Alaska Volcano Observatory

Sample from outcrop at ~3000 ft on ridge dividing upper Spotted Glacier and striped glacier. Porphyritic two-pyroxene andesite. Phenocrysts of plagioclase (35%, up to 0.9 x 0.4 mm), pyroxene (10%, typically 0.5 x 0.2 mm), and subordinate chromite-bearing olivine in a matrix of devitrified glass and subordinate microphenocrysts and microlites.

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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