Leg : 14 Top/Bottom Interval(mm): 0/ 0 Describer: Benson, W.E.
Hole: 136 Top of Core Depth(m) : 308.00 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 308.00 Sect/Pc #: 1/PCE A
ROCK = PLAG-PYX SPARSELY PHYRIC BASALT
SOURCE IS IR;
Texture: INTERGRANULAR TO SUBOPHITIC;
Groundmass - CLINOPYROXENE ( 15.1%)
PYX OF LOW BIREFR.(PIGEONITE?) IN ADDITION TO CPX
OF MODERATE BIREFR.(AUGITE),RATIO OF PIGEONITE?
TO AUGITE IS APPROX 1:4;
PLAGIOCLASE ( 32.0%)
MOST OF PLAG IS IN LONG TWINNED LATHS 0.1 TO 0.75MM
A FEW BLOCKY XTLS SHOW INTENSE ZONING, AVERAGE COMP
IS AN45 WITH EXTREMES OF AN60 AT CENTER AND AN30
AT EDGE;
OPAQUE MINERALS ( 4.3%)
ACCORDING TO GENERAL DESCRIPTION FOR THE TWO SITE 1
THIN-SECTIONS PYRITE ASSOC. WITH CALCITE IN VEINLET
AND VESICLES AND SEEMS TO BE SLIGHTLY LATER IN
ORIGIN, ALSO PRESENT AS DISSEMINATED GRAINS ESPECIA
NEAR VEINLETS,CHALCOPYRITE PRESENT IN LESSER AMOUNT
IN A FEW OF THE VEINLETS ASSOCIATED WITH PYRITE
AND CALCITE;
ALTERED GLASS ( 47.5%)
MAINLY SMECTITE,PERCENTAGES OBTAINED BY MODAL
ANALYSES,MICROCRYSTALLINE COMPLEX OF FIBROUS
"SERPENTINE" + CHLOROPHAEITE (?) + CHLORITE*
Alteration - CALCITE ( 1.1%)
ZEOLITE ( 0.1%)
SMECTITE
Replacing: GLASS
Leg : 14 Top/Bottom Interval(mm): 0/ 1 Describer: Benson, W.E.
Hole: 136 Top of Core Depth(m) : 308.00 Rock Type: IGNEOUS
Core: 9 Sample Midpoint(m) : 308.00 Sect/Pc #: 1/PCE B
ROCK = PLAG-PYX SPARSELY PHYRIC BASALT
SOURCE IS IR;
Groundmass - OLIVINE ( 0.1%)
PERCENTAGE UNCERTAIN FOR OL;
CLINOPYROXENE ( 10.4%)
PYX OF LOW BIREFR.(PIGEONITE?) IN ADDITION TO CPX
OF MODERATE BIREFR.(AUGITE).RATIO OF PIGEONITE?
TO AUGITE IS APPROX 1:9;
PLAGIOCLASE ( 24.2%)
OSCILLATORY ZONING COMMON;
OPAQUE MINERALS ( 4.8%)
ALTERED GLASS ( 60.3%)
MAINLY SMECTITE,PERCENTAGES OBTAINED BY MODAL
ANALYSES*
Alteration - CALCITE ( 1.2%)
SMECTITE
Replacing: GLASS
|
