Landscape and climatic environments of sedimentation during the Late Glacial and Holocene in the lower reaches of the Chernaya River (southeast of the Barents Sea region, Nenets Autonomous Okrug)

The article presents the results of micropaleontological studies (palynological and diatom analyses), which are traditional in a comprehensive study of geosystems. A coastal outcrop in the estuary area of the Chernaya River was studied. The boulder loam exposed at the base of the section with a visible thickness of about 10 m is correlated with the Polar (Ostashkov) horizon, which is confirmed by the results of OSL dating. The overlying sediments have diagnostic features of flow-till. The results of palynological study of clay sediments in the roof of the section indicate the existence of a small proglacial lake formed during the degradation of Polar glaciation. Later, the reservoir underwent swamping and transformation into a permafrost hummocky peat massif. Peat formation began in the Early Holocene. The process of peat accumulation is dated at 7180±150 14C BP (IGAN 10839) and 5720±100 14C BP (IGAN 10838), respectively. The studied glacial and lake-bog sediments were part of a supraglacial sedimentary complex, the fabric of which included both freshwater proglacial reservoirs and brackish-water basins formed during ingression. At the same time, some different types of lakes were probably isolated from each other by dead ice or ridges of loose rocks, subsequently preserved or destroyed by erosional alluvial processes.