Late Oligocene crustal anatexis and melt/fluid migration in the Ailao Shan tectonic belt: Evidences from zircon U-Pb ages and trace element compositions
文献类型：期刊论文
| 作者 | Wang DongBing; Tang Yuan; Luo Liang; Liao ShiYong; Yin FuGuang; Wang BaoDi |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2017 |
| 卷号 | 33期号:7页码:2037-2053 |
| 英文摘要 | The Ailao Shan tectonic belt is an important tectonic boundary in southeast of the Qinghai-Tibetan Plateau and consists mainly of high-grade metamorphic rocks previously thought to be Paleoproterozoic basement rocks. In-situ LA-ICP-MS U-Pb age and trace element of zircons were determined for the Ailao Shan high-grade metamorphic rocks. Zircon U-Pb geochronological data indicate that the high-grade metamorphic rocks have various parent rocks with different intrusive/depositional ages of 728 +/- 8Ma, 727 +/- 3Ma and 231 +/- 4Ma and similar metamorphic ages of 27. 8 similar to 23. 7Ma. Our new results demonstrate that the high-grade metamorphic rocks from the Ailao Shan belt zone are a mixture of metamorphic both igneous and sedimentary rocks of different times, instead of solely Paleoproterozoic basement rocks. Migmatization and metamorphic crystallization of these rocks took place at 27. 8 similar to 23. 7Ma, indicating a significant period of crustal anatexis in the Ailao Shan tectonic belt. The syntectonic felsic dykes hosted by gneiss were derived from a mixture of locally-derived and allochthonous melts. The migmatized rocks from the Ailao Shan deformation zone were most probably the results of decompression melting following peak metamorphism. The crustal anatexis and left-lateral shearing were two synchronous metamorphic patterns resulted from a shared geological event. They interact and influence each other during exhumation of the Ailao Shan metamorphic zone in Late Oligocene. |
| 语种 | 英语 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/17412]  |
| 专题 | 中国科学院紫金山天文台 |
| 推荐引用方式 GB/T 7714 | Wang DongBing,Tang Yuan,Luo Liang,et al. Late Oligocene crustal anatexis and melt/fluid migration in the Ailao Shan tectonic belt: Evidences from zircon U-Pb ages and trace element compositions[J]. ACTA PETROLOGICA SINICA,2017,33(7):2037-2053. |
| APA | Wang DongBing,Tang Yuan,Luo Liang,Liao ShiYong,Yin FuGuang,&Wang BaoDi.(2017).Late Oligocene crustal anatexis and melt/fluid migration in the Ailao Shan tectonic belt: Evidences from zircon U-Pb ages and trace element compositions.ACTA PETROLOGICA SINICA,33(7),2037-2053. |
| MLA | Wang DongBing,et al."Late Oligocene crustal anatexis and melt/fluid migration in the Ailao Shan tectonic belt: Evidences from zircon U-Pb ages and trace element compositions".ACTA PETROLOGICA SINICA 33.7(2017):2037-2053. |
入库方式： OAI收割
来源：紫金山天文台
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