Alaska Volcano Observatory

Sample from small valley-filling lava flow exposed at the confluence of two small ice streams at about 2000 ft elevation and 3.5 km above the terminus of a small glacier. This flow is about 5 km directly southeast and downslope from Douglas summit. Porphyritic two-pyroxene andesite. Phenocrysts of plagioclase (30%, up to 1.0 x 0.3 mm), pyroxene (20%, typically 0.5 x 0.2 mm), and opaque Fe-Ti oxides in a matrix of microphenocrysts and microlites and interstitial 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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