• 责任者：Li Jie (State Key Laboratory of Isotope Geochemistry ; Guangzhou Institute of Geochemistry ; Chinese Academy of Sciences ; Guangzhon 510640 ; China) ; Huang Xiaolong
• 刊名：Acta Petrologica Sinica
• 出版年：2013
• 卷期：29(12)
• 关键词：钽矿 ; tantalum ores ; 铌矿 ; niobium ores ; 花岗岩 ; granite ; 江西 ; Jiangxi Province
• 页码：p.4311-4322
• 图表：8 illus., 3 tables, 51 refs.
• 分类号：1001
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

     The Yashan granites are typical rare-metal granites in South China and famous for enriched tantalum-niobium deposit. From early to late units of the Yashan granites, the micas varied in the types of ＂protolithionite→Li-mica→lepidolite＂ corresponding to increasing Li, F and Rb2O concentrations. The proportion of Zr substituted by other elements （e.g., Hf, U, Th, Y and P） in the zircons was also elevated during magmatic evolution. The variations of micas and zircons are consistent with the whole rock geochemical trends of decreasing Zr/Hf and Nb/Ta ratios but increasing F, Li and P2O5 contents in the Yashan granites, indicating that both the micas and zircons could be as indicators of the extent of magmatic evolution. Ta and Nb were gradually concentrated in the rocks during magmatic evolution because the non-bridging oxygens （NBOs） generated by F, Li and P would promote the dissolution of niobium and tantalum in the melts, so the latest unit of topaz-lepidolite granites has the highest Ta and Nb. Therefore, high concentrations of F, Li and P2O5 are important for Ta-Nb enrichment and magmatic evolution in the Yashan granites. The micas in the Xihuashan granites contain lower F, Li and Rb2O than the lepidolite in the Yashan granites, indicating that the extent of evolution in the Xihuashan granites is less than that in the Yashan granites. The enrichment of tungsten in the Xihuashan granites was closely related to fluid activity. The decline of oxygen fugacity in the melts also triggered the deposit of tungsten in the Xihuashan granites. Therefore, the extent of magamtic evolution would be important mechanism of diverse mineralizations （e.g., Ta-Nb deposit and tungsten deposit） in the rare-metal granites in South China.