Role of glacial and lithodynamic factors in the formation of the sedimentary cover structure of the Great Salma Strait (White sea)

Abstract

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.