Alaska Volcano Observatory

Sample from low elevation flows from west (Kigushimkada) rift. Sparsely porphyritic basaltic andesite. <10% plagioclase phenocrysts (0.8 x 0.3 mm). 90% groundmass consisting of 50% plagioclase microlites (350 x 50 microns, commonly with swallowtail terminations) in a matrix of plagioclase, pyroxene, opaques, and glass. Plagioclase phenocrysts are clean; they do not contain dusty, reacted, or inclusion rich zones.

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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