摘要
本文以研究方铅矿铅同位素组成为基础,将金顶铅锌矿床壳源与幔源的铅区分开来,并讨论了矿床的形成经历,即同生沉积—沉积改造—后期幔源铅叠加成矿的复杂过程。
There are two different sources of lead in Jinding Pb-Zn deposit.One is mantle lead,which is represented by cource-grainedgalena,and has the low μ values and homogeneous Pb isotopic compositions which accord with those of oceanic ridge basalt lead.Ore -forming period of mantle lead is about 30～40Ma which approximates to the early stage of the Himalayan movement.Anoth-er is crust lead,which is lead of galena coexisting with colloid and spherulitic pyrites.It is characterized by high μ values and^(20(?))Pb/^(204)Pb rations larger than 15.6.The crust lead is probably formed by the way of the synsedimentation and/or the reforma-tion.The different source lead indicates that the deposit is formed by the sedimentary reformation and late superimposedmineralization of mantle lead.
出处
《地质与勘探》
CAS
CSCD
北大核心
1993年第5期21-28,共8页
Geology and Exploration
