冀西石湖金矿田古构造应力场数值模拟  

Numerical Simulation of Paleo-tectonic Stress Field of the Shihu Gold Orefield in Western Hebei Province

作　　者：马宝军[1] 陈超[1] 牛树银[1] 孙爱群[1] 张祥信[1] 

机构地区：[1]石家庄经济学院资源学院,河北石家庄050031

出　　处：《黄金科学技术》2014年第4期1-6,共6页Gold Science and Technology

基　　金：河北省自然科学基金项目"河北吉木村铜(钼)多金属矿田成矿控矿构造分析及数值模拟"(编号:D2013403018);"数值模拟技术在矿脉分布定量预测中的应用--以石湖金矿为例"(编号:D2008000534);国家自然科学基金项目"阜平幔枝构造麻棚地区的成矿作用研究"(编号:40872137)联合资助

摘　　要：石湖金矿田为中温热液型脉状矿床,构造裂隙的发育程度及产状是决定其矿床特征的主要因素。在进行构造解析的基础上,应用弹—塑性增量法对控矿构造进行了应力场数值模拟。综合分析表明:中侏罗世矿区主应力为NNW向,受NNE向边界断裂限制形成压剪性应力场,矿区处于应力高值区,岩石破裂形成了NW和近SN向共轭剪节理系,它们叠加于早期的复式背斜上,成为主要的容矿空间;晚侏罗世沿深断裂侵入的麻棚岩体使矿区围岩进一步变形,形成了不同位置的拉张区及挤压区,构造变形以对老构造的追踪和改造为主,新生裂隙较少;岩浆活动晚期成矿热液从深部沿深断裂由SE向NW运移,矿区内NW向节理走向与流体运移方向一致,且处于张性环境,成为首要的容矿空间及富集成矿区。Shihu gold mine belongs to hydrothermal mesothermal type vein deposits.The deposits’ characteristics are primarily determined by the degree of development of ore-controlling fractures and their occurrence. Conducting numerical simulation on the mine field’s tectonic stress field while applying the elastic-plasticity increment method,and in combination with tectonic analysis shows that：Subject to the effect of the torsional pressure stress field,the middle Jurassic mining area formed NW trending and similar SN trending conjugate shear joint system,they are superimposed on the early complex fold,and become the potential ore holding space. The late Jurassic epoch Mapeng intrusion intrudes along the deep fault,and to trace and transform the old tectonic and the new fracture is less.In later magmatic period,the metallogenic hydrothermal takes the deep fault as the channel to move from deep to shallow and from SE to NW,the NW trending joint trend is in conformance with the fluid moving direction,it is in an extensional environment becoming the primary ore holding space and the concentrated metallogenic area.

关 键 词：构造应力场 弹-塑性增量法 数值模拟 成矿预测 石湖金矿田 

分 类 号：P618.51[天文地球—矿床学]