AVO Sample Information

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SAMPLE INFO : BCM-15

Sample ID:	BCM-15
Station ID:	BCM-15
Latitude:	62.2977
Longitude:	-143.61138
Datum:	NAD83
Sample Type 1:	Lava
Sample Type 2:	Flow
Field Lithology:	Andesite

Text Description:
Wrangell Lava. Tanada volcano. Intracaldera flows. Medium to thick (5-30 m), dark-gray to greenish-gray, porphyritic andesite flows. Chiefly augite-olivine andesites containing phenocrysts of plagioclase (5-20%, 1-10 mm), augite (trace to 3%, 1-2 mm), and olivine (trace to 2%, 3-5 mm) in a pilotaxitic to intergranular groundmass. Mafic minerals generally altered to clay minerals and serpentine; vesicles mostly filled with celadonite and calcite. Pyroclastic deposits, shown by dashed line labeled t, are chiefly bedded andesite lapilli airfall tuffs. An area of brecciation, hydrothermal alteration, and small dikes, shown by small triangles, occurs in the south-central part of the caldera and may mark the locus of long-lived post-caldera eruptive and thermal activity.

References:

Geologic map of the Nabesna B-6 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
BCM-15	62.2977	-143.61138	Unknown, Unknown			Tanada Peak		Wrangell Lava; Nabesna B-6 quadrangle. Latitude and longitude derived from paper map.	Wrangell Lava. Tanada volcano. Intracaldera flows. Medium to thick (5-30 m), dark-gray to greenish-gray, porphyritic andesite flows. Chiefly augite-olivine andesites containing phenocrysts of plagioclase (5-20%, 1-10 mm), augite (trace to 3%, 1-2 mm), and olivine (trace to 2%, 3-5 mm) in a pilotaxitic to intergranular groundmass. Mafic minerals generally altered to clay minerals and serpentine; vesicles mostly filled with celadonite and calcite. Pyroclastic deposits, shown by dashed line labeled t, are chiefly bedded andesite lapilli airfall tuffs. An area of brecciation, hydrothermal alteration, and small dikes, shown by small triangles, occurs in the south-central part of the caldera and may mark the locus of long-lived post-caldera eruptive and thermal activity.	BCM-15	Lava			Whole-rock	55.9	1.05	18	6.41	0.13	4.16	7.7	3.74	1.26	0.32	99.53	2321	NN	3.08	3.59	H2OP=0.5; H2OM=0.73; CO2=0.01	RAPIDA

SAMPLE LOCATION

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