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题名: Late Oligocene crustal anatexis and melt/fluid migration in the Ailao Shan tectonic belt: Evidences from zircon U-Pb ages and trace element compositions
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
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17412
Appears in Collections:天体化学和行星科学实验室_期刊论文

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