AVO Sample Information

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SAMPLE INFO : 74ARh311

Sample ID:	74ARh311
Station ID:	74ARh311
Latitude:	62.065
Longitude:	-144.75548
Datum:	NAD83
Date Sampled:	1974-00-00
Sample Type 1:	Lava
Sample Type 2:	Flow
Field Lithology:	Dacite

Text Description:
Dacite flows of Snider Peak - Massive dark gray weathering hornblende-rich flows that radiate from general area of Snider Peak dome. Flows are as much as a 100 m thick but appear to consist of complex multiple-flow cooling units suggesting possibility of more than one source, perhaps in part including second-cycle cone-building flows. They locally contain abundant concentrations of xenoliths and exhibit conspicuous columnar jointing. Rocks are light gray to pinkish medium gray with abundant medium (2-5 mm) phenocrysts of plagioclase and brown hornblende, minor to common hypersthene, and rare biotite, resorbed augite, and olivine generally in a feldspar-rich pilotaxitic to trachytic groundmass. Glassy phases have hyalopilitic and locally spherulitic groundmass textures. Chemistry: samples 23 (74-AMm-76B), 26 (74-ARh-310)

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
74ARh311	62.065	-144.75548	Richter, D. H.	1974-00-00		Drum		Wrangell Lava, Mount Drum, Alaska	Dacite flows of Snider Peak - Massive dark gray weathering hornblende-rich flows that radiate from general area of Snider Peak dome. Flows are as much as a 100 m thick but appear to consist of complex multiple-flow cooling units suggesting possibility of more than one source, perhaps in part including second-cycle cone-building flows. They locally contain abundant concentrations of xenoliths and exhibit conspicuous columnar jointing. Rocks are light gray to pinkish medium gray with abundant medium (2-5 mm) phenocrysts of plagioclase and brown hornblende, minor to common hypersthene, and rare biotite, resorbed augite, and olivine generally in a feldspar-rich pilotaxitic to trachytic groundmass. Glassy phases have hyalopilitic and locally spherulitic groundmass textures. Chemistry: samples 23 (74-AMm-76B), 26 (74-ARh-310)	74ARh311	Lava			Whole-rock	63.45	0.62	17.1	4.3	0.09	2.93	5.25	4.33	1.8	0.18	100.65	55	DCP	4.8	4.3	LOI=-0.02	DCP			616	592															12	100							11.2	115	49			44	38	60						55	DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn; XRF: Zr, Ni;

SAMPLE LOCATION

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