胶东三山岛金矿构造控矿规律研究  

Structural Controls of the Sanshandao Gold Deposit in the Northwestern Jiaodong District,China

作　　者：杨奎锋[1,2] 朱继托[3] 程胜红[4] 刘玄[1,5] 江鹏[2,5] 范宏瑞[2,5] 

机构地区：[1]山东省金属矿产成矿地质过程与综合利用重点实验室,山东济南250013 [2]中国科学院大学地球科学学院,北京100049 [3]山东省地质调查院,山东济南250013 [4]中国黄金集团公司,北京100011 [5]中国科学院地质与地球物理研究所,北京100029

出　　处：《大地构造与成矿学》2017年第2期272-282,共11页Geotectonica et Metallogenia

基　　金：国土资源部金矿成矿过程与资源利用重点实验室开放课题(2013002);国家自然科学基金(41173056);中国地质调查局地质调查项目(1212011120762);山东省技术创新重点项目(201110606004)联合资助

摘　　要：胶东西北部是我国重要的金矿聚集区,矿床类型以石英脉型和破碎带蚀变岩型为主。发育在三山岛–仓上断裂内部的三山岛金矿床是胶东西北部蚀变岩型金矿的典型代表。最新的勘探结果显示,三山岛金矿在大于2 km的垂深处仍有很好的金矿化,而且三山岛金矿的一个显著特点是主矿体均发育在断裂内部的断层泥之下,断裂的形成和演化对金矿床的形成及矿体的空间分布具有重要的控制作用。作者通过不同尺度的构造分析后发现,在三山岛金矿床形成过程中,区域构造应力场的状态发生过明显的转变,由成矿前的右行张扭,转变为成矿初期的NNW-SSE向挤压左行剪切应力场,三山岛主断裂也在成矿期发生左行挤压逆冲活动,主断裂封闭,主断裂内的断层泥逐渐形成,封堵成矿热液于断层泥之下,形成三山岛矿区大规模的破碎带蚀变岩型矿化。The northwestern Jiaodong is one of the most important gold-producing areas in China. Gold deposits in this area were divided into two types, i.e. the altered tectonite type and quartz vein type. The Sanshandao deposit is a typical altered tectonite type gold deposit hosted within the Sanshandao-Cangshang fault zone. Recent exploration shows that there is still intense gold mineralization deep to 2 km below sea level in the Sanshandao gold deposit. Moreover, the main ore bodies occur only underneath the fault gouge inside the Sanshandao-Cangshang fault zone. The formation and evolution of the fault zone played an important role in controlling the spatial distribution of the ore bodies. Based on different scales structural analysis, we believe that the states of the regional stress field underwent obvious change from the pre-ore nearly EW trending dextral-shear transtension into the syn-ore nearly NNW-SSE trending sinistral-shear compression during the formation of the Sanshandao gold deposit. The transition of regional stress field consequently resulted in the closure of the Sanshandao fracture, and prompted the formation of the gouge. Circulation of the hydrothermal fluids under the fault gouge resulted in the formation of the large-scale altered tectonite types gold deposit.

关 键 词：胶东西北部 三山岛金矿 构造控矿规律 区域应力场 

分 类 号：P542[天文地球—构造地质学] P613[天文地球—地质学]