招远、莱州地区金矿床黄铁矿的标型特征及黄铁矿中金的赋存状态

TYPOMORPHIC CHARACTERISTICS OF THE PYRITES IN THE GOLD DEPOSITS AND THE MODE OF OCCURRENCE OF GOLD IN THE PYRITES IN THE ZHAOYUAN-LAIZHOU AREA

摘要:

招远、莱州地区金矿床黄铁矿的标型特征及黄铁矿中金的赋存状态的研究,采用了化学成分分析、电子探针成分分析、透射电镜分析、物相分析、晶胞参数测定、热电系数测定、比重硬度测定、粒度测定等多种物理化学手段。初步探讨了黄铁矿与金矿成矿的关系,并归纳出以下特征,可作为找矿标志:一是裂隙发育,结构疏松不规则的碎块状及五角十二面体、八面体、立方体黄铁矿含金高,与金关系密切。二是金矿中黄铁矿热电系数为正值,热电场为空穴型及电子—空穴型两种。三是金矿中黄铁矿晶胞参数大、比重低、硬度低、反射率低者含金量高。四是黄铁矿的主要成分S、Fe偏低,杂质元素Au、Ag、As、Sb、Bi、Co、Ni等微量元素较高,是含金黄铁矿成分特征。五是在金矿中黄铁矿是主要载金矿物,有80％以上的金与黄铁矿有关。查明金主要呈独立矿物赋存在黄铁矿中。另外在黄铁矿中还有可能存在微量固溶体金。

Abstract:

Many chemical and physical methods, such as microprobe analysis, transmission electrcn-micrcsccpic study, phase analysis, unit cell parameter determination, thermcelectric ccefficient determinaticn, specifie gravity and hardness determinaticns, size enalysis, and chemical analysis, have been applied to the study of the typomorphic characteristics of pyrites and the mode of occurrence of gold in pyrites in the gold deposits of the Zhaoyuan-Laizhou area. In the paper, preliminary discussion is made on the rel...