Lithological composition of neopleistocene alluvium on the east of the European Subarctic of Russia

A lithological research of alluvial deposits was carried out and identified features of the granulometric and mineral composition of the Chirvino (Likhvin), Rodionovo (Shklov), Sula (Mikulino) and Byzovaya (Leningrad) alluvium. A change in the granulometric composition of alluvial deposits was established, which was associated with their facial affiliation. The sections of fossil alluvium mainly presented its fluvial facies, or, more accurately, the sedimentary shoal deposits, on the whole quite well sorted. The mineral composition of the heavy fraction of alluvial deposits indicates its formation mainly due to the material of the underlying tills, in some cases - the bedrock of the Ural and Timan mountain systems, the Chernyshev ridge, and also the rocks of the near transit, which to a large extent determined the features of the mineral alluvium associations in individual sections, as evidenced by variations in the content of epidote, amphiboles, garnets, pyrite and siderite.