湘西沃溪钨锑金矿床超纯自然金  

SUPER-PURE NATIVE GOLD IN W-Sb-Au ORES FROM THEWOXI DEPOSIT IN WESTERN HUNAN PROVINCE,CHINA

作　　者：彭渤[1] Adam Piestrzynski 陈广浩[1] 

机构地区：[1]中国科学院长沙大地构造研究所,湖南长沙410013 [2]University of Mining and Metallurgy

出　　处：《大地构造与成矿学》2000年第1期51-56,共6页Geotectonica et Metallogenia

基　　金：中国科学院创新工程黄金科研课题

摘　　要：湘西沃溪钨锑金矿床产有自然界中十分罕见的超纯自然金。超纯自然金的Au含量在99 %以上 ,Fisher成色接近1000。自然金中含有Ag、Pb、Zn、Cu、As、Sb、Hg、Bi等显微化学组分。与一般自然金相比 ,超纯自然金的Ag 含量显著偏低 ,而Pb、Zn、As、Sb、Hg、Bi等显微化学组分含量趋于偏高 ,且较稳定。理论分析表明 ,超纯自然金的形成与强氧化性的酸性成矿流体有关。流体中金、银主要以MeCl2-(Me=Au或Ag)的络合物形式迁移。推断矿床成矿可能与区域中酸性岩浆活动有成因联系。The super-pure native gold has been identified out from the W-Sb-Au ores at the Woxi deposit in western Hunan Province,China.Results from microprobe analysis show that the super-pure native gold contains microchemical composition including elements Ag,Pb,Zn,Cu,As,Sb,Hg and Bi,with Au content more than 99 percent and Fisher fineness from 997.7 to 1000.Such kind of super-pure native gold can not be found in nature.Compared to the native gold found in other places,the Ag of the super-purenative gold is extremely low,while the contents of Pb,Zn,As,Sb,Hg and Bi in thesuper-pure native gold are relatively high.Theoretically,a favorable condition for deposition/formation of the super-pure native gold probably is under a strong oxidized acid condition in which gold and silver was transferred in forms of Me Cl2- (Me=Au or Ag).It can be deduced that gold mineralization at the Woxi deposit might be closely related to the magmatic fluids associated with the regional magmatic activities.

关 键 词：超纯自然金 显微化学组分 金矿床 钨矿床 锑矿床 

分 类 号：P618.510.4[天文地球—矿床学] P618.670.4[天文地球—地质学]