云南镇康芦子园铅锌矿矿物成分及矿物嵌布特征

Composition and Dissemination Characteristics of the Main Minerals of Luziyuan Pb-Zn Deposit in Zhenkang area,Yunnan Province,China

芦子园铅锌矿是近年来新发现的大型铅锌多金属矿床。已发现20多种矿物,金属矿物以闪锌矿、方铅矿、黄铜矿为主,脉石矿物以蔷薇辉石、方解石、石英等为主,脉石矿物总量高达89.04%。通过原矿X射线荧光光谱半定量分析、物相分析及扫描电镜分析等,综合分析原矿性质、矿物组成、有益元素赋存状态与主要矿物嵌布特征。结果显示,矿石中有益元素铜赋存在黄铜矿和黝铜矿及斑铜矿中,铅主要赋存在方铅矿中,锌主要赋存在闪锌矿中。矿石中大部分金属硫化物呈它形不规则状集合体,黄铜矿与方铅矿、闪锌矿等金属硫化物密切共生。闪锌矿与方铅矿、黄铜矿与闪锌矿等的嵌布关系非常复杂,边界极不规则,且常常相互包裹,矿物工艺粒度较细,单体解离困难。闪锌矿中可见固溶体分离结构的细小粒状黄铜矿嵌布,这种形式嵌布的黄铜矿一般无法解离。

Luziyuan Pb-Zn deposit is a newly discovered large-size Pb-Zn polymetallic ore deposit in recent years.More than 20 kinds of minerals have been found; the main metal minerals are sphalerite,galena and chalcopyrite,and the gangue minerals are mainly rhodonite,calcite,quartz and so on,with the total amount of gangue minerals as high as 89. 04%. Ore property,mineral composition,occurrences forms of valuable elements and dissemination characteristics of Luziyuan Pb-Zn deposit were analyzed comprehensively by semi quantitative analysis of X ray fluorescence spectra of raw ore,phase analysis and scanning electron microscopy analysis. Results show that Cu can be concentrated in chalcopyrite,tetrahedrite,and bornite; Pb is mainly contained in galena,and Zn mainly exists in sphalerite. Their dissemination characteristics show that most metal sulfides in the ore are irregular aggregates;chalcopyrite is often closely associated with galena,sphalerite and other metal sulfides. The relationships between sphalerite and galena,chalcopyrite and sphalerite are very complex; the boundary is extremely irregular,and often wrapped each other. Grain size of mineral is fine,and it was difficult to dissociate. The fine distributed chalcopyritefills in the void spaces between sphalerite aggregates as solid solution separation structure,so chalcopyrite is unable to dissociate.