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Magnetotelluric signatures of Neoproterozoic subduction, and subsequent lithospheric reactivation and thinning beneath central South China
Li, Xin1,2; Bai, Denghai1; Chen, Yun1,2; Deng, Yangfan2,3; Zhang, Suqin4; Xue, Shuai5
2022-06-20
Source PublicationTECTONOPHYSICS
ISSN0040-1951
Volume833Pages:19
AbstractBroadband 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.
KeywordMagnetotellurics Resistivity structure Lithospheric reactivation and thinning Jiangnan Orogenic Belt South China Block
DOI10.1016/j.tecto.2022.229365
Funding OrganizationStrategic 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
WOS KeywordJIANGNAN OROGENIC BELT ; ELECTRICAL-CONDUCTIVITY ; CATHAYSIA BLOCK ; TECTONIC EVOLUTION ; SOUTHEASTERN CHINA ; CONTINENTAL-CRUST ; MANTLE BENEATH ; PHASE TENSOR ; YANGTZE ; ROCKS
Language英语
Funding ProjectStrategic 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]
Funding OrganizationStrategic 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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000798956200001
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105990
Collection岩石圈演化国家重点实验室
Corresponding AuthorLi, Xin; Chen, Yun
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
4.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China
5.Chinese Acad Geol Sci, Inst Geol, Key Lab Deep Earth Dynam, Minist Nat Resources, Beijing 100037, Peoples R China
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
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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