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SAMPLE INFO : 53-F-42

Sample ID:	53-F-42
Station ID:	53-F-42
Latitude:	53.88707
Longitude:	-166.93202
Datum:	NAD83
Date Sampled:	1953-01-01
Sample Type 1:	Lava
Field Lithology:	Dacite

Text Description:
Albitized dacite (?) porphyry from the Unalaska formation at Hive Bay halfway between Staraya Bay and Udagak Strait. It is light gray and contains chalky plagioclase and ferromagnesian phenocrysts 1 to 2 millimeters long. Phenocrysts compose 1 percent of the rock, consisting of subhedral laths of albite with apatite inclusions. The groundmass has an indistinct intersertal texture and consists of abundant subhedral laths of albite, a trace of a granular black opaque mineral, and a trace of quartz that may be primary. Alteration is intense, albite and kaolin are pervasive and abundant, quartz is common and intersertal; calcite is common and forms scattered patches, especially near altered ferromagnesian minerals; and chlorite and uralite (?) are common alteration products of the ferromagnesian minerals.

References:

Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, 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
53-F-42	53.88707	-166.93202	Fraser, G. D.	1953-01-01		Makushin		Unalaska formation from head of Hive Bay	Albitized dacite (?) porphyry from the Unalaska formation at Hive Bay halfway between Staraya Bay and Udagak Strait. It is light gray and contains chalky plagioclase and ferromagnesian phenocrysts 1 to 2 millimeters long. Phenocrysts compose 1 percent of the rock, consisting of subhedral laths of albite with apatite inclusions. The groundmass has an indistinct intersertal texture and consists of abundant subhedral laths of albite, a trace of a granular black opaque mineral, and a trace of quartz that may be primary. Alteration is intense, albite and kaolin are pervasive and abundant, quartz is common and intersertal; calcite is common and forms scattered patches, especially near altered ferromagnesian minerals; and chlorite and uralite (?) are common alteration products of the ferromagnesian minerals.	53-F-42	Lava			Whole-rock	67.91	0.65	15.24	3.17	0.11	0.64	1.37	5.35	4	0.14	99.89	315	NN	0.85	2.4	H2OM=0.07; H2OP=0.73; CO2=0.42; Cl=0.03; F=0.08	NN																																								315

SAMPLE LOCATION

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