微细粒型金矿床金的赋存状态研究——以皖西南枞阳井边金矿为例  

Gold occurrence in the veinlet-impregnated gold deposits --Taking Jingbian gold deposit in the southwestern Anhui Province as an example

作　　者：钱让清[1] 杨晓勇[2] 黄德志[3] 周文雅[4] 

机构地区：[1]安徽大学交通分校,安徽合肥230051 [2]中国科技大学地球与空间科学系,安徽合肥230026 [3]中南大学资源环境与建筑工程学院,湖南长沙410083 [4]安徽省地质实验研究所,安徽合肥230001

出　　处：《中南工业大学学报》2002年第3期225-229,共5页Journal of Central South University of Technology(Natural Science)

基　　金：国家科技部"九五"重点科技攻关项目 (G19990 75 5 0 3 ;A3 0 12 )

摘　　要：通过矿相鉴定、单矿物含金分析、物相分析对皖西南枞阳井边金矿金的赋存状态进行了系统研究 ,并用微束分析技术———质子探针分析方法对超显微形式存在金的赋存状态进行研究 .结果表明 :矿石矿物黄铁矿、黄铜矿中金的赋存状态以微细粒自然金为主 ,其次为银金矿 .金有 2种形式存在 ,一种是显微可见金 ,另一种是超显微形式存在的金 ,其中 ,显微可见金又进一步分为包裹金和裂隙金 ;超显微形式的金也是一种游离金 ,而不是晶格金 。The Jinbian gold deposit lies in the middle part of the Changjiang fault fold upwarding zone within the Lower Yangtze syncline. The gold ore bodies in the irregular vein (dike) forms occur in middle Triassic Tongtoujian Formation. Two major ore types are indentified, i.e., oxidized ore dominated by gold bearing pyrite. By means of ore microscopy, gold analysis of individual minerals, phase analysis, poly spot analysis PIXE and EPMA, occurrences of gold were identified. Gold minerals are mainly native gold, then less commonly as electrum. Gold is very fine in granulites, which is further classified into two types, the main type is medium or fine grained micro gold, another is the ultra micro grained gold. The medium or fine grained micro gold grains can also be classified into two types, one is gold grains included in the different minerals, another is the gold grains confined into in the cranny of the gold carrier minerals. By means of PIXE, the gold under micro diameter grains is distinguished as dissociated gold grains, not as crystal patterns in the gold carrier minerals, which is similar to that of the micro grained Carlin type gold deposits.

关 键 词：细微浸染型金矿 质子探针 电子探针 金赋存状态 枞阳井边 

分 类 号：P618.51[天文地球—矿床学]