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Zircon U-Pb age, Hf and O isotope constraints on protolith origin of ultrahigh-pressure eclogite and gneiss in the Dable orogen
文献类型：期刊论文
| 作者 | Zheng, Yong-Fei; Zhao, Zi-Fu; Wu, Yuan-Bao; Zhang, Shao-Bing; Liu, Xiaoming; Wu, Fu-Yuan |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2006-07-15 |
| 卷号 | 231期号:1-2页码:135-158 |
| 关键词 | zircon isotopes Dabie orogen neoproterozoic protolith continental groxvth bimodal composition crust-mantle interaction rift magmatism Rodinia breakup |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2006.01.005 |
| 文献子类 | Review |
| 英文摘要 | Zircon U-Pb dating, Hf and O isotope analyses were carried out for ultrahigh-pressure eclogite and felsic gneiss from the Dabie orogen in China. The results provide constraints on their protolith origin, with significance for continental growth by rift magmatism during splitting of the Yangtze Block from the supercontinent Rodinia. Mafic and felsic protoliths formed as a bimodal volcanic suite at about 750 Ma, with incorporation of ca. 2.15 Ga crust into the felsic protolith. delta O-18 values of -4.1 parts per thousand to 4.4 parts per thousand suggest differential involvement of meteoric water in protolith magmas. Initial Hf isotope ratios are subdivided into two groups, with positive epsilon(Hf)(t) values of 12.9 +/- 0.7 to 5.9 +/- 0.9 and neutral epsilon(Hf)(t) values of 2.3 +/- 0.3 to -2.7 +/- 0.6, respectively. The positive epsilon(Hf)(t) values correspond to depleted mantle Hf model ages of 0.82 to 1.24 Ga, whereas the negative epsilon(Hf)(t) values correspond to crust Hf model ages of 1.82 +/- 0.07 Ga. A few zircons from the gneiss have strongly negative epsilon(Hf)(t) values of -22.6 +/- 0.6, which are associated not only with consistent depleted mantle and crust Hf model ages of 2.2 Ga but also with the old U-Pb ages falling on a 2147 +/- 22 Ma discordia line. Thus the felsic protolith contains Paleoproterozoic, crustal relicts. some of which were originally derived from coeval depleted mantle. On the other hand, strongly positive values are associated with young U-Pb ages falling on the similar to 750 Ma discordia lines. This suggests that both eclogite and gneiss protoliths principally formed by immediate reworking of mid-Neoproterozoic juvenile crust, with contrasting features only in petrochemistry. The highest epsilon(Ht)(t) values of 12.7 to 14.4 for the eclogite correspond to the youngest Hf model ages of 0.75 to 0.82 Ga relative to the depleted mantle reservoir. These Hf model ages are not only close to the timing of zircon growth from the mafic magma, but also similar to ages for bimodal magmatism in the periphery of the Yangtze Block. This demonstrates new addition of the depleted mantle material to the continental crust by rift magmatism in the northern margin of the Yangtze Block, with coeval crust-mantle interaction in the mid-Neoproterozoic rifting tectonic zone. Therefore, the bimodal magmatism at about 750 Ma transports both heat and material from the mantle to the crust, resulting in reworking of both the Paleoproterozoic old crust and the meteoric-hydrothermally altered juvenile crust along the active rifting zone. (c) 2006 Elsevier B.V. All rights reserved. |
| WOS关键词 | COESITE-BEARING ECLOGITES ; EAST-CENTRAL CHINA ; ARCHEAN CRUSTAL EVOLUTION ; PLASMA-MASS SPECTROMETRY ; DABIE MOUNTAINS ; OXYGEN-ISOTOPE ; CONTINENTAL-CRUST ; LU-HF ; SM-ND ; TECTONIC IMPLICATIONS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000238883500011 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66592]  |
| 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 Crustf Mantle Mat & Environm, Hefei 230026, Peoples R China 2.Chinese Acad Sci, State Key Lab Lithosphere Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.NW Univ Xian, MOE Key Lab Continental Dynam, Dept Geol, Xian 710069, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zheng, Yong-Fei,Zhao, Zi-Fu,Wu, Yuan-Bao,et al. Zircon U-Pb age, Hf and O isotope constraints on protolith origin of ultrahigh-pressure eclogite and gneiss in the Dable orogen[J]. CHEMICAL GEOLOGY,2006,231(1-2):135-158. |
| APA | Zheng, Yong-Fei,Zhao, Zi-Fu,Wu, Yuan-Bao,Zhang, Shao-Bing,Liu, Xiaoming,&Wu, Fu-Yuan.(2006).Zircon U-Pb age, Hf and O isotope constraints on protolith origin of ultrahigh-pressure eclogite and gneiss in the Dable orogen.CHEMICAL GEOLOGY,231(1-2),135-158. |
| MLA | Zheng, Yong-Fei,et al."Zircon U-Pb age, Hf and O isotope constraints on protolith origin of ultrahigh-pressure eclogite and gneiss in the Dable orogen".CHEMICAL GEOLOGY 231.1-2(2006):135-158. |
入库方式： OAI收割
来源：地质与地球物理研究所
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