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SAMPLE INFO : 84-ARh-98

Sample ID:	84-ARh-98
Station ID:	84-ARh-98
Latitude:	62.225
Longitude:	-144.237
Datum:	NAD83
Date Sampled:	1984-00-00
Sample Type 1:	Other
Sample Type 2:	Plutonic
Field Lithology:	Rhyolite

Text Description:
Mount Sanford hypabyssal rhyolite pluton (Pleistocene). Small, massive, reddish-gray, porphyritic hornblende rhyolite associated with west Sanford eruptive center. Rock contains phenocrysts of plagioclase (5-8%, average 1 mm) and hornblende (trace to 1%, average <1 mm; locally altered), in trachyitic groundmass of plagioclase and hornblende microlites in cryptocrystalline matrix. Pluton may be ring-fracture intrusion along postulated caldera wall.

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	geologic 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-98	62.225	-144.237	Richter, D. H.	1984-00-00		Sanford		Mount Sanford rocks within Gulkana A-1 quadrangle. Latitude and longitude derived from paper map.	Mount Sanford hypabyssal rhyolite pluton (Pleistocene). Small, massive, reddish-gray, porphyritic hornblende rhyolite associated with west Sanford eruptive center. Rock contains phenocrysts of plagioclase (5-8%, average 1 mm) and hornblende (trace to 1%, average <1 mm; locally altered), in trachyitic groundmass of plagioclase and hornblende microlites in cryptocrystalline matrix. Pluton may be ring-fracture intrusion along postulated caldera wall.	84-ARh-98	Other	Quenched Inclusion	Qsr	Whole Rock	70.3	0.22	16	1.9	0.09	0.73	2.64	4.85	1.83	0.15	99.49	2262	NN	1.83	0.25	H2OP=0.93; H2OM=0.24; CO2=0.01	RAPIDA

SAMPLE LOCATION

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