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Black Peak description and information


Official Name: Black Peak
Type:Stratovolcano and lava domes
Most Recent Activity:-2750
Seismically Monitored: No
Elevation: 3386 ft (1032 m)
Latitude: 56.5512° N
Longitude:158.787° W
CAVW Number:312080
Pronunciation: Sound file
Nearby towns:Chignik Lagoon 19 mi (31 km) SE
Chignik Lake 20 mi (33 km) SE
Chignik 23 mi (37 km) SE
Port Heiden 28 mi (45 km) NE
Anchorage 452 mi (727 km) NE
From Wood and Kienle (1990) [1]: "Black Peak is a deeply eroded, highly altered stratovolcano/dome complex with a small caldera at its eastern edge. The caldera is ice-free and contains two small lakes; most of the interior of the caldera is occupied by a complex of nested dacitic domes. The volcano rests on a north-dipping basement of Pliocene volcanogenic non-marine sedimentary rocks.

"The flows, domes, and volcaniclastic rocks that make up the pre-caldera cone range in composition from andesite to dacite. Dacitic ash-flow tuffs and coarse block-and-ash flows fill the Bluff and Ash Creek valleys to as much as 100 m on the north and west sides of the volcano. The pyroclastic flows that deposited these tuffs had limited distribution and appear to have been relatively sluggish; they also appear to have had a large air-fall component, judging from the crude stratification in the ash-flow tuff. In spite of the caldera's small diameter, the widespread climactic air fall and the thickness of the ash-flow tuffs suggest a bulk eruption volume of >10 cubic km."

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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