Mantle Redox State Evolution in Eastern China and Its Implications |
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作者姓名: | LI Jianping and WANG Jian Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Liu Shuchun Zhu Xiling |
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作者单位: | LI Jianping and WANG Jian Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640 Liu Shuchun Zhu Xiling |
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摘 要: | Using the secondary spinel standard, the authors have precisely measured the Fe3+/∑ Fe values of spinels in mantle xenoliths from Cenozoic basalts in eastern China, and estimated the oxygen fugacities recorded by 63 mantle xenoliths through olivine-orthopyroxene-spinel oxygen barometry. The results indicate that the oxygen fugacities of the lithospheric mantle in eastern China are higher in the south than in the north. Among them, the oxygen fugacity of the North China craton lithospheric mantle is the lowest, similar to that of the oceanic mantle, while that of Northeast and South China are the same as that of the global continental mantle. The variations of mantle redox state in eastern China are mainly controlled by the C-O-H fluids derived from the asthenospheric mantle. According to the mantle oxidation state, it can be concluded that the C-O-H fluids in the lithospheric mantle of eastern China consist mainly of CO2 and minor H2O, but CH4-rich fluids should come from the asthenosphere where the ox
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Mantle Redox State Evolution in Eastern China and Its Implications |
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Authors: | LI Jianping and WANG Jian Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou Liu Shuchun Zhu Xiling |
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Abstract: | Abstract Using the secondary spinel standard, the authors have precisely measured the Fe3+/Σ Fe values of spinels in mantle xenoliths from Cenozoic basalts in eastern China, and estimated the oxygen fugacities recorded by 63 mantle xenoliths through olivine‐orthopyroxene‐spinel oxygen barometry. The results indicate that the oxygen fugacities of the lithospheric mantle in eastern China are higher in the south than in the north. Among them, the oxygen fugacity of the North China craton lithospheric mantle is the lowest, similar to that of the oceanic mantle, while that of Northeast and South China are the same as that of the global continental mantle. The variations of mantle redox state in eastern China are mainly controlled by the C‐O‐H fluids derived from the asthenospheric mantle. According to the mantle oxidation state, it can be concluded that the C‐O‐H fluids in the lithospheric mantle of eastern China consist mainly of CO2 and minor H2O, but CH4‐rich fluids should come from the asthenosphere where the oxidation state is lower. |
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Keywords: | mantle xenoliths from eastern China lithospheric mantle asthenospheric mantle redox state mantle C-O-H fluids |
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