Geochemical variations in the Upper Kazanian (Middle Permian) stratotype section, Russia

Abstract

The present paper shows elemental and carbon and strontium isotope composition of the Upper Kazanian (Middle Permian) stratotype section Pechishchi, Russia. A new version of Noinsky’s cycles scheme has been obtained for Martinet and Sougy’s Diagram types of carbonates, with the geochemical indices values changing within marine, evaporate and clastic beds. The δ13Ccarb values vary within interval 0 − +10‰ V-PDB with a mean value 6.2 ‰ V-PDB. The negative excursions of δ13Ccarb values (with amplitudes 2-8 ‰) are assigned as significant land-derived sedimentary inputs. The values of 87Sr/86Sr ratio in the data set of 17 samples change from 0.707267 to 0.707417 (mean value 0. 70734). On standard 87Sr/86Sr curve these values correspond to the interval 273 – 268 Ma.

Earth Science Frontier at Urban Periphery: Geoheritage from the Vicinity of Kazan City, Russia

“…Two geological localities of the Verkhny Uslon District, namely Pechischi and Cheremushki, are well-known as highly important objects for the understanding of the Upper Kazanian (upper Roadian) and Urzhumian (Wordian) deposits of the eastern Russian Platform, as well as for the international stratigraphical correlation developments [33,41,[52][53][54][55][56][57][58]. Detailed stratigraphical, sedimentological, geochemical, paleontological, and palaeogeographical characteristics of these localities are available (see references above), and it would be unreasonable to repeat them.…”