中二叠世（卡匹敦期）生物灭绝事件后广西地区吴家坪期生物礁的复苏与重建——延迟及过程研究

作为古生代型向中生代-现代型生态系统演化的起点，中二叠世（卡匹敦期）生物灭绝事件前后生物礁的灭绝与复苏对于我们了解该时期的生态系统演化有着重要的意义。作为二叠纪末生物大绝灭事件的第一幕，中二叠世（卡匹敦期）生物灭绝事件对生物礁生态系统造成了严重损害。与三叠纪相比，灾后吴家坪期的生物礁复苏过程还缺乏研究。桂中地区来宾铁桥剖面上二叠统吴家坪组中，保存有出露完整，且具有良好地层学和地球化学研究基础的吴家坪期生物礁。本项目拟结合牙形石地层学，碳同位素曲线，使用露头酸蚀面以及岩石薄片进行定量古生态和定量碳酸盐岩微相分析，同时结合生物礁的三维形态分析，在种属级的分类学水平上重建该时期造礁生物的群落演替，复原生物礁的生长过程，以期进一步细化生物礁复苏过程的时间节点，以及与其他重要地质事件之间的耦合关系。

As the initial stage of the changeover from Paleozoic fauna to Mesozoic-Modern fauna, the reef ecosystem's demise and recovery before and after the Middle Permian (Capitanian) mass extinction are significant for the understanding of the ecosystem evolution. The Middle Permian (Capitanian) mass extinction was the first phase of the End-Permian Mass Extinction (EPME). It caused serious damage to the reef ecosystem. However, the understanding of the reef recovery process in Wuchiapingian following the Middle Permian (Capitanian) mass extinction is scarce comparing to the well-studied Triassic recovery after the EPME. The Tieqiao section of Laibin City in the central area of Guangxi, China, has well-preserved Wuchiapingian reefs. As an auxiliary section for the G-LB GSSP, the Tieqiao section has comprehensive biostratigraphic and geochemical references across the Capitanian and Wuchiapingian. This project will apply quantitative palaeoecological analysis and quantitative carbonate microfacies analysis, of the genus or even species level, on thin sections and acid-etched observation windows of the outcrop, combining conodont biostratigraphy, carbonate carbon isotope curves, and three-dimensional morphological analysis of the reef bodies to recover the succession of reef communities, and the process of reef growth in Wuchiapingian. This project aims to refine the time sequence of the Wuchiapingian reef recovery and its possible coupling with critical geological events within this time interval.