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SAMPLE INFO : 73-ARh-86

Sample ID:	73-ARh-86
Station ID:	73-ARh-86
Latitude:	62.3377
Longitude:	-143.78998
Datum:	NAD83
Date Sampled:	1973-00-00
Sample Type 1:	Tephra Fall
Sample Type 2:	Bomb
Field Lithology:	Basalt

Text Description:
Wrangell Lava. Basalt tuff cone (Holocene or Pleistocene). Grayish brown to yellowish-brown, bedded and locally palagonitic ash plus variable amounts of pumice, cinder and glassy bombs as much as 1 m in diameter. Thin beds of accretionary lapilli common locally. All ejecta are of olivine basalt composition. Dark-gray bombs contain phenocrysts of plagioclase (4-5 %, 0.5 mm) and fresh olivine (2-3%, 2-3 mm) in a glassy groundmass. Major element chemistry for sample 73-ARh-86 (map locality 1), a glassy bomb, is shown in table 1. Cone has been partly eroded by Copper River but has not been overridden by active glacial ice. Apparently erupted either through or ice during waning (stagnant) state of Wisconsin glaciation or through water or water-saturated sediments following Wisconsin glaciation.

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
73-ARh-86	62.3377	-143.78998	Richter, D. H.	1973-00-00				Wrangell Lava; Nabesna B-6 quadrangle. Latitude and longitude derived from paper map.	Wrangell Lava. Basalt tuff cone (Holocene or Pleistocene). Grayish brown to yellowish-brown, bedded and locally palagonitic ash plus variable amounts of pumice, cinder and glassy bombs as much as 1 m in diameter. Thin beds of accretionary lapilli common locally. All ejecta are of olivine basalt composition. Dark-gray bombs contain phenocrysts of plagioclase (4-5 %, 0.5 mm) and fresh olivine (2-3%, 2-3 mm) in a glassy groundmass. Major element chemistry for sample 73-ARh-86 (map locality 1), a glassy bomb, is shown in table 1. Cone has been partly eroded by Copper River but has not been overridden by active glacial ice. Apparently erupted either through or ice during waning (stagnant) state of Wisconsin glaciation or through water or water-saturated sediments following Wisconsin glaciation.	73-ARh-86	Tephra Fall	Cumulate		Whole-rock	54.4	0.98	16.5	7.26	0.13	7.48	7.91	3.51	0.99	0.21	100.56	2321	NN	1.88	5.6	H2OP=0.52; H2OM=0.06; CO2=0.02	RAPIDA

SAMPLE LOCATION

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