Abstract
Research subject. Volcanogenic formations of the Navysh complex of the Ai Formation in the Taratash anticlinorium of the Southern Urals, which have been thought to be Lower Riphean. Results. The U-Pb dating of zircons from metabasalts of the Navysh complex were obtained, reflecting specific characteristics of their age. The isotope parameters of zircons of the К2247 sample divide them into two groups. The first group unites the ancient crystals aged Т1 = 2943 ± 31 and Т2 = 2713 ± 49 Ma, while crystals in the second group belongs to a much age - Т3 = 451.6 ± 9.1 and Т4 = 366.4 ± 6.0 Ma. No Riphean crystals were found in sample К2247. Conclusions. The dates obtained for the supposed Riphean complexes have shown that the Paleozoic magmatism took place not only in the eastern slope of the Urals, but also in the western slope. This process occurred several times.
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