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Capital Mountain description and information


Official Name: Capital Mountain
Type:Shield volcano
Most Recent Activity:-1088050
Seismically Monitored: No
Elevation: 7730 ft (2356 m)
Latitude: 62.4238° N
Longitude:144.1127° W
Quadrangle:Gulkana Nabesna
CAVW Number:315801
Pronunciation: Sound file
Nearby towns:Chistochina 20 mi (32 km) NW
Slana 20 mi (32 km) NE
Mentasta Lake 37 mi (59 km) NE
Gakona 39 mi (63 km) SW
Anchorage 206 mi (332 km) SW
From Wood and Kienle (1990) [1]: "Capital Mountain is a relatively small andesitic shield volcano with a roughly circular summit caldera 4 km in diameter. The shield consists chiefly of lava flows and subordinate volcaniclastic rocks that dip 3 to 25 degrees away from the summit area. The caldera, apparently of non-explosive origin, is filled with thick, flat-lying flows. Talus, flow breccias, and pillow lavas occur locally between the caldera wall and intracaldera flows. A prominent andesite plug, 100 m high, marks the general center of an area of post-caldera-fill activity and is the locus of a spectacular radial dike swarm. Shield and intracaldera lavas are chiefly hypersthene andesite, but shield lavas range in composition from basalt to dacite. Dikes are also chiefly andesite; one prominent rhyolite dike originating from a small rhyolite laccolith extends almost completely across the volcano."
Volcanoes of North America: United States and Canada, 1990
Wood, C. A., and Kienle, Juergen, (eds.), 1990, Volcanoes of North America: United States and Canada: New York, Cambridge University Press, 354 p.

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Page modified: September 29, 2020 12:19
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