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• W4205876156 endingPage "104690" @default.
• W4205876156 startingPage "104690" @default.
• W4205876156 abstract "The contribution of magmatic and hydrothermal processes to the formation of rare metal minerals in highly-evolved peraluminous systems has received great attention, yet is still debatable. The Ta-Nb-W-Sn mineralization at the Jianfengling deposit, in the Nanling range of Southeast China, occurs in a peraluminous intrusion that comprises three rock phases, namely a biotite granite, a zinnwaldite granite, and a topaz zinnwaldite granite from bottom to top. Rare metal ores occur as disseminations constrained to the zinnwaldite granite and topaz zinnwaldite granite. In this study, textural and chemical analyses of Ta-Nb-W-Sn ore minerals and zinnwaldite were conducted to address the origin of rare metal mineralization in the context of the magmatic-hydrothermal evolution at Jianfengling. Four stages of mineralizing events were identified. The Stage-I mineralization is represented by columbite-(Mn) that occurs mainly as cores overgrown by aggregates of Ta-Nb-Sn-W oxides, but also as individual crystals. The Stage II is represented by CGM overgrowths that have partially resorbed or replaced the Stage-I columbite-(Mn). The Stage-II overgrowths are much more enriched in Ta than the Stage-I columbite-(Mn). Cassiterite manifests the Stage-III mineralizing event, and occurs as replacement of or overgrowths on the Stage-II CGM aggregates. The Stage-IV mineralization is characterized by formation of wolframite that has replaced and/or overgrown on the Stage-II and –III minerals. The equilibrium boundaries shown between Stage-I columbite-(Mn) and magmatic zinnwaldite, and the gradual or no compositional zoning that the Stage-I columbite-(Mn) cores exhibit, suggest that the Stage-I CGM is magmatic. Because of the low solubility of Ta in aqueous fluids and the evidence for metasomatism observed in this study, the Ta-rich Stage-II CGM overgrowths were interpreted to have crystallized from a magmatic-hydrothermal, transitional fluid (i.e., hydrosilicate liquid) that lies compositionally in between silicate melts and aqueous fluids, and which was able to cause significant Ta enrichment, and in turn a strong decrease of the whole-rock Nb/Ta values. That the Stage-II CGM were sequentially replaced by cassiterite and wolframite marked a metasomatic Sn-W mineralizing event that postdated Ta-Nb mineralization. Fluids responsible for this Sn-W mineralization could be a compositionally evolved fluid derived from the same transitional fluid that led to metasomatic Ta-Nb mineralization, or infiltrating fluids that precipitated Sn and W, respectively." @default.
• W4205876156 created "2022-01-25" @default.
• W4205876156 creator A5000238995 @default.
• W4205876156 creator A5006007095 @default.
• W4205876156 creator A5055508653 @default.
• W4205876156 creator A5085995001 @default.
• W4205876156 date "2022-03-01" @default.
• W4205876156 modified "2023-10-01" @default.
• W4205876156 title "Textural features and chemical evolution of Ta-Nb-W-Sn oxides in the Jianfengling Deposit, South China" @default.
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