班公湖-怒江缝合带所代表特提斯洋（班怒洋）的构造属性、洋盆规模、关闭时间及闭合后陆内变形量是研究特提斯问题的关键点之一，然而班怒洋的闭合时间至今仍存争议。闭合前后其两侧块体（拉萨和羌塘块体）的运动学特征，尤其是它们的位置变化（绝对位置及相邻块体相对位置的变化），是厘清这一问题的关键。本项目拟将构造古地磁学研究手段与火山岩同位素年代学、岩石磁学及磁倾角浅化机理模拟等方法有机结合，以拉萨块体新识别出的中-晚侏罗世吐卡日组、仁多组沉积岩和接奴群火山岩-沉积岩为具体研究对象，开展精细的古地磁学研究，并比对不同岩性之间由压实作用引起的磁倾角浅化差异，以期获得拉萨块体中-晚侏罗世可靠的古地磁数据。结合前人的研究结果，确定拉萨与羌塘块体中生代的古地理位置和运动学特征，为恢复班怒洋闭合过程、闭合时间以及印度板块碰撞前后该区大地构造演化过程提供定量约束。

The tectonic properties, oceanic basin size, closing time and intracontinental deformation of the Tethyan represent by Bangong-Nujiang suture (BNS) zone are one of the key points in the study of the Tethys problem. However, the closure time of this oceanic basin is still controversial. The kinematic characteristics of the Terranes (Lhasa and Qiangtang terrane) on the sides of BNS, especially the change of their position which include the change of absolute position and relative position of adjacent block are the key to solve this problem. In this project, we will combine the method of paleomagnetism with isotopic chronology, rock magnetism and simulated magnetic inclination shallow to obtain the reliable paleomagnetic data from the Middle-Late Jurassic sedimentary and volcanic rocks (Tukari formation, Renduo formation and Jienu group). Comparing the magnetic inclination differentia between sedimentary and volcanic rocks, the paleomagnetic results could be revised. Our data combine with previous results from Lhasa and Qiangtang terranes, the paleogeographic and kinematic characteristics of this two terrane will be restoration during the Mesozoic. Our results also provide the quantitative constraints on the the closing time of Bangong-nujiang Tethyan, and the tectonic evolution of Lhasa and Qiangtang terranes after the Indian plate collision.