SHRIMP U-Pb zircon age,geochemistry and Nd isotope of the Guandaoshan pluton in SW Sichuan: Petrogenesis and tectonic significance |
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| Authors: | Li Xianhua Li Zhengxiang Zhou Hanwen Liu Ying Liang Xirong Li Wuxian |
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| Institution: | 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,China;2.Tectonics Special Research Centre, School of Earth and Geographical Sciences,The University of Western Australia,Crawley,Australia;3.Faculty of Earth Sciences,China University of Geosciences,Wuhan,China |
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| Abstract: | SHRIMP U-Pb zircon age, geochemical and Nd isotopic data are reported for the Neo-proterozoic Guandaoshan pluton in the Yanbian region, SW Sichuan. This pluton is of typical I-type granite and emplaced at (857 ± 13) Ma. Geochemical and Nd isotopic characters suggest that the pluton was generated by partial melting of pre-existing, young (late Mesoproterozoic to early Neo-proterozoic) low-K tholeiitic protolith within an intraplate anorogenic setting. The Guandaoshan pluton probably records the earliest magmatism induced by the proposed ca. 860–750 Ma mantle superplume beneath the supercontinent Rodinia. |
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