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- W3205780949 abstract "The mechanism by which amphibole-dominated differentiation controls the redox state and water content of derivative melt was explored through petrographic studies and in situ major- and trace-element and Sr–Nd isotope analyses of apatites from amphibole-rich cumulate xenoliths and their porphyry hosts in the Tongling ore cluster, China. Apatite is typically dominated by F-rich components, with increasing OH and SO3 contents from primitive cumulates to evolved porphyry hosts. Chondrite-normalised rare-earth-element (REE) patterns of apatites are right-inclined with strong light REE enrichment; the negative Eu anomaly is more pronounced in apatites from porphyry hosts than in those from cumulates. Plagioclase crystallisation prior to apatite is a predominant factor controlling the contrasting differences in the REE contents and patterns and the Sr contents of apatites. We conclude that amphibole-dominated magma differentiation has only weak effects on the redox state of the melt but can efficiently increase the water content of derivative melt; the oxidised nature of the porphyries is inherited from their source. In porphyry Cu mineralisation systems, deep accumulation processes may offset metal loss incurred through sulphide saturation as its function in increasing the water content of evolved melts." @default.
- W3205780949 created "2021-10-25" @default.
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- W3205780949 date "2021-12-01" @default.
- W3205780949 modified "2023-10-17" @default.
- W3205780949 title "Redox state and water content changes of magma during amphibole accumulation process: Tongling example" @default.
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- W3205780949 doi "https://doi.org/10.1016/j.oregeorev.2021.104523" @default.
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