HOLOCENE MORPHOLITHOGENESIS IN THE LAKE BASINS OF SOUTHEASTERN TRANSBAIKALIA
https://doi.org/10.7868/S0435428118020013
Abstract
Considered is the functioning of the lake drainage basins of Dauria in the Holocene. Phases of relief formation were distinguished that correspond to transgressive and regressive events in lake basins controlled by climatic variations in levels and lake areas. During transgressive phases, sediments are collected in the lake basins due to coastal processes, cryogenic weathering, fluvial, slope and biogenic accumulation. In regressive phases, dry bottoms and slopes of lake basins are affected by aeolian action, formation of blowing- out depressions, and sediments are transported by prevailing winds out of the basins, presumably southeastward. Massive accumulation of fluvial sediments transported from small dry valleys was recorded in the lake basins repeatedly in the period 7–8.5 cal. ka BP and at the Atlantic/Subboreal transition. The period of stabilization of lake levels and soil formation during the Atlantic period has been identified. Two stages of cryogenic processes activation at 9.2 and 3.5 cal ka BP were revealed in the deposits of the first terrace of Lake Khara-Nur. Most detailed reconstruction was produced for the Late Holocene, for which the high-resolution stratigraphic records allowed to recognize the switches of geomorphological and sedimentological conditions each 500 years. In the last 10 thousand years, the overall tendency of lake area decrease and the rise of the contribution of aeolian processes in the morpholithogenesis was deduced at the background of general climate aridization.
About the Authors
O. I. BAZHENOVA
Sochava Institute of Geography SB RAS
Irkutsk Scientific Center, SB RAS
Russian Federation
Irkutsk, Russia
Russian Federation
Irkutsk, Russia
A. A. CHERKASHINA
Sochava Institute of Geography SB RAS
Russian Federation
Irkutsk, Russia
Russian Federation
Irkutsk, Russia
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Review
For citations:
BAZHENOVA O.I., CHERKASHINA A.A. HOLOCENE MORPHOLITHOGENESIS IN THE LAKE BASINS OF SOUTHEASTERN TRANSBAIKALIA. Geomorfologiya. 2018;(2):4-19. (In Russ.) https://doi.org/10.7868/S0435428118020013
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