摘要
所研究的毒砂有两个成矿阶段。早期成矿阶段结晶的毒砂不含金,晶体形态为菱形短柱状以及由此组成的双晶;晚期成矿阶段形成的毒砂富含金,晶体形态为长柱状。毒砂成分中Fe/(S+As)>0.5,As/Sb>1000,显微硬度值低于1000kg/mm^2是其含金的标型特征之一。毒砂皆属电子心型半导体,其热电系数与金矿化之间的关系目前尚不十分清楚,但是在同一粒级中,存在着热电系数愈大,含矿性愈好的趋势。
Arsenopyrites were formed in two mineralization stages in the area studied:the early generation is characterized as being rhombus short prismatic or composed of twins, and the late generation is long prismatic in shape. Electron microprobe analysis shows that the early generation is rich in S, Se, Te, Sb, Pb, Zn and Ag, while the late generation is relatively rich in Fe, As, Au, W, Bi and Mo. In arsenopyrites Fe/(S+As)>0.5(atom number) and As/Sb>1000 are also indicative of the presence of Au.The microhardness of arsenopyrites differing in form varies between 833 and 1135.4 kg/mm^2. For the first generation the microhardness is >1000kg/mm^2,and for the late generation it is usually <950 kg/mm^2.Arsenopyrite is an electronic centre-type semiconductor.The grain size of arsenopyrite has some influence on α value. In general,if the size increases by a factor of 1 ,the α value will increase by about 20%. Such a tendency that the larger the α value is,the higher the gold potential would be recognized in the same grain-size fraction.
出处
《矿物学报》
CAS
CSCD
北大核心
1991年第1期70-77,共8页
Acta Mineralogica Sinica
