剪切带断层泥特征及其在胶东金矿床研究中的应用

剪切带断层泥是中低温热液蚀变的产物。研究表明,断层泥的形成演化与剪切带水-力行为间存在强烈的作用与反馈。断层泥的粒度分布、矿物组成以及孔渗结构受断裂带构造变形和流体作用的控制。同时,由于具有组成和结构上的特性,断层泥可以通过增强岩石各向异性和储存或释放流体而改变断裂带剪切强度和流体压力。以胶东金矿集中区为例,讨论了剪切带构造变形、流体输运-反应与断层泥形成演化的耦合作用,及其对剪切带流变学行为及金矿化形成和分布的影响。

Characteristics of shear zone gouge and its application to gold metallogeny research in Jiaodong

Fault gouge of auriferous shear zone was formed by hydrothermal alteration.Previous research shows that there are dramatically coupling effects between the formation and evolution of fault gouge and the hydraulic-mechanical behaviors of shear zone.Studies indicate that the grain size distribution,mineralogy and porosity-permeability structure of fault gouge are controlled by structural deformation and fluid effect within the shear zone.Meanwhile,for its characteristics in composition and texture,fault gouge might change the shear strength and fluid pressure within shear zone by enhancing rock anisotropy and storing or releasing fluids.This paper,taking the shear zone-hosted gold ore deposits,Jiaodong region as an example,aims to investigate the coupling effect of shear zone structural deformation,fluid transportation-reaction and fault gouge formation and evolution,and then reveal the contribution of this coupling effect to the rheology of shear zone and the formation and distribution of gold mineralization.