AVO Sample Information

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SAMPLE INFO : 87-WAD-11

Sample ID:	87-WAD-11
Station ID:	87-WAD-11
Latitude:	62.1501
Longitude:	-144.38388
Datum:	NAD83
Date Sampled:	1987-00-00
Sample Type 1:	Lava

Text Description:
Nathlie Mountain olivine basaltic andesite flows and fragmental rocks (Pleistocene). Upper part consists of sequence of agglomerate, lapilli tuff, hyaloclastite, pillow breccia, and both pillowed and nonpillowed lava flows. Both tuff and matrix of fragmental rocks are generally palagonitized. Lower part consists chiefly of sequence of medium-thickness to thick (10-90 m), dark-gray to greenish-black flows that locally exhibit highly developed columnar joints. Single flow of hornblende dacite is present low in section. Lavas from both upper and lower parts of unit are chiefly aphyric to strikingly porphyritic olivine basaltic andesite. * * * Source of dacite flow is apparently local; olivine basaltic andesite lavas may all have originated at Mount Sanford.

References:

Geologic map of the Gulkana A-1 Quadrangle, south-central 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
87-WAD-11	62.1501	-144.38388	Duffield, W. A.	1987-00-00		Sanford		Mount Sanford (?) rocks on Nathlie Mountain within Gulkana A-1 quadrangle. Latitude and longitude derived from paper map.	Nathlie Mountain olivine basaltic andesite flows and fragmental rocks (Pleistocene). Upper part consists of sequence of agglomerate, lapilli tuff, hyaloclastite, pillow breccia, and both pillowed and nonpillowed lava flows. Both tuff and matrix of fragmental rocks are generally palagonitized. Lower part consists chiefly of sequence of medium-thickness to thick (10-90 m), dark-gray to greenish-black flows that locally exhibit highly developed columnar joints. Single flow of hornblende dacite is present low in section. Lavas from both upper and lower parts of unit are chiefly aphyric to strikingly porphyritic olivine basaltic andesite. * * * Source of dacite flow is apparently local; olivine basaltic andesite lavas may all have originated at Mount Sanford.	87-WAD-11	Lava			Whole-rock	53.2	1.58	17.2	8.81	0.14	4.47	7.64	3.84	1.21	0.41	100.54	2262	NN	3.29	5.87	H2OP=0.94; H2OM=0.62; CO2=0.01	RAPIDA

SAMPLE LOCATION

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