Provenance and U-Pb Ages of Detrital Zircons from the Sandstones of the Middle Devonian Asyvvozh Formation, Dzhezhimparma Highland, Southern Timan

摘要

Results of U-Pb dating of detrital zircon grains from diamond-bearing sandstones of the Middle Devonian Asyvvozh Formation in the Southern Timan are presented. It was established that the sandstones do not contain zircon grains younger than the Middle Riphean. The datings of 92 zircon grains fall in the interval of 1144 +/- 36 to 3090 +/- 19 Ma, and the difference between the depositional age of the Middle Devonian sandstones and the age of the youngest zircons is around 750 m.y. The main sources of terrigenous material during the deposition of the Asyvvozh sandstones were the crystalline complexes of the ancient basement of the East European Craton (the central regions of Volga-Uralia) and the complexes of accretionary orogens on the margins of Baltica. The presumably Cambrian kimberlites located within the Komi-Permyak and Sysola arches of the basement of the East European Craton could have been the sources of diamonds.