Mineral isotope evidence for the contemporaneous process of Mesozoic granite emplacement and gneiss metamorphism in the Dabie orogen
文献类型：期刊论文
| 作者 | Xie, Zhi; Zheng, Yong-Fei; Zhao, Zi-Fu; Wu, Yuan-Bao; Wang, Zhengrong; Chen, Jiangfeng; Liu, Xiaoming; Wu, Fu-Yuan |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2006-07-30 |
| 卷号 | 231期号:3页码:214-235 |
| 关键词 | collisional orogen extensional collapse magmatism metamorphism radiometric dating Hf and O isotopes isotopic equilibrium |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2006.01.028 |
| 文献子类 | Article |
| 英文摘要 | Kinetics of isotopic equilibrium in the mineral radiometric systems of igneous and metamorphic rocks is an important issue in geochromology. It turns out that temperature is the most important factor in dictating isotopic equilibrium or disequilibrium with respect to diffusion mechanism. Contemporaneous occurrence of Mesozoic granites and gneisses in the Dabie orogen of China allows us to evaluate the thermal effect of magma emplacement and associated metamorphism on mineral radiometric systems. Zircon U-Pb, mineral Rb-Sr and O isotope analyses were carried out for a Cretaceous granite and its host gneiss (foliated granite) from North Dabie. Zircon U-Pb dating gave consistently concordant ages of 127 +/- 3 Ma and 128 +/- 2 Ma for the granite and the gneiss, respectively. A direct correspondence in equilibrium state is observed between the O and Rb-Sr isotope systems of both granitic and gneissic minerals. Mineral O isotope temperatures correlate with diffusion closure temperatures under conditions of slow cooling, indicating attainment and preservation of O isotope equilibrium in these minerals. The mineral Rb-Sr isochron of granite, constructed by biotite, feldspar, apatite and whole-rock with the O isotope equilibrium, yields a meaningful age of 118 +/- 3 Ma, which is in accordance with the mineral Rb-Sr isochron age of 122 +/- 1 Ma for the host gneiss. The consistency in both U-Pb and Rb-Sr ages between the granite and the gneiss suggests a contemporaneous process of crystallizing the zircons and resetting the Rb-Sr radiometric systems during magma emplacement and granite foliation. Whereas the zircon U-Pb ages for both granite and gneiss are interpreted as the timing of magma crystallization, the young Rb-Sr isochron ages record the timing of Sr diffusion closure during the slow cooling. Protolith of the gneiss crystallized shortly before intrusion of the granite, so that it was able to be foliated by voluminous emplacement of coeval mafic to felsic magmas derived by anatexis of orogenic lithospheric keel. Therefore, extensional collapse of collision-thickened crust at Early Cretaceous is suggested to trigger the post-collisional magmatism, which in turn serves as an essential driving force for the contemporaneous high-T deformation/metamorphism. (c) 2006 Elsevier B.V All rights reserved. |
| WOS关键词 | EAST-CENTRAL CHINA ; ULTRAHIGH-PRESSURE METAMORPHISM ; ZIRCON U-PB ; SUBDUCTED CONTINENTAL-CRUST ; NORTH DABIE ; SM-ND ; TRACE-ELEMENT ; LU-HF ; EXCIMER-LASER ; OXYGEN |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000239261400004 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67170]  |
| 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 Kay 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 | Xie, Zhi,Zheng, Yong-Fei,Zhao, Zi-Fu,et al. Mineral isotope evidence for the contemporaneous process of Mesozoic granite emplacement and gneiss metamorphism in the Dabie orogen[J]. CHEMICAL GEOLOGY,2006,231(3):214-235. |
| APA | Xie, Zhi.,Zheng, Yong-Fei.,Zhao, Zi-Fu.,Wu, Yuan-Bao.,Wang, Zhengrong.,...&Wu, Fu-Yuan.(2006).Mineral isotope evidence for the contemporaneous process of Mesozoic granite emplacement and gneiss metamorphism in the Dabie orogen.CHEMICAL GEOLOGY,231(3),214-235. |
| MLA | Xie, Zhi,et al."Mineral isotope evidence for the contemporaneous process of Mesozoic granite emplacement and gneiss metamorphism in the Dabie orogen".CHEMICAL GEOLOGY 231.3(2006):214-235. |
入库方式： OAI收割
来源：地质与地球物理研究所
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