Showing papers by "Wenkun Qie published in 2020"

Carboniferous conodont zonation of China

Abstract: Carboniferous conodonts from the candidate GSSPs of the four stages Serpukhovian, Moscovian, Kasimovian and Gzhelian in the Naqing and the adjacent sections of South China have been intensely studied in recent decades. The Carboniferous conodont zonation of China is updated based on the conodont material from South China; 39 conodont zones including 11 Tournaisian zones, 4 Visean zones, 3 Serpukhovian zones, 6 Bashkirian zones, 5 Moscovian zones, 5 Kasimovian zones and 5 Gzhelian zones are separated and discussed in detail. Species of the genera Siphonodella, Polygnathus, Protognathodus and Gnathodus dominate the zonation for Early Mississippian (Tournaisian) strata, Pseudognathodus, Lochriea and Gnathodus are most important for the zonation for Middle and Late Mississippian (Visean and Serpukhovian) strata, Declinog-nathodus, Idiognathoides, Neognathodus provide the zonation of early Bashkirian strata and Diplognathodus, Mesogondolella, Idiognathodus and the related genera Swadelina and Streptognathodus provide the zonation for late Bashkirian through the middle and late Pennsylvanian interval. In South China, the Carboniferous conodont zonation is mainly characterized by deep-water conodont biofacies with Siphonodella, Lochriea, Gnathodus, Declinognathodus, Idiognathoides, "Streptognathodus" expansus group, Diplognathodus and Streptognathodus. The updated Carboniferous conodont zonation of China is dominated mainly by cosmopolitan species, which may eventually allow refined global correlation.

Variabilities of carbonate δ 13 C signal in response to the late Paleozoic glaciations, Long’an, South China

Abstract: An integrated study of biostratigraphy, microfacies, and stable carbon isotope stratigraphy was carried out on the late Famennian-early Asselian carbonates of the Long’an section in Guangxi, South China. Stable carbon isotope studies in the Long’an section have revealed four major positive shifts of δ13C values in the Carboniferous strata in South China. The first shift occurred in the Siphonodella dasaibaensia zone in the Tournaisian, with an amplitude of 4.19‰. The second shift occurred near the Visean/Serpukhovian boundary, with an amplitude of 2.63‰. The third shift occurred in the Serpukhovian, with an amplitude of 3.95‰. The fourth shift occurred in the Kasimovian, with an amplitude of 3.69‰. Furthermore, there were several brief positive δ13C shifts during the late Famennian to early Tournaisian. All of these shifts can be well correlated globally, and each corresponds to sea-level regressions in South China and Euro-America, indicating increases in ocean primary productivity and global cooling events. Chronologically, the four major positive excursions of δ13C, together with several brief positive δ13C shifts that were observed during the late Famennian to the early Tournaisian, correspond to the well-accepted Glacial I, II, and III events.