A multiproxy record of sedimentation, pedogenesis, and environmental history in the north of West Siberia during the late Pleistocene based on the Belaya Gora sectionстатья
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Аннотация:Recent revision of the Pleistocene glaciation boundaries in northern Eurasia has encouraged the search for nonglacial geologicalrecords of the environmental history of northernWest Siberia.We studied an alluvial paleosol-sedimentary sequenceof the high terrace of the Vakh River (middle Ob basin) to extract the indicators of environmental change since Marine OxygenIsotope Stage (MIS) 6. Two levels of the buried paleosols are attributed to MIS 5 and MIS 3, as evidenced by U/Th andradiocarbon dates. Palynological and pedogenetic characteristics of the lower pedocomplex recorded the climate fluctuationsduring MIS 5, from the Picea-Larix taiga environment during MIS 5e to the establishment of the tundra-steppe environmentdue 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. Theupper paleosol level shows signs of cryogenic hydromorphic pedogenesis corresponding to the tundra landscape, with permafrostduring MIS 3. Boulders incorporated in a laminated alluvial deposit between the paleosols are dropstones broughtfrom the Enisei valley by ice rafting during the cold MIS 4. An abundance of eolian morphostructures on quartz grainsfrom the sediments that overly the upper paleosol suggests a cold, dry, and windy environment during the MIS 2 cryochron.
