Institutional Repository of Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences
| Magnetotelluric Evidence for Lithospheric Alteration Beneath the Wuyi-Yunkai Orogen: Implications for Thermal Structure of South China | |
| Cheng, Yuanzhi1; Hu, Xiangyun2; Han, Bo3; Li, Yiman1; Kong, Yanlong1; Tang, Ji4 | |
| 2022-11-01 | |
| Source Publication | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| Volume | 23Issue:11Pages:17 |
| Abstract | The Wuyi-Yunkai Orogen experienced a polyphase tectonomagmatism and is a key region for deciphering the alteration and thermal structure of the South China Block lithosphere. Herein, an electrical resistivity model of the lithosphere is presented via the three-dimensional inversion of broadband (0.003-3600 s) magnetotelluric (MT) data collected along a 380-km-long profile comprising 62 MT sites across the Wuyi-Yunkai Orogen, and the robustness of this model is critically evaluated through a series of sensitivity tests. The resistivity model reveals that the upper crust of the Cathaysia Block and the Wuyi-Yunkai Orogen is dominated by high-resistivity sedimentary cover interposed with low-resistivity features, mainly along fault zones. High-resistivity bodies and strong conductors in the upper crust are interpreted as magmatic rocks and tectonic melanges, respectively. Another feature of this resistivity model is the presence of zones featuring enhanced electrical conductivity (<30 omega m) extending from the lower crust to the upper mantle beneath the Wuyi-Yunkai Orogen. The conductors in the lower crust are attributed to saline fluids from either the dehydration of the subducting Paleo-Pacific slab or the regional metamorphism-induced dehydration of sandy argillaceous rocks. In contrast, the conductors in the upper mantle are attributed to 4%-7% partial melt, which corresponds to the analyses of mantle xenoliths in South China. These conductors in the upper crust and upper mantle supply volatiles and heat to shallow geothermal systems. This work ultimately shows that the lithospheric thinning of South China is controlled mainly by mantle upwelling caused by the retreat of the subducting Paleo-Pacific slab. |
| Keyword | South China Wuyi-Yunkai Orogen magnetotelluric lithospheric alteration thermal structure |
| DOI | 10.1029/2022GC010456 |
| Funding Organization | National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| WOS Keyword | CATHAYSIA BLOCK ; ELECTRICAL-CONDUCTIVITY ; TECTONIC EVOLUTION ; SHIWANDASHAN BASIN ; CONTINENTAL CHINA ; GEOTHERMAL-FIELD ; MANTLE ; FLUID ; CONSTRAINTS ; MAGMATISM |
| Language | 英语 |
| Funding Project | National Key Research and Development Project of China[2019YFC0604901] ; National Natural Science Foundation of China[42004060] ; National Natural Science Foundation of China[41630317] |
| Funding Organization | National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Key Research and Development Project of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000878683400001 |
| Publisher | AMER GEOPHYSICAL UNION |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/107709 |
| Collection | 页岩气与地质工程院重点实验室 |
| Corresponding Author | Cheng, Yuanzhi; Hu, Xiangyun |
| Affiliation | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing, Peoples R China 2.China Univ Geosci, Inst Geophys & Geomat, Wuhan, Peoples R China 3.China Univ Geosci, Inst Geol Survey, Wuhan, Peoples R China 4.China Earthquake Adm, Inst Geol, Beijing, Peoples R China |
| First Author Affilication | Institute of Geology and Geophysics, Chinese Academy of Sciences |
| Corresponding Author Affilication | Institute of Geology and Geophysics, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Cheng, Yuanzhi,Hu, Xiangyun,Han, Bo,et al. Magnetotelluric Evidence for Lithospheric Alteration Beneath the Wuyi-Yunkai Orogen: Implications for Thermal Structure of South China[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2022,23(11):17. |
| APA | Cheng, Yuanzhi,Hu, Xiangyun,Han, Bo,Li, Yiman,Kong, Yanlong,&Tang, Ji.(2022).Magnetotelluric Evidence for Lithospheric Alteration Beneath the Wuyi-Yunkai Orogen: Implications for Thermal Structure of South China.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,23(11),17. |
| MLA | Cheng, Yuanzhi,et al."Magnetotelluric Evidence for Lithospheric Alteration Beneath the Wuyi-Yunkai Orogen: Implications for Thermal Structure of South China".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 23.11(2022):17. |
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