AVO Sample Information

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SAMPLE INFO : 72-ARh-307

Sample ID:	72-ARh-307
Station ID:	72-ARh-307
Latitude:	62.0114
Longitude:	-143.28308
Datum:	NAD83
Date Sampled:	1972-00-00
Sample Type 1:	Lava
Sample Type 2:	Flow

Text Description:
Dacitic andesite and dacite flows. Thick sequence of thin to medium flows with minor interbedded tuffs and breccias representing main cone-building state of Jarvis volcanoes which extend into the McCarthy D-7 and Nabesna A-6 quadrangles. Rocks are gray, dark gray, and pinkish gray. Chiefly two-pyroxene andesite containing hypersthene, augite, plagioclase, and rare olivine phenocrysts in a felty plagioclase-rich matrix. In southwest corner of quadrangle sequence is cut by numerous dark-colored dikes probably chiefly of andesite composition. K-Ar date (M.A. Lanphere, written commun., 1974) on plagioclase indicates age of 1.63 +/- 0.42 m.y. (Sample 72-ARh-307a).

References:

Geologic map of the Nabesna A-5 quadrangle, 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
72-ARh-307	62.0114	-143.28308	Richter, D. H.	1972-00-00	1630000 ± 420000 K-Ar; 4537; plagioclase K-Ar	Jarvis		Nabesna A-5 quadrangle; Wrangell Lava; Wrangell Volcanic Field. lat long points derived from paper map. Sample from Jarvis.	Dacitic andesite and dacite flows. Thick sequence of thin to medium flows with minor interbedded tuffs and breccias representing main cone-building state of Jarvis volcanoes which extend into the McCarthy D-7 and Nabesna A-6 quadrangles. Rocks are gray, dark gray, and pinkish gray. Chiefly two-pyroxene andesite containing hypersthene, augite, plagioclase, and rare olivine phenocrysts in a felty plagioclase-rich matrix. In southwest corner of quadrangle sequence is cut by numerous dark-colored dikes probably chiefly of andesite composition. K-Ar date (M.A. Lanphere, written commun., 1974) on plagioclase indicates age of 1.63 +/- 0.42 m.y. (Sample 72-ARh-307a).	72-ARh-307	Lava			Whole-rock	61.9	1.1	16.6	5.3	0.09	2.5	4.8	4.4	2.2	0.28	99.98	4537	RAPIDA	2.3	3.2	H2O=0.71	RAPIDA

SAMPLE LOCATION

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