Alaska Volcano Observatory

Sample from 1440 ft elevation on flow between Spotted and striped glaciers. Porphyritic andesite containing 30% phenocrysts equally distributed between plagioclase (0.8 x 0.5 mm), olivine (1.0 x 0.5 mm) and glomerocrysts of pyroxene and plagioclase (1.5 mm diameter) in a groundmass of plagioclase microlites (150 x 15 microns) with intergranular pyroxene and minor 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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