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边家大院铅锌银多金属矿床位于大兴安岭成矿带中南段,是近几年来新发现的矿石品位较高的铅锌银多金属矿床。详细的显微镜下鉴定及电子探针分析表明,矿床的金属矿物主要为方铅矿、闪锌矿、黄铁矿、黄铜矿、磁黄铁矿、毒砂、黝锡矿等,含银的矿物主要为银锑黝铜矿、黝锑银矿及深红银矿。此外,矿区还发现大量针硫锑铅矿,与其共生金属矿物主要为方铅矿、黄铜矿、黝锑银矿等。针硫锑铅矿主要呈长柱状、针状、束状和不规则粒状等,粒度变化较大,一般为5~150μm。电子探针分析结果表明,其相应的平均化学分子式为(Pb4.77Cu0.05Fe0.04Zn0.06)4.92Sb3.91S11.00,简写为Pb5Sb4S11。针硫锑铅矿一般是成矿晚期低温作用的产物,边家大院铅锌银多金属矿床中针硫锑铅矿的形成,与成矿温度较低、硫逸度升高以及还原作用等密切相关。
The Bianjiatuan Lead-Zinc-Silver polymetallic deposit is located in the central-southern section of the Daxinganling metallogenic belt and is a newly discovered lead-zinc-silver polymetallic deposit of high ore grade in recent years. Detailed microscopic identification and electron probe analysis showed that the metallogenetic mineral deposits in the deposit are mainly galena, sphalerite, pyrite, chalcopyrite, pyrrhotite, arsenopyrite, and stannous The main minerals are silver antimony tetrahedrite, arsenic silver mine and deep red silver mine. In addition, the mine also found a large number of pin-stibnite, with its symbiotic metal minerals are mainly galena, chalcopyrite, antimony silver and so on. Needle stilaminite is mainly long columnar, needle-like, beam-like and irregular granular, larger particle size changes, usually 5 ~ 150μm. Electron probe analysis results show that the corresponding average chemical formula is (Pb4.77Cu0.05Fe0.04Zn0.06) 4.92Sb3.91S11.00, abbreviated as Pb5Sb4S11. Pin thionite is generally the product of the late mineralization, and the formation of pinaceous stibnite in the Bianjiaduan Pb-Zn-Ag polymetallic deposit is associated with the low metallogenic temperature, the increase of sulfur fugacity, and the reduction effect closely related.