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

合作研究：缝合过程：印度-亚洲碰撞区的见解

• 批准号: 1007929
• 负责人: Kip Hodges
• 金额: $ 26.29万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1007929&HistoricalAwards=false
• 关键词: Collaborative; Research; suturing; process; Insight

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.

间歇性岩石圈俯冲后的大陆碎片的缝合是岩石圈动力学和地球大陆的塑造和生长的基本过程。但是，我们对这个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结构，沉积和岩石学模式中表现出来，并记录了过去板动力学的证据。 缝合过程本身会导致板动力学的巨大变化，创造地球最大的山带，并通过关闭海洋盆地并提高高地形来改变全球气候动态。就基本和全球的构造过程而言，缝合力与海洋俯冲和中山山脊形成相当，但是在地球科学教科书中几乎没有比其定义和对印度碰撞的提及更多的东西。该项目的主要目的是了解缝合之前，之中和之后的地球动力学过程，以及这些过程如何影响大陆生理学，并在地质记录中表达。为了实现这一目标，PIS建议研究西藏南部和北喜马拉雅北部的印度亚洲碰撞区（IACZ）。 要采用的技术包括结构地质，地层学，地质学，热团学，稳定和放射性同位素地球化学，火成岩和变质岩石学，古磁性以及相关过程的数值地球动力学模型。