电子探针在冀东峪耳崖金矿载金矿物研究中的应用

摘要

利用电子探针对矿相显微镜下难以分辨的矿物颗粒进行了微区图像及成分分析.峪耳崖金矿中的载金矿物为黄铁矿、碲铋矿.碲铋矿为本次工作中重点研究的载金矿物.根据矿物组合及矿物形成温度把碲铋矿分为早晚两期.碲铋矿多呈他形粒状,从早期到晚期碲铋矿中Fe元素含量降低而Te、Bi、Ag元素含量升高.利用背散射电子像可清晰地看到碲铋矿中包裹银金矿.通过比较碲铋矿中金的含量与黄铁矿中金的含量,看出碲铋矿中金的含量略高于黄铁矿中金的含量,可将碲铋矿作为找矿标志之一.%The research on gold bearing mineral of the Yuerya gold deposit is carried out by means of the Electron Probe Micro Analysis ( EPMA). Using the EPMA to do the Micro - imaging and composition analysis of small mineral particles which difficult to distinguish under the microscopic observation. The gold bearing mineral of the Yuerya gold deposit are pyrite and tellurobismuthite. And the tellurobismuthite was the first discovered gold bearing mineral in this research work. According to the mineral combination and the forming temperature,we could divided the tellurobismuthite into two phases. The tellurobismuthite present as anhedral granular,and the amount of Fe element decline while the amount of Te、Bi、Ag element increase from early to late. With back scatter electron ( BSE) image analysis we can clearly observe the Phenomenon that the gold associated with the tellurobismuthite. Compared with the amount of gold which carried by pyrite and tellurobismuthite, we could come to the conclusion that the amount of gold carried by tellurobismuthite is greater than the amount of gold carried by pyrite. And we can take the tellurobismuthite as the mark of the ore searching.