AVO Sample Information

Alaska Volcano Observatory

You are here: Home > Samples > 93SJP20

SAMPLE INFO : 93SJP20

Sample ID:	93SJP20
Station ID:	93SJP20
Latitude:	62.47407338
Longitude:	-143.0635288
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, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque and feldspar. Plagioclase phenocrysts (An55) are up to 1.88 mm and oscillatory zoning is common with less abundant normal zoning, grains occasionally have orthopyroxene or opaque inclusions. Orthopyroxene phenocrysts are up to 0.7 mm with intense pleochroism (birefringence is maximum for orthopyroxene), and frequently opaque inclusions are present. Amphibole phenocrysts are up to 1.3 mm with red-brown pleochroism and some have black coronas; occasionally grains have opaque inclusions; and some opaque aggregates may be dehydrated amphibole. Opaque phenocrysts are up to 0.3 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
93SJP20	62.47407338	-143.0635288	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, holocrystalline, porphyritic to glomeroporphyritic with a matrix of cryptocrystalline material, opaque and feldspar. Plagioclase phenocrysts (An55) are up to 1.88 mm and oscillatory zoning is common with less abundant normal zoning, grains occasionally have orthopyroxene or opaque inclusions. Orthopyroxene phenocrysts are up to 0.7 mm with intense pleochroism (birefringence is maximum for orthopyroxene), and frequently opaque inclusions are present. Amphibole phenocrysts are up to 1.3 mm with red-brown pleochroism and some have black coronas; occasionally grains have opaque inclusions; and some opaque aggregates may be dehydrated amphibole. Opaque phenocrysts are up to 0.3 mm.	93SJP20	Lava			Whole-rock	66.63	0.54	16.22	3.46	0.09	1.2	3.47	4.5	2.53	0.2	99.83	55	DCP	3.82	3.46	LOI=1.12	DCP		47	858	402															18	207	6.7				6.2	2.8	6	47	14			3	5	55	16					55	XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cr, Cu, Zn;

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA

URL: avo.alaska.edu/samples/sample_info.php
Page modified: August 1, 2017 15:29
Contact Information: AVO Web Team

@alaska_avo

alaska.avo

Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.