中文摘要：

夕卡岩型锡矿是芙蓉锡矿最主要的矿化类型。以矿区内19号矿体夕卡岩型矿石为研究对象，利用电子探针定量分析方法，开展矿石的矿物化学研究。结果表明，原生夕卡岩的组成矿物主要为钙铝榴石-钙铁榴石、次透辉石-低铁辉石、铁钙闪石、马来亚石和少量的符山石、硅灰石、锡石，形成于相对较氧化的条件下，与早期侵入的角闪石黑云母花岗岩具有密切的成因联系。锡主要呈Sn^4＋而倾向于进入硅酸盐矿物晶格中。原生夕卡岩在黑云母花岗岩浆演化过程中分异出富F、Cl和成矿物质Sn的热液流体的作用下发生金云母化、透闪石化、绿泥石化等热液蚀变作用，形成金云母＋萤石＋磁铁矿＋锡石矿体（Ⅰ类矿体）和透闪石±透辉石＋绿泥石＋锡石＋硫化物矿体（Ⅱ类矿体）。Ⅰ类矿体的形成主要受到黑云母花岗岩结晶分异的岩浆热液流体控制，而Ⅱ类矿体则受到来自围岩的流体的影响。

英文摘要：

The Furong tin polymetallic deposit in central Nanling region, South China, is composed dominantly of skarn-type ores hosted in Carboniferous and Permian strata and Mesozoic granitic intrusions. In this study, mineral chemistry research has been carried out on skarn ores from the No. 19 ore lode using SEM and EPMA techniques, in order to constrain the tin mineralization conditions of skam rocks in the Furong deposit. Primary skarns in the Furong deposit consist mainly of grossular-andradite, baicalite, ferro-edenite, malayaite, and minus idocrase, wollastonite, cassiterite formed under oxidizing conditions, and have genetic relationship to the hornblende-biotite monzogranite in- truded earlier. In this case, tin dominantly occurred as Sn^4＋ and entered the crystal lattices of skarn minerals. Under the alteration of the F, Cl and Sn-rich ore-forming solution exsolved from biotite granite, the primary skarns were regressively metamorphosed to hydtrothermal minerals and ores. During this stage, substantive cassiterites were precipitated together with phlogopite, fluorite, magnetite, i. e. , type-Ⅰ ores, which are mainly related to the hydrothermal fluids exsolved from biotite granite, or with tremolite, diopside, chlorite, sulphide, i.e. type-Ⅱ ores, which were significantly influenced by the fluid from wallrocks.