Alaska Volcano Observatory

Sample from ridge-crest outcrop at 3320 ft elevation 9 km east southeast of Douglas summit. Non-volcanic country-rock underlies Douglas lavas below this sample. Porphyritic two-pyroxene andesite. Phenocrysts of plagioclase (35%, up to 1.3 x 0.7 mm), and pyroxene (15%, up to 0.4 x 0.2 mm) in a groundmass 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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