冀西石湖金矿田构造控矿分析及成矿远景  

Ore-controlling Analysis and Metallogenic Prospect of Shihu Gold Deposit Structure,Western Hebei

作　　者：马宝军[1] 高风刚[2] 牛树银[1] 张祥信[1] 孙爱群[1] 陈超[1] 

机构地区：[1]石家庄经济学院,河北石家庄050031 [2]中国黄金集团石湖矿业有限公司,河北石家庄050504

出　　处：《黄金科学技术》2012年第1期8-14,共7页Gold Science and Technology

基　　金：河北省自然基金项目"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：石湖金矿田位于太行山构造—岩浆多金属成矿带中段、阜平幔枝构造的核心位置。构造变形和岩浆活动决定了矿脉的分布特点及成矿模式。通过对矿区构造应力场及成矿作用要素的综合分析,得出如下认识:①NNE向的边界断裂活动使矿区受左行扭压变形,形成了NW、近SN向2组共轭剪节理系,其产状稳定,规模较大,叠加于阜平期形成的复式褶皱之上;②沿深断裂活动的侵入岩株形成局部应力场,邻近岩体形成拱张性应力场,在较远处(石湖和西石门)形成了近NW向的挤压应力场;③岩浆活动晚期成矿热液以岩体与围岩接触带为通道由深向浅、由SE向NW运移,矿区内石湖、西石门地区NW向节理处于张性环境,成为首要的容矿空间及富集成矿区,而SN向节理则处于挤压闭合状态,成矿不佳;土岭地区处于拱张性环境,不同产状的裂隙均遭受了热液矿化作用,但成矿规模有限。Shihu gold orefield is located in the middle section of Taihangshan structure-magmatic polymetallic metallogenic belt and the core location of Fuping mantle branch structure.Tectonic deformation and magmatic activity determine the distribution characteristics and metallogenic model of the vein.With the comprehensive analysis for the tectonic stress field and metallogenic elements of the deposit,the following understanding can be concluded： ①due to the early Neocathaysian movement of NNE direction,the deposit formed two sets of conjugate shearing joint systems of NW direction and nearly SN direction as the effects of torsion stress field,where in the occurrence is stable,the scale is relatively large,and the conjugate shearing joint systems are superimposed on the complex fold formed earlier; ②due to the intrusive rock （Mapeng pluton） of deep fault activities,the surrounding rock is further deformed, and the vicinity there of （such as Tuling） formed with an arch tensile stress field,and the ulterior point （such as Shihu and Xishimen） formed with a compression stress field of nearly north-west direction; ③ the metal- logenic hydrothermal solution in the magmatic activity period moved from deep to shallow and from SE to NW by taking the contact zone between the pluton and the surrounding rock as the channel;in Shihu and Xishimen areas of the deposit,the joints of NW direction are in a tension environment and are primary ore spaces and rich metallogenic regions,while the north-south is in an extrusion closed state,and the mineralization is poor;Tuling area is in an arch tensile environment,all the fractures of different occurrences are subjected to the effects of hydrothermal mineralization,and the metallogenic scale thereof is limited.

关 键 词：构造控矿 共轭节理 构造应力场 成矿模式 石湖金矿田 

分 类 号：P618.51[天文地球—矿床学]