The origin and geodynamic significance of the Mesozoic dykes in eastern Chock for continental China
文献类型：期刊论文
| 作者 | 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
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| 刊名 | LITHOS
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| 出版日期 | 2019-05-01 |
| 卷号 | 332页码:328-339 |
| 关键词 | Dykes Petrogenesis Subduction of the paleo-pacific plate Metasomatized lithospheric mantle Eastem China |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2019.02.024 |
| 通讯作者 | Kong, Juanjuan(juanjuan0317@foxmail.com) ; Niu, Yaoling(yaoling.niu@durham.ac.uk) |
| 英文摘要 | We 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. |
| 资助项目 | Chinese 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研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000464891900022 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/161128]  |
| 专题 | 中国科学院海洋研究所 |
| 通讯作者 | Kong, Juanjuan; Niu, Yaoling |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：海洋研究所
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