摘要
通过对四道沟金矿黄铁矿晶形、化学成分、晶胞参数和反射率的研究，查明了黄铁矿的标型特征；成矿期黄铁矿是富硫亏铁，S／Fe＝1．28，成矿后黄铁矿为亏硫亏铁或只亏铁，S／Fe＝1．19．黄铁矿中Co，Pb，Cu也是标型元素，Co，Pb随Au的增加而增加，Cu随黄铁矿中Au的增加而减少．本区黄铁矿中不含Sb和V元素．不同期次黄铁矿其晶胞参数a0均为0．5419nm，V均为0．1591nm3，高于标准黄铁矿．这是由Co，Ni和As分别取代Fe和S所引起的．反射率的测定表明，成矿期黄铁矿的反射率随波长增大而增高，而成矿期后黄铁矿在481～590nm波长范围内反射率随波长增加而增高，而在590～644nm波长范围，反射率随波长增加而降低．
Based on the study on the crystal form,chemical composition,unit cell parameter and reflectivity of the pyrites in Sidaogou gold deposit, it is shown that the pyrites at ore-forming stage are rich in S, but poor in Fe, S/Fe = 1. 28; the postore pyrites are either poor in S and Fe or poor in Fe only, S/Fe= 1. 19 ; Co, Pb, Cu in pyrite are also the typomorphic elements, the content of Co and Pb increases with that of Au, the content of Cu decreases with Au. There is no Sb or V in the pyrites. The unit cell parameters of pyrites at different stages are higher than those of standard pyrite: a=0. 541 9 nm, V=0. 159 1 nm, which results from the replacement of Fe and S by Co, Ni and As. The determination of reflectivity shows that the reflectivity of pyrites at ore- forming stage increases with the wavelength,the reflectivity of postore pyrites increases with wavelength in the wavelength range of 481~590 nm, but decreases with the increase of wavelength in the range of 590~644 nm.
基金
国家黄金管理局有偿资助
关键词
黄铁矿
标型特征
化学成分
反射率
金矿床
pyrite
typomorphic characteristics
chemical composition
reflectivity
Sidaogou gold deposit
