Collaborative Research: Lithospheric-Scale Dynamics of Active Mountain Building Along the Himalayan-Tibetan Collision Zone

9909362 Chen该项目的总体目标是准确确定喜马拉雅山脉形成期间大陆岩石圈在其整个厚度上如何变形。 私家侦探会在700公里外。与尼泊尔、中国、法国和德国的合作者合作，在喜马拉雅-青藏高原进行长距离、高密度宽频带地震断面调查。 结果将被用来确定三个竞争模型中的哪一个更合适：1）印度岩石圈下推覆西藏几乎没有变形，2）喜马拉雅山是一个序列的逆冲叠加，涉及整个地壳和上地幔，或3）地壳和上地幔都明显缩短，地壳是薄弱的。 该项目将提供在碰撞区关键部分下方深度缺失的关键信息，并将绘制出突出的地壳、莫霍面和上地幔界面的几何学和运动学，这些界面是理解地幔如何与岩石圈部分联系的关键。具体研究对象包括：喜马拉雅前陆的地幔变形--变形有多深;各种逆冲断层表面在深部的形态和逆冲断层是如何工作的;雅鲁藏布江缝合带的结构及其向北的延伸和印度俯冲岩石圈的命运。*

9909362Chen The overall goal of this project is to determine exactly how the continental lithosphere deforms over its entire thickness during the building of the Himalayas. The P.I.s will deploy a unique 700 km. long, high-density broadband seismic transect across the Himalaya-Tibetan Plateau in cooperation with Nepalese, Chinese, French and German collaborators. The results will be used to determine which of three competing models is more appropriate: 1) Indian lithosphere underthrusts Tibet with little deformation, 2)Himalaya is a sequence of thrust stacks that involve the entire crust and uppermost mantle, or 3) Both crust and uppermost mantle shorten appreciably and the crust is weak between them. The project will provide the critical information that is missing at depth beneath key segments of the collision zone, and will map out the geometry and kinematics of prominent crustal, Moho, and upper mantle interfaces that are key for understanding how the mantle is linked to portions of the lithosphere. Specific research targets include: Mantle-involved deformation in the Himalayan foreland - how deep does the deformation go; the configuration of various thrust surfaces at depth and how the thrusts work; and the structure of the Yarlung-Zangpo suture zone its northward extent and the fate of the underthrust Indian lithosphere.***