AVO Sample Information

Alaska Volcano Observatory

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SAMPLE INFO : 415

Sample ID:	415
Station ID:	415
Latitude:	58.2654
Longitude:	-155.1591
Datum:	NAD83

Text Description:
Porphyritic specimen. Examination in thin section reveals that the specimen is made up largely of the outer shells of fresh-looking phenocrystic and lathlike feldspars, with interiors replaced by isotropic glass. A little quartz and one or two small crystals of an altered ferromagnesian mineral, probably biotite, are also present. The feldspathic shells are thin, but each is fairly continuous, and both twinning and zoning are plainly visible. The appearance suggests an andesite or a fine-grained diorite as the original rock.

References:

The Katmai magmatic province

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
415	58.2654	-155.1591	Fenner, C. N.			Novarupta			Porphyritic specimen. Examination in thin section reveals that the specimen is made up largely of the outer shells of fresh-looking phenocrystic and lathlike feldspars, with interiors replaced by isotropic glass. A little quartz and one or two small crystals of an altered ferromagnesian mineral, probably biotite, are also present. The feldspathic shells are thin, but each is fairly continuous, and both twinning and zoning are plainly visible. The appearance suggests an andesite or a fine-grained diorite as the original rock.	415				Whole-rock	85.03	0.94	7.83		0.01	0.37	2.33	2.27	0.61	0.1	99.9	1176	NN	0.27	0.34	H2OP=2.35; H2OM=4.9; Cl=0.77	NN																																								1176

SAMPLE LOCATION

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