摘要
浙西开化石龙头金矿是微细粒浸染型金矿床,金矿化赋存于新元古界地层的构造碎裂蚀变带中。通过光学显微镜观察以及电子探针、扫描电镜等实验测试对石龙头金矿的矿石和主要载金矿物进行测试分析,结果表明,石龙头金矿床中的主要含金矿物为黄铁矿,毒砂,其次为少量的脉石英。岩屑中的石英、白云石和粘土矿物不含金。主要载金矿物黄铁矿和毒砂的平均含金量分别为181×10-6和207×10-6。金主要以显微可见金的形式存在,其次为次显微不可见金。显微可见金主要以包裹金的形式赋存在黄铁矿晶体中或晶体边缘,次显微不可见金在黄铁矿中以纳米级金颗粒存在,在毒砂中主要以固溶体金形式存在。
Shilongtou gold deposit of Kaihua in west of Zbejiang belongs to fine grained disseminated ore type. Gold mineralization occurred in tectonic fragmented alteration zone of the Neoproterozoic strata. The mineral compositions of ore rocks and major gold-bearing minerals were investigated by using petrographic observations, electron probe and scanning electron microscopy. It shows that the major gold-bearing minerals are pyrite and arsenopyrite,with minor vein quartz, whereas, gold has not been detected in quartz, dolomite and clay minerals. Anaysis reveals that average gold content of pyrite and arsenopyrite are 181 × 10^-6 and 207 × 10^-6 , respectively. Visible micrometer-size gold is dominant,with minor invisible nanometer-size gold. The former occurs in pyrite crystals or crystal edge in the form of inclusion gold grains,and the latter displays as nano particles of native gold in the pyrite and solid solution in arsenopyrite.
出处
《矿物岩石》
CAS
CSCD
北大核心
2014年第3期30-39,共10页
Mineralogy and Petrology
基金
国家自然科学基金项目(Nos.41012030
40872038)
高等学校博士学科点专项科研基金资助课题(No.20110145110001)
关键词
石龙头金矿
含金性
黄铁矿
毒砂
显微金
次显微金
Shilongtou gold deposit
gold-bearing property
pyrite
arsenopyrite
microscopic visible gold
submicroscopic gold
