COLLABORATIVE RESEARCH: Assessing the Style, Evolution of Large-Magnitude, Intracontinental Deformation, and the Role of Extrusion Tectonics, Eastern Himalayan Syntaxis, Yunnan

印度-亚洲碰撞带是大陆-大陆碰撞的典型区域，对该碰撞带的研究揭示了这种碰撞的构造过程，这在更古老的碰撞系统中是无法得到的。特别值得关注的是挤压和旋转假说之间的争议，在这种情况下，亚洲地壳的块。亚洲地壳的缩短是由楔状地壳块的挤压完成的，还是由这些块的旋转辅助运动完成的？本研究将通过构造和古地磁两种方法来解决这一问题。磁场结构和相关的运动学研究将允许对挤压模型进行测试，古地磁研究将允许对旋转研究进行测试。这两种假设可以在中国西南这个关键地区进行检验，并将为解释更古老的山带提供强有力的背景，在这些山带中，构造叠印使这些问题更加难以解决。

9706630 Burchfiel The Indian-Asian collision zone is the type locality of a continent-continent collision, and studies of this zone reveal the tectonic processes of such collisions that are not obtainable in more ancient collision systems. Of particular concern is the controversy between the hypotheses of extrusion and rotation, in this case of blocks of Asian crust . Is the shortening of the Asian crust accomplished by extrusion of wedge-shaped blocks of crust, or by rotation-aided movement of these blocks. This study will address this issue by both structural and paleomagnetic approaches. The field structural and associated kinematic studies will allow testing of the extrusion models, and the paleomagnetic studies will allow testing of the rotational studies. Together both hypotheses can be tested for this critical region of southwest China, and will provide a strong context for the interpretation of more ancient mountain belts where structural overprinting have made these questions much more difficult to address.