Three-dimensional electrical resistivity structure beneath the Cuonadong dome in the Northern Himalayas revealed by magnetotelluric data and its implication
文献类型：期刊论文
| 作者 | Xue, Shuai1; Lu, Zhanwu1; Li, Wenhui1; Liang, Hongda2; Wang, Guangwen1; Wang, Haiyan1; Li, Hongqiang3; Li, Xin4 |
| 刊名 | SCIENCE CHINA-EARTH SCIENCES
 |
| 出版日期 | 2022-06-14 |
| 页码 | 16 |
| 关键词 | Cuonadong dome Magnetotelluric method North Himalayan gneiss domes Magmatic diapirism Partial melting Extension |
| ISSN号 | 1674-7313 |
| DOI | 10.1007/s11430-021-9900-y |
| 英文摘要 | The North Himalayan gneiss domes (NHGD), as one of the extensional structures widely distributed across the southern Tibetan Plateau, are an important window for studying post-collisional diastrophism and magmation as well as polymetallic mineralization. However, the deep mechanism for the formation of NHGD remains controversial. The magneto-telluric (MT) method was adopted to study the deep structure of the Cuonadong dome in the Northern Himalayas. The characteristics of the dome were explored by using the MT sounding curves and phase tensors. Three-dimensional (3D) MT inversion was performed to determine the electrical resistivity structure beneath the Cuonadong dome. The preferred 3D electrical resistivity model shows that an obvious low-resistivity anomaly develops beneath the Cuonadong dome which is overlaid by a high-resistivity body and surrounded by an apparent subcircular zone of low-resistivity anomalies. The integrated conductivity (longitudinal conductance) from depths of 1-20 km indicates that the average longitudinal conductance at the core of the Cuonadong dome is about 10,000 S. The high-conductivity anomaly at the core is found to be analogous to that of lava, mainly resulting from the crustal partial melting, and the estimated melt content is 11.0-17.3%. The high conductance surrounding the dome reaches 20,000 S on average, which is mainly attributed to saline fluids. MT results in this study support that the Cuonadong dome experienced magmatic diapirism. Taken together with previous geological and geochemical studies, we suggest that under the east-west (E-W) extensional tectonic setting in southern Tibet, deep crustal partial melting constantly accumulated beneath the dome, and therefore the magmatic diapirism resulted in the formation of the Cuonadong dome. In addition, the MT results also indicate that the development of the Cuonadong dome provides abundant mineralizing fluids and the space for migration of metallogenic fluids for (rare-metal) polymetallic mineralization. |
| WOS关键词 | SOUTHERN TIBET ; TECTONIC EVOLUTION ; GNEISS DOME ; CRUSTAL DEFORMATION ; COLLISION ZONE ; LEUKOGRANITE ; LONGMENSHAN ; INVERSION ; INSIGHTS ; ANATEXIS |
| 资助项目 | National Natural Science Foundation of China[91962109] ; National Natural Science Foundation of China[42174094] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0701] ; Fund of Chinese Geological Survey[DD20190016] ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences[J2015] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000812467100001 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Fund of Chinese Geological Survey ; Fund of Chinese Geological Survey ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Fund of Chinese Geological Survey ; Fund of Chinese Geological Survey ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Fund of Chinese Geological Survey ; Fund of Chinese Geological Survey ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Fund of Chinese Geological Survey ; Fund of Chinese Geological Survey ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences ; Basic Scientific Research Fund of the Institute of Geology, Chinese Academy of Geological Sciences |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/106100]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Lu, Zhanwu |
| 作者单位 | 1.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing 100037, Peoples R China 2.Chinese Acad Geol Sci, Inst Geophys & Geochem Explorat, Langfang 065000, Peoples R China 3.Chinese Acad Geol Sci, Beijing 100037, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xue, Shuai,Lu, Zhanwu,Li, Wenhui,et al. Three-dimensional electrical resistivity structure beneath the Cuonadong dome in the Northern Himalayas revealed by magnetotelluric data and its implication[J]. SCIENCE CHINA-EARTH SCIENCES,2022:16. |
| APA | Xue, Shuai.,Lu, Zhanwu.,Li, Wenhui.,Liang, Hongda.,Wang, Guangwen.,...&Li, Xin.(2022).Three-dimensional electrical resistivity structure beneath the Cuonadong dome in the Northern Himalayas revealed by magnetotelluric data and its implication.SCIENCE CHINA-EARTH SCIENCES,16. |
| MLA | Xue, Shuai,et al."Three-dimensional electrical resistivity structure beneath the Cuonadong dome in the Northern Himalayas revealed by magnetotelluric data and its implication".SCIENCE CHINA-EARTH SCIENCES (2022):16. |
入库方式： OAI收割
来源：地质与地球物理研究所
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