IOCAS-IR  > 海洋地质与环境重点实验室
Tectonic significance of the Cretaceous granitoids along the south-east coast of continental China
Xue, Qiqi1,2; Niu, Yaoling1,2,3,4; Chen, Shuo2,3,5; Sun, Pu2,3; Duan, Meng1,2; Gao, Yajie2,3,5; Hong, Di2,3,5; Xiao, Yuanyuan2,3; Wang, Xiaohong2,3; Guo, Pengyuan2,3
2020
Source PublicationGEOLOGICAL JOURNAL
ISSN0072-1050
Volume55Issue:1Pages:173-196
Corresponding AuthorXue, Qiqi(xueq0451@foxmail.com) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
AbstractWe present the results of our study on 16 Cretaceous granitoid plutons along the south-east coast of continental China. The zircon U-Pb ages and the bulk-rock Rb-Sr isochron age (R-2 = 0.935) indicate that the granitoids represent the last episode of magmatism (119-92 Ma) associated with the paleo-Pacific Plate subduction beneath continental China. These granitoids show large compositional variation that is to a first-order consistent with varying extents of magma evolution, which is best expressed by a large SiO2/MgO range and correlated trends of SiO2/MgO with the abundances and ratios of major and trace elements. The correlated Nd (epsilon Nd-(t) = -6.1 to -1.2) and Hf (epsilon Hf-(t) = -4.7 to +3.4) isotopic variation reflects parental magma compositional differences as a result of varying sources and processes. The Nd-Hf isotope data indicate that these granitoids were produced by mature continental crust melting with significant mantle input (similar to 20-60%). Rhyolite-MELTS modelling shows that relative to the less evolved (i.e., low SiO2/MgO) granitoid plutons, the progressively more evolved (i.e., varying larger SiO2/MgO) plutons can be explained by varying extents (similar to 24% to 67%) of fractional crystallization. The origin of the magmas parental to the granitoids is best explained by a two-stage process: (a) subducting slab dehydration-induced mantle wedge melting for basaltic magmas and (b) ascent and underplating/intrusion of the basaltic magmas caused the mature crustal melting for the granitoid magmas. The systematic northward decrease in epsilon Nd-(t) and epsilon Hf-(t) suggests progressively more enriched crustal material towards the north, but it may very well indicate northward crustal thickening, permitting a greater extent of crustal assimilation.
KeywordCretaceous granitoids crustal thickness variation crust-mantle interaction paleo-Pacific Plate subduction south-east continental China
DOI10.1002/gj.3388
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41130314] ; National Natural Science Foundation of China[41776067] ; National Natural Science Foundation of China[NSFC41630968] ; Scientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; 111 Project[B18048] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; Chinese Academy of Sciences[Y42217101L]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000508025400011
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/164389
Collection海洋地质与环境重点实验室
Corresponding AuthorXue, Qiqi; Niu, Yaoling
Affiliation1.China Univ Geosci, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
3.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
5.Univ Chinese Acad Sci, Beijing, Peoples R China
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xue, Qiqi,Niu, Yaoling,Chen, Shuo,et al. Tectonic significance of the Cretaceous granitoids along the south-east coast of continental China[J]. GEOLOGICAL JOURNAL,2020,55(1):173-196.
APA Xue, Qiqi.,Niu, Yaoling.,Chen, Shuo.,Sun, Pu.,Duan, Meng.,...&Guo, Pengyuan.(2020).Tectonic significance of the Cretaceous granitoids along the south-east coast of continental China.GEOLOGICAL JOURNAL,55(1),173-196.
MLA Xue, Qiqi,et al."Tectonic significance of the Cretaceous granitoids along the south-east coast of continental China".GEOLOGICAL JOURNAL 55.1(2020):173-196.
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