研究区位于郯庐大断裂东侧,属胶东半岛招平—莱州金成矿带,区内出露地层主要为胶东岩群,是区域主要的金矿源层.区内花岗闪长岩体发育,其金含量是标准花岗闪长岩体的7 倍,岩体形成时,含大量金质的期后热液是胶东金矿床形成的主要物质来源,成矿地质条件较好.根据矿石的结构构造、矿物共生组合及其相互穿插关系判断,研究成矿作用可分为石英-粗粒黄铁矿阶段、金-石英-细粒黄铁矿阶段、绢云母-方解石阶段,前两个阶段为金主要富集阶段.强沟金矿床围岩蚀变较弱,矿石类型以石英脉型和蚀变岩型为主,矿床为岩浆期后中温热液充填交代型.花岗闪长岩体与胶东岩群接触带、NNE向断裂带中金石英脉是研究区内重要的找矿标志.
The research area is located on the east side of Tanlu fault,belonging to the Zhaoping-Laizhou gold met-allogenic belt of Jiaodong peninsula.The Jiaodong rock group is the main source layer of gold deposits in the are-a.The granodiorite body is developed in this area,and its Au content is 7 times that of the standard granodiorite body.When the rock body was formed,the posttemporal hydrothermal fluid containing a lot of gold was the main material source for the formation of Jiaodong gold deposit,and the metallogenic geological conditions are good.Based on the structure of the ore,mineral symbiotic associations,and their interspersed relationships,the study of mineralization can be divided into the quartz-coarse grained pyrite stage,the gold-quartz-fine grained pyrite stage,and the sericite-calcite stage.The first two stages are the main stages of gold enrichment.The surrounding rock of the Qianggou gold deposit has weak alteration,and the ore types are mainly quartz vein type and altered rock type.The deposit is a post magmatic hydrothermal filled metasomatic type.The contact zone between the granite diorite and the Jiaodong rock group,as well as the gold and quartz veins in the NNE trending fault zone,are impor-tant prospecting indicators in the study area.