Pre-Paleozoic sandstones of the Polar Urals

We studied and compared the chemical characteristics of Pre-Paleozoic sandstones of the Ochenyrd and Enganepe ridges. The similarity of characteristics of sandstones from Upper Riphean Ochetyvisskaya Formation and from the basal part of Upper Vendian-Lower Cambrian Enganepe Formation allows considering these deposits as facies analogues. In the composition of sandstones of Enganepe Formation we traced a gradual increase of recycled material from metaterrigeneous rocks altered in the weathering crust. We found differences in the conditions and sources of detrital material, which affected the formation of sandstone composition of the basal and upper parts of the section of Enganepe Formation.