田湾金矿带流体成矿与金成色的关系研究  

Study on the relation of fluid mineralization with gold fineness in Tianwan gold mineral belt

作　　者：滕彦国[1] 张成江[1] 倪师军[1] 吴香尧[1] 李联康[2] 唐建武[1] 

机构地区：[1]成都理工学院 [2]四川地勘局攀西地质大队

出　　处：《黄金》2000年第4期5-7,共3页Gold

摘　　要：田湾成矿带的 1 9个自然金样品的电子探针测试表明 ,该成矿带自然金的成色平均大于 90 0‰ ,成色很高 ;自然金中的杂质元素以Ag、Fe、Cu、Bi为主 ,这与该成矿带金主要赋存于黝铜矿、黄铁矿有关。该区金成色高的原因可能与成矿流体的沸腾不混溶作用造成的突然降温降压从而导致金银的分离有关 ;黝铜矿形成过程对银的消耗造成金银的分离也是该区金成色高的原因之一。另外 ,该区Au (Au +Ag)与Na+ (Na++K+)及CO2 CH4的关系表明 ,Na+ (Na++K+)和CO2 CH4的变化对Au (Au +Ag)的影响较大。According to the determination of the 19 samples of native gold by electroprobe in Tianwan gold mineral belt,the average fineness of the native gold in this belt is higher than 900‰ and the impurity elements in the native gold are mainly Ag,Fe,Cu,Bi, which are related to the fact that the gold are mainly occurred in fahlite and pyrite.The high gold fineness in this belt is possibly related to the truth that the unmixing action of boiled mineralizing fluid cause the sudden heightening of pressure and temperature that lead the separation of silver from gold.The forming of fahlite bring about silver consumption which also cause the separation of silver from gold.It shows from the relations between Au/(Au+Ag) and Na +/(Na ++K +),Au/(Au+Ag) and CO 2/CH 4 that the influence of the variation of Na +/(Na ++K +) and CO 2/CH 4 on Au/(Au+Ag) are great.

关 键 词：成色 成矿流体 田湾金矿带 自然金 

分 类 号：P618.51[天文地球—矿床学]