The Proterozoic Pogor'uy Formation of Yenisei Ridge: Age and Provenance Sources According to U/Pb Dating of Detrital Zircons

摘要

The results of U-Pb-isotopic dating of detrital zircons from sandstones of the Proterozoic Pogor'uy Formation, occurring to the north and south of the East Angara block of Yenisei Ridge, are presented. The sandstones of the northern part of the East Angara block are dominated by Archean and Paleoproterozoic populations of detrital zircons, while the samples from the southern part of the East Angara block have been revealed up to 25% of Mesoproterozoic age grains. The detrital zircon ages allow limiting the maximum sedimentary age of the Pogor'uy Fm. and the entire interval of its formation to 1.2-0.9 Ga. The paleogeographic features of the Pogor'uy Fm. deposition in the context of the existing opinions on the location of Siberia within the Rodinia supercontinent were examined.