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STRUCTURAL FEATURES OF THE UPPER-PLEISTOCENE LOESS-SOIL SEQUENCE OF THE KOLYVAN KNAP IN THE PREDALTAI PLAIN

V. S. Zykina, A. O. Volvakh, V. S. Zykin, N. E. Volvakh

V. S. Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia

The article presents a comparative analysis of the stratigraphic loess-soil sequence (LSS) of the Late and partly Middle Pleistocene of the Petropavlovskoye section. The structure of the loessial strata of the submountain region of Gorny Altai is correlated with the LSS structure of the southern West Siberia. Fossil soils combined into pedocomplexes indicating the predominance of forest-steppe, steppe and dry-steppe subboreal soil formation, reflecting the climatic conditions of their formation and the duration of warm intervals from the beginning of and during Late Pleistocene have been thoroughly characterized. Results of morphometry and morphoscopy of sand quartz grains which have confirmed the eolian genesis of loess horizons formed in cryoarid conditions are presented.

Keywords: loess-soil sequence, Predaltai Plain, West Siberia, Pleistocene, fossil soils, morphoscopy of quartz grains, paleogeography, stratigraphy.

DOI 10.20403/2078-0575-2018-3-54-64