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Lithospheric electrical structure beneath the Cathaysia Block in South China and its tectonic implications

文献类型：期刊论文

作者Cheng, Yuanzhi1,2; Han, Bo3; Li, Yiman1,2; Guo, Junfeng4; Hu, Xiangyun5
刊名TECTONOPHYSICS
出版日期2021-09-05
卷号814页码:9
关键词South China Magnetotellurics Electrical structure Hydrothermal fluid Lithospheric thinning
ISSN号0040-1951
DOI10.1016/j.tecto.2021.228981
英文摘要To better constrain the heat source of the geothermal system and lithospheric thinning mechanism of the Paleo-Pacific subduction zone, data from 35 broadband magnetotelluric (MT) stations were collected in 2020 along a 180-km-long NW-trending profile in the Cathaysia Block. Based on the measured data, we obtained the lithospheric electrical structure of the Cathaysia Block in South China using the 3D MT inversion code of ModEM. The final resistivity structure along the profile shows a series of highly conductive anomalies and highly resistive anomalies. The highly resistive anomalies in the upper crust correspond well with the distribution of magmatic rocks, which extend downwards to depths of 20 km. The highly resistive anomalies with a depth of 20-40 km are interpreted as crustal mafic sills derived from the mantle. The crustal conductors at depths of 5-15 km are typically interpreted as accumulations of aqueous fluids, which originate from the dehydration of the slab during the flat-slab subduction of the Paleo-Pacific Plate and are confined in the crust by impermeable layers. Fluid fractions of 0.8-9% would be required to explain the observed conductance values. The MT results indicate that there is no magma chamber or partial melt beneath the geothermal system. Therefore, the heat source of the geothermal system in the Cathaysia Block is radiogenic heat produced by the decay of radioactive elements in the crust. Thermal erosion has played a central role in lithospheric thinning and crust-mantle interaction of the Cathaysia Block.
WOS关键词TAUPO VOLCANIC ZONE ; HEAT-FLOW ; GEOTHERMAL SPRINGS ; THERMAL STRUCTURE ; DEEP ; SUBDUCTION ; SYSTEM ; FLUIDS ; ROCKS ; BASIN
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
WOS记录号WOS:000674657700027
出版者ELSEVIER
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/132A11/101959]  
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
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.China Univ Geosci, Inst Geol Survey, Wuhan 430074, Peoples R China
4.Wuhan SYZKer Technol Co, 19 Beitucheng Xi Lu, Beijing, Peoples R China
5.China Univ Geosci, Inst Geophys & Geomat, Key Lab Subsurface Multiscale Imaging, Wuhan 430074, Peoples R China
推荐引用方式
GB/T 7714		 Cheng, Yuanzhi,Han, Bo,Li, Yiman,et al. Lithospheric electrical structure beneath the Cathaysia Block in South China and its tectonic implications[J]. TECTONOPHYSICS,2021,814:9.
APA Cheng, Yuanzhi,Han, Bo,Li, Yiman,Guo, Junfeng,&Hu, Xiangyun.(2021).Lithospheric electrical structure beneath the Cathaysia Block in South China and its tectonic implications.TECTONOPHYSICS,814,9.
MLA Cheng, Yuanzhi,et al."Lithospheric electrical structure beneath the Cathaysia Block in South China and its tectonic implications".TECTONOPHYSICS 814(2021):9.

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来源：地质与地球物理研究所

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