个旧锡矿区方铅矿的某些成因矿物学特征及其找矿意义

个旧方铅矿颜色深,光泽暗者含银高,银以类质同象赋存者反射率高,硬度与晶胞参数呈正相关。方铅矿主元素含量及Pb/S比值反映矿区低铅亏硫的成矿环境。锡含量及红外光谱谱线可作为深部锡矿床的判别标志。方铅矿中银以独立矿物的形式赋存或(Bi/Ag)<0.001％的矿床,银可具工业价值。晶胞参数随成矿温度的降低而增大。稳定同位素表明成矿物质多源。

SOME GENETC MINERALOGICAL CHARACTERISTICS OF GALENA FROM THE GEJIU Sn MINING DISTRICT AND THEIR SIGNIFICANCE IN PROSPECTING

In the Gejiu Sn mining district galena, if it is dark in colour and luster, contains high silver. Galena with silver occurring isomorphously is high in relfectivity. There is a positive correlation between its hardness and unitcell parameters. The major element content and Pb/S ratio of galena may reflect an ore-forming environment characterized as being low in lead and depleted in sulfur. Sn content and infrared spectrum can be used as criteria to identify Sn deposits at depth. Occurrence of silver independent minerals in galena or Bi/Ag ratio<0.001% in ore deposits may indicate that the silver grade is so high as to be of commercial value. The unit-cell parameters tend to increase with decreasing ore-forming temperature, Stable isotope data provide strong evidence of multi-source of ore-forming materials.