| Origin of the Jurassic-Cretaceous intraplate granitoids in Eastern China as a consequence of paleo-Pacific plate subduction | |
Hong, Di1,2,3 ; Niu, Yaoling1,2,4,5; Xiao, Yuanyuan1,2; Sun, Pu1,2; Kong, Juanjuan1,2,3; Guo, Pengyuan1,2; Shao, Fengli6; Wang, Xiaohong1,2; Duan, Meng5; Xue, Qiqi5; Gong, Hongmei1,2; Chen, Shuo1,2
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| 2018-12-01 | |
| 发表期刊 | LITHOS
 |
| ISSN | 0024-4937 |
| 卷号 | 322页码:405-419 |
| 通讯作者 | Hong, Di([email protected]) ; Niu, Yaoling([email protected]) |
| 摘要 | Jurassic-Cretaceous granitoids are widespread in eastern continental China and have been considered by many as resulting from paleo-Pacific subduction. However, the actual mechanism of their petrogenesis remains speculative. In order to address this important problem and on the basis of our regional study, we hypothesized that the coastal granitoids may result directly from the paleo-Pacific plate subduction, whereas the widespread granitoids in the continental interiors ultimately result from dehydration of the paleo-Pacific slab stagnated in the mantle transition zone (Niu et at., 2015). Here, we present the very first study testing this hypothesis. We sampled 18 Jurassic-Cretaceous granitoid plutons along a similar to 1300 km long traverse parallel to the inferred paleo-Pacific subduction from the southeast coastline to the Xiaoqinling in the continental interiors and carried out a detailed study on these plutonic samples, including zircon U-Pb geochronology, bulk-rock major and trace element compositions and Sr-Nd-Pb-Hf isotopic characteristics. These plutons give varying zircon crystallization ages of similar to 146 to 100 Ma. They are mostly granitic and minor granodioritic, quartz monzonitic and syenitic in composition, enriched in large ion lithophile elements (LILEs), depleted in high field-strength elements (HFSEs) and have varying negative Sr and Eu anomalies. The plutons in the continental interiors show significant positive correlations of Nd (epsilon(Nd) (t) = -25.5 to -10.9) and Hf (epsilon(Hf) (t) = -31.5 to -11.3) isotopes with Pb isotopes (Pb-206/Pb-204 (t) = 15.827 to 17.622), with the enriched endmember characterized by low epsilon(N)(d) (t), epsilon(Hf) (t) and Pb-206/Pb-204 (t). The plutons towards the coastal region have relatively high epsilon(N)(d) (t) (-9.0 to -5.2), epsilon(Hf) (t) (-11.2 to -4.1) and Pb-206/Pb-204 (t) (18.051 to 18.349). The coastal granitoids are best explained as resulting directly from subduction slab dehydration induced mantle wedge melting and resultant crustal anatexis, whereas the interior granitoids are best interpreted as resulting from mature crustal anataxis caused by basaltic magmatism associated with mantle lithosphere thinning, ultimately triggered by dehydration of paleo-Pacific slab stagnant in the mantle transition zone. (C) 2018 Elsevier B.V. All rights reserved. |
| 关键词 | Jurassic-cretaceous granitoids in eastern China Lithosphere thinning Basal hydration weakening Paleo-Pacific plate subduction Crustal melting |
| DOI | 10.1016/j.lithos.2018.10.027 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Marine Geological Process and Environment[U1606401]###542; NSFC[41630968]###543; Chinese Academy of Sciences[Y42217101L]###544; 111 Project of China[B118048]###545; Marine Geological Process and Environment[U1606401]; NSFC[41630968]; Chinese Academy of Sciences[Y42217101L]; 111 Project of China[B118048] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| WOS类目 | Geochemistry & Geophysics ; Mineralogy |
| WOS记录号 | WOS:000452817700026 |
| 出版者 | ELSEVIER SCIENCE BV |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/155763 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Hong, Di; Niu, Yaoling |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, 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, Sch Earth Sci & Mineral Resources, Beijing 100083, Peoples R China 6.Linyi Univ, Inst Geol & Paleontol, Linyi 276000, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Hong, Di,Niu, Yaoling,Xiao, Yuanyuan,et al. Origin of the Jurassic-Cretaceous intraplate granitoids in Eastern China as a consequence of paleo-Pacific plate subduction[J]. LITHOS,2018,322:405-419. |
| APA | Hong, Di.,Niu, Yaoling.,Xiao, Yuanyuan.,Sun, Pu.,Kong, Juanjuan.,...&Chen, Shuo.(2018).Origin of the Jurassic-Cretaceous intraplate granitoids in Eastern China as a consequence of paleo-Pacific plate subduction.LITHOS,322,405-419. |
| MLA | Hong, Di,et al."Origin of the Jurassic-Cretaceous intraplate granitoids in Eastern China as a consequence of paleo-Pacific plate subduction".LITHOS 322(2018):405-419. |
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