AVO Sample Information

Alaska Volcano Observatory

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SAMPLE INFO : 72-ARh-310

Sample ID:	72-ARh-310
Station ID:	72-ARh-310
Latitude:	62.0544
Longitude:	-143.47608
Datum:	NAD83
Date Sampled:	1971-01-01
Sample Type 1:	Lava
Field Lithology:	Dacite

Text Description:
Dacite cinder cone. Chiefly dense glassy scoria and blocks showing bread-crust texture. Rocks are dark gray to black and contain phenocrysts of augite, plagioclase, and minor hypersthene in a glassy matrix. Cone still retains original form. K-Ar date (M.A. Lanphere, written commun., 1974) on plagioclase indicates age of 1.34 +/- 0.20 m.y. (Sample 72-ARh-310)

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-310	62.0544	-143.47608	Richter, D. H.	1971-01-01	1340000 ± 200000 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.	Dacite cinder cone. Chiefly dense glassy scoria and blocks showing bread-crust texture. Rocks are dark gray to black and contain phenocrysts of augite, plagioclase, and minor hypersthene in a glassy matrix. Cone still retains original form. K-Ar date (M.A. Lanphere, written commun., 1974) on plagioclase indicates age of 1.34 +/- 0.20 m.y. (Sample 72-ARh-310)	72-ARh-310	Lava			Whole-rock	63.5	1.2	15.7	5.6	0.09	2	4.1	4.1	2.8	0.34	100.37	4537	RAPIDA	1.3	4.4	H2O=0.64	RAPIDA

SAMPLE LOCATION

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