云南墨江金厂金矿床黄铁矿标型特征研究

黄铁矿在云南墨江金厂金矿床中广泛出现于蛇纹岩、黄铁铬绢英岩、硅质岩和石英脉中。通过对与黄铁矿成因产状密切关联的热液演化阶段的划分、黄铁矿的晶形统计、黄铁矿的热电性研究、黄铁矿的电子探针分析、黄铁矿所赋存的含金岩矿石标本中金品位化学分析，确定了与成矿物质来源——金厂蛇纹岩化镁质超基性岩、硅质岩和可能隐伏的酸性侵入岩有关的系列成因标型。在对黄铁矿热电标型的均方差参数的自然对数值(lnMp)与金品位自然对数值(lnTg)的相关性研究基础上，提出当lnMp值接近4．1时，金的品位值接近二业开采标准。金厂金矿体与镍矿体尽管空间上分离，但近镍矿体与富金石英脉中黄铁矿的共生元素组成成分表明金、镍矿体中部分矿质具有同源同期的特征。此外，全厂组硅质岩和可能的隐伏岩体在成矿物源和热源方面的贡献不容忽视。

THE TYPOMORPHISM OF PYRITE OF JINCHANG GOLD DEPOSIT IN MOJIANG COUNTY,YUNNAN PROVINCE

Pyrite occur in different rocks,including pyritic chrome-phyllic rock, chert, ophiolite and quartz vein in the Jinchang gold deposit in Mojiang county, Yunnan.Based on the classification of the thermal fluid evolution stages, the crystal habits, thermoelectricity and electron microprobe analysis of pyrite, and the gold content of the rock,we set up a series of genetic typomorphic characteristics which are well related with the resource rocks--serpentized Mg-ultrabasic rockbody, chert and buried acidic intrusive rocks.Based on the study on the plot between the natural logarithm data of MSDTC(Mean Standardized Difference of Thermoelectricity Coefficient) and that of gold content, we found a nearly negative linear correlation between lnMp and lnTg. Accordingly, we conclude that if the lnMp value is close to 4.1, the gold content will reach the industrial standard for gold mining. Moreover, although the nickel orebody is separated from the gold body, the elemental associations pyrite samples in the near Ni orebody area and the rich-gold quartz vein share the similar feature. Therefore we can extrapolate that the ore-forming fluid whisch are essential for the formation of gold and nickel are derived from the same resources,and formed in the same period..