Reworking of juvenile crust: Element and isotope evidence from Neoproterozoic granodiorite in South China
文献类型：期刊论文
| 作者 | Wu, Rong-Xin; Zheng, Yong-Fei; Wu, Yuan-Bao; Zhao, Zi-Fu; Zhang, Shao-Bing; Liu, Xiaoming; Wu, Fu-Yuan |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2006-05-10 |
| 卷号 | 146期号:3-4页码:179-212 |
| 关键词 | Peraluminous Granite Geochronology Geochemistry Petrogenesis Arc-continent Collision Continental Growth Extensional Collapse |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2006.01.012 |
| 文献子类 | Review |
| 英文摘要 | A combined study of geochronology and geochemistry was carried out for Neoproterozoic granodiorites at the southeastern margin of the Yangtze Block in South China. The results demonstrate that sedimentary rocks derived from juvenile crust were melted to form strongly peraluminous granite in an arc-continent collision zone, resulting in continental growth. LA-ICPMS zircon U-Pb dating yields two groups of age at 824 +/- 6 and 882 +/- 16 Ma, respectively. From CL images, the young zircons are new grains or rims of homogeneous structure with magmatic zoning, whereas most of the old ages occur in cores or as single xenocrysts. The granodiorites show high A/CNK ratios of 1.38-1.89 and strong negative Nb and Ta anomalies as well as high 3180 values of 11.9-14.0 parts per thousand for quartz and 8.1-10.2 parts per thousand for zircon, pointing to a supracrustal origin characteristic of S-type granites. On the other hand, they have Positive epsilon(Hf)(t) values of 3.4 +/- 1.6 to 5.4 +/- 2.6 for zircon, neutral epsilon(Nd)(t) values of -2.06 to 0.02 and low to medium initial Sr-87/(86) Sr ratios of 0.7033-0.7087 for whole-rock, indicating a magmatic source with significant components of juvenile crust similar to I-type granites. Relatively refractory minerals like zircon, garnet and quartz retain their magmatic 0 isotope ratios, whereas the other minerals, such as K-feldspar, plagioclase and biotite that show 0 isotopic disequilibria when paired with quartz, suffered different degrees of post-magmatic alteration at subsolidus temperatures. On the basis of element and isotope-eochemistry, we interpret the 882 16 Ma zircons as being inherited from arc-derived igneous rocks, and the 824 6 Ma zircons as having crystallized from an anatectic crustally-derived magma. Arc-continent collision is inferred to have taken place at ca. 900 +/- 20 Ma during assembly of the supercontinent Rodinia. Subsequent to weathering of juvenile crust in the back-arc basin, low-maturity sedimentary rocks were deposited from about 880 to 830Ma between the Yangtze and Cathaysia Blocks. Extensional collapse of the collisional orogen at about 830-820 Ma is suggested as a geodynamic mechanism for burial and melting of the sediments of juvenile crust to produce the S-type granodiorites. As a result, the granodiorites are characterized by the features of both S- and 1-type granites, and thus testify to the short-term recycling of juvenile crust with significant contributions to continental growth. The syn- and post-collisional magmatism may be a basic mechanism to result in compositional evolution from arc crust to continental crust. (c) 2006 Elsevier B.V. All rights reserved. |
| WOS关键词 | U-PB METHOD ; SM-ND ; LU-HF ; MANTLE PLUME ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; YANGTZE BLOCK ; BREAK-UP ; HYDROTHERMAL CONDITIONS ; PERALUMINOUS GRANITES |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000237610500005 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66160]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zheng, Yong-Fei |
| 作者单位 | 1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS, Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China 2.NW Univ Xian, Dept Geol, MOE, Key Lab Continental Dynam, Xian 710069, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Rong-Xin,Zheng, Yong-Fei,Wu, Yuan-Bao,et al. Reworking of juvenile crust: Element and isotope evidence from Neoproterozoic granodiorite in South China[J]. PRECAMBRIAN RESEARCH,2006,146(3-4):179-212. |
| APA | Wu, Rong-Xin.,Zheng, Yong-Fei.,Wu, Yuan-Bao.,Zhao, Zi-Fu.,Zhang, Shao-Bing.,...&Wu, Fu-Yuan.(2006).Reworking of juvenile crust: Element and isotope evidence from Neoproterozoic granodiorite in South China.PRECAMBRIAN RESEARCH,146(3-4),179-212. |
| MLA | Wu, Rong-Xin,et al."Reworking of juvenile crust: Element and isotope evidence from Neoproterozoic granodiorite in South China".PRECAMBRIAN RESEARCH 146.3-4(2006):179-212. |
入库方式： OAI收割
来源：地质与地球物理研究所
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