IOCAS-IR
The origin and geodynamic significance of the Mesozoic dykes in eastern Chock for continental China
Kong, Juanjuan1,2,3; Niu, Yaoling1,2,4,5; Sun, Pu1,2; Xiao, Yuanyuan1,2; Guo, Pengyuan1,2; Hong, Di1,2,3; Zhang, Yu2; Shao, Fengli6; Wang, Xiaohong1,2; Duan, Meng1,5
2019-05-01
Source PublicationLITHOS
ISSN0024-4937
Volume332Pages:328-339
Corresponding AuthorKong, Juanjuan(juanjuan0317@foxmail.com) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
AbstractWe sampled 22 Mesozoic dykes in eastern continental China and carried out a detailed study on these samples, including K-Ar and zircon U-Pb geochronology, and elemental and Sr-Nd-Pb-Hf isotope geochemistry. Their K-Ar and zircon ages of 130-110 Ma are broadly consistent with the timing of the lithosphere thinning and the emplacement ages of widespread granitoids in the vast region, explicitly pointing to a common cause in space and time. The dykes represent evolved alkaline basaltic melts intruding the Mesozoic granitoids. Their rare earth element (REE) and multi-element patterns differ from the present-day ocean island basalts (OIB), but show strong arc-like signatures (e.g., enrichment in Rb and Pb and depletion in Nb, Ta and Ti). They show high (Sr-87/Sr-86)(i), (0.7048 to 0.7103), low epsilon(Nd)(t) (-12.3 to -5.7), low epsilon(Hf)(t) (-16.5 to -8.0) and low (Pb-206/Pb-204)(i) (18.79-18.85). These Mesozoic dykes are best understood as resulting from melting of geochemically enriched subcontinental lithospheric mantle (SCLM), whose geochemical enrichment is consistent with prior metasomatism with the agent being hydrous melt coming from subduction of the Paleo-Pacific plate at similar to 120 Ma or earlier. Similar to the present-day situation, the paleo-Pacific slab may have also existed stagnant in the mantle transition zone in the Mesozoic. The slab dehydrated and released water in the form of hydrous melt that percolated through and metasomatized the mantle lithosphere, and weakened the base of the lithosphere while producing basaltic melts that evolved to intermediate-felsic compositions of these dykes. The basaltic magmas that underplated and melted the lower crust to generate the widespread Mesozoic granitoids in eastern continental China. (C) 2019 Elsevier B.V. All rights reserved.
KeywordDykes Petrogenesis Subduction of the paleo-pacific plate Metasomatized lithospheric mantle Eastem China
DOI10.1016/j.lithos.2019.02.024
Indexed BySCI
Language英语
Funding ProjectChinese Academy of Sciences ; Qingdao National laboratory of ocean sciences and Technology[2015ASKJ03] ; National Natural Science Foundation of China[41630968] ; National Natural Science Foundation of China[91014003] ; 111 Project of China[B118048] ; Shandong Province[U1606401] ; City of Qingdao[U1606401]
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000464891900022
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/161129
Collection中国科学院海洋研究所
Corresponding AuthorKong, Juanjuan; Niu, Yaoling
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Shandong, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
5.China Univ Geosci, Beijing 100083, Peoples R China
6.Linyi Univ, Linyi 276000, Shandong, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Kong, Juanjuan,Niu, Yaoling,Sun, Pu,et al. The origin and geodynamic significance of the Mesozoic dykes in eastern Chock for continental China[J]. LITHOS,2019,332:328-339.
APA Kong, Juanjuan.,Niu, Yaoling.,Sun, Pu.,Xiao, Yuanyuan.,Guo, Pengyuan.,...&Duan, Meng.(2019).The origin and geodynamic significance of the Mesozoic dykes in eastern Chock for continental China.LITHOS,332,328-339.
MLA Kong, Juanjuan,et al."The origin and geodynamic significance of the Mesozoic dykes in eastern Chock for continental China".LITHOS 332(2019):328-339.
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