AVO Sample Information

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SAMPLE INFO : 81-ARh-26

Sample ID:	81-ARh-26
Station ID:	81-ARh-26
Latitude:	62.3502
Longitude:	-143.75048
Datum:	NAD83
Date Sampled:	1981-00-00
Sample Type 1:	Lava
Sample Type 2:	Flow
Field Lithology:	Dacite

Text Description:
Wrangell Lava. Crystal-rich dacite flow. Light gray, locally streaked reddish-gray, massive to flow-laminated, moderately crystal rich dacite containing phenocrysts of sodic plagioclase (5-10%, 2-5 mm) that are locally resorbed, biotite (1-3%, 1-3 mm), rounded quartz (trace to 1%, 2 mm), and traces of opaque minerals in a microtrachytic groundmass. Possibly late flow from rhyolite dome (unit Qrd). K-Ar age of biotite from sample 81-ASj-72 (map locality 20) is 1.74 +/- 0.11 Ma.

References:

Geologic map of the Nabesna B-6 Quadrangle, south-central 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
81-ARh-26	62.3502	-143.75048	Richter, D. H.	1981-00-00				Wrangell Lava; Nabesna B-6 quadrangle. Latitude and longitude derived from paper map.	Wrangell Lava. Crystal-rich dacite flow. Light gray, locally streaked reddish-gray, massive to flow-laminated, moderately crystal rich dacite containing phenocrysts of sodic plagioclase (5-10%, 2-5 mm) that are locally resorbed, biotite (1-3%, 1-3 mm), rounded quartz (trace to 1%, 2 mm), and traces of opaque minerals in a microtrachytic groundmass. Possibly late flow from rhyolite dome (unit Qrd). K-Ar age of biotite from sample 81-ASj-72 (map locality 20) is 1.74 +/- 0.11 Ma.	81-ARh-26	Lava			Whole-rock	66	0.58	15.4	3.3	0.06	2.11	3.76	3.39	3.75	0.21	99.31	2321	NN	1.63	1.8	H2OP=1.3; H2OM=0.13; CO2=0.01	RAPIDA

SAMPLE LOCATION

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