Structure and depositional history of the Vendian Sylvitsa Group in the western flank of the Central Urals

摘要

A detailed description of sections and a genetic facies analysis has rendered a reconstruction of the depositional environments of the Upper Vendian Sylvitsa Group in the western flank of the Central Urals. The revealed cyclic structure, patterns of distribution of depositional systems, and position of surfaces of facies migration allowed a more comprehensive stratification of the fossiliferous sedimentary succession of the Chernyi Kamen Formation. The identified sequence of the stratigraphic architecture of the Sylvitsa Group formed the basis for reconstructing a depositional history of the Central Urals segment of the late Vendian paleobasin that existed at the eastern margin of the East European Craton. The most fossiliferous and stratigraphically the most complete sections of the Chernyi Kamen Formation are located in the southern part of the Kvarkush-Kamennogorsk Meganticlinorium marking an area of continuous subsidence. The results open up new possibilities for a high-resolution intrabasinal correlation between the Sylvitsa Group and the coeval sedimentary successions in the South Urals, Moscow and Mezen basins.