Subaerial deposits of chernoozerye low ridge (Irtysh valley): granulometric texture, genesis, rate of sedimentation

The Chernoozerye low ridge in the Irtysh valley is an eolian structure on pleistocene fluvial terrace sediments. These eolian deposits are fine-grained, well-sorted sands with small portions of silt and clay, including two levels with former top-soils. The fractures of fine sand and large-sized aleurite are the main components. This fraction covers 60 to 80% of the material with an average grain size varying between 0.090 to 0.096. Sand accumulation was subordinate to the formation of the low ridge. The content of fine and medium silts is small in the deposits of the low ridge – from 4.9 to 11.7%, and the total proportion of particles with a diameter of less than 0.01 mm does not reach more than 22%. The eolian sediments in the low ridge’s bottom are approximately 14.9±1.5 thousand years BC (L-Eva 1975); the final phase of active eolian lithogenesis was about 11thousand years BC (L-Eva 1971, 1972). The variability of the granulometric content of rocks in the section reflects the stages of sediment formation. The activation of eolian processes in the gap between 15–10 thousand years ago was happening wavelike and included periods of their weakening 14 thousand years and 11– 10.5 thousand years BC.

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