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A multiproxy record of sedimentation, pedogenesis, and environmental history in the north of West Siberia during the late Pleistocene based on the Belaya Gora section

Published online by Cambridge University Press:  09 October 2020

Vladimir Sheinkman
Affiliation:
Earth Cryosphere Institute, SB RAS, Malygina Str. 86, Tyumen625026, Russia Tyumen Industrial University, Volodarskogo Str. 38, Tyumen625000, Russia Tyumen State University, Volodarskogo Str. 6, Tyumen625003, Russia
Sergey Sedov*
Affiliation:
Earth Cryosphere Institute, SB RAS, Malygina Str. 86, Tyumen625026, Russia Tyumen State University, Volodarskogo Str. 6, Tyumen625003, Russia Instituto de Geología, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Del. Coyoacán, CdMx, C.P.04510, Mexico
Lyudmila S. Shumilovskikh
Affiliation:
Department of Palynology and Climate Dynamics, Georg-August-University Göttingen, Wilhelm-Weber-Str. 2a, 37073, Göttingen, Germany Tomsk State University, Lenina av. 36, Tomsk634050, Russia
Elena Bezrukova
Affiliation:
Tyumen Industrial University, Volodarskogo Str. 38, Tyumen625000, Russia Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk664033Russia Irkutsk Scientific Centre, Siberian Branch, Russian Academy of Sciences, Irkutsk664033Russia
Dmitriy Dobrynin
Affiliation:
Lomonosov Moscow State University (LMSU) Marine Research Centre, LMSU Science Park, Leninskie Gory, Moscow119992, Russia
Svetlana Timireva
Affiliation:
Institute of Geography, Russian Academy of Sciences, Staromonetny pereulok 29, Moscow119017, Russia
Alexey Rusakov
Affiliation:
Saint-Petersburg State University, Universitetskaya emb., 7/9, St. Petersburg199034, Russia,
Fedor Maksimov
Affiliation:
Saint-Petersburg State University, Universitetskaya emb., 7/9, St. Petersburg199034, Russia,
*
*Corresponding author at: Instituto de Geología, UNAM, Ciudad Universitaria, Del. Coyoacán, C.P. 04510, CdMx, Mexico. Email address: sergey@geologia.unam.mx (S. Sedov).

Abstract

Recent revision of the Pleistocene glaciation boundaries in northern Eurasia has encouraged the search for nonglacial geological records of the environmental history of northern West Siberia. We studied an alluvial paleosol-sedimentary sequence of the high terrace of the Vakh River (middle Ob basin) to extract the indicators of environmental change since Marine Oxygen Isotope Stage (MIS) 6. Two levels of the buried paleosols are attributed to MIS 5 and MIS 3, as evidenced by U/Th and radiocarbon dates. Palynological and pedogenetic characteristics of the lower pedocomplex recorded the climate fluctuations during MIS 5, from the Picea-Larix taiga environment during MIS 5e to the establishment of the tundra-steppe environment due to the cooling of MIS 5d or MIS 5b and partial recovery of boreal forests with Picea and Pinus in MIS 5c or MIS 5a. The upper paleosol level shows signs of cryogenic hydromorphic pedogenesis corresponding to the tundra landscape, with permafrost during MIS 3. Boulders incorporated in a laminated alluvial deposit between the paleosols are dropstones brought from the Enisei valley by ice rafting during the cold MIS 4. An abundance of eolian morphostructures on quartz grains from the sediments that overly the upper paleosol suggests a cold, dry, and windy environment during the MIS 2 cryochron.

Type
Research Article
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2020

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