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

[04:18822]布克为了了解大陆的演化，研究活跃的碰撞带是必要的。大陆与大陆碰撞的典型例子是印度与欧亚大陆之间的碰撞，欧亚大陆形成了喜马拉雅和青藏高原。这个高原是地球上最引人注目的地形特征之一，也是最不为人所知的地形特征之一。对于其最初的隆升，人们提出了两种机制：(1)印度在亚洲的逆冲下产生了双地壳；(2)亚洲受到了挤压。近10年来青藏高原的进一步抬升是由于青藏高原下岩石圈的剥离和下沉，并被温暖、较轻的软流层所取代。美国华盛顿大学（UW）和加拿大地质调查局（CGS）将与中国地质矿产部（MGMR）、华盛顿大学（UW）和加拿大地质调查局（CGS）合作，在西藏南部开展高分辨率大地电磁剖面。这将补充由MGMR和COCORP领导的美国小组在同一样带进行的地震工作。UW和CGS将进行长周期MT测量，以检查地壳、地幔和软流圈结构。中国将进行较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. ***