U-shaped and V-shaped palleovalleys and paleodepressions are identified on multifrequency seismic data in near-surface section (NSS) within three study areas in Vostochno-Prinovozemelsky area. Valleys of the Late Cretaceous and Quaternary ages and of different genesis are found in the first area of study. The palleovalleys of the Late Cretaceous age are V-shaped and U-shaped by its characteristic morphological properties and are likely formed as a result of the rivers erosional activity. Burried valleys filled with Quaternary glacial sediments are similar to U-shaped paleovalleys, genesis of which is usually connected to glacial plucking in the Late Quaternary glaciation. The tunnel valleys of Quaternary age result from impact of ice sheet existing to the east of the Novaya Zemlya archipelago in the Late Quaternary were revealed in the second study area. In contrast to the first two sites, isometric depressions of Quaternary age and controversial genesis were revealed in the third one. The direction of the identified paleovalleys in some cases coincides with the submarine valleys indicated on the USSR Northern Seas submarine valleys map [Lastochkin, 1977] and the Kara Sea geomorphological map [Miroshnikov et al., 2021].
New data on the bottom relief in the waters adjacent to the Belomorskaya Biological Station of Moscow State University (Kandalaksha Bay), obtained with the help of a multipath echo sounder (MBE), allowed us to study the bottom relief in detail and clarify the structure of Quaternary sediments in this area, significantly detailing the previously obtained data of continuous seismoacoustic profi ling (CSP). In the western part of the studied water area, the de Geer moraines were first identifi ed in a complex of glacial deposits, which were formed during the retreat of the glacier in the late Pleistocene in an easterly direction towards the modern deep-water part of the White Sea. In the deep-water part of the water area, according to the data of the MBE and CSP, sediments were studied, the genesis of which is due to the intensive manifestation of gravitational processes at the end of the Late Pleistocene — Holocene. The new data obtained may indicate the existence of “dead” ice in the Belomorskaya Depression.
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