Geochronology and magma oxygen fugacity of Ehu S-type granitic pluton in Zhe-Gan-Wan region,SE China |
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| Institution: | 1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;2. Department of Structure Engineering, Hefei University of Technology Xuancheng Campus, Xuancheng 242000, China;3. Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Private Bag 79, Hobart, Australia;4. Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia |
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| Abstract: | In this paper, we determined the U-Pb isotopic and trace element compositions of zircons from the Ehu S-type granite in the Zhe-Gan-Wan region, SE China, using in-situ laser ablation (LA) ICP-MS. The weighted mean 206Pb/238U age of 132.0 ± 0.6 Ma for the Ehu granite indicates that the pluton was formed in the Early Cretaceous and during the Late Mesozoic Cu-Mo mineralization quiescence in Zhe-Gan-Wan region. The calculated logarithmic magma oxygen fugacities for Ehu granite range from −19.19 to −11.43 with an average magma oxidation state of FMQ-0.29, which is much lower than those of Cu-Mo bearing granites in the Zhe-Gan-Wan region. Since Ehu granite was derived from partial melting of metasedimentary basement without fractional crystallization and mantle-derived magma contamination, the low oxidation state of this granite suggests that the assimilation of metasedimentary basement component may not significantly increase the oxidation state of reduced melts from asthenospheric mantle and could not generate oxidized magmas that are favorable for Cu-Mo mineralization. |
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| Keywords: | Magma oxygen fugacity Zircon Ehu pluton Cu-Mo mineralization Zhe-Gan-Wan region |
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