U.S.-China Cooperative Research: Xinjiang Magnetotelluric Transect

中美合作研究：新疆大地电磁断面

• 批准号: 8806009
• 负责人: Gerald Hohmann
• 金额: $ 1.5万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-01 至 1991-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8806009&HistoricalAwards=false
• 关键词: U.S.; China; Cooperative; Research; Xinjiang

This proposal on "Xinjiang Magnetotelluric Transect" between Dr. Stanley H. Ward of the University of Utah and Professor Zhao Jingxiang of the Institute of Geophysical and Geochemical Exploration is jointly sponsored by NSF and the Chinese Ministry of Geology. The investigators propose a magnetotelluric (MT) geophysical survey of a portion of China's Xinjiang Province, the first look at the geoelectric structure of the area directly north of the Tibetan Plateau. The survey will explore a north-south 1000 km line of MT stations (transect) running from the Junggar Basin in the north, across the Tien Shan Range, into the Tarim Basin in the south. The MT method is a passive, deep-sounding exploration method used to map variations in the electrical conductivity of the subsurface. The investigators believe MT is ideally suited for largely unexplored areas such as Xinjiang. The completion of this transect will augment other MT surveys that have been conducted in China. These data should be comparable to data on the Sevier orogenic belt of Nevada and Utah and the Laramide deformation of the Colorado Plateau where compressional tectonic forces similar to those at work in Central Asia were at work in the late mezozoic and early cenozoic. Using the results of transects such as these, it is possible not only to examine crustal structure, but also to recognize zones of conductive volatile fluids or partial melting at depth. Recognition of such zones is necessary for a complete understanding of crustal evolution.

这项由美国犹他大学斯坦利·H·沃德博士和中国地质学会地球物理与化探研究所赵景祥教授共同提出的关于新疆大地电磁断面的提案是由美国国家自然科学基金会和中国地质部共同发起的。研究人员提议对中国所在的新疆部分地区进行大地电磁(MT)地球物理调查，这是首次看到青藏高原正北方地区的地电结构。这次调查将探索一条南北长1000公里的MT站(横断面)线，从北部的准噶尔盆地穿过天山山脉，一直延伸到南部的塔里木盆地。MT方法是一种被动的、深探测的方法，用于绘制地下电导率的变化图。调查人员认为，MT非常适合新疆等基本上未被勘探的地区。该样线的建成将补充已在中国进行的其他大地电磁测量工作。这些数据应该可以与内华达州和犹他州的塞维尔造山带和科罗拉多高原的拉拉米德变形的数据相比较，在中生代晚期和早新生代，类似于中亚的挤压构造力在发挥作用。利用这些横断面的结果，不仅可以检查地壳结构，还可以识别出导电挥发流体或深层部分熔融的区域。认识到这些带对于全面了解地壳演化是必要的。