Reconstruction of Late glacial conditions of exogenous landscape development in Central Kamchatka based on pollen analysis
https://doi.org/10.31857/S0435428121040076
Abstract
The paper presents the results of pollen analysis of lacustrine and subaerial deposits of the Kamplen section in the Kliuchevskoe Lake shoreline cliff in the Central Kamchatka depression (CKD). The obtained materials for the first time allowed to reconstruct in detail the conditions of landscape formation in CKD in the Late Pleni-Glacial, Late Glacial and transition to the Holocene, extending the paleogeographic record, developed for the Holocene of Kamchatka. It was found that after 18,000 BP, under relatively cold climate conditions in the paleo-lake watershed, which probably existed in the CKD during the entire last glaciation (MIS 2) up to the early Holocene, open landscapes with predominant herbaceous-grass communities were prevalent. Presence of boreal tree and warm-water aquatic plants pollen indicated the limitation of the alpine glaciation in te area. During 15–13 thousand BP the climate cooled, vegetation cover of the territory became sparser, but the change did not lead to extension of the alpine glaciation. After 13,000 BP, climate warming with gradual glacial degradation led to the expansion of larch forests in the paleo-lake watershed. Drainage of the lake about 11.5 ka BP and the beginning of accumulation of subaerial deposits in the studied section approximately correspond to the lower boundary of the Holocene.
Supporting agencies: The geomorphological study was funded by Megagrant project (agreement № 075-15-2021-599). The pollen analysis was funded by State Task No. 0148-2019-0005, Institute of Geography RAS. The authors thank O. K. Borisova for her help in writing this article, as well as the reviewers for their valuable comments and ideas on presenting the results of the study.
About the Authors
E. O. Mukhametshina
Institute of Geography RAS
Russian Federation
Russian Federation
Moscow
E. A. Zelenin
Institute of Geology RAS
Russian Federation
Russian Federation
Moscow
I. F. Pendea
Lakehead University
Canada
Canada
Orillia
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Review
For citations:
Mukhametshina E.O., Zelenin E.A., Pendea I.F. Reconstruction of Late glacial conditions of exogenous landscape development in Central Kamchatka based on pollen analysis. Geomorfologiya. 2021;52(4):53–63. (In Russ.) https://doi.org/10.31857/S0435428121040076
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