皖中沙溪地区沙湖山金铅锌矿床金的赋存状态研究

发布时间：2018-12-09 11:56

【摘要】：为探讨皖中沙湖山金铅锌矿床矿体中金的赋存状态及其分布形式,对一号矿体的矿石开展了电子显微镜背散射图像观察和能谱分析,以及钻孔岩心多元素含量分析。结果表明,54勘探线2个钻孔中的矿物组合及金的赋存状态均存在一定差异。ZK5403钻孔中矿物组合为黄铁矿、闪锌矿-方铅矿、毒砂-石英,其中Au可能以超微米级或者纳米级的碲化物形式分布于黄铁矿-闪锌矿-方铅矿中,最晚期的毒砂中不含金。而ZK5404中的金矿体则发育在泥质粉砂岩中的黄铁矿细脉中,矿物组合为黄铁矿-石英,基本不含铅锌矿;Au则以显微可见的微米级碲化物形式分布于黄铁矿粒间或包裹于黄铁矿内部。根据金银碲化物的存在,认为成矿热液应为中低温,且具有较高的碲逸度和较低的硫逸度。
[Abstract]:In order to study the occurrence and distribution of gold in the orebody of Shahushan gold-lead-zinc deposit in central Anhui province, electron microscope backscatter image observation, energy spectrum analysis and multi-element content analysis of borehole core were carried out for the ore of No. 1 ore body. The results show that there are some differences in mineral assemblages and gold occurrence in the two boreholes in the exploration line 54. The mineral assemblages in the ZK5403 borehole are pyrite, sphalerite galena, arsenopyrite quartz, etc. Au may be distributed in the form of ultramicron or nanoscale telluride in pyrite sphalerite galena and no gold is found in the most advanced arsenopyrite. The gold deposit in ZK5404 is developed in the pyrite vein of argillaceous siltstone, and the mineral assemblage is pyrite-quartz, and there is basically no lead and zinc ore. Au is distributed in the form of micrometer telluride in the form of pyrite particles or wrapped in the pyrite interior. According to the existence of gold and silver telluride, the ore-forming hydrothermal solution should be medium and low temperature, with higher tellurium fugacity and lower sulfur fugacity.
【作者单位】：安徽省地质矿产勘查局327地质队;中国科学技术大学中国科学院壳幔物质与环境重点实验室;武警黄金第七支队;
【基金】：国家自然科学基金项目(41372087) 中国博士后科学基金(2015M582003)
【分类号】：P618.51;P618.4

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