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- Title
Late Pleistocene Paleosols in the North of Western Siberia: Paleorecords of Natural Environment and a Component of the Modern Soil Cover.
- Authors
Sedov, S. N.; Sheinkman, V. S.
- Abstract
The results of the search for and study of the Late Pleistocene soils in the north of Western Siberia are described. The theoretical basis is an ice-free model of the evolution of Pleistocene landscapes in the region, because the alternative model of its glacial cover excludes the preservation of paleosols. Glacial deposits are absent in this region, and paleosol levels are detectable in the sections of high river terraces exposing the Late and Middle Pleistocene sediments. They correspond to the chronointervals with landscape conditions favorable for pedogenesis; namely, soils of the (1) Kazantsevo thermochron (marine isotope-oxygen stage MIS5 overlying the Middle Pleistocene alluvium), (2) Karginsky interstadial (MIS3), and (3) the end of Sartan cryochron (MIS2). The pedogenetic interpretation of these paleosols is based on morphogenetic analysis, including micromorphological examination. According to this analysis, (i) the stage of taiga soil formation with clay illuviation in the polygenetic profile of MIS5 paleosol was replaced by a colder tundra phase with suprapermafrost gleying; (ii) characteristic of the MIS3 paleosols were tundra-steppe conditions, under which gleying and cryogenesis were combined with the neoformation of carbonates; and (iii) the paleosol level of the end of MIS2 was the result of tundra-swamp pedogenesis and included gleyed pedosediments that filled ice-wedge pseudomorphs. The latter fact allows us to identify the Late Sartan Taz–Nadym cryogenic soil horizon. The results are correlated with synchronous stratigraphic schemes for adjacent regions suggesting the construction of the soil–permafrost paleorecord for the north of Western Siberia. This is important, because the interpretation of the modern surface soils requires special approaches in order to take into account relict pedogenic horizons that are often found in their profiles.
- Subjects
SIBERIA (Russia); PALEOPEDOLOGY; PLEISTOCENE Epoch; SOIL horizons; GLACIAL drift; CLAY soils; GLACIAL landforms
- Publication
Eurasian Soil Science, 2024, Vol 57, Issue 1, p100
- ISSN
1064-2293
- Publication type
Article
- DOI
10.1134/S1064229323602470