Alaska Volcano Observatory

Porphyritic andesite lava flow containing phenocrysts of plagioclase, clinopyroxene, and olivine in a trachytic groundmass. The olivine is largely altered to serpentine minerals, while the clinopyroxene and groundmass are partially altered to carbonate and chlorite.

Sample Location:

+−

The National Map (Topo) The National Map (Imagery) The National Map (Topo + Imagery) The National Map (Shaded Relief)

Elevated Volcanoes Instrumented Volcanoes Uninstrumented Volcanoes Communities Webcams Instruments Earthquakes Geologic Sites

Legend

	Red (Warning)
	Orange (Watch)
	Yellow (Advisory)
	Green (Normal)
	Uninstrumented

200 km

100 mi

Leaflet | U.S. Department of the Interior | U.S. Geological Survey | Policies

References Cited

[1] The igneous petrology and geochemistry of northern Akutan Island, Alaska, 1982

Romick, J. D., 1982, The igneous petrology and geochemistry of northern Akutan Island, Alaska: University of Alaska Fairbanks unpublished M.S. thesis, 151 p.

USGS Volcano Notification Service
Contact AVO
Privacy
Accessibility
Information Quality
FOIA

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137 and G23AC00070.

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.