| 青藏高原东北缘至鄂尔多斯地块壳幔电性结构及构造变形研究 |
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| 引用本文： | 韩松, 韩江涛, 刘国兴, 王海燕, 梁宏达. 青藏高原东北缘至鄂尔多斯地块壳幔电性结构及构造变形研究[J]. 地球物理学报, 2016, 59(11): 4126-4138, doi: 10.6038/cjg20161116 |
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| 作者姓名： | 韩松 韩江涛 刘国兴 王海燕 梁宏达 |
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| 作者单位： | 1. 吉林大学 地球探测科学与技术学院, 长春 130026; 2. 国土资源部应用地球物理重点实验室, 长春 130026; 3. 中国地质科学院地质研究所, 国土资源部深部探测与地球动力学重点实验室, 北京 100037; 4. 中国地质大学(北京)地球物理与信息技术学院, 北京 100083 |
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| 基金项目： | 国家专项项目“深部探测技术实验与集成”（SinoProbe-02）和国家自然科学基金项目（41504076）资助. |
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| 摘 要： | 为了获取青藏高原东北缘至鄂尔多斯地块的壳幔电性结构，研究祁连造山带、鄂尔多斯地块及六盘山构造带的构造变形，布设一条甘肃陇西至陕西黄陵的近东西向大地电磁测深剖面，获取了91个大地电磁测深点的响应.经过对全剖面观测资料的数据处理、分析及二维反演，获得了剖面壳幔电性结构模型.研究结果表明：剖面横向可划分为三个区块，分别对应祁连造山带、六盘山构造带与鄂尔多斯地块；祁连造山带东段可能残存沟弧盆体系的构造格架，青藏高原北东向生长可能是在这一先存格架上的叠加与改造；六盘山构造带壳幔结构复杂，以中地壳拆离断层为界，上地壳发育拆离断层系统而下地壳挤压缩短增厚；鄂尔多斯地块成层性较好，地块总体较为稳定，但局部经历了与地幔上涌相关的物质与结构再造.
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| 关 键 词： | 青藏高原东北缘 鄂尔多斯地块 六盘山构造带 大地电磁测深 壳幔电性结构 构造变形 |
| 收稿时间： | 2016-06-27 |
| 修稿时间： | 2016-09-27 |
Crust and upper mantle electrical structure and tectonic deformation of the northeastern margin of the Tibetan Plateau and the adjacent Ordos Block |
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| HAN Song, HAN Jiang-Tao, LIU Guo-Xing, WANG Hai-Yan, LIANG Hong-Da. Crust and upper mantle electrical structure and tectonic deformation of the northeastern margin of the Tibetan Plateau and the adjacent Ordos Block[J]. Chinese Journal of Geophysics (in Chinese), 2016, 59(11): 4126-4138, doi: 10.6038/cjg20161116 |
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| Authors: | HAN Song HAN Jiang-Tao LIU Guo-Xing WANG Hai-Yan LIANG Hong-Da |
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| Affiliation: | 1. Geo-exploration Science and Technology Institute, Jilin University, Changchun 130026, China; 2. Key Laboratory of Applied Geophysics, Ministry of Land and Resources, Changchun 130026, China; 3. Lithosphere Research Center, Institute of Geology, CAGS, Key laboratory of Earthprobe and Geodynamics, CAGS, Beijing 100037, China; 4. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China |
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| Abstract: | In order to obtain the crust and upper mantle electrical structure of the northeastern margin of the Tibetan Plateau and the adjacent Ordos Block and to further study the tectonic style and deformation of the survey area, a magnetotelluric (MT) sounding profile has been completed. The profile contains 91 sites and goes approximately east-westward from Longxi county, Gansu to Huangling county, Shanxi. Dimensionality analysis demonstrated that the MT data can be interpreted using two-dimensional (2D) approaches. 2D inversions were carried out after data processing, qualitative analysis and strike analysis. The final resistivity model derived from the inversions revealed the crust and upper mantle electrical structures along the profile. According to the electrical structures, the profile can be divided into three tectonic units:the North Qilian Orogenic Belt, the Liupanshan Belt and the Ordos Block, which is consistent with the regional geology settings. The electrical structure of North Qilian Orogenic Belt reveals that the growth of the Tibetan Plateau is a tectonic superimposing and reforming process on the existing Trench-Arc-Basin system. The structure of the crust and upper mantle of Liupanshan Belt is complicated; The Ordos Block is characterized by the four-layer electrical structures with resistive upper crust and high conductive layer(HCL). The interior of the Ordos Block is stable while the southern part experienced distinct material and structural reconstruction associated with the upwelling of the upper mantle. |
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| Keywords: | Northeastern margin of the Tibetan Plateau Ordos Block Liupanshan Belt Magnetotelluric Crust and upper mantle electrical structure Tectonic deformation |
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