AVO Sample Information

Alaska Volcano Observatory

You are here: Home > Samples > 81ARj 11b

SAMPLE INFO : 81ARj 11b

Sample ID:	81ARj 11b
Station ID:	81ARj 11b
Latitude:	57.707612521224
Longitude:	-156.41
Datum:	NAD83
Date Sampled:	1981-01-01
Sample Type 1:	Other
Sample Type 2:	Breccia
Field Lithology:	Dacite

Text Description:
Vitric clast from volcanic breccia. Porphyritic plagioclase-pyroxene-hornblende dacite (S; high-silica andesite G). Glassy groundmass contains abundant randomly oriented phenocrysts of plagioclase (An 70), clinopyroxene, hornblende, and biotite. Clinopyroxene are pleochroic from tan to pale green, hornblende is pleochroic from brown to yellow brown. Hornblende and biotite crystals outlined in opaque minerals, clinopyroxene altered on edges to brown aphanitic phase. Plagioclase is variably zoned.

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
81ARj 11b	57.707612521224	-156.41	Riehle, J. R.	1981-01-01		Ugashik caldera		Ugashik C-2, Ugashik caldera	Vitric clast from volcanic breccia. Porphyritic plagioclase-pyroxene-hornblende dacite (S; high-silica andesite G). Glassy groundmass contains abundant randomly oriented phenocrysts of plagioclase (An 70), clinopyroxene, hornblende, and biotite. Clinopyroxene are pleochroic from tan to pale green, hornblende is pleochroic from brown to yellow brown. Hornblende and biotite crystals outlined in opaque minerals, clinopyroxene altered on edges to brown aphanitic phase. Plagioclase is variably zoned.	81ARj 11b	Other	Quenched Inclusion		Whole-rock	62.5	0.59	17.8	4.79	0.12	2.74	6.44	3.4	1.46	0.14	98.06	4092	XRF	3.35	1.67

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.