Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (11): 1823-1840.doi: 10.1007/s11442-019-1681-3

• Research Articles • Previous Articles     Next Articles

Lakes of the Jom-Bolok Volcanoes Valley in the East Sayan Mts., Baikal region: Morphogenesis and potential for regional paleoenvironmental studies

Alexander SHCHETNIKOV1,2,3, Elena V. BEZRUKOVA2,4   

  1. 1.Institute of the Earth’s Crust SB Russian Academy of Sciences, Irkutsk 664033, Russia
    2.Vinogradov Institute of Geochemistry SB Russian Academy of Sciences, Irkutsk 664033, Russia
    3.Irkutsk State University, Irkutsk 664033, Russia
    4.Institute of Archaeology and Ethnography SB Russian Academy of Sciences, Novosibirsk 630090, Russia
  • Received:2017-12-12 Accepted:2018-05-03 Online:2019-11-25 Published:2019-12-05
  • About author:Shchetnikov Alexander, PhD and Senior Researcher, specialized in geomorphology and Quaternary geology. E-mail: shch@crust.irk.ru
  • Supported by:
    The Ministry of Education and Science of the Russian Federation, the State Assignment(No.IX.130.3.1.(0350-2016-0026));The Ministry of Education and Science of the Russian Federation, the State Assignment(No.IX.136.2.(0346-2016-0005));Russian Science Foundation, (geomorphology, pollen and isotopic studies)(No.16-17-10079);Russian Foundation for Basic Research(No. 16-05-00586);The Project(No. 074-02-2018-334)

Abstract:

This article describes the lake basins of the Jom-Bolok volcanic region in the East Sayan (the largest manifestation of the Holocene eruptions in Central Asia). The geomorphological position, origins, aspects of the structure and development are reviewed considering its sedimentary filling. The limnic morphogenesis here develops under the conditions of contrasting relief, high energy of neotectonic and exogenous processes. We established that Lake Khara-Nur, formed as a result of lava-damming of the Jom-Bolok river valley, emerged in its present form approximately 6500 years ago. A complex record on the environment and climatic changes, acquired from its sediments, made it possible to determine for the first time in this region the long-term trends in the development of the Middle and Late Holocene mountain geosystems and also the distinction of several paleogeographic stages of the formation of the natural environment. An average geochemical record resolution for the bottom sediments of the lake was made uniquely for the East Siberian lake records and is equal to 35 years, while the palynological record approximates 110 years.

Key words: lake morphogenesis, Holocene volcanism, lava-dammed lakes, environmental change