Leg : 13 Top/Bottom Interval(mm): 0/ 0 Describer: Hsu, K.
Hole: 122 Top of Core Depth(m) : 160.20 Rock Type: IGNEOUS
Core: B 1 Sample Midpoint(m) : 160.20 Sect/Pc #: /
ROCK = PLAG PHYRIC BASALT
SOURCE IS IR,VESICULAR BASALT,DRILL BIT SAMPLE 1;
Texture: VESICULAR,GLASSY;
Where sampled: DRILL BIT*
Phenocrysts- PLAGIOCLASE ( 10%)
Size(mm): .1-.3 Morphology: LATHS
SUBPARALLEL ORIENTATION OF LATHS GIVES ROCK A FLOW
STRUCTURE*
Groundmass - OPAQUE MINERALS
SCATTERED IN THE MATRIX ARE A FEW GRAINS OF OPAQUE
IRON MINERALS AND HEMATITE;
OTHER
"WITHIN THE BASALT IS A TUFFACEOUS SEDIMENT.THE
PYROCLASTIC GRAINS INCLUDE PYX,PLAG AND TINY
BASALT FRAGMENTS,GRAINS OF SEDIMENTARY ORIGIN ARE
ALSO PRESENT,THESE GRAINS ARE MAINLY PELAGIC OOZES
AND FORAMINIFERAL TESTS ARE CLEARLY RECOGNIZABLE
IN THEM,THE TUFFACEOUS MATRIX IS ALTERED TO A VERY
FINE GRAINED ZEOLITIC AGGREGATE,THE TUFF IS ONLY
0.6MM THICK AND IS BOUNDED SHARPLY BY BASALT.THE
CONTACTS ARE INCLINED TO THE FLOW BANDING OF THE
BASALT,SUCH A CONTACT RELATION SUGGESTS THAT THE
TUFF MAY HAVE BEEN SQUEEZED INTO THE CRACKS OF THE
BASALT,ALTERNATIVELY,THE BASALT COULD HAVE BEEN
CLASTS IN A TUFFACEOUS BRECCIA(THE TUFF BEING THE
MATRIX OF THE BRECCIA)FOR WE OBSERVE ANOTHER
TUFFACEOUS SEDIMENT AT ANOTHER CORNER OF THE
SECTION FRINGING THE BASALT,THERE THE CONTACT IS
MORE OR LESS PARALLEL TO FLOW-BANDING OF THE
BASALT."*
Alteration - CARBONATE
Location: VESICLES
ZEOLITE
Location: VESICLES
CHLORITE
Location: VESICLES
CLINOZOISITE
Location: VESICLES
Vesicles -
Size(mm): TO 1
Percent: 25
Filling: CARBONATES +
Shape: FLATTENED
Filling: ZEOLITES
VESICLES ARE IN PART PARALLEL TO FLOW BANDING,
INSIDES OF VESICULAR CAVITIES ARE LINED WITH
CRYPTOXTLLINE AGGREGATES WHICH INCLUDE CHLORITE +
CLINOZOISITE,SOME LARGE VESICLES HAVE BEEN
CONVERTED INTO AMYGDULES*
Leg : 13 Top/Bottom Interval(mm): 0/ 0 Describer: Hsu, K.
Hole: 122 Top of Core Depth(m) : 162.00 Rock Type: TUFF
Core: B 2 Sample Midpoint(m) : 162.00 Sect/Pc #: /
ROCK = ANDESITIC OR BASALTIC TUFF
SOURCE IS IR,DRILL BIT SAMPLE 2;
Texture: GLASSY TUFFACEOUS*
Groundmass - PLAGIOCLASE
Size(mm): .1-2 Morphology: NEARLY EQUANT OR SLIGHTLY
Morphology: ELONGATED
CONSTITUTE BULK OF XTL FRAGMENTS,SOME SHOW SIGNS
OF HAVING BEEN SHATTERED,A FEW BASALT FRAGMENTS
ARE PRESENT(BLOCK)-THEY CONSIST OF LATH-SHAPED
PLAG XTLS IN A DARK GLASSY MATRIX,THE XTL AND
LITHIC FRAGMENTS CONSTITUTE ABOUT 50% OF BULK
VOLUME,THE OTHER HALF IS A GLASSY TUFFACEOUS
MATRIX WHICH INCLUDES SCATTERED GRAINS OF OPAQUE
IRON MINERALS*
Leg : 13 Top/Bottom Interval(mm): 0/ 0 Describer: Hsu, K.
Hole: 122 Top of Core Depth(m) : 162.10 Rock Type: IGNEOUS
Core: B 3 Sample Midpoint(m) : 162.10 Sect/Pc #: /
ROCK = BASALT
SOURCE IS IR,DRILL BIT SAMPLE 3;
Texture: APHANITIC*
Phenocrysts- PLAGIOCLASE
Size(mm): TO .5 Morphology: LATH-SHAPED
A FEW LARGER,ZONED AND MORE NEARLY EQUANT PLAG
GRAINS ARE ALSO PRESENT,THE LATHS SHOW SOME
PREFERRED ORIENTATION*
MATRIX IS GLASSY AND DARK BROWN IN COLOR*
Vesicles -
Percent: 5
A FEW SMALL VESICLES*
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