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Highly variable sediment deposition in Lake Imandra, NW Russia, since the Late Pleistocene
Author(s) -
Lenz Matthias,
Lebas Elodie,
Lenz Marlene M.,
Fedorov Grigory,
Gromig Raphael,
Kolka Vasili,
Krastel Sebastian,
Leicher Niklas,
Melles Martin,
Wagner Bernd
Publication year - 2022
Publication title -
journal of quaternary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.142
H-Index - 94
eISSN - 1099-1417
pISSN - 0267-8179
DOI - 10.1002/jqs.3353
Subject(s) - geology , glacial period , pleistocene , sediment , sedimentary depositional environment , deposition (geology) , marine isotope stage , geomorphology , holocene , paleontology , structural basin , quaternary , glacier , geochemistry , interglacial
To understand the dynamics of sediment deposition and the potential influences of complex current systems in large lakes, Lake Imandra (Kola Peninsula) has been investigated. Seismic and echo‐sounder data of the central part of Bolshaya Imandra reveal the sediment architecture in unprecedented detail. In addition, the sediment core data indicate highly variable depositional processes since the Late Pleistocene. The complex morphology of the lacustrine basin favoured accumulation of sediment in depressions, where they were preserved from erosion. Three main stratigraphic units (SU I–III) were identified above the acoustic basement. The oldest SU III is best preserved along a tectonic trench and interpreted as glacial deposits partly eroded by the Scandinavian Ice Sheet during Marine Isotope Stage (MIS) 2. The overlying SU II deposits are regarded as a till related to MIS 2 glaciation. The youngest SU I represents glaciofluvial, glaciolacustrine and lacustrine sediment deposited after ice retreat. As the north–south‐trending main axis of Bolshaya Imandra runs parallel to the predominant wind direction, the basin is subject to strong wind‐induced surficial currents and compensatory subsurface currents. These currents occur in water depth of 0–15 and deeper than 30 m, respectively, and their velocity prevents sediment accumulation.