CORRELATION OF DIFFERENT-FACIES TRIASSIC DEPOSITS OF THE EASTERN URALS AND SIBERIA

Abstract

Some Triassic key sections of Siberia and the eastern Urals are characterized in terms of paleontology. In the northeastern Siberia, these are sequences of the Cape Tsvetkov (the eastern Taimyr Peninsula) and the Ust'-Anabar and Buur-Olenek structural-facies zones. Marine and continental deposits of these sections contain six palynological assemblages of the Induan, Olenekian, late Anisian, Ladinian-early Carnian, Carnian, and early Norian ages. The dating is supported by marine fauna identifications. Analogous palynological assemblages were detected in volcano-sedimentary coastal-marine Triassic sequences recovered by the Tyumen' superdeep borehole and by deep Nikol'skaya-1 borehole in West Siberia. In the eastern Urals, the palynological assemblages of similar composition were found in continental volcano-sedimentary coal-bearing sequences of the Chelyabinsk and Anokhino grabens. This allows correlation of the different-facies Triassic deposits. Distribution patterns of the distinguished spore-pollen and macrofossil plant assemblages are compared for the first time. The correspondence between evolutionary stages of Triassic taphofloras in East Siberia and the eastern Urals is established.