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

9706630 Burchfiel印度-亚洲碰撞带是大陆-大陆碰撞的典型地点，对该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不可能获得的。特别值得关注的是挤压和旋转假说之间的争论，在这种情况下，亚洲地壳块体。亚洲地壳的缩短是通过挤压楔形地壳块体，还是通过旋转辅助这些块体的运动来完成的。这项研究将通过构造和古地磁两种方法来解决这个问题。现场结构和相关运动学研究将允许测试挤压模型，古地磁研究将允许测试旋转研究。这两种假说加在一起可以在中国西南这一关键区域得到检验，并将为解释更多古老的山脉带提供强有力的背景，在那里，构造叠加使这些问题变得更加难以解决。

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.