Clear Lake Volcanic Field

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Clear Lake Volcanic Field
Elevation 4,724 ft (1,440 m)[1]
Location
Location Lake County, California,
United States
Range North Coast Ranges
Coordinates 38°58′N 122°46′W / 38.97°N 122.77°W / 38.97; -122.77[2]
Topo map USGS Kelseyville
Geology
Type lava domes, cinder cones, maars within volcanic field[2]
Age of rock less than 2.1 million years[3]
Last eruption Holocene[2]

The Clear Lake Volcanic Field is a volcanic field beside Clear Lake in California's northern Coast Ranges. The site of late-Pliocene to early Holocene activity, the volcanic field consists of lava domes, cinder cones, and maars with eruptive products varying from basalt to rhyolite.[2] Cobb Mountain and Mount Konocti are the two highest peaks in the volcanic field, at 4,724 feet (1,440 m)[1] and 4,285 feet (1,306 m)[4] respectively.

The field's magma chamber also powers a geothermal field called The Geysers, which hosts the largest complex of geothermal power plants in the world.[5] These can generate approximately 2000 megawatts, enough to power two cities the size of San Francisco.[3]

The Clear Lake volcanics are thought to have been the heat source for the hot springs anf hydrothermal activity that formed the mercury ores at the Sulphur Bank Mine, and the gold ore at the McLaughlin Mine.[6]

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