华南石炭纪晚密西西比亚纪有孔虫及其年代地层意义

石炭纪晚密西西比亚纪是联合大陆和大规模冈瓦纳冰川开始形成的关键地质历史时期。有孔虫是密西西比亚纪高精度地层对比的重要工具之一。本项目以华南为研究重点，以不同沉积环境的多个剖面晚密西西比亚纪的地层和有孔虫为研究对象，1）探讨这期间有孔虫的系统分类、演化趋势和时空分布，建立高精度的有孔虫生物地层框架；2）依托谢尔普霍夫阶GSSP候选剖面——贵州罗甸纳庆剖面及辅助剖面，解决界线处牙形刺与有孔虫的精确对比问题，助力这枚“金钉子”落户我国，同时解决浅水相剖面识别谢尔普霍夫阶底界的难题；3）利用有孔虫为华南旋回层沉积提供年代地层框架，力争在晚古生代冰期大规模冰川开始时间和冰期-间冰期循环周期等热点科学问题上有所突破。

Late Mississippian is a critical period in the geological history, when some major geological events happened such as the formation of the Pangaea and the beginning of the large-scale Gondwana glaciation. Foraminifers are significantly useful in high-precision biostratigraphic correlations for Mississippian strata. Based on samples from sections located in different depositional environment in South China, this project will conduct the following researches: 1) to obtain a comprehensive understanding of the systematics, evolution, and the spatial and temporal distribution of late Mississippian foraminifers from South China, and to establish a refined high-resolution zonal scheme of these foraminifers; 2) to investigate the foraminiferal succession of the Visean/Serpukhovian boundary interval in south China and its accurate correlation with conodonts from the Visean/Serpukhovian boundary GSSP candidate section-the Naqing section and other auxiliary sections, and to address the problem of basal Serpukhovian foraminiferal indices in shallow-water sections; 3) to establish chronostratigraphical framework of cyclothems from South China by correlations of transgressive-regressive sequences and foraminiferal zonations, which could contribute to resolutions of debates on the timing of the onset, and the average cycle period of the Late Paleozoic Ice Age.