AVO Sample Information

Alaska Volcano Observatory

You are here: Home > Samples > 94SJP26

SAMPLE INFO : 94SJP26

Sample ID:	94SJP26
Station ID:	94SJP26
Latitude:	62.44
Longitude:	-143.1263032
Datum:	NAD83
Date Sampled:	1994-00-00
Sample Type 1:	Lava
Sample Type 2:	Dike
Field Lithology:	Andesite

Text Description:
A 4-5' thick, platy dike trending N25E that intrudes silicic rubble from Dome A near Site 5. Further up in the section, the dike flattens out to become a sill that intrudes into a lahar/pyroclastic flow package at Site 5. There is no bake zone with the lahar/pyroclastic flow. The sill then twists up vertically cutting through blocky autobrecciated? flows. Fine-grained, holocrystalline, intergranular, seriate porphyritic with matrix of mesostasis, red alteration patches, opaque, plagioclase and clinopyroxene. Plagioclase phenocrysts (An17-An49) are up to 1.8 mm and most large grains have sieve textured intermediate zones, complex zoning, and a few include orthopyroxene and matrix along rim. Orthopyroxene phenocrysts are up to 1.0 mm and display thick clinopyroxene rims, opaque and melt inclusions, and several have resorbed edges.

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
94SJP26	62.44	-143.1263032	Preece, S. J.	1994-00-00		Skookum Creek		Nabesna B-5, T8N, R12E, S26	A 4-5' thick, platy dike trending N25E that intrudes silicic rubble from Dome A near Site 5. Further up in the section, the dike flattens out to become a sill that intrudes into a lahar/pyroclastic flow package at Site 5. There is no bake zone with the lahar/pyroclastic flow. The sill then twists up vertically cutting through blocky autobrecciated? flows. Fine-grained, holocrystalline, intergranular, seriate porphyritic with matrix of mesostasis, red alteration patches, opaque, plagioclase and clinopyroxene. Plagioclase phenocrysts (An17-An49) are up to 1.8 mm and most large grains have sieve textured intermediate zones, complex zoning, and a few include orthopyroxene and matrix along rim. Orthopyroxene phenocrysts are up to 1.0 mm and display thick clinopyroxene rims, opaque and melt inclusions, and several have resorbed edges.	94SJP26	Lava			Whole-rock	57.36	0.86	17.97	5.57	0.12	4.36	7.26	3.9	1.5	0.37	98.8	55	DCP	6.08	5.57	LOI=0.73	DCP		27	575	548															19	130	4.1				4.5	2.4	18.4	153	72			75	49	61	17.6					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.