目前对古特提斯消亡与新特提斯扩张的时空转换过程及新特提斯洋扩张的细节尚不清楚，青藏高原腹地的羌塘和拉萨等块体被认为是研究该问题的关键地区之一。本申请围绕“特提斯地球动力系统”总体科学目标，拟对羌塘和拉萨等关键块体在晚古生代-中生代的裂解-汇聚过程精细重建。在多年青藏块体构造磁学研究积累的基础上，重点针对现有古地磁数据薄弱点和关键点继续展开工作，补充和完善关键地区、关键时代的关键极位置。通过绘制块体的古地磁视极移曲线和构建数据模型，定量描绘块体裂解-旋转-漂移-聚合的运动轨迹，从运动学角度回答古、新特提斯洋的扩张、俯冲和消亡过程。结合地质和地球物理资料，分析块体的位置变化和演化历史，研究它们与古大陆的亲缘关系，探讨青藏高原古-新特提斯洋时空转换和新特提斯洋扩张历史与过程。该项工作可为实现特提斯地球动力系统重大研究计划总体目标和解决“地球多陆块单向聚合动力学”这一核心科学问题提供定量基础材料。

Largely due to the lack of high-quality paleomagnetic data, the transition phase about the gradually Paleo-Tethys extinction and the Neo-Tethys expansion as well as the details of kinematic process accompanied the open and close of Paleo-Neo Tethys has remained unclear till now. The Qiangtang block and the Lhasa block are considered to be one of the key areas to explore these issues. This project, with the overall scientific goal of “Tethys Earth Dynamic System”, intends to subtly reconstruct the process of rifting-aggregating of main blocks in the Tibtan Plateau (e.g., the Qiangtang and Lhasa blocks) during the late Paleozoic and Mesozoic period. Based on years of tectonic magnetism work we’ve conducted on the major blocks in the Tibet, we will continue to focus on the key points and weakness of the existing paleomagnetic data, complement and improve the critical pole positions of key areas in key time windows. By graphing the Apparent Polar Wander Path (APWP) and modelling, we can not only quantatively describe the process of rifting-drifting-aggregating of these blocks, but also explain the expansion, subduction and extinction of the Paleo-Neo Tethys from the perspective of kinematics. Further, based on geological and geophysical data, we are going to analyze the evolution history of the areas, study their kinship with the ancient continent and discuss the time-space conversion of the Neo-Tethys in the Tibetan Plateau. This work can provide foundational scientific materials for achieving the overall goal of the Tethys Earth Power System Major Research Project and solving the core scientific problem about “universal dynamics of unidirectional aggregation of the Earth's multiple lands”.