AVO Sample Information

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SAMPLE INFO : 73ARh31

Sample ID:	73ARh31
Station ID:	73ARh31
Latitude:	62.116
Longitude:	-144.55858
Datum:	NAD83
Date Sampled:	1973-00-00
Sample Type 1:	Lava
Sample Type 2:	Dome
Field Lithology:	Rhyolite

Text Description:
Rhyolite Domes. Four conspicuously light-colored rhyolite domes (A, B, C, D) along southeast flank of Mount Drum, roughly coincident with arc of biotite-hornblende dacite domes (Qldd), appear to represent climax of activity of first cycle of Mount Drum volcanism. Domes are all deeply dissected by erosion and, with exception of dome D, expose light-colored cores cut by numerous dark-colored dacite dikes (Qdd). Rocks are light gray, pink, and buff, and weakly porphyritic with small (2 mm) phenocrysts of relatively abundant plagioclase, common to rare biotite that is generally oxidized, and very rare hornblende and resorbed quartz in a felsitic vapor-phase crystallized or spherulitic groundmass that is locally pilotaxitic.

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
73ARh31	62.116	-144.55858	Richter, D. H.	1973-00-00		Drum		Wrangell Lava, Mount Drum, Alaska	Rhyolite Domes. Four conspicuously light-colored rhyolite domes (A, B, C, D) along southeast flank of Mount Drum, roughly coincident with arc of biotite-hornblende dacite domes (Qldd), appear to represent climax of activity of first cycle of Mount Drum volcanism. Domes are all deeply dissected by erosion and, with exception of dome D, expose light-colored cores cut by numerous dark-colored dacite dikes (Qdd). Rocks are light gray, pink, and buff, and weakly porphyritic with small (2 mm) phenocrysts of relatively abundant plagioclase, common to rare biotite that is generally oxidized, and very rare hornblende and resorbed quartz in a felsitic vapor-phase crystallized or spherulitic groundmass that is locally pilotaxitic.	73ARh31	Lava			Whole-rock	74.86	0.09	14.45	0.89	0.07	0.29	1.58	4.53	2.84	0.01	99.1	55	DCP	0.98	0.89	LOI=0.39	DCP			921	346															8	48							2.2	5	1			3	3	39						55	DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn; XRF: Zr, Ni;

SAMPLE LOCATION

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