Alaska Volcano Observatory

West side of Spotted Glacier at 3620 ft elevation. Sample from top of cliff several hundred feet tall. Surface has been glaciated. Porphyritic two-pyroxene andesite. ~40% phenocrysts of plagioclase (up to 1.4 x 0.5 mm), pyroxene (0.8 x 0.3 mm), and opaque Fe-Ti oxides in a matrix of devitrified glass and subordinate microphenocrysts and microlites. Pl:px ~ 3:2

Sample Location:

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	Red (Warning)
	Orange (Watch)
	Yellow (Advisory)
	Green (Normal)
	Uninstrumented

300 km

200 mi

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References Cited

[1] Geochemistry of some Quaternary lavas from the Aleutian Arc and Mt. Wrangell, 2018

Nye, C.J., Beget, J.E., Layer, P.W., Mangan, M.T., McConnell, V.S., McGimsey, R.G., Miller, T.P., Moore, R.B., and Stelling, P.L., 2018, Geochemistry of some quaternary lavas from the Aleutian Arc and Mt. Wrangell: Alaska Division of Geological & Geophysical Surveys Raw Data File 2018-1, 29 p. http://doi.org/10.14509/29843

publication on DGGS website.

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