THIN SECTION:	"U1301B-15R-1, 81-82 cm (Piece 11)"				TS #	26	Unit:4A	OBSERVER: 
ROCK NAME: 	Moderately olivine-clinopyroxene-plagioclase phyric basalt							
WHERE SAMPLED:	Massive flow							
GRAIN SIZE:	Cryptocrystalline							
TEXTURE:	"Intersertal, glomeroporphyritic"							
PRIMARY	PERCENT 	PERCENT	SIZE (mm)			APPROX.		
MINERALOGY	PRESENT 	ORIGINAL	min.	max.	av.	COMP.	MORPHOLOGY	COMMENTS
PHENOCRYSTS								
Plagioclase	7	7	0.8	2.2	1.2		Euhedral to skeletal	"Occurs as individual crystals and as monomineralic, and bimineralic glomeroporphyritic clots with clinopyroxene. Some glass inclusions present. "
Clinopyroxene	3	3	0.5	1.2	0.5		Euhedral to anhedral	Present in glomeroporphyritic clots associated with plagioclase laths.
Olivine	0	2	0.5	1	0.5		Euhedral to subhedral	Completely replaced by saponite + celadonite + Feox.

GROUNDMASS								
Plagioclase	35	35		<0.8			Euhedral	
Clinopyroxene	20	20		<0.5			Euhedral to anhedral	
Olivine	0	7		<0.5			Subhedral	
Mesostasis	30	26						Includes opaque minerals.

SECONDARY			SIZE (mm)					
MINERALOGY	PERCENT		min.	max.	av.		REPLACING / FILLING	COMMENTS
Saponite	7						"Olivine, mesostasis, vesicles, vein"	Fibrous to granular brown-green saponite.
Feox + hematite	3						"Olivine, mesostasis, vesicles, vein"	
Celadonite	1						"Olivine, mesostasis, vesicles, vein"	
Pyrite	Tr						Mesostasis	

VESICLES/			SIZE (mm)					
CAVITIES	PERCENT	 LOCATION	min.	max.	av.		FILLING / MORPHOLOGY	COMMENTS
Vesicles	2	Even	0.1	1	0.5		"saponite, celadonite, Feox"	



COMMENTS : 	"8 mm vein, which consists of Feox / hematite + green saponite + celadonite. Thick alteration halo (1 cm) developed along vein. "