First Results Of Isotopic Dating Of Detrital Zirconsfrom The Clastic Rocks Of The Pre-uralides-timanidesrncomplexes: Contribution In The Late Precambrian Stratigraphyrnof The Enganepe Uplift, Western Polar Urals

摘要

The upper horizons of the Earth's crust in the eastern and northeastern framing of the East European platform consist of two units. The upper unit is made up of Late Precambrian and younger (mainly sedimentary) complexes; the lower unit consists of Late Precambrian complexes termed in total as Pre-Uralides-Timanides . The Pre-Uralides-Timanides form uplifts and anticlinoriums extending as an uninterrupted chain along the western slope of the Urals. They are also exposed at Timan and the Kanin Nos peninsula. Age analogs of the Pre-Uralides-Timanides complexes occur as fragments on Kildin Island, in the Rybachii, Srednii, and Varanger peninsulas, on Paikhoi (Amderma region) and Vaigach Island, and in the southern part of the Novaya Zemlya archipelago. These complexes were recovered by several boreholes in the Pechora plate and, according to geophysical data, are traceable in the Barents Sea shelf .