AVO Sample Information

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SAMPLE INFO : 79AWs 17

Sample ID:	79AWs 17
Station ID:	79AWs 17
Latitude:	57.26
Longitude:	-156.82540177362
Datum:	NAD83
Date Sampled:	1979-01-01
Sample Type 1:	Lava
Field Lithology:	Dacite

Text Description:
Medium-light gray (N 6), porphyritic dacite (S; high-silica andesite G). Major phases are clinopyroxene, orthopyroxene (hypersthene), plagioclase (An 58 and possibly An 40), and glass. Phenocrysts of plagioclase and pyroxene as much as 7 mm in length in a very fine grained to aphanitic groundmass of plagioclase, glass, and opaque minerals. In thin section, areas of the groundmass are more transparent than others; these more transparent areas contain fewer opaque minerals and are located in areas of augite concentration. Sample contains two types of plagioclase phenocrysts; some are poikilitic and have overgrown edges, and others are unaltered, free of inclusions, and may have resorbed edges. Most plagioclase phenocrysts of both types have compositions between An 60 to 70, although some may have compositions nearer to An 40.

References:

Map and tables showing geochronology and whole-rock geochemistry of selected samples, Ugashik and part of Karluk quadrangles, 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
79AWs 17	57.26	-156.82540177362	Wilson, F. H.	1979-01-01		Kialagvik		Ugashik B-3, northwest of Kialagvik near VABM Gob	Medium-light gray (N 6), porphyritic dacite (S; high-silica andesite G). Major phases are clinopyroxene, orthopyroxene (hypersthene), plagioclase (An 58 and possibly An 40), and glass. Phenocrysts of plagioclase and pyroxene as much as 7 mm in length in a very fine grained to aphanitic groundmass of plagioclase, glass, and opaque minerals. In thin section, areas of the groundmass are more transparent than others; these more transparent areas contain fewer opaque minerals and are located in areas of augite concentration. Sample contains two types of plagioclase phenocrysts; some are poikilitic and have overgrown edges, and others are unaltered, free of inclusions, and may have resorbed edges. Most plagioclase phenocrysts of both types have compositions between An 60 to 70, although some may have compositions nearer to An 40.	79AWs 17	Lava			Whole-rock	61.4	0.69	17	5.81	0.13	3.05	6.55	3	1.8	0.16	100.33	4092	XRF	2.69	3.39	CO2=0.12; H2OP=0.21; H2OM=0.14	XRF

SAMPLE LOCATION

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