The First Chemostratigraphic Curve of δ13Сorg for the Upper Permian of Verkhoyanie, Northeast Russia, and Its Correlation with the Shangsi Section, South China

A continuous record of the δ13Сorg value covering the interval from the topmost Capitanian Stage of the Middle Permian to the base of the Induan Stage of the Lower Triassic was obtained in Verkhoyanie (Northeast Russia) for the first time. In the Ustupnyi Creek section (South Verkhoyanie), which is well characterized by fossil fauna (zonal species of brachiopods and bivalves in the lower part, bivalves and ammonoids in the upper parts of the section), two negative, relatively weakly expressed excursions in the δ13Сorg value are outlined: the Capitanian-Wuchiapingian (up to –24.7‰) with an amplitude of 1.3‰, and the late Wuchiapingian (up to –25.1‰) with an amplitude of 0.4‰. In general, the δ13Сorg value for the section varies from –22.6‰ (the lower part of the Wuchiapingian Stage) to –25.1‰ (the upper part of the Wuchiapingian Stage). The obtained δ13Сorg value record and the δ13Сcarb value record in South China, the Shangsi section, are compared; the comparison demonstrated satisfactory similarity. Chemostratigraphic correlation of the two sections indicates that the uppermost part of the Maitaia belliformis bivalve zone belongs to the lower Wuchiapingian Stage, rather than to the upper Capitanian, as previously believed.