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

9418822 Booker 为了了解大陆演化，有必要研究活跃的碰撞带。 大陆与大陆碰撞的典型例子是印度和欧亚大陆之间的碰撞，形成了喜马拉雅山和青藏高原。 这个高原是地球上最显眼、也是人们最了解的地形特征之一。 对于其最初的隆升，人们提出了两种机制：（1）印度对亚洲施加了挤压，产生了双层地壳；（2）亚洲受到了压缩。 过去十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，以及其被更温暖、更轻的软流圈所取代。 华盛顿大学 (UW) 和加拿大地质调查局 (CGS) 将与中国地质矿产部 (MGMR) 合作，在西藏南部开展高分辨率大地电磁 (MT) 剖面研究。 这将补充 MGMR 和 COCORP 领导的美国小组沿同一横断面进行的地震工作。 华盛顿大学和 CGS 将进行长期大地电磁测量，以检查地壳、地幔和软流圈结构。 中国将进行更短周期的大地电磁测量，以约束上地壳结构。 ***

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. ***