Leg : 38 Top/Bottom Interval(mm): 0/ 900 Analyst: White, S.M.
Hole: 336 Sample Midpoint (m) : 476.40
Core: 39 Top of Core Depth (m) : 472.50
Sect: 3 Top of Section Depth(m): 475.50
LITHOLOGY: SEDIMENT CLASTS;
Comments : POSSIBLE CONTACT TO LOWER BRECCIA IN 63-90CM;
Leg : 38 Top/Bottom Interval(mm): 900/1450 Analyst: White, S.M.
Hole: 336 Sample Midpoint (m) : 476.95
Core: 39 Top of Core Depth (m) : 472.50
Sect: 3 Top of Section Depth(m): 476.40
LITHOLOGY: BASALTIC BRECCIA;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : COMPOSED OF CLASTS AND BRECCIA, SUBROUNDED TO WELL
ROUNDED, 0.5-0.7 SPHERICITY, CLAST SIZE 1-40MM;
Alteration : ALTERED BASALT;
Comments : CLASTS ARE BLACKISH RED (5R 2/2), MATRIX IS MODERATE
YELLOW-BROWN (10YR 6/2);
Leg : 38 Top/Bottom Interval(mm): 0/1500 Analyst: White, S.M.
Hole: 336 Sample Midpoint (m) : 478.50
Core: 39 Top of Core Depth (m) : 472.50
Sect: 4 Top of Section Depth(m): 477.00
LITHOLOGY: BASALTIC BRECCIA;
SEDIMENT (CLAY);
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : COMPOSED OF SUBROUNDED ALTERED CLAY CLASTS, CLAST
SIZE 1-40MM, SOME EVIDENCE OF UPWARD DECREASE IN
GRAIN SIZE;
Alteration : MINERALIZATION OF MATRIX? CUTS AND REPLACES
GRAINS;
Comments : CLASTS ARE DUSKY RED (5R 3/4), MATRIX IS VERY LIGHT
GRAY (N5) WITH SOME DARK YELLOW-ORANGE (10YR 6/6)
ABOVE 50CM TO LIGHT BLUISH GRAY (5B 7/1) BELOW 50CM,
ID UNCERTAIN OF CLASTS DUE TO UNCLEAR VISUAL
DESCRIPTION FORM;
Replacement: CLAY
CLASTS ALTERED TO CLAY;
Leg : 38 Top/Bottom Interval(mm): 350/ 900 Analyst: White, S.M.
Hole: 336 Sample Midpoint (m) : 482.90
Core: 40 Top of Core Depth (m) : 482.00
Sect: 1 Top of Section Depth(m): 482.35
LITHOLOGY: BASALT;
SEDIMENT (CLAY);
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : COARSE-GRAINED, MIXTURE OF BASALT & CLAY FRAGMENTS,
FINER-GRAINED THAN INTERVAL 90-150CM, CONTAINS
INCOHERENT SAND & ANGULAR CLASTS & MEDIUM TO COARSE
SAND-SIZED MATERIAL IN A COARSE CLAYEY MATRIX,
PROBABLE BIMODAL SIZE DISTRIBUTION, SOME CLASTS OF
WHITISH MINERALIZED? OR ALTERED CLAY-SIZED MATERIAL;
Comments : DARK & MODERATE REDDISH BROWN COLOR, ENTIRE SECTION
PROBABLY NOT IN PLACE BUT LOOSE FRAGMENTS SORTED
INTO SIZE DURING DRILLING;
Leg : 38 Top/Bottom Interval(mm): 900/1250 Analyst: White, S.M.
Hole: 336 Sample Midpoint (m) : 483.25
Core: 40 Top of Core Depth (m) : 482.00
Sect: 1 Top of Section Depth(m): 482.90
LITHOLOGY: BASALT;
SEDIMENT (CLAY);
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : COARSE-GRAINED, BASALTIC & CLAY FRAGMENTS, LOOSE
GRANULAR, FRAGMENT DIAMETER 0.5-1CM, UPWARD DECREASE
IN CLAST SIZE WITH GRADATION INTO OVERLYING SILT AND
SAND;
Comments : DARK & MODERATE REDDISH BROWN COLOR;
Leg : 38 Top/Bottom Interval(mm): 1250/1500 Analyst: White, S.M.
Hole: 336 Sample Midpoint (m) : 483.50
Core: 40 Top of Core Depth (m) : 482.00
Sect: 1 Top of Section Depth(m): 483.25
LITHOLOGY: BASALTIC BRECCIA;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : SUBROUNDED TO ANGULAR CLASTS, SOFT BUT GENERALLY
HARDER THAN CORE 39, CLAST DIAMETER 1-2CM;
Alteration : CLASTS SHOW EVIDENCE OF MINERALIZATION;
Comments : GREENISH BLACK & DUSKY RED COLOR, SAME BRECCIA AS
CORE 39;
Leg : 38 Top/Bottom Interval(mm): 0/1500 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 486.00
Core: 41 Top of Core Depth (m) : 484.50
Sect: 1 Top of Section Depth(m): 484.50
LITHOLOGY: APHYRIC DOLERITE;
MASSIVE;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : APHYRIC, FINE-GRAINED, CRYSTALLINED, GLASS SIDINGS,
DOLERITE IS OF SUBALKALI TYPE (TRACHYDOLERITE);
Structure : MASSIVE, THIN VEINS OF BLACK CHLORITE & RARE CALCITE
& PYRITE, THIN FISSURES;
Alteration : FRESH;
Comments : BLACK (N1) TO DARK GRAY (N3) COLOR;
Replacement: CALCITE
IN VEINS;
CHLORITE
RARE, IN VEINS;
PYRITE
IN VEINS;
Leg : 38 Top/Bottom Interval(mm): 250/1500 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 488.00
Core: 42 Top of Core Depth (m) : 486.50
Sect: 1 Top of Section Depth(m): 486.75
LITHOLOGY: DOLERITE;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : FINE-GRAINED, HOLOCRYSTALLINE, INTERVALS 34-36 &
70-72 & 117-121 & 139-143CM ARE BRECCIATED;
Structure : CALCITE AND CHLORITE VEINS;
Alteration : WEATHERED AT 25-32CM;
Comments : VERY DARK RED (5R 2/6) AT 25-32CM, INTERVAL 32-150CM
IS THE SAME AS CORE 41-1;
Replacement: CALCITE
IN VEINS;
CHLORITE
IN VEINS;
Leg : 38 Top/Bottom Interval(mm): 0/1500 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 489.50
Core: 42 Top of Core Depth (m) : 486.50
Sect: 2 Top of Section Depth(m): 488.00
LITHOLOGY: DOLERITE;
SAME LITHOLOGY AS SEC 1;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : FINE-GRAINED, HOLOCRYSTALLINE;
Structure : CALCITE AND CHLORITE AND PYRITE VEINS;
Replacement: CALCITE
IN VEINS;
CHLORITE
IN VEINS;
PYRITE
IN VEINS;
Leg : 38 Top/Bottom Interval(mm): 250/1500 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 497.50
Core: 43 Top of Core Depth (m) : 496.00
Sect: 1 Top of Section Depth(m): 496.25
LITHOLOGY: DOLERITE;
SAME LITHOLOGY AS CORE 42;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : FINE-GRAINED, HOLOCRYSTALLINE, INTERVAL 135-150CM IS
BRECCIATED;
Structure : CALCITE AND CHLORITE VEINS;
Vesicles : EMPTY VUGS IN 135-150CM;
Replacement: CALCITE
CHLORITE
Leg : 38 Top/Bottom Interval(mm): 870/ 940 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 506.44
Core: 44 Top of Core Depth (m) : 505.50
Sect: 1 Top of Section Depth(m): 506.37
LITHOLOGY: SEDIMENT (CLAYSTONE);
DRILL BRECCIA;
Piece No. : PCE 1 (87-89), 2 (89-91), 3 (91-94);
Comments : 30-DEGREE CONTACT BETWEEN PCES 3&4, MYLONITIZATION
PRESENT;
Leg : 38 Top/Bottom Interval(mm): 940/1440 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 506.94
Core: 44 Top of Core Depth (m) : 505.50
Sect: 1 Top of Section Depth(m): 506.44
LITHOLOGY: TRACHYBASALT;
TRACHYDOLERITE;
Piece No. : PCE 4 (91-144);
Texture : POROUS;
Comments : COLOR IS BLACK (N1);
Vesicles :
Location: Filling: CALCITE, CHLORITE
VUGS EMPTY OR FILLED WITH CALCITE & CHLORITE;
Groundmass : PLAGIOCLASE ( 50%)
PYROXENE ( 40%)
BIOTITE ( 5%)
MAGNETITE ( 5%)
Replacement: CALCITE
IN VUGS;
CHLORITE
IN VUGS, CHLORITIZATION OF GROUNDMASS;
Leg : 38 Top/Bottom Interval(mm): 1440/1500 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 507.00
Core: 44 Top of Core Depth (m) : 505.50
Sect: 1 Top of Section Depth(m): 506.94
LITHOLOGY: BASALTIC MYLONITE;
Piece No. : PCE 5 (144-150);
Comments : GRAYISH OLIVE (10Y 4/2) TO DARK GRAY (N3);
Leg : 38 Top/Bottom Interval(mm): 0/ 130 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 507.13
Core: 44 Top of Core Depth (m) : 505.50
Sect: 2 Top of Section Depth(m): 507.00
LITHOLOGY: BASALTIC MYLONITE;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Comments : COLOR IS OLIVE GREEN (5GY 5/2);
Replacement: CHLORITE
Leg : 38 Top/Bottom Interval(mm): 130/1500 Analyst: Kharin, G.
Hole: 336 Sample Midpoint (m) : 508.50
Core: 44 Top of Core Depth (m) : 505.50
Sect: 2 Top of Section Depth(m): 507.13
LITHOLOGY: APHYRIC TRACHYBASALT;
TRACHYDOLERITE;
Piece No. : PCE NO PIECE NUMBERS ASSIGNED;
Texture : APHYRIC, POROUS, SUBOPHITIC, FINE-GRAINED;
Structure : CONTAINS RARE CHLORITE AND CALCITE VEINS;
Alteration : WEATHERED;
Comments : BLACK (N1) TO DARK GRAY (N3);
Vesicles :
Location: ABUNDANT Filling: CHLORITE, ZEOLITE
CHLORITE IN AMYGDULES & VESICLES, ZEOLITE IN
AMYGDULES;
Groundmass : PLAGIOCLASE ( 50%)
Size(mm): 0.2-0.4
CLINOPYROXENE ( 40%)
BIOTITE ( 3-5%)
MAGNETITE ( 3-5%)
GROUNDMASS FROM THIN SECTIONS AT 58-60 & 71-74CM;
Replacement: CALCITE
CHLORITE
CHLORITE IS BLACK-GREEN;
ZEOLITE
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