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

基本信息

批准号：
1008760
负责人：
Bradley Hacker
金额：
$ 26.61万
依托单位：
University of California-Santa Barbara
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=1008760&HistoricalAwards=false
关键词：
Collaborative Research suturing process Insight

项目摘要

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.

海洋岩石圈俯冲后大陆碎片的缝合是岩石圈动力学以及地球大陆形成和生长的基本过程。然而，我们对这一基本过程的理解仍然有限。古代缝合线以跨越数千公里的区域结构、沉积和岩石学模式表现出来，并记录了过去板块动力学的证据。缝合过程本身会导致板块动力学发生巨大变化，形成地球上最大的山脉，并通过关闭海洋盆地和抬高地形来改变全球气候动力学。就基本的全球构造过程而言，缝合作用与大洋俯冲和大洋中脊的形成相当，但在地球科学教科书中，除了它的定义和对印度-亚洲碰撞的提及之外，几乎找不到更多的内容。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达。为了实现这一目标，PI建议研究西藏南部和喜马拉雅山北部的印度-亚洲碰撞带（IACZ）。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、古地磁学以及相关过程的数值地球动力学模型。