西藏甲玛铜多金属矿床中铋矿物及其与铜矿化关系

西藏墨竹工卡县甲玛铜多金属矿床中,矽卡岩型铜矿石的铋质量分数最高可达0.23%,且分布较广泛,可作为伴生有用组分综合回收利用.根据化学分析,铋含量的高低与矿石类型有关.铋与矽卡岩型铜矿石的关系最为密切,铜矿化越强,铋含量越高.在垂向上,中浅部矽卡岩型矿体中的铋含量高于深部的矽卡岩,与矿化分带中的Cu元素矿化带较一致.通过电子探针分析,甲玛矿床中含铋矿物主要有硫铋铜矿、辉碲铋矿、针硫铋铅矿、针辉铋铜矿、辉铋锑矿及含铋黝铜矿和斑铜矿等.硫铋铜矿是甲玛矿床中分布最广、最主要的铋矿物,其主要呈它形粒状、叶片状或乳滴状分布于斑铜矿、辉铜矿、黝铜矿等硫化物中.根据矿物的产出形态及电子探针分析,甲玛矿床中存在不同成矿世代的硫铋铜矿:分布于斑铜矿中呈它形粒状、叶片状的硫铋铜矿和在斑铜矿中呈乳滴状的硫铋铜矿.前者是硫铋铜矿的主要产出形态,其成分接近硫铋铜矿的理论值;但后者往往成分发生变化,Bi偏低,Cu、S偏高.甲玛矿石中铋不仅应该被综合利用,且是铜矿化的重要找矿标志.

Bismuth Minerals and Its Relationship with Copper Mineralization in the Jiama Copper Polymetallic Deposit,Tibet

The bismuth minerals in the skarn-type copper ore of the Jiama copper polymetallic deposit in Mozhugongka County, Tibet, has reached 0.23%, and can be used as an associated useful metal element. Based on the geochemical analyses, bismuth is closely correlated to the skarn and copper mineralization. The bismuth content is relatively higher in the skarn copper ore than those in other ores. In the vertical section, bismuth has concentrated in the same zone as copper of the vertical mineralization zoning. Analy...