Upper Precambrian sandstones of platform Bashkortostan: lithogeochemistry and main lines of formation

Main lithogeochemical characteristics of Upper Precambrian sandstones from Kamsk-Belsk aulacogen and Shkapovo-Shikhan Depression are discussed. It is established that among these sandstones arkoses, subarkoses, litharenites and sublitharenites are predominated. Majority of these sandstones are first-cycle rocks and were formed due to direct erosion of crystalline basement of East European Platform. Lithogeochemical peculiarities of Riphean and Vendian sandstones indicate that these rocks were formed in passive and active continental margin conditions.