内蒙拜仁达坝银铅锌多金属矿床地质特征  

Geological characteristics of Bairendaba Ag-Pb-Zn polymetallic ore deposit in Inner Mongolia

作　　者：王力[1] 孙丰月[1] 

机构地区：[1]吉林大学地球科学学院,长春130061

出　　处：《世界地质》2008年第3期252-259,共8页World Geology

基　　金：全国危机矿山接替资源找矿项目(200623018)

摘　　要：经详细的光、薄片鉴定和电子探针分析,认为该矿床矿石组成比较复杂,主要为磁黄铁矿、方铅矿、铁闪锌矿、毒砂、黄铁矿、银黝铜矿和黄铜矿等,其次还有闪锌矿、辉银矿、自然银、黝锡矿、硫锑铅矿、胶状黄铁矿、铅矾、褐铁矿和孔雀石等。其中银黝铜矿,黝锡矿和硫锑铅矿是本次工作新鉴定出的矿物。结合成矿地质特征、矿物共生组合特点和矿物间的穿插关系,将该矿床的成矿作用划分为热液成矿期和表生氧化期。热液期又可划分出4个成矿阶段:Ⅰ.毒砂-黄铁矿-石英阶段,该阶段矿化较弱;Ⅱ.石英-闪锌矿-磁黄铁矿阶段,该阶段矿化范围大,强度大,是锌的主成矿阶段,并伴随少量的银矿化;Ⅲ.银多金属硫化物阶段,该阶段是该区最重要的银铅锌成矿阶段;Ⅳ.碳酸盐-萤石-玉髓阶段,该阶段在矿区内分布广泛,矿化不发育,属成矿的尾声。结合测温研究确定该矿床是受断裂构造控制的中温热液矿床。Based on the microscopic study on transparent and polished thin sections and electronic probe analysis for different minerals,it has been realized that the main ore mineral assemblages consist of pyrrhotite,galena,marmatite,arsenopyrite,pyrite,freibergite,chalcopyrite with minor amount of sphalerite,argentite,native silver,stannine,boulangerite,colloform pyrite,anglesite,limonite,malachite,etc.Among them,freibergite,stannine,boulangerite are first discovered in this ore district by the authors.Combined with ore-forming characteristics,mineral assemblages,and mineral cross cutting,two mineralizing periods,i.e.hydrothermal and supergene ones,are identified.There are four mineralizing stages in the hydrothermal period,includingⅠ.arsenopyrite-pyrite-quartz stage that is of minor significance for mineralization;Ⅱ.quartz-spheralite-pyrrhotite stage that is extensively developed and is an important stage for zinc with minor silver;Ⅲ.silver-polymetallic mineral stage that is most important epoch for silver,lead,and zinc;Ⅳ.carbonate-fluorite-chalcedony stage,representing the end of the hydrothermal activity,which is widely distributed in the ore district with minor industrial significance.It is suggested that Bairendaba Ag-Pb-Zn polymetallic ore deposit belongs to mesothermal deposit controlled by fractures.

关 键 词：内蒙 拜仁达坝 矿物组成 成矿期次 

分 类 号：P618.4[天文地球—矿床学]