The first results of The first results of U-Pb (LA-ICP-MS) dating of detrital zircons from sandstones of the Staropetrovo Formation of the Vendian Volga-Uralian sedimentary basin and potential sources of zircon clustersU-Pb (LA-ICP-MS) dating of detrital zircons from sandstones of the Staropetrovo Formation of the Vendian Volga-Uralian sedimentary basin and potential sources of zircon clusters

For the first time, information on the age of rocks – sources of zircon clastics for deposits of the Staropetrovo Formation of the Vendian Volga-Uralian sedimentary basin was obtained. As a result of U-Pb (LAICP-MS) dating of detrital zircons from sandstones of the Staropetrovo Formation in the well Krasnousolsk, located in the Pre-Uralian marginal trough, a wide time range of zircon clastic ages was obtained: from the Archean – 3247 million years to the Vendian – 577 million years. Features of the distribution of age populations of zircons from sandstones of the Staropetrovo Formation indicated the influx of detrital material into the Volga-Uralian basin mainly from local feeding provinces. The source of zircons of the most ancient (1831–2507 million years and 2660–2944 million years) population for sandstones of the Staropetrovo Formation is assumed to be the Archean-Paleoproterozoic formations of the Taratash metamorphic complex of the Southern Urals and crystalline rocks of the basement of the Volga-Uralian area. For detrital zircons with ages of 1472–1720 Ma, 1044–1390 Ma, and 653–736 Ma, corresponding to the early, middle, and final Riphean, the intrusive and volcanic formations of the Navysh, Mashak, and Igonino igneous complexes of the Riphean in the Southern Urals, which have modern isotopic datings for zircon and baddeleyite, and the basalts of the Aktanysh (well 203 Menzelino-Aktanysh) and Kipchak (well 1 Kipchak) volcanic complexes of the Volga-Ural region are considered as potential sources of zircon clastics, as well as the basalts of the Aktanysh (well 203 Menzelino-Aktanysh) and Kipchak (well 1 Kipchak) volcanic complexes of the Volga-Uralian area. In local feeding provinces, zircon sources with ages of 851–964 Ma and 603–643 Ma have not been established, which is most likely due to insufficient isotopegeochronological study of sedimentary and igneous complexes of the Precambrian of the East-European platform and its folded frame. Among the Precambrian formations, a special place is occupied by Vendian deposits, to which numerous manifestations of oil and gas are confined in the Volga-Uralian area, which makes Vendian deposits an attractive object for hydrocarbon exploration.

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