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Magnetotelluric signatures of Neoproterozoic subduction, and subsequent lithospheric reactivation and thinning beneath central South China

文献类型：期刊论文

作者Li, Xin2,3; Bai, Denghai2; Chen, Yun2,3; Deng, Yangfan3,4; Zhang, Suqin5; Xue, Shuai1
刊名TECTONOPHYSICS
出版日期2022-06-20
卷号833页码:19
ISSN号0040-1951
关键词Magnetotellurics Resistivity structure Lithospheric reactivation and thinning Jiangnan Orogenic Belt South China Block
DOI10.1016/j.tecto.2022.229365
英文摘要Broadband and long-period magnetotelluric (MT) soundings were collected along a 600-km-long EW-trending profile across the southwestern segment of the Jiangnan Orogenic Belt (JOB) to explore the possible remnants of ancient tectonic processes beneath the central South China Block (SCB). Beneath the JOB, the resistivity model reveals a west-dipping, trans-lithosphere conductor ( 20 ?? ??? m) embedded within the relatively thick (80???120 km) and highly resistive ( 1000 ?? ??? m) lithosphere, possibly associated with relics of the Neoproterozoic subduction zone between the Yangtze and Cathaysia blocks. The crustal portion of this conductor is interpreted as solid conducting materials (e.g., graphite, sulfide) that were emplaced into the crust during subduction and orogenesis, whereas its lithospheric mantle portion is more likely to be volatile-bearing minerals formed by subduction-related metasomatic processes. We attribute the greatly reduced asthenospheric resistivities (1-10 ?? ??? m) below the JOB to low-degree melting of the early-formed metasomatized mantle. In contrast, the lithosphere of the Cathaysia Block is evidently thinned (60???100 km) and segmented by several subvertical, lithospheric-scale conductors (1-30 ?? ??? m) that are likely associated with fossil fluid pathways along reactivated shear/fault zones. Notably, the thinnest lithosphere sits above a prominent low-resistivity (10 - 30 ?? ??? m) anomaly in the asthenospheric mantle and is spatially coincident with the location of Late Jurassic basaltic outcrops. We interpret these features as signs of lithospheric extension and asthenospheric upwelling driven by roll-back of the Paleo-Pacific Plate during the Late Mesozoic. The results provide key constraints on subduction???accretion tectonics associated with the Neoproterozoic assembly of the SCB and the subsequent lithospheric evolution during the Phanerozoic.
WOS关键词JIANGNAN OROGENIC BELT ; ELECTRICAL-CONDUCTIVITY ; CATHAYSIA BLOCK ; TECTONIC EVOLUTION ; SOUTHEASTERN CHINA ; CONTINENTAL-CRUST ; MANTLE BENEATH ; PHASE TENSOR ; YANGTZE ; ROCKS
资助项目Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences[XDB18000000] ; National Key R&D Program of China[2016YFC0600402] ; National Natural Science Foundation of China[42004063] ; National Natural Science Foundation of China[41874087] ; National Natural Science Foundation of China[:10.12197/2021 GA022]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者ELSEVIER
WOS记录号WOS:000798956200001
资助机构Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program 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 ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program 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 ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program 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 ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; Strategic Priority Research Pro-gram (B) of the Chinese Academy of Sciences ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program 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/132A11/105990]  
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Li, Xin; Chen, Yun
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 Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
5.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China
推荐引用方式
GB/T 7714		 Li, Xin,Bai, Denghai,Chen, Yun,et al. Magnetotelluric signatures of Neoproterozoic subduction, and subsequent lithospheric reactivation and thinning beneath central South China[J]. TECTONOPHYSICS,2022,833:19.
APA Li, Xin,Bai, Denghai,Chen, Yun,Deng, Yangfan,Zhang, Suqin,&Xue, Shuai.(2022).Magnetotelluric signatures of Neoproterozoic subduction, and subsequent lithospheric reactivation and thinning beneath central South China.TECTONOPHYSICS,833,19.
MLA Li, Xin,et al."Magnetotelluric signatures of Neoproterozoic subduction, and subsequent lithospheric reactivation and thinning beneath central South China".TECTONOPHYSICS 833(2022):19.

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来源：地质与地球物理研究所

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