U–Th–Pb (LA-ICP-MS) Isotopic Age of Detrital Zircon from Sandstones of the Burzyan Group (Yamantau Anticlinorium, Southern Urals)

The U–Th–Pb isotope age of detrital zircon populations from sandstones of the Bol’shoi Inzer and Yusha formations of the Burzyan Group (Lower Riphean) of the Yamantau Anticlinorium in the Southern Urals was analyzed. The presence of grains supplied to the sedimentation area from proximal and distal sources was demonstrated. The former likely included the Taratash Complex/Orogen and the Bak 1 complex of the Bakaly granitoid block of the Volga–Ural region, or rock associations similar in age and composition from other regions. The latter include the Volga–Don, Svecofennian, East Sarmatian, and other Early Proterozoic orogens of the East European Craton (Baltica). Considering the intracratonic nature of the Early Riphean sedimentation basin, it has been suggested that some of the detrital material could be delivered from non-Baltica/Siberian sources. Maximum sedimentation age of the Bol’shoi Inzer and Yusha formations has been established. The age of the Bol’shoi Inzer Formation is estimated at 1805 ± 30 Ma (according to the YSG algorithm) and 1870 Ma (according to the YPP algorithm). The Yusha Formation is characterized by the maximum sedimentation age of 1798 ± 10 and 1890 Ma, respectively.