TY - JOUR

T1 - 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

AU - Sheinkman, Vladimir

AU - Sedov, Sergey

AU - Shumilovskikh, Lyudmila S.

AU - Bezrukova, Elena

AU - Dobrynin, Dmitriy

AU - Timireva, Svetlana

AU - Rusakov, Alexey

AU - Maksimov, Fedor

N1 - Publisher Copyright: Copyright © University of Washington. Published by Cambridge University Press, 2020. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2020/10/9

Y1 - 2020/10/9

N2 - 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.

AB - 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.

KW - Alluvial sediments

KW - Drop stones

KW - Environmental change

KW - Marine Isotope Stage 5-2

KW - Paleosols

KW - Pleistocene

KW - Pollen

KW - West Siberia

UR - http://www.scopus.com/inward/record.url?scp=85099753721&partnerID=8YFLogxK

U2 - 10.1017/qua.2020.74

DO - 10.1017/qua.2020.74

M3 - Article

AN - SCOPUS:85099753721

VL - 99

SP - 204

EP - 222

JO - Quaternary Research

JF - Quaternary Research

SN - 0033-5894

M1 - 0033589420000745

ER -