW CALCITE BAND;
PCE 2: PURPLISH COLORED FELDSPATHIC TUFF(?) WITH
EQUAL PROPORTIONS OF CLASTS AND APHANITIC
GROUNDMASS;
PCE 3: VERY FINE-GRAINED LIGHT YELLOW (5YR 5/2)
RHYOLITE WITH ORANGE 1.0-1.5MM YELLOW PHENOCRYSTS;
PCE 4: SAME AS PCE 1;
PCE 5: VERY COARSE POLYMICTIC BRECCIA, WITH QUARTZ
(UP TO 5MM) AND LITHIC FRAGMENTS (UP TO 2CM) IN A
SILICEOUS BROWN GROUNDMASS;
PCE 6: COARSE POLYMICTIC CONGLOMERATE, LARGE
QUARTZITE PEBBLES (>0.5MM) IN SILICEOUS MATRIX;
PCE 7: 0.5-4.0 MM GRAIN-SIZED SILICA-CEMENTED
GRAYWACKE WITH QUARTZ-RICH BANDS, SOME LITHIC
FRAGMENTS;
PCE 8: ?MEDIUM-GRAINED METASEDIMENT?;
PCE 9: ?SILICEOUS VEIN MATERIAL;
PCE 10: SIMILAR TO PCE 2;
PCE 11: FINE-GRAINED DARK GRAY QUARTZITIC
SANDSTONE;
PCE 12: FINE-GRAINED GRAYWACKE (?) OR POORLY SORTED
SANDSTONE WITH FOLIATION (PROBABLY DEPOSITIONAL)
SHOWN BY BIOTITE;
PCE 13: MEDIUM-GRAINED PALE GRAY QUARTZITIC
SANDSTONE;
PCE 14: POLYMICTIC CONGLOMERATE CONTAINING 0.2-3MM
CLASTS OF QUARTZITE AND PELITES;
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