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Magnetotelluric Evidence for Lithospheric Alteration Beneath the Wuyi-Yunkai Orogen: Implications for Thermal Structure of South China

文献类型：期刊论文

作者Cheng, Yuanzhi1; Hu, Xiangyun2; Han, Bo3; Li, Yiman1; Kong, Yanlong1; Tang, Ji4
刊名GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
出版日期2022-11-01
卷号23期号:11页码:17
关键词South China Wuyi-Yunkai Orogen magnetotelluric lithospheric alteration thermal structure
DOI10.1029/2022GC010456
英文摘要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.
WOS关键词CATHAYSIA BLOCK ; ELECTRICAL-CONDUCTIVITY ; TECTONIC EVOLUTION ; SHIWANDASHAN BASIN ; CONTINENTAL CHINA ; GEOTHERMAL-FIELD ; MANTLE ; FLUID ; CONSTRAINTS ; MAGMATISM
资助项目National Key Research and Development Project of China[2019YFC0604901] ; National Natural Science Foundation of China[42004060] ; National Natural Science Foundation of China[41630317]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:000878683400001
资助机构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
源URL[http://ir.iggcas.ac.cn/handle/132A11/107709]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Cheng, Yuanzhi; Hu, Xiangyun
作者单位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
推荐引用方式
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.

入库方式： OAI收割

来源：地质与地球物理研究所

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