UPPER VENDIAN NEMAKIT-DALDYNIAN STAGE ON THE SIBERIAN PLATFORM
V.V. Marusin1,2
1Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Keywords: Vendian, Cambrian, General Stratigraphic Scale of Russia, International Chronostratigraphic Chart, small shelly fossils, trace fossils, chemostratigraphy, Siberian Platform
Abstract
A recent revision of the volume and the age of the Nemakit-Daldynian Stage of the Upper Vendian articulated its comprehensive (bio- and chemostratigraphic) characteristic. This stage includes strata ranging from the first appearance of unequivocal anabaritids (approximately 539 Ma) to the base of the Nochoroicyathus sunnaginicus Assemblage Zone of the Lower Cambrian Tommotian Stage (530 Ma). In addition to the characteristic assemblages of small shelly fossils (SSF), this stratigraphic interval is defined by specific changes in the trace fossil assembalges and by variations of carbon isotope composition in carbonates. Using the established criteria, this study evaluates the completeness of the Nemakit-Daldynian Stage in its type locality (western Anabar Uplift) and in other sections of the Siberian Platform (eastern Anabar Uplift, Olenek Uplift, Kharaulakh Uplift, Uchur-Maya Region, Patom Basin, Baikal area, Irkutsk Cis-Sayans Uplift, Biryusa Cis-Sayans Uplift, southern Yenisei Ridge, northern Yenisei Ridge, Turukhansk Uplift, Igarka Uplift, and inner regions of the Platform).
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