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通过显微镜、扫描电镜(SEM/EDS)、电子探针(EPMA)等研究手段,对赣南茅坪钨矿伟晶岩型矿石中的云母开展了详细的矿物学研究。研究结果表明:这类云母具有富Al、K、Li,贫Mn、Ta、Mg、Ca,挥发性组分F质量分数较高等特征;随着岩浆演化,茅坪伟晶岩中的云母成分发生变化,由富锂多硅白云母向铁锂云母方向演化;茅坪伟晶岩中的云母经历了岩浆—热液过渡阶段,因受后期热液的交代作用普遍发育复杂环带结构;另外,伟晶岩中的云母具有高F的特征,说明体系中F的质量分数很高,在岩浆演化过程中,F趋向于在残余岩浆中富集,这有利于岩浆的高度演化和稀有金属的富集。
A detailed mineralogical study of mica in pegmatite ore of the Maoping tungsten deposit in southern Jiangxi Province has been carried out by means of microscopy, scanning electron microscopy (SEM / EDS) and electron probe (EPMA). The results show that these micas are rich in Al, K and Li, poor in Mn, Ta, Mg and Ca, and have higher F mass fraction. With the magmatic evolution, the mica composition in the pegmatite rocks The mica in the Maoping pegmatite experienced a magmatic-hydrothermal transitional stage, and the complex zonal structure was generally developed due to the metasomatism of later hydrothermal fluids. In addition, The mica in pegmatite has the characteristics of high F, indicating that the mass fraction of F in the system is very high. During the magmatic evolution, F tends to be enriched in the residual magma, which is beneficial to the evolution of magma and enrichment of rare metals set.