When did Extrusion of the Tibetan Plateau Initiate and How Much Has Occurred? Geological Investigation of the Western Kunlun Shan, Western China

[9614664]关于亚洲对印度和亚洲碰撞的反应，目前有两种模型。在挤压模式中，西藏西部向印度板块以东的侧向挤压调节了辐合，而在地壳增厚模式中，南北缩短和增厚调节了辐合。活动的喀喇昆仑断裂和阿尔金断裂长期以来被认为是侧向挤压模式断裂的候选者。然而，这些断层上滑动的时间和幅度的不确定性，妨碍了对横向挤压与地壳增厚构造的相对重要性进行定量评估。该项目是一项测绘、地质年代学和古地磁工作，旨在建立这些重要断层的滑动历史。研究结果有望对这些模型在印亚碰撞中的适用性提供定量评价。

9614664 Yin Two models for the response of Asia to the collision between Indian and Asia are current. In the extrusion model, convergence is accommodated by lateral extrusion of western Tibet moving out of the way to the east of the Indian plate, whereas in the crustal thickening model invokes north-south shortening and thickening to accommodate convergence. The active Karakorum and Altyn Tagh faults have long been identified as candidates for the lateral extrusion model faults. However, uncertainly about timing and magnitude of slip on these faults has precluded quantitative evaluation of the relative importance of lateral extrusion vs. crustal thickening tectonics. This project is a mapping, geochronologic and paleomagnetic effort to establish slip history for these important faults. Results are expected to provide a quantitative evaluation of the applicability of these models for the Indo-Asian collision.