辽宁四道沟金矿黄铁矿的标型特征

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．

Study on the Typomorphic Characteristics of Pyrite in Sidaogou Gold Deposit, Liaoning

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.