摘要
本文总结了金矿床中毒砂的基本标型特征,并从地球化学角度阐述了金在毒砂中富集的机理,解释了同一金矿床中毒砂含金量比黄铁矿高,以及毒砂中常常出现晶格金的原因.
Arsenopyrite is a important auriferous sulfide. It exsits in either disseminated or veinly in the gold deposit. The auriferous arsenopyrite show columnar or needlely, smaller reflectance and larger density than standard arsenopyrite. Thermoelectricity coefficients of the auriferous arsenopyrite arc negative as N-type electric conductivity. The auriferous arsenopyrite show deficiency of arsenic atom and excess of sulfur atom, Fe/As+S<0.5 (atom ratio) in their chemical formalas. Arsenopyrite has enrich trend of gold based on its trace element analysis. Geochemistry suggests that the arsenopyrite crystallize early than the pyrite do. The former reduce gold complex compound within crystallizing process. The atom radius of arsenic is similar to that of gold. Therefore, the reason of more gold contents for arsenopyrite that for pyrite and of commonly gold as solid solution in crystal lattice of arsenopyrite can be explained well.
出处
《火山地质与矿产》
1992年第4期65-70,共6页
Volcanology & Mineral Resources
关键词
毒砂
标型特征
金矿床
地球化学
Arsenopyrite Gold deposit Typomorphic Peculiarities
