Oka Plateau

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 52.7°N
  • 98.98°E

  • 2077 m
    6813 ft

  • 302060
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Oka Plateau.

The Global Volcanism Program has no Weekly Reports available for Oka Plateau.

The Global Volcanism Program has no Bulletin Reports available for Oka Plateau.

A group of small basaltic cinder cones on the Oka Plateau, about 200 km WNW of the SW tip of Lake Baikal, was the source of a postglacial alkalic-basalt lava flow that traveled 75 km down the Zhom-Bolok River. The morphologically youthful flow bends around glacial moraines and fills an erosional valley in an older flow dated at 12,000 +/- 4000 yrs BP (Before Present). Other young eruptions, such as those from the 90-m-high Kropotkin cinder cone and 120-m-high Peretolchin cone, produced voluminous lava flows not yet dated, and another Holocene cinder cone, Strariy, is located nearby. This area is part of the East Sayan volcanic region; Holocene activity took place in the Todzha Basin, which is separated from the Oka Plateau by the Great Sayan Ridge.

The Global Volcanism Program is not aware of any Holocene eruptions from Oka Plateau. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Oka Plateau page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.

Oka Upland Volcanic Field | East Sayan Volcanic Field

Feature Name Feature Type Elevation Latitude Longitude
Kropotkin Cinder cone 2077 m 52° 42' 0" N 98° 59' 0" E
Peretolchin Cinder cone 2050 m 52° 43' 0" N 98° 58' 0" E
Pertolichina Cinder cone 2050 m 52° 43' 0" N 98° 58' 0" E
Strariy Cinder cone 2030 m 52° 36' 0" N 98° 54' 0" E
The rugged surface of the Zhom-Bolok lava flow fills the valley of the Oka River. The massive Holocene lava flow traveled 75 km from its source, a cinder cone in the Oka Plateau.

Photo by Jim Luhr, 1991 (Smithsonian Institution).
A group of small basaltic cinder cones were erupted on the Oka Plateau, about 200 km WNW of the SW tip of Lake Baikal. Two of the cinder cones are seen here from the SE. The eroded cone at the lower right is Strariy. The young cone (left center) is Peretolchin volcano, named after a geologist who disappeared in the early 20th century, prior to the Russian revolution. Peretolchin cone was the source of the voluminous 75-km-long Zhom-Bolok lava flow, one of the world's longest Holocene lava flows.

Photo by Sergei Rasskazov, 1995 (Siberian Branch, USSR Academy of Sciences).
The massive Zhom-Bolok lava flow, which traveled about 75 km down the Oka River, is seen here near its terminous, where it is 1.5 km wide. An earlier lava flow that was dated at 12,000 +/- 4000 years by thermoluminescence was erosionally dissected, after which the Holocene Zhom-Bolok flow traveled down a gorge cut in the older flow.

Photo by Sergei Rasskazov, 1995 (Siberian Branch, USSR Academy of Sciences).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Hasenaka T, Litasov Y, Taniguchi H, Miyamoto T, Fujimaki H, 1999. Cenozoic volcanism in Siberia: a review. Center for Northeast Asian Studies, Tohoku Univ, no 3, p 249-272.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Rasskazov S V, 1992. . (pers. comm.).

Rasskazov S V, Kunk M J, Luhr J F, Bowring S A, Brandt I S, Brandt S B, Ivanov A V, 1996. Episodes of eruptions and composition variations of the Quaternary lavas in the Baikal Rift System (Ar-Ar and K-Ar dating of volcanism in the Dzhida River area). Russian Geol Geophys, 37(6): 1-12.

Whitford-Stark J L, 1987. . (pers. comm.).

Whitford-Stark J L, 1987. A survey of Cenozoic volcanism on mainland Asia. Geol Soc Amer Spec Pap, 213: 1-74.

Volcano Types

Cinder cone(s)

Tectonic Setting

Rift zone
Continental crust (> 25 km)

Rock Types

Basalt / Picro-Basalt


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Affiliated Databases

Large Eruptions of Oka Plateau Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.