Collaborative Research: The suturing process: Insight from the India-Asia collision zone

随着大洋岩石圈的俯冲作用，大陆碎片的缝合是岩石圈动力学和地球形成和生长的一个基本过程。年代的大陆。然而，我们对这一基本过程的理解仍然有限。古老的缝合线在数千公里的区域构造、沉积和岩石学模式中表现出来，并记录了过去板块动力学的证据。缝合过程本身导致了板块动力学的剧烈变化，创造了地球？美国最大的山带，并通过关闭海洋盆地和抬高高地形改变全球气候动力学。就基本的全球构造过程而言，缝合与海洋俯冲和洋中脊形成是同等重要的，但在地球科学教科书中，除了它的定义和对印度大陆的参考外，几乎找不到更多的内容。亚洲碰撞。该项目的主要目的是了解缝合之前、期间和之后的地球动力学过程，以及这些过程如何影响大陆地貌并在地质记录中表现出来。为了实现这一目标，ppi提议研究印度？亚洲碰撞带（IACZ）位于西藏南部和喜马拉雅北部。所采用的技术包括构造地质学、地层学、地质年代学、热年代学、稳定和放射性同位素地球化学、火成岩和变质岩石学、古地磁以及相关过程的数值地球动力学模拟。

The suturing of continental fragments following the subduction of intervening oceanic lithosphere is a fundamental process in lithospheric dynamics and the shaping and growth of Earth?s continents. However, our understanding of this fundamental process remains limited. Ancient sutures manifest themselves in regional structural, sedimentary, and petrologic patterns across thousands of kilometers, and record evidence of past plate dynamics. The suturing process itself results in drastic changes in plate dynamics, creates Earth?s largest mountain belts, and changes global climate dynamics by closing ocean basins and raising high topography. In terms of a fundamental and global tectonic process, suturing is on par with oceanic subduction and mid-ocean ridge formation, yet little more can be found in Earth-science textbooks than its definition and passing reference to the India?Asia collision. The primary aims of this project are to understand the geodynamic processes before, during, and after suturing, and how these processes impact continental physiography and are expressed in the geological record. To achieve this goal, the PIs propose to study the India?Asia collision zone (IACZ) in southern Tibet and the northern Himalaya. Techniques to be employed include structural geology, stratigraphy, geochronology, thermochronology, stable and radiogenic isotope geochemistry, igneous and metamorphic petrology, paleomagnetism, and numerical geodynamical modeling of the associated processes.