Alaska Volcano Observatory

Sample from small outcrop at `1300 ft elevation at western striped glacier margin. Porphyritic dacite. Phenocrysts of plagioclase (35 %, up to 1.8 x 0.9 mm) and pyroxene (5%, typically stubby prisms 0.1 mm in diameter), glomerocrysts of plagioclase and pyroxene (10%, up to 1.5 mm in diameter) in a groundmass of devitrified glass.

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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