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SAMPLE INFO : 94SJP11A

Sample ID:	94SJP11A
Station ID:	94SJP11A
Latitude:	62.28850246
Longitude:	-143.267
Datum:	NAD83
Date Sampled:	1994-00-00
Sample Type 1:	Lava
Sample Type 2:	Dike

Text Description:
A vertical dike trending S65°E that intruded into the brecciated unit (sBA9) at Site 12. There is a 10 cm chill margin that is very glassy. Fine grained, vesicular, hypocrystalline, seriate porphyritic with a matrix of plagioclase, opaque, pale brown glass, microlites and orthopyroxene?. Plagioclase phenocrysts (An39 - An52) are up to 1.7 mm and both normal and oscillatory zoning are common; the largest grains often have thin overgrowth rims. Amphibole phenocrysts are up to 0.8 mm, and dehydrated to granular opaque masses with green-brown pleochroic cores; most grains are entirely replaced. Orthopyroxene phenocrysts are up to 0.25 mm. Opaque phenocrysts are up to 0.5 mm (primary not pseudomorphs after amphibole). 83.7% matrix, 10.1% plagioclase, 0.3% opaque, 0.1% altered phase, 0.1% alteration, 5.7% vesicles. Trachydacite.

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
94SJP11A	62.28850246	-143.267	Preece, S. J.	1994-00-00		Skookum Creek		Nabesna B-5; T6N, R12E, S19	A vertical dike trending S65°E that intruded into the brecciated unit (sBA9) at Site 12. There is a 10 cm chill margin that is very glassy. Fine grained, vesicular, hypocrystalline, seriate porphyritic with a matrix of plagioclase, opaque, pale brown glass, microlites and orthopyroxene?. Plagioclase phenocrysts (An39 - An52) are up to 1.7 mm and both normal and oscillatory zoning are common; the largest grains often have thin overgrowth rims. Amphibole phenocrysts are up to 0.8 mm, and dehydrated to granular opaque masses with green-brown pleochroic cores; most grains are entirely replaced. Orthopyroxene phenocrysts are up to 0.25 mm. Opaque phenocrysts are up to 0.5 mm (primary not pseudomorphs after amphibole). 83.7% matrix, 10.1% plagioclase, 0.3% opaque, 0.1% altered phase, 0.1% alteration, 5.7% vesicles. Trachydacite.	94SJP11A	Lava			Whole-rock	64.94	0.62	16.89	4.17	0.21	1.08	2.96	6.01	1.86	0.31	99.27	55	DCP	4.58	4.17	LOI=0.93	DCP		19.8	594	433															46	458	17.8				5.6	0.8	6	2	bdl			2	3	103	19.5					55	XRF: Rb, Zr, Nb, Th, U, Ni, Ga; DCP: Ba, Sc, V; MX: Sr, Y, Cu, Zn;

SAMPLE LOCATION

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