甘肃寨上金矿床南矿带断层泥的形成与成矿作用浅析

An Elementary Analysis on the Formation and Mineralization of Fault Gouge in Southern Orebelt of Zhaishang Gold Deposit,Gansu Province

寨上金矿床勘查过程中,在南矿带中发现了一定规模的断层泥,其本身也含矿,个别工程品位达到2.78×10-6。从这一典型的地质现象入手,结合地震学研究的进展,探索断层泥与成矿的内在联系。文章简述了断层泥的地质特征,指出断层泥是在浅构造层次条件下发生脆性变形的产物,经历了褶皱—断裂—断层泥的演化过程。分析了断层泥的发育与成矿的关系,认为断层泥的形成贯穿于成矿的全过程,是构造作用—热液叠加成矿作用的重要组成部分,断层泥对于热液成矿有封闭隔挡和促进含矿热液与围岩充分交代沉淀的作用。

A certain scale of fault gouge, which is also ore with individual gold engineering grade of 2.78×10^-6, was found in Southern orebelt of Zhaishang gold deposit.Exploration of fault gouge and metallogenic relation was con-ducted based on this typical geological phenomena, combining with advances in seismology.The article summarized the geological characteristics of the fault gouge, come to the conclusion that the fault gouge is shallow tectonic lev-el under the conditions of brittle deformation products, going through the fold-fauh-fauh gouge evolution process. Based on the analysis of relationship between the fault gouge development with mineralization, we suggested that fault gouge formation throughout the whole process of mineralization,which was an important part of tectonic hy-drothermal superimposed mineralization, fault gouge for hydrothermal mineralization has closed barrier and in favor of ore-bearing hydrothermal fluids and wall rock metasomatism precipitation effect adequately.