Leg : 53 Top/Bottom Interval(mm): 380/ 0 Describer: Mathez, E.
Hole: 418B Top of Core Depth(m) : 320.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 321.88 Sect/Pc #: 2/PCE 3
ROCK = PLAG MODERATELY PHYRIC BASALT;
Texture: MODERATELY PORPHYRITIC,GLASSY-QUENCH;
Where sampled: NEXT TO GLASSY MARGIN,GLASSY MARGIN*
Phenocrysts- OLIVINE ( TR%)
Size(mm): 0.1-0.7 Morphology: EUHEDRAL
FRESH TO PARTIALLY ALTERED,EVEN IN GLASS;
PLAGIOCLASE ( 7%)
Size(mm): 0.3-2.2 Morphology: EUHEDRAL
FRESH,SOME GALSS INCLUSIONS*
Groundmass - COMBINATION ( 92%)
INCLUDES GLASS + CRYPTOCRYSTALLINE VARIOLITIC
GROUNDMASS,FAIRLY FRESH*
Alteration - CARBONATE
Location: VEINLETS Replacing: OL
ONLY VERY MINOR AMOUNT WITH SMEC REPLACING OL;
SMECTITE ( 10%)
Location: VESICLES Replacing: OL
PSEUDOMORPHICALLY REPLACING OL,GREEN SMEC IN
VESICLES*
Vesicles -
Percent: 1
Filling: SMEC
Shape: SQUARE
SMEC FILLING IS GREEN*
Leg : 53 Top/Bottom Interval(mm): 1030/ 0 Describer: Mathez, E.
Hole: 418B Top of Core Depth(m) : 320.00 Rock Type: IGNEOUS
Core: 35 Sample Midpoint(m) : 324.03 Sect/Pc #: 3/PCE 7
ROCK = PLAG PHYRIC BASALT;
Texture: PORPHYRITIC,QUENCH;
Where sampled: NEAR CHILLED MARGIN*
Phenocrysts- OLIVINE ( <1%)
IDENTITY UNCERTAIN FOR OL--GROUNDMASS CONTAINS
IRREGULAR PATCHES OF GREEN SMECTITE AND CALCITE
WITH OCCASIONAL PSEUDOMORPHS;
PLAGIOCLASE ( 10%)
Size(mm): 0.3-3 Morphology: EUHEDRAL
FRESH,DEVITRIFIED GLASS INCLUSIONS;
SPINEL ( TR%)
Morphology: SUBHEDRAL
ONE SUBHEDRAL GRAIN ENCLOSED IN PLAG*
Groundmass - MICROCRYST GROUNDMASS ( 89%)
INCLUDES PLAG+CPX+OP.MINS,ID UNCERTAIN FOR
OPAQUES,VARIOLITIC;
PLAGIOCLASE
Morphology: ACICULAR
CLINOPYROXENE
Morphology: DENDRITIC
Alteration - CALCITE
Location: VEINLETS, Replacing: OL,OL PHENOS
Location: GROUNDMASS
Location: PATCHES
SMECTITE
Location: VEINLETS, Replacing: OL,OL PHENOS
Location: GROUNDMASS
Location: PATCHES
GREEN SMEC REPLACING OL PHENOS*
Vesicles -
Percent: <1
Filling: SMEC,CALCITE
Shape: SQUARE
CALCITE IS MINOR*
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