Alaska Volcano Observatory

Sample of lava flow at north end of Black Creek beach. Outcrop consists of large bulbous pillow-like masses, commonly with radial fracture. Fine grained, equigranular andesite with microphenocrysts of plagioclase (0.4 x 0.1 mm) and subordinate pyroxene (0.3 x 0.1 mm) with sparse opaque oxide (0.2 mm). Hypocrystalline groundmass comprises about 50% of the sample. Plagioclase microphenocrysts 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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