AVO Sample Information

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SAMPLE INFO : 93SJP21

Sample ID:	93SJP21
Station ID:	93SJP21
Latitude:	62.4751846
Longitude:	-143.0665843
Datum:	NAD83
Date Sampled:	1993-00-00
Sample Type 1:	Lava
Field Lithology:	Dacite

Text Description:
Float boulder of silicic material at Site 1 in the Boyden Hills. Fine-grained, vesicular, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque, feldspar and microlites. Cognate inclusions of equigranular masses of plagioclase, opaque, orthopyroxene and biotite are present. There is no melt reaction between the inclusion and the host. Plagioclase phenocrysts (An43 - An53) are up to 2.2 mm and both oscillatory and normal zoning are common. Orthopyroxene phenocrysts are up to 2.75 mm, with intense pleochroism (birefringence at maximum for orthopyroxene) and large opaque inclusions. Dehydrated amphibole is present as opaque aggregates. Opaque phenocrysts up to 1.55 mm (does not appear to be aggregate). Biotite phenocrysts are up to 0.2 mm.

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
93SJP21	62.4751846	-143.0665843	Preece, S. J.	1993-00-00		Skookum Creek		Nabesna B-5; T8N, R13E, S18	Float boulder of silicic material at Site 1 in the Boyden Hills. Fine-grained, vesicular, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque, feldspar and microlites. Cognate inclusions of equigranular masses of plagioclase, opaque, orthopyroxene and biotite are present. There is no melt reaction between the inclusion and the host. Plagioclase phenocrysts (An43 - An53) are up to 2.2 mm and both oscillatory and normal zoning are common. Orthopyroxene phenocrysts are up to 2.75 mm, with intense pleochroism (birefringence at maximum for orthopyroxene) and large opaque inclusions. Dehydrated amphibole is present as opaque aggregates. Opaque phenocrysts up to 1.55 mm (does not appear to be aggregate). Biotite phenocrysts are up to 0.2 mm.	93SJP21	Lava			Whole-rock	67.3	0.56	16.61	3.56	0.08	0.8	3.56	4.85	2.28	0.15	99.17	55	DCP	3.91	3.56	LOI=0.23	DCP		46	869	405															18	199	6				5.3	2.6	5.7	39	1			6	8	52	16.3					55	XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn;

SAMPLE LOCATION

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