Alaska Volcano Observatory

Sample of Cape Kigushimkada rift lavas. Glomeroporphyritic basaltic andesite. <10% plagioclase glomerocrysts up to 1 mm diameter composed of several plagioclase crystals each (0.6 x 0.4 mm). 90% groundmass composted of plagioclase laths (350 x 90 microns) with intersertal pyroxene in a hypocrystalline matrix. Plagioclase phenocrysts and laths are free of dusty, inclusion rich zone. Plagioclase laths commonly have swallowtail terminations.

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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