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SAMPLE INFO : Barth_1956_8

Sample ID:	Barth_1956_8
Station ID:	Barth_1956_8
Latitude:	57.18
Longitude:	-170.3
Datum:	NAD83
Date Sampled:	1948-01-01
Sample Type 1:	Lava
Sample Type 2:	Flow

Text Description:
Sample of a dense flow of chrystophyric hyalobasanite, cropping out over a distance of several miles along the west shore (and under Einahnuhto Bluffs) of St. Paul Island. The rock is gray with finely crystalline groundmass studded with clear, yellow phenocrysts of olivine from 1 mm to 10 mm across, some zoned; refractive index and 2V angle correspond to about Fa20. Very few phenocrysts are clinopyroxene; they are always zoned and usually pitted and intergrown with minerals of the groundmass. Refractive index and 2V angle correspond to He40. The glassy groundmass includes small grains of olivine and pyroxene. Small plagioclase laths form a mesh; indices of refraction lie in the range 1.555-1.565, indicating about An55. The glass shows incipient crystallization, index, n=1.53-1.54.

References:

Geology and petrology of the Pribilof Islands, 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
Barth_1956_8	57.18	-170.3	Barth, T. F. W.	1948-01-01		St. Paul Island		West shore of St. Paul Island	Sample of a dense flow of chrystophyric hyalobasanite, cropping out over a distance of several miles along the west shore (and under Einahnuhto Bluffs) of St. Paul Island. The rock is gray with finely crystalline groundmass studded with clear, yellow phenocrysts of olivine from 1 mm to 10 mm across, some zoned; refractive index and 2V angle correspond to about Fa20. Very few phenocrysts are clinopyroxene; they are always zoned and usually pitted and intergrown with minerals of the groundmass. Refractive index and 2V angle correspond to He40. The glassy groundmass includes small grains of olivine and pyroxene. Small plagioclase laths form a mesh; indices of refraction lie in the range 1.555-1.565, indicating about An55. The glass shows incipient crystallization, index, n=1.53-1.54.	Barth_1956_8	Lava			Whole-rock	44.41	2.19	12.75	11.36	0.18	14.72	9.3	3	1.41	0.71	100.14	301	NN	2.15	9.42	H2OM=0.05; H2OP=0.2	NN

SAMPLE LOCATION

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