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| Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China | |
Wu, Kai1,2; Ling, Ming-Xing3,4; Hu, Yong-Bin1; Guo, Jia1,2; Jiang, Xiao-Yan1; Sun, Sai-Jun1; Liang, Hua-Ying1; Liu, Xu5; Sun, Weidong2,4,6,7
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| 2018-06-01 | |
| 发表期刊 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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| ISSN | 1525-2027 |
| 卷号 | 19期号:6页码:1767-1788 |
| 通讯作者 | Ling, Ming-Xing(mxling@gig.ac.cn) |
| 摘要 | Adakitic rocks with high MgO content and lower crust affinity at convergent margins provide important constraints on arc crust evolution and regional tectonics. An integrated study on the only adakitic pluton with high MgO content and its mafic microgranular enclaves (MMEs) in the Early Paleozoic North Qinling arc terrane was conducted in this paper. Zircons from 2 host rock samples yielded identical weighted mean ages of 428 Ma. The MMEs contain two types of zircons: type 1 zircons share similar morphology, chemical composition, and indistinguishable age with those from the host rock; type 2 zircons yielded an older age of 450 Ma. The similarity in zircon Hf isotopic composition for these zircons indicates a cognate origin of the MMEs. However, the lower Ce4+/Ce3+, higher crystallization temperature and the LREE overabundance of type 2 zircons indicate that mafic intrusions in the lower arc crust were subjected to a post-magmatic event at similar to 450 Ma. Samples from the Tangzang pluton are characterized by typical adakitic geochemical features, and high MgO (Mg#: 50-52), Cr, Ni, and Ba contents. Considering their similar isotopic compositions with the Neoproterozoic metabasites in the North Qinling terrane, we argue that the Tangzang pluton was generated by crustal anatexis of two sources with contributions from the metasomatized mantle wedge. The mantle connection was achieved by aqueous melt-fluxed melting of a "hot zone'' in the lower arc crust. This implies that andesitic continental crust with Mg# of similar to 0.5 may also be associated with fluxed-melting of the lower arc crust. |
| DOI | 10.1029/2017GC007395 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Key R&D Program of China[2017YFC0602301] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18020102] ; Guangdong Natural Science Funds[2014A030306032] ; Guangdong Natural Science Funds[2015TQ01Z611] ; Youth Innovation Promotion Association CAS[2016315] ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Sino Shaanxi Nuclear Industry Group ; National Key R&D Program of China[2017YFC0602301] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18020102] ; Guangdong Natural Science Funds[2014A030306032] ; Guangdong Natural Science Funds[2015TQ01Z611] ; Youth Innovation Promotion Association CAS[2016315] ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences ; Sino Shaanxi Nuclear Industry Group |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000445194000004 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/160169 |
| 专题 | 深海极端环境与生命过程研究中心 |
| 通讯作者 | Ling, Ming-Xing |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangzhou, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China 4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 5.Sino Shaanxi Nucl Ind Grp, Geol Team 211, Xian, Shaanxi, Peoples R China 6.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanog, Qingdao, Peoples R China 7.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Kai,Ling, Ming-Xing,Hu, Yong-Bin,et al. Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2018,19(6):1767-1788. |
| APA | Wu, Kai.,Ling, Ming-Xing.,Hu, Yong-Bin.,Guo, Jia.,Jiang, Xiao-Yan.,...&Sun, Weidong.(2018).Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,19(6),1767-1788. |
| MLA | Wu, Kai,et al."Melt-Fluxed Melting of the Heterogeneously Mixed Lower Arc Crust: A Case Study from the Qinling Orogenic Belt, Central China".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 19.6(2018):1767-1788. |
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