Stratigraphy of Organic Carbon Isotope and Associated Events across the Permian/Triassic Boundary in the Dongpan Deep-Water Section in Liuqiao Area, Guangxi, South China

The organic carbon isotope compositions were examined for the first time from a well-preserved deep-water PTB section(Dongpan section) in Liuqiao area,Guangxi.The global correlation comparison is carried out by(organic) carbon isotope stratigraphy between Dongpan section and GSSP at Meishan section in Zhejiang.There are remarkable similarities and differences between the δ~(13)C_(org) trends of both sections.In Dongpan(section),a(remarkable) negative excursion occurs after the onset of 'PTB events',which is similar to Meishan section,and was accompanied by the mass extinction of radiolarian,volcanic activities and sea level fall.The recovery(towards) more enriched δ~(13)C_(org) values at Meishan section occurs in a zone of bed 27,but continued(negative)(δ~(13)C_(org)) values throughout the lower Induan in Dongpan section coincide with the marked recovery lag,which is probably related to continuously adverse conditions in the Early Triassic.