Floodplain alluvium in the Selenga River basin: structure, age, formation stages

Yu. V. Ryzhov; V. A. Golubtsov; M. V. Smirnov

doi:10.31857/S0435428122050145

Floodplain alluvium in the Selenga River basin: structure, age, formation stages

Yu. V. Ryzhov, V. A. Golubtsov, M. V. Smirnov

https://doi.org/10.31857/S0435428122050145

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Abstract

New data on the structure and age of alluvium of river floodplains in the Selenga river basin are presented. Based on the data of field and laboratory studies of floodplain sedimentary sections, data on the morphology, composition and radiocarbon age of river sediments were obtained. There are two main levels of floodplain in Selenga river basin: low (up to 2 m), high (2–4(5) m). The main differences in the structure and composition of floodplain alluvium are associated with the morphology of river valleys, differences in the dynamics of water discharge, structural and tectonic conditions of individual river basins. It was revealed that the formation of deposits of low floodplains in the Selenga river basin began in the late Holocene. The high floodplain sediments in the Selenga river basin are characterized by Early – Late Holocene age. The chronology of sedimentation stages and soil formation have been identified. The event of a sharp change in the lithological composition of deposits, high floods (3.8–3.4 kyr BP) was established, Cryogenic deformations in the Late Holocene alluvium have been revealed.

Keywords

low floodplain, high floodplain, alluvium, sedimentation, soil formation, Holocene, Selenga river basin

About the Authors

Yu. V. Ryzhov

Institute of the Earth’s Crust SB RAS, Irkutsk; Irkutsk State University, Irkutsk; Sochava Institute of Geography SB RAS, Irkutsk
Russian Federation

V. A. Golubtsov

Institute of the Earth’s Crust SB RAS, Irkutsk; Sochava Institute of Geography SB RAS, Irkutsk
Russian Federation

M. V. Smirnov

Institute of the Earth’s Crust SB RAS, Irkutsk; Irkutsk State University, Irkutsk
Russian Federation

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Review

For citations:

Ryzhov Yu.V., Golubtsov V.A., Smirnov M.V. Floodplain alluvium in the Selenga River basin: structure, age, formation stages. Geomorfologiya. 2022;53(5):144-153. https://doi.org/10.31857/S0435428122050145