Mesozoic continental crustal rejuvenation of South China: Insights from zircon Hf-O isotopes of early Jurassic gabbros, syenites and A-type granites
文献类型：期刊论文
| 作者 | Yang, Jin-Hui1,3; Zhang, Ji-Heng3; Chen, Jing-Yuan2; Sun, Jin-Feng3 |
| 刊名 | LITHOS
 |
| 出版日期 | 2021-11-15 |
| 卷号 | 402页码:14 |
| 关键词 | Lithospheric rejuvenation Sr-Nd-Hf-O isotopes Early Jurassic Gabbro-syenite-alkali-feldspar granite South China |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2020.105678 |
| 英文摘要 | Whole rock geochemistry and Sr-Nd-Hf isotope, zircon U-Pb and Hf-O isotope data are reported for the early Jurassic gabbro-syenite-alkali-feldspar granite in the inland of South China, in order to investigate their sources, petrogenesis and tectonic implication, and to further trace the rejuvenation of continental crust of South China. The zircon U-Pb dating constrains the crystallization ages of 198-195 Ma for syenites, and of about 190 Ma for alkali-feldspar granites and gabbros, respectively. The early Jurassic gabbros have low SiO2 contents and high MgO, TiO2, Cr, V and Ni concentrations, with weak negative Nb and Ta anomalies, variable whole rock initial Sr-87/Sr-86 ratios (0.7064-0.7117), epsilon(Nd)(t) values (-1.5 to +0.6), epsilon(Hf)(t) values (-1.6 to +5.7) and zircon epsilon(Hf) (t) values (+3.4 to +6.4) and mantle-like delta O-18 values (+4.9 to +6.2 parts per thousand). They are inferred to be derived from partial melting of a fertile lithospheric mantle that had been metasomatized by subduction-related fluids/melts, with subsequent limited crustal assimilation and fractional crystallization. The early Jurassic syenites are high-K to shoshonitic rocks with weakly negative Nb and Ta anomalies, strongly negative Sr, P and Ti anomalies, unradiogenic Sr and radiogenic Nd and Hf isotopic compositions (epsilon(Nd)(t) up to +5.3 and epsilon(Hf)(t) up to +11.5), in-dicating that they were generated by low-percentage partial melting of an amphibole-bearing lithospheric man-tle, with subsequent crustal assimilation and extensive crystal fractionation and/or accumulation. The geochemical features of the early Jurassic K-feldspar granites suggest that they were mainly generated by mixing between mantle-derived mafic magma and crustal-derived felsic magma with extensive feldspar-dominant frac-tional crystallization. The early Jurassic magmatism was possibly triggered by asthenospheric upwelling follow-ing delamination of the flat-subducted Paleo-Pacific plate beneath South China, which provided heat to partial melting of above lithospheric mantle and continental crust. The underplating of depleted mantle-derived magmas changed the ancient crustal structures and modified the components of continental crust, indicating lithospheric rejuvenation during early Jurassic in South China. (C) 2020 Elsevier B.V. All rights reserved. |
| WOS关键词 | U-PB ; JIANGXI PROVINCE ; SE CHINA ; LU-HF ; SOUTHEASTERN CHINA ; INDOSINIAN OROGENY ; MANTLE BENEATH ; TRACE-ELEMENT ; ND ; SR |
| 资助项目 | National Natural Science Foundation of China[91962000] ; National Natural Science Foundation of China[41688103] ; Ministry of Science and Technology of People's Republic of China[2012CB416702] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000713001200003 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Ministry of Science and Technology of People's Republic of China ; Ministry of Science and Technology of People's Republic of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/103793]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Yang, Jin-Hui |
| 作者单位 | 1.Chinese Acad Sci, Innovat Acad Earth Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Jin-Hui,Zhang, Ji-Heng,Chen, Jing-Yuan,et al. Mesozoic continental crustal rejuvenation of South China: Insights from zircon Hf-O isotopes of early Jurassic gabbros, syenites and A-type granites[J]. LITHOS,2021,402:14. |
| APA | Yang, Jin-Hui,Zhang, Ji-Heng,Chen, Jing-Yuan,&Sun, Jin-Feng.(2021).Mesozoic continental crustal rejuvenation of South China: Insights from zircon Hf-O isotopes of early Jurassic gabbros, syenites and A-type granites.LITHOS,402,14. |
| MLA | Yang, Jin-Hui,et al."Mesozoic continental crustal rejuvenation of South China: Insights from zircon Hf-O isotopes of early Jurassic gabbros, syenites and A-type granites".LITHOS 402(2021):14. |
入库方式： OAI收割
来源：地质与地球物理研究所
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