Formation of Holocene sediments in the lower reach of the Chernaya River (northwest of the Bolshezemelskaya tundra)

The facies dissection of Holocene deposits in the estuary part of the Chernaya River (northwest of the Bolshezemelskaya tundra) was carried out. A geomorphological scheme of the river valley was constructed on the basis of the results of lithofacies analysis of sediments and geomorphological (morphographic and morphometric) study of the relief. The main patterns of the river valley development in the postglacial period were revealed. The degradation of the polar (Ostashkov) ice sheet at the end of the late Neopleistocene and the low position of the territory of the northern part of the Bolshezemelskaya tundra contributed to the formation of a lake-marine terrace. Simultaneously with glacioisostatic compensation and the rise of the territory, the incision of the channel system and the accumulation of sediments of the second floodplain terrace occurred. The ingression of the Pechora Sea in the late Holocene contributed to the accumulation of sediments of the first terrace and floodplain with a complex of estuarine deposits, the formation of which occurred in tidal conditions. Lake, lake-marsh and marsh sediments simultaneously accumulated on the surface of the terraces.