IntroductionA postglacial alkalic-basaltic lava flow from the Oka Plateau has a length of 75 km following the Zhom-Bolok River. The flow has young morphology and bends around glacial moraines and fills an erosional valley in an older flow which was dated at 12,000 +/- 4000 yrs BP..
Other young eruptions include the 90-m-high Kropotkin cinder cone and 120-m-high Peretolchin cone. Both produced voluminous lava flows not yet dated. Another Holocene cinder cone, Strariy, is located nearby.
The Oka Plateau is part of the larger East Sayan volcanic region; Holocene activity took also place in the Todzha Basin, which is separated from the Oka Plateau by the Great Sayan Ridge.
(Smithsonian / GVP)
See also: Sentinel hub | Landsat 8