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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Sn4+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、C l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。
Skarn tin mine is the most important type of mineralization Furong tin. Taking the No. 19 ore body skarn - type ore in the mining area as the research object, the mineral chemistry of the ore is studied by the method of electronic probe quantitative analysis. The results show that the major components of the primary skarn are mainly composed of goatite - dacite, diopside - low iron pyroxene, feldspar, malayite and a small amount of fursanite, wollastonite, Cassiterite, formed in the relatively oxidizing conditions, is closely related to the early intrusive hornblende biotite granites. Tin is mainly Sn4 + and tends to enter the silicate crystal lattice. In the primary skarn, hydrothermal alteration such as phlogophanation, tremoliticization and chloritization occurs under the action of the hydrothermal fluid that is rich in F, Cl and Sn as the mineralization during the evolution of the biotite granitic magma. , Forming phlogopite + fluorite + magnetite + cassiterite (type I orebody) and tremolite ± diopside + chlorite + cassiterite + sulfide orebody (class Ⅱ ore body). The formation of the type I ore body is mainly controlled by the magmatic hydrothermal fluid which is distinct from the biotite granite. The type II ore body is affected by the fluid from the surrounding rock.