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SAMPLE INFO : Barth_1956_14

Sample ID:	Barth_1956_14
Station ID:	Barth_1956_14
Latitude:	56.58
Longitude:	-169.63
Datum:	NAD83
Date Sampled:	1948-01-01
Sample Type 1:	Lava
Sample Type 2:	Sill

Text Description:
Sample of an apophysis of limburgite from a layer of semicrystalline, porphyritic hyalobasanite about 3 feet thick. It may be a flow, but is likely a sill. In the apophyses the rock becomes very dense and black, but still remains slightly porphyritic. Thin sections reveal that it corresponds to limburgite containing olivine, augite, and magnetite, but practically no feldspar, as primary phases. Olivine is often distinctly zoned. Augite is reddish in color, shows hourglass structure and is highly zoned. Positive 2V is around 60 degrees with strong dispersion r>v; the directions of the extinctions are also highly dispersed, ??c=45 degrees. It is a titaniferous augite. Zeolites are seen in cavities.

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_14	56.58	-169.63	Barth, T. F. W.	1948-01-01		St. George volcanic field		On the seashore, 1 mile south of Garden Cove, St. George Island	Sample of an apophysis of limburgite from a layer of semicrystalline, porphyritic hyalobasanite about 3 feet thick. It may be a flow, but is likely a sill. In the apophyses the rock becomes very dense and black, but still remains slightly porphyritic. Thin sections reveal that it corresponds to limburgite containing olivine, augite, and magnetite, but practically no feldspar, as primary phases. Olivine is often distinctly zoned. Augite is reddish in color, shows hourglass structure and is highly zoned. Positive 2V is around 60 degrees with strong dispersion r>v; the directions of the extinctions are also highly dispersed, ??c=45 degrees. It is a titaniferous augite. Zeolites are seen in cavities.	Barth_1956_14	Lava			Whole-rock	40.4	3.25	13.16	12.44	0.2	11.26	10.34	3.4	0.8	0.86	100.4	301	NN	5.34	7.62	H2OM=2.24; H2OP=1.68	NN

SAMPLE LOCATION

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