REGIONAL STRATIGRAPHIC SCHEME OF THE UPPER AND FINAL RIPHEAN AND VENDIAN DEPOSITS OF THE SOUTHERN URALS (PROJECT 2022)

Abstract

The need to correct individual stratigraphic levels of the Regional Stratigraphic Scheme of the Upper Precambrian deposits of the Urals, existing since 1993, is due to the receipt of new data from lithological-stratigraphic, geotectonic and isotope-geochronological studies of the Upper Precambrian of the Southern Urals. Significant changes and clarifications in the stratigraphy of the Upper Precambrian formations of the region occurred in the Upper Riphean and Vendian of the Bashkir meganticlinorium in the Southern Urals, where the sections stratotypical for the Riphean and reference for the Vendian are located.
 The results of dating igneous (primarily volcanic) rocks in the Riphean by modern methods made it possible to refine the geochronological basis of the Ural and General Stratigraphic Scale of the Upper Proterozoic of Russia and identify a new event level: the final Riphean (Arshinian), corresponding to the Arshinian series. Changes and clarifications to the correlation of local stratigraphic sections of the Upper and Final Riphean and Vendian of the Southern Urals are reflected in the draft scheme.