The chronology and formation conditions of floodplain generations in the lower reaches of the Belaya River (Upper Angara region)

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

doi:10.31857/S2949178924040073

The chronology and formation conditions of floodplain generations in the lower reaches of the Belaya River (Upper Angara region)

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

https://doi.org/10.31857/S2949178924040073

EDN: FGISXJ

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Abstract

A geomorphological study of a key section of the Belaya River valley in the lower reaches is conducted to reconstruct the Holocene history of the development of the valley. The spatial distribution of floodplain generations of different morphology and low terrace levels is analyzed. To clarify the age relationships of various surfaces, a study of the facies structure and composition of deposits of ten pits and seven boreholes on a cross-section profile was carried out, the age of formation of alluvial strata was determined by radiocarbon dating. The structure of the longitudinal profile of the floodplain and the channel, the absence of signs of constrative accumulation of alluvium, suggests the absence of the tectonic influence on the formation of alluvium in the floodplains and low terraces of the Belaya River. However, the control of the development of a number of bands in the lower reaches of the Belaya River by system of lineaments and the associated stability of these landforms determined their representativeness for assessing the rhythm of alluvial sedimentation and the development of fluvial processes in the Holocene. The landscape-climatic changes at the end of the Late Glacial and Holocene caused the alternation of the stages of high and low water level and the stages of development of the Belaya River valley associated with them within the plain part of its basin. Stages of a relatively small river runoff, typical for time intervals 12.9–7.0; 5.6–4.5; 4.1–2.3 and 0.3–0 kyr BP changed by stages of high-water levels and active floodplain sedimentation 7.0–5.6; 4.5–4.1 and 2.3–0.3 kyr BP. The development of fluvial processes and the rhythmicity of the formation of the studied floodplains correlates well with the context of regional temperature and humidity changes during the Late Glacial and Holocene, allowing us to consider the floodplains of the left-bank tributaries of the Angara River as significant paleogeographic archives.

Keywords

river valleys, floodplain-channel complexes, alluvial deposits, Holocene, Baikal region

About the Authors

V. A. Golubtsov

Sochava Institute of geography SB RAS, Irkutsk
Russian Federation

M. Yu. Opekunova

Sochava Institute of geography SB RAS, Irkutsk; Irkutsk National Research Technical University, Irkutsk
Russian Federation

M. V. Smirnov

Sochava Institute of geography SB RAS, Irkutsk; Institute of Earth’s crust SB RAS, Irkutsk
Russian Federation

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Golubtsov V.A., Opekunova M.Yu., Smirnov M.V. The chronology and formation conditions of floodplain generations in the lower reaches of the Belaya River (Upper Angara region). Geomorfologiya i Paleogeografiya. 2024;55(4):111-128. (In Russ.) https://doi.org/10.31857/S2949178924040073. EDN: FGISXJ