Alaska Volcano Observatory

Plutonic country rock exposed at 4500 ft elevation on the ridge between Douglas and Fourpeaked, 4.5 km southwest of Douglas summit. Quartz monzodiorite countryrock. About 60% euhedral plagioclase (up to 2 mm long), 15% pale green to pale brown amphibole, 25% interstitial quartz and feldspar intergrowths, and minor opaque oxides.

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

300 km

200 mi

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

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.

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.