INternational DEep Profiling of Tibet and the Himalaya (INDEPTH)-Magnetotelluric Transect

西藏和喜马拉雅山国际深度剖面（INDEPTH）-大地电磁断面

• 批准号: 9418822
• 负责人: John Booker
• 金额: $ 52.79万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-03-01 至 1997-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418822&HistoricalAwards=false
• 关键词: INternational; DEep; Profiling; Tibet; Himalaya

9418822 Booker To understand continental evolution, it is essential to study active collision zones. The type example of a continent-continent collision is between India and Eurasia which has formed the Himalaya and the Tibetan Plateau. This plateau is the most conspicuous and one the most poorly understood topographic features on Earth. Two mechanisms have been proposed for its initial uplift: (1) India has underthrust Asia to produce a double crust and (2) Asia has been compressed. Further uplift in the last 10 MY has been attributed to peeling off and sinking of the lower Tibetan lithosphere and its replacement by warmer, lighter asthenosphere. In collaboration with the Chinese Ministry of Geology and Mineral Resources (MGMR), the University of Washington (UW) and the Canadian Geology Survey (CGS), will carry out a high resolution magnetotelluric (MT) profile in southern Tibet. This will complement seismic work along the same transect by MGMR and a U.S. group lead by COCORP. The UW and CGS will make long period MT measuresments to examine crust, mantle and asthenospheric structure. The Chinese will make shorter period MT measurements to constrain the upper-crustal structure. ***

9418822布克要了解大陆演化，研究活动碰撞带是必不可少的。大陆-大陆碰撞的典型例子是印度和欧亚大陆之间的碰撞，形成了喜马拉雅和青藏高原。这个高原是地球上最显眼、也是最鲜为人知的地形地貌之一。对于其最初的隆升，人们提出了两种机制：(1)印度俯冲亚洲，形成双地壳；(2)亚洲被挤压。过去10年的进一步抬升归因于青藏高原下部岩石圈的剥离和下沉，并被更温暖、更轻的软流圈所取代。与中国地质矿产部(MGMR)、华盛顿大学(UW)和加拿大地质调查局(CGS)合作，将在西藏南部开展高分辨率大地电磁(MT)剖面。这将是对MGMR和以Cocorp为首的一个美国小组沿同一横断面开展地震工作的补充。UW和CGS将进行长周期大地电磁测量，以研究地壳、地幔和软流层结构。中国将进行较短周期的MT测量，以约束上地壳结构。***