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Late Oligocene crustal anatexis and melt/fluid migration in the Ailao Shan tectonic belt: Evidences from zircon U-Pb ages and trace element compositions
Wang DongBing1; Tang Yuan1; Luo Liang1; Liao ShiYong2; Yin FuGuang1; Wang BaoDi1
2017-07-01
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume33Issue:7Pages:2037-2053
Corresponding AuthorWang DongBing(wangdb06@163.com)
AbstractThe 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.
KeywordCrustal anatexis Melt/fluid migration High-grade metamorphic rocks Zircon U-Pb dating Ailao Shan tectonic belt
WOS KeywordRIVER SHEAR ZONE ; ARC/BACK-ARC ASSEMBLAGES ; PALEO-TETHYS OROGEN ; PLATE IGNEOUS ROCKS ; RED-RIVER ; METAMORPHIC ROCKS ; SOUTHWEST CHINA ; DIANCANG SHAN ; GEOLOGICAL IMPLICATIONS ; SOUTHEASTERN TIBET
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000408702200005
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22689
Collection中国科学院紫金山天文台
Corresponding AuthorWang DongBing
Affiliation1.China Geol Survey, Chengdu Ctr, Chengdu 610081, Sichuan, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
Recommended Citation
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.
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