The relative sea level changes and aeolianprocesses on the Eastern coast of the White Sea (Gorlo Strait) during the Late Glacial and Holocene (based on studies of Lake SrednyayaTret )

Abstract

Abstract. Geomorphological, ground penetration radar profiling and paleolimnological investigations were carried out in the Lake SrednyayaTret (66.014009 N, 41.086294 E; 7.3 m ASL). Bottom sediments from the three boreholes were studied. Lithologostratigraphic description, grain-size and diatom analyses were carried out, loss on ignition, Corg/Nogr was determined. Radiocarbon ages were obtained from the lower horizons of post-glacial sediments. Signs of Late Glacial transgression (earlier ~12.1 kyr. cal. BP) and Early Holocene regression (started between ~12.1 and ~10.3 kyr. cal. BP) were determined. The next filling of the lake basin can be compared with the Middle Holocene transgression. At the same time sea waters did not penetrate into the lake basin. The beginning of this stage was apparently accompanied by intensification of coastal aeolian processes.