Depositional environments of the Carboniferous-Permian Taiyuan Formation (southern North China Block) as deduced from trace elements and from carbon and oxygen isotopes

Limestone layers are extensively developed in the continental/ocean transitional Taiyuan Formation. This formation accumulated on southern North China Block. The precise  environmental conditions of Formation still controversial. More information about these topics is presented here basis analysis trace elements (Mo, V, Cd, Cr, U, Th), which can be used to determine characteristics depositional environment, and carbon oxygen isotopes (δ 13 C δ 18 O) limestone samples from Huainan Coal Basin. Samples were taken for purpose cores all levels, obtained a coal-exploration borehole (code P2) It was found that O values show decreasing trend, suggesting gradual rise sea level warm climate. Three negative shifts of δ appear lower, middle an upper layer, accompanied by relative enrichment redox-sensitive (Cd, Mo V). These three thus deduced have been deposited climate with high more terrigenous input than during deposition other layers. redox elemental ratios (V/Cr, Th/U) limestones suggest oxygen-rich salinity.