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SAMPLE INFO : 84-ARh-97

Sample ID:	84-ARh-97
Station ID:	84-ARh-97
Latitude:	62.213
Longitude:	-144.22798
Datum:	NAD83
Date Sampled:	1984-00-00
Sample Type 1:	Lava
Sample Type 2:	Flow
Field Lithology:	Dacite

Text Description:
Mount Sanford Dacite flows (Pleistocene). Massive, light- to medium-light-gray, conspicuously porphyritic dacite flows on west and southeast flanks of Mount Sanford. Flow on west flank contains phenocrysts of plagioclase (4-6%, 1-2 mm), hornblende (2-3%, 1 mm; mostly altered to opaque minerals), and opaque minerals (trace), in trachytic to cryptocrystalline groundmass. Flow fills pronounced topographic low that is possibly along postulated caldera wall; maximum thickness about 500 m. Flow on southeast flank is coarsely porphyritic, containing phenocrysts of plagioclase (15-20%, as large as 1 cm), clinopyroxene (1-3%, 1-2 mm), opaque minerals (1%), and biotite (trace), in microfelty groundmass that consists chiefly of feldspar. Maximum thickness about 150 m.

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
84-ARh-97	62.213	-144.22798	Richter, D. H.	1984-00-00		Sanford		Mount Sanford rocks within Gulkana A-1 quadrangle. Latitude and longitude derived from paper map.	Mount Sanford Dacite flows (Pleistocene). Massive, light- to medium-light-gray, conspicuously porphyritic dacite flows on west and southeast flanks of Mount Sanford. Flow on west flank contains phenocrysts of plagioclase (4-6%, 1-2 mm), hornblende (2-3%, 1 mm; mostly altered to opaque minerals), and opaque minerals (trace), in trachytic to cryptocrystalline groundmass. Flow fills pronounced topographic low that is possibly along postulated caldera wall; maximum thickness about 500 m. Flow on southeast flank is coarsely porphyritic, containing phenocrysts of plagioclase (15-20%, as large as 1 cm), clinopyroxene (1-3%, 1-2 mm), opaque minerals (1%), and biotite (trace), in microfelty groundmass that consists chiefly of feldspar. Maximum thickness about 150 m.	84-ARh-97	Lava			Whole-rock	63.3	0.61	16.9	4.6	0.08	2.99	5.81	3.9	1.57	0.18	99.92	2262	NN	2.42	2.41	H2OP=0.05; H2OM=0.05; CO2=0.01	RAPIDA

SAMPLE LOCATION

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