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| Electrical Structure and Fault Features of Crust and Upper Mantle beneath the Western Margin of the Qinghai-Tibet Plateau： Evidence from the Magnetotelluric Survey along Zhada-Quanshui Lake Profile | |
| 引用本文： | 金胜 叶高峰 魏文博 邓明 景建恩. Electrical Structure and Fault Features of Crust and Upper Mantle beneath the Western Margin of the Qinghai-Tibet Plateau： Evidence from the Magnetotelluric Survey along Zhada-Quanshui Lake Profile[J]. 中国地质大学学报(英文版), 2007, 18(4): 326-333. DOI: 10.1016/S1002-0705(08)60013-8 |
| 作者姓名： | 金胜 叶高峰 魏文博 邓明 景建恩 |
| 作者单位： | [1]Key Laboratory of Geo-detection （China University of Geosciences, Beijing）, Ministry of Education, Beijing 100083, China [2]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China [3]School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China |
| 基金项目： | 国家自然科学基金，Focused Subject Program of Beijing |
| 摘 要： | The magnetotelluric (MT) survey along the Zhada (札达)-Quanshui (泉水) Lake profile on the western margin of the Qinghai (青海)-Tibet plateau shows that the study area is divided into three tectonic provinces by the Yalung Tsangpo and Bangong (班公)-Nujiang (怒江) sutures. From south to north these are the Himalayan terrane, Gangdise terrane, and Qiangtang (羌塘) terrane. For the study area, there are widespread high-conductivity layers in the mid and lower crust, the top layers of which fluctuate intensively. The high-conductivity layer within the Gangdise terrane is deeper than those within the Qiangtang terrane and the Himalaya terrane, and the deepest high-conductivity layer is to the south of the Bangong-Nujiang suture. The top surface of the high-conductivity layer in the south of the Bangong-Nujiang suture is about 20 km lower than that in the north of it. The high-conductivity layer within the Gangdise terrane dips toward north and there are two high-conductivity layers within the crust of the southern Qiangtang terrane. In the upper crust along the profile, there are groups of lateral electrical gradient zones or distortion zones of different scales and occurrence indicating the distribution of faults and sutures along the profile. According to the electrical structure, the structural characteristics and space distribution of the Yalung Tsangpo suture,Bangong-Nujiang suture, and the major faults of Longmucuo (龙木错) and Geerzangbu are inferred. |
| 关 键 词： | 青藏高原 MT 高电导率 地壳 地质学 |
| 收稿时间： | 2007-06-02 |
| 修稿时间： | 2007-09-15 |
Electrical Structure and Fault Features of Crust and Upper Mantle beneath the Western Margin of the Qinghai-Tibet Plateau: Evidence from the Magnetotelluric Survey along Zhada-Quanshui Lake Profile |
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| Jin Sheng,Ye Gaofeng,Wei Wenbo,Deng Ming,Jing Jian'en. Electrical Structure and Fault Features of Crust and Upper Mantle beneath the Western Margin of the Qinghai-Tibet Plateau: Evidence from the Magnetotelluric Survey along Zhada-Quanshui Lake Profile[J]. Journal of China University of Geosciences, 2007, 18(4): 326-333. DOI: 10.1016/S1002-0705(08)60013-8 | |
| Authors: | Jin Sheng Ye Gaofeng Wei Wenbo Deng Ming Jing Jian'en |
| Affiliation: | 1. Key Laboratory of Geo-detection (China University of Geosciences, Beijing), Ministry of Education,Beijing 100083, China 2. State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences, Beijing 100083, China 3. School of Geophysics and Information Technology,China University of Geosciences, Beijing 100083, China |
| Abstract: | The magnetotelluric (MT) survey along the Zhada-Quanshui Lake profile on the western margin of the Qinghai-Tibet plateau shows that the study area is divided into three tectonic provinces by the Yalung Tsangpo and Bangong-Nujiang sutures. From south to north these are the Himalayan terrane, Gangdise terrane, and Qiangtang terrane. For the study area, there are widespread high-conductivity layers in the mid and lower crust, the top layers of which fluctuate intensively. The high-conductivity layer within the Gangdise terrane is deeper than those within the Qiangtang terrane and the Himalaya terrane, and the deepest high-conductivity layer is to the south of the Bangong-Nujiang suture. The top surface of the high-conductivity layer in the south of the Bangong-Nujiang suture is about 20 km lower than that in the north of it. The high-conductivity layer within the Gangdise terrane dips toward north and there are two high-conductivity layers within the crust of the southern Qiangtang terrane. In the upper crust along the profile, there are groups of lateral electrical gradient zones or distortion zones of different scales and occurrence indicating the distribution of faults and sutures along the profile. According to the electrical structure, the structural characteristics and space distribution of the Yalung Tsangpo suture, Bangong-Nujiang suture, and the major faults of Longmucuo and Geerzangbu are inferred. |
| Keywords: | west margin of Qinghai-Tibet plateau MT high-conductivity layers of crust electrical structure structural characteristics of fault. |
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