Redox state of amphibole-bearing mantle peridotite from Nüshan, Anhui Province in eastern China and its implications |
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Authors: | Jianping Li and Sheng Zhang |
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Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) State Key Laboratory of Department of Earth Sciences, Nanjing University, 210093 Nanjing, China |
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Abstract: | Using secondary spinel standard method, we have measured precisely the compositions of spinels of amphibole-bearing mantle
peridotite xenoliths from Nüshan in eastern China, and calculated the mantle oxygen fugacities recorded by the xenoliths.
Results indicate that the mantle metasomatism for forming amphiboles in Nüshan region of Anhui has resulted in the decrease
of mantle redox, which is in contrast with theoretical estimation and previous research results from other areas around the
world. Combining with related studies on the mantle of eastern China, we give a reasonable explanation to the ‘new finding’
and further elucidate the compositions and nature of mantle fluids in eastern China. |
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Keywords: | Nüshan of Anhui in eastern China mantle metasomatism mantle amphibole mantle C— O— H fluids mantle redox state |
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