New Data on the Structure of the Quaternary Cover of the Kandalaksha Bay Based on High-Resolution Seismic Profiling Materials

Abstract

The article examines the features of the transition zone from the deep-water to the shallow-water part of the Kandalaksha Bay, which is represented by a ridge of heterogeneous (structural, glacial, and water-glacial) origin. The materials are based on new data obtained through continuous seismic-acoustic profiling (CSP). Multi-channel high-frequency modifications of seismic equipment were used. This allowed to execute a more detailed seismic-stratigraphic division of the thicknesses of subglacial (glacio-lacustrine and glacio-marine) and marine nepheloid deposits, identification of ice-proximal outwash fans, which largely shaped the relief of the studied ridge. The wide development of modern geodynamic movements is shown, significantly affecting the character of the seabed relief, and accompanying gravitational processes. The obtained materials allow for a substantial detailing of the paleogeographic conditions in the Late Pleistocene-Holocene during the transition from glacial sedimentation to marine.

Keywords:

the White Sea, the Kandalaksha Bay, Seismoacoustic Profiling, Glacial Deposits, Glacio-lacustrine and Glacio-marine Sediments, Modern Geodynamic movements, Gravitational Processes