Obduction-type granites within the NE Jiangxi Ophiolite: Implications for the final amalgamation between the Yangtze and Cathaysia Blocks
文献类型：期刊论文
| 作者 | Li, Wu-Xian2; Li, Xian-Hua1; Li, Zheng-Xiang4; Lou, Fa-Sheng3 |
| 刊名 | GONDWANA RESEARCH
 |
| 出版日期 | 2008-04-01 |
| 卷号 | 13期号:3页码:288-301 |
| 关键词 | granites obduction ophiolite neoproterozoic South China |
| ISSN号 | 1342-937X |
| DOI | 10.1016/j.gr.2007.12.010 |
| 文献子类 | Article |
| 英文摘要 | Leucogranitic lenses are found within the Xiwan ophiolitic melange in northeastern Jiangxi Province, South China. The leucogranites occur exclusively within the serpentinized peridotite unit of the ophiolite suite. SHRIMP U-Pb zircon dating results indicate that these granites were formed at 880 +/- 19 Ma, and were overprinted by an Indosinian tectono-thermal event at similar to 230 Ma. The leucogranites are peraluminous (A/CNK=1.0-1.24), characterized by high Al(2)O(3) (14-18.33%) and Na(2)O (6.5-10%) and clearly low epsilon Nd(T) values of 0.8 to -3.9 compared with the other rock units of the ophiolite suite. On the basis of their REE characters, the leucogranites can be divided into three groups. Group I leucogranites show the most fractionated LREE-enrichment patterns (with La(N)/Yb(N) and La(N)/Sm(N) ratios of 30.1-75.0 and 2.3-3.9, respectively). Group II leucogranites have moderately fractionated LREE-enrichment patterns (with La(N)/Yb(N) and La(N)/Sm(N) ratios of 13.1-26.5 and 0.8-1.9, respectively). Group III leucogranites are characterized by obviously low total REE contents and flat REE patterns with significant positive Eu anomalies, probably due to small degrees of partial melting. All these leucogranites were likely formed by partial melting of sedimentary rocks from a marginal basin at the Yangtze side of the orogen, beneath a major thrust fault during the obduction of the ophiolite onto the continental crust. They are broadly similar to obduction-related granites within ophiolites identified in many places worldwide. Identification of the ca. 880 Ma obduction-type granites in the NE Jiangxi ophiolite provides a petrological constraint on the timing of the ophiolite obduction onto the continental crust. In combination with the termination of the Shuangxiwu arc magmatism at ca. 890 Ma, we interpret that the close of the Neoproterozoic back-arc basin and the termination of the continental amalgamation between the Yangtze and Cathaysia Blocks occurred at ca. 880 Ma. (C) 2007 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
| WOS关键词 | PB ZIRCON GEOCHRONOLOGY ; NEOPROTEROZOIC TECTONIC EVOLUTION ; GA CONTINENTAL-CRUST ; SOUTH CHINA ; BREAK-UP ; SM-ND ; GEOCHEMICAL EVIDENCE ; SOUTHEASTERN CHINA ; RAPID EMPLACEMENT ; SEMAIL OPHIOLITE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000254659200002 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/69578]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Li, Xian-Hua |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Peoples R China 3.Geol Survey Jiangxi Prov, Nanchang 330201, Peoples R China 4.Curtin Univ Technol, Dept Appl Geol, Inst Geosci Res, Perth, WA 6845, Australia |
| 推荐引用方式 GB/T 7714 | Li, Wu-Xian,Li, Xian-Hua,Li, Zheng-Xiang,et al. Obduction-type granites within the NE Jiangxi Ophiolite: Implications for the final amalgamation between the Yangtze and Cathaysia Blocks[J]. GONDWANA RESEARCH,2008,13(3):288-301. |
| APA | Li, Wu-Xian,Li, Xian-Hua,Li, Zheng-Xiang,&Lou, Fa-Sheng.(2008).Obduction-type granites within the NE Jiangxi Ophiolite: Implications for the final amalgamation between the Yangtze and Cathaysia Blocks.GONDWANA RESEARCH,13(3),288-301. |
| MLA | Li, Wu-Xian,et al."Obduction-type granites within the NE Jiangxi Ophiolite: Implications for the final amalgamation between the Yangtze and Cathaysia Blocks".GONDWANA RESEARCH 13.3(2008):288-301. |
入库方式： OAI收割
来源：地质与地球物理研究所
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