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SAMPLE INFO : Snyder_1959_8

Sample ID:	Snyder_1959_8
Station ID:	Snyder_1959_8
Latitude:	51.9531
Longitude:	178.5356
Datum:	NAD83
Sample Type 1:	Lava
Field Lithology:	Dacite

Text Description:
Low-silica dacite of Little Sitkin dacite. Color: dark gray (N 3). Texture: hypocrystalline, porphyritic with prominent feldspar phenocrysts as much as 6 mm long. Plagioclase, 20-25 percent, ranges from An36 to An62 in individual zoned phenocrysts and between different crystals; average composition is about An50; graphic fritting texture and two-fluid inclusions present in centers or selected zones of some feldspar crystals. Clinopyroxene, 6 percent, appears as reaction rims on some orthopyroxene, 5 percent, and olivine, 1 percent. Accessory: magnetite, 1-2 percent. Groundmass is clear brown glass choked with plagioclase (average composition, An43) and acicular orthopyroxene(?) microlites. Index of refraction of an artificial glass of the powdered rock is greater than 1.540.

References:

Geology of Little Sitkin Island, Alaska

GEOCHEM DATA

StationID	Latitude	Longitude	Geologist	DateVisited	Age Info	Volcano	Eruption	Location Description	Text Description	Sample ID	Sample Type 1	Sample Type 2	Final Unit	Material	SiO2	TiO2	Al2O3	FeOT	MnO	MgO	CaO	Na2O	K2O	P2O5	Total-majors	REF majors	METH majors	Fe2O3/Fe203T orig	FeO/FeOT orig	Volatiles csv	METH volatiles	Cs	Rb	Ba	Sr	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Y	Zr	Nb	Hf	Ta	Pb	Th	U	Sc	V	Cr	Fe	Co	Ni	Cu	Zn	Ga	Mo	As	Na	K	Ref trace1	METH trace1	Rb	Ba	Sr	La	Ce	Nd	Sm	Eu	Gd	Dy	Er	Yb	Lu	Y	Zr	Nb	Pb	Th	U	Sc	Ti	V	Cr	Ni	Cu	Zn	Ga	Ref trace2	METH trace2	Light csv	Halogen csv	other major csv	other lile csv	other ree csv	other hfse csv	other hpe csv	other tm csv	other misc csv
Snyder_1959_8	51.9531	178.5356	Snyder, G. L.			Little Sitkin		Little Sitkin dacite from crater flow of West Cove member 1 mile south of crater lake	Low-silica dacite of Little Sitkin dacite. Color: dark gray (N 3). Texture: hypocrystalline, porphyritic with prominent feldspar phenocrysts as much as 6 mm long. Plagioclase, 20-25 percent, ranges from An36 to An62 in individual zoned phenocrysts and between different crystals; average composition is about An50; graphic fritting texture and two-fluid inclusions present in centers or selected zones of some feldspar crystals. Clinopyroxene, 6 percent, appears as reaction rims on some orthopyroxene, 5 percent, and olivine, 1 percent. Accessory: magnetite, 1-2 percent. Groundmass is clear brown glass choked with plagioclase (average composition, An43) and acicular orthopyroxene(?) microlites. Index of refraction of an artificial glass of the powdered rock is greater than 1.540.	Snyder_1959_8	Lava			Whole-rock	60.11	0.77	16.84	6.81	0.15	3.08	6.91	3.5	1.46	0.15	99.95	424	NN	2.25	4.77	H2OM=0.05; H2OP=0.17; CO2=0	NN		28.3		280																												7.1							units are percent 1.21	745	XRF: Rb, Sr, Ni; NN: K;

SAMPLE LOCATION

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