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Reconstruction of Final Late Pleistocene and Holocene Paleogeographic Conditions in the Middle Yenisei Valley Based on a Comprehensive Analysis of Sediments from the First Floodplain Terrace of the Berezovka River
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Reconstruction of Final Late Pleistocene and Holocene Paleogeographic Conditions in the Middle Yenisei Valley Based on a Comprehensive Analysis of Sediments from the First Floodplain Terrace of the Berezovka River
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Reconstruction of Final Late Pleistocene and Holocene Paleogeographic Conditions in the Middle Yenisei Valley Based on a Comprehensive Analysis of Sediments from the First Floodplain Terrace of the Berezovka River
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Journal Article
Reconstruction of Final Late Pleistocene and Holocene Paleogeographic Conditions in the Middle Yenisei Valley Based on a Comprehensive Analysis of Sediments from the First Floodplain Terrace of the Berezovka River
2025
Overview
The present study reports the reconstruction of paleogeographic conditions of the final late Pleistocene and Holocene in the Middle Yenisei Valley. This research is based on a thorough examination of continuously deposited sediments from the first floodplain terrace of the Berezovka River, employing pedological, malacofaunal, geochemical, and radiocarbon dating analyses. Continuous sedimentation of the first floodplain terrace of the Berezovka River began 13,340+410 calibrated years before present (cal BP), during stabilization of the hydrological regime of the river. Accumulation of basal horizons of gray-blue clay deposits and sandy deposits of channel alluvium occurred 20,830+520 cal BP, and it was caused by floods and freshets on the Yenisei River. During the late Pleistocene, a shift occurred from dry and cold conditions (20,830+520 cal ВР) to a more humid and temperate climate (13,340+410 cal BP). The early Holocene, 8,805+200 cal BP, was marked by a combination of arid and cold climatic conditions. Notably, that era witnessed a rise in the diversity of freshwater mollusk species within the malacofaunal community. During the mid-Holocene (about 5,230+250 cal BP) and the late Holocene period (1,020+220 cal BP), there was an increase in humidity and climate warming, as confirmed by an increase in the number of shells of terrestrial species in the structure of the malacofaunal community. At the end of the late Holocene (220+70 cal BP), the climate became similar to the modern one. Geochemical markers such as Sr/Ba, Cu, Co, Cr, and Zn ratios reveal a transition in climate during the late Pleistocene, from a dry and cold environment to a more humid and warmer one. In the Holocene epoch, the data obtained suggest a change from arid and cold conditions (early Holocene) to the present-day climate, without a distinct indication of the Holocene climatic optimum or the subsequent cooling observed in the neighboring regions.
