摘要
老柞山金矿的磁黄铁矿由两期成矿作用生成。早期为六方磁黄铁矿 ,具有 2AC型超结构 ,产出量大 ,含矿性好 ,是重要的矿石矿物。其生成温度大致在 35 0～ 380℃之间 ,是由高温热液的突然冷凝形成 ;晚期磁黄铁矿为六方和单斜两变种的混合相 ,产出少 ,含矿性相对较差。生成温度在 30 0℃以下 ,其中的单斜磁黄铁矿既可以由高温的磁黄铁矿固溶体逐渐冷却溶离生成 ,也可由后期的热液作用于早期的六方磁黄铁矿发生蚀变而成。
The pyrrhotites in Laozuoshan gold deposit were formed after two epoches of mineralization. All pyrrhotites formed in early mineralization are hexagonal pyrrhotite(hpo). Their crestal super-structure are 2AC type.For bearing lots of gold minerals,this hpo is one of the most important minerals in ore-bodies.They were formed at temperatures about 350～380℃,result from quick cooling of high temperature hydrothermal liquid. The values maybe stand for the temperature of early mineralization; pyrrhotites formed in late stage are a mixture of monoclinic pyrrhotite(mpo) and hpo. Their content in ore-bodies is very low and bear few gold minerals. Existing of mpo shows that the temperature of late mineralization is below 300℃. Formation of mpo can be caused by exsolution from hpo as well as alterative action on former hpo. In short,the study suggusts that the characteristics of ealy hpo are favourable for mineralization and collection of Au.
出处
《世界地质》
CAS
CSCD
2001年第2期133-137,141,共6页
World Geology
