摘要
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。
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. Analyzed by electron probe, bismuth mainly occurs in the bismuth minerals and bismuth-bearing sulfides, including wittichenite, tetradymite, aikinite, and bismuth-bearing tetrahedrite and bornite. The wittichenite is the major bismuth mineral in the Jiama deposit. It occurs as two occurrences, foliated/xenomorphic granular and dropwise in bornite, chalcocite and tetrahedrite. According to the occurrences and electron probe data, the wittichenite may form in two epochs at short time interval with normal chemical component and lower Bi, higher Cu and S, respectively. Therefore, bismuth in Jiama deposit should be comprehensively utilized, and it is also a significant clue for prospecting of copper mineralization.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2010年第4期801-809,共9页
Journal of Jilin University：Earth Science Edition
基金
中央级公益性科研院所基本科研业务费专项资金项目(K0911)
中金集团重点勘探项目(E0804)
国土资源部地质大调查项目(1212010733803)
国家科技支撑项目(2006BAB01A01)
青藏专项(1212010818089)
关键词
铋矿物
硫铋铜矿
甲玛铜多金属矿床
bismuth minerals
wittichenite
Jiama copper polymetallic deposit
