底栖大有孔虫灰岩在特提斯区域分布广泛，是该时期特提斯洋环境的重要记录，古新世至始新世是新生代底栖大有孔虫演化最重要的时期，但在东特提斯洋区域，尤其我国藏南地区，底栖大有孔虫在这一时期的演化模式及生物组合与环境变化的相互关系等的研究还较为初步，且期间的古新世/始新世界线及该时期藏南地区的古海洋演化等问题也存在争议。本项目将以底栖大有孔虫的生物地层学为基础，对藏南岗巴-定日-亚东地区的多个古新世至始新世地层剖面进行研究。建立综合生物地层格架的同时，结合对该时期底栖大有孔虫的种群演替及种群内部个体的形态学、生态学的研究，系统恢复底栖大有孔虫的演化模式。同时通过对底栖大有孔虫种群及伴生生物组合特征进行分析，重建研究区的古海洋环境的时空分布特征。并与特提斯区域该时期的沉积进行广泛对比，探讨古新世至始新世东特提斯区域古海洋演化、构造演化对底栖大有孔虫种群的分异、迁徙的影响，反之为地质问题的解决提供证据

Larger benthic foraminifera are important contributors to Tethyan carbonate sediments, and useful tool for reconstruction of paleoenvironment. The Paleocene to Eocene is the thriving period of Larger benthic foraminifera, which experienced important fauna turnover. In eastern Tethys, especially the southern Tibet, further investigation are still needed for researches of the evolution of larger benthic foraminifera and the interaction between biological assemblages and environmental changes during Paleocene to Eocene. In this proposal, we are planning to study different sections of the Paleocene-Eocene strata in the southern Tibet based on biostratigraphic analysis of larger benthic foraminifera and other associated species. Additionally, fauna composition and species morphological analysis will also be taken to reconstruct the evolutional model of larger benthic foraminifera. Moreover, the paleo-oceanic condition during the Paleocene to Eocene in the southern Tibet will also be discussed by ecological, paleoclimatic and paleoenvironmental analysis of larger benthic foraminiferal assemblages and biofacies. Accompany with references in other regions throughout the Tethys, the paleo-oceanic evolution of the southern Tibet and adjacent regions during the Paleocene-Eocene period and its relation with regional tectonic evolution will be discussed, together with the analysis of diversity and migration of larger benthic foraminiferal assemblages.