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

[909362] chen这个项目的总体目标是精确地确定在喜马拉雅山脉形成期间大陆岩石圈在其整个厚度上是如何变形的。P.I.s将与尼泊尔、中国、法国和德国的合作者合作，在喜马拉雅-青藏高原部署一条独特的700公里长的高密度宽带地震样带。研究结果将用于确定三种相互竞争的模型中哪一种更合适：1)印度岩石圈向西藏下冲，变形很小；2)喜马拉雅是一个包含整个地壳和上地幔的逆冲叠层序列；或3)地壳和上地幔都明显缩短，两者之间的地壳较弱。该项目将提供碰撞带关键部分以下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形状和运动学，这是了解地幔如何与岩石圈部分相连的关键。具体研究目标包括：喜马拉雅前陆的地幔变形——变形深度；不同深度冲断面的构造和冲断的工作原理；雅鲁藏布缝合带的构造、向北延伸以及逆冲下印度岩石圈的命运

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.***