AVO Sample Information

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SAMPLE INFO : 73ARh18

Sample ID:	73ARh18
Station ID:	73ARh18
Latitude:	62.1471
Longitude:	-144.60938
Datum:	NAD83
Date Sampled:	1973-00-00
Sample Type 1:	Lava
Sample Type 2:	Flow
Field Lithology:	Dacite

Text Description:
Thick lobate flows of dacite and minor rhyodacite that form massive piles along west, northwest, north, and northeast flanks of Mount Drum, apparently erupted from central vent. Rocks are light to pinkish medium gray, weather dark reddish brown, and are porphyritic with phenocrysts (1-3 mm) of plagioclase, hypersthene, hornblende, and rare to minor biotite and augite in a pilotaxitic to trachyitic groundmass. Probably related in age to late hornblende-biotite dacite domes (Qldd).

References:

Geochemical variation in the less than 5 Ma Wrangell Volcanic Field, Alaska, with an emphasis on the Skookum Creek volcanic complex

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
73ARh18	62.1471	-144.60938	Richter, D. H.	1973-00-00		Drum		Wrangell Lava, Mount Drum, Alaska	Thick lobate flows of dacite and minor rhyodacite that form massive piles along west, northwest, north, and northeast flanks of Mount Drum, apparently erupted from central vent. Rocks are light to pinkish medium gray, weather dark reddish brown, and are porphyritic with phenocrysts (1-3 mm) of plagioclase, hypersthene, hornblende, and rare to minor biotite and augite in a pilotaxitic to trachyitic groundmass. Probably related in age to late hornblende-biotite dacite domes (Qldd).	73ARh18	Lava			Whole-rock	64.31	0.41	17.5	3.56	0.07	2.37	4.99	4.45	1.63	0.09	100.4	55	DCP	3.96	3.56	LOI=0.62	DCP			569	693															8	85							9.7	88	34			34	30	52						55	DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn; XRF: Zr, Ni;

SAMPLE LOCATION

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