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蓬家夼金矿是山东乳山地区新发现的金矿类型 ,受荆山群中的构造角砾岩系控制 ,沿胶莱盆地边缘莱阳组砾岩与荆山群副变质岩的构造接触带分布。矿体严格受滑脱构造控制 ,与荆山群变质杂岩中的大理岩、含石墨岩系关系密切。矿床地球化学特征表明 ,矿质主要来自围岩荆山群地层。认为蓬家夼金矿是在白垩系火山活动期间 ,以大气降水为主的混合水循环系统 ,萃取围岩 (主要是荆山群 )中的成矿物质 ,沿滑脱断层沉淀形成的 ,而不是前人所确定的沉积 -改造作用形成的新类型金矿床。
The Pengjiawan gold deposit is a newly discovered gold deposit in the Rushan area of Shandong Province. It is controlled by the structural breccia series in the Jingshan Group and distributed along the tectonic contact zone between the Laiyang Formation conglomerate and the Jingshan Group metamorphic rock at the margin of the Jiaolai Basin. The ore body is strictly controlled by the slippage tectonics and closely related to the marble and the graphite-bearing rocks in the Jingshan Group metamorphic complex. The geochemical characteristics of the deposit show that the mineral is mainly from the surrounding rock Jingshan Group strata. It is concluded that the Pengjiajing gold deposit is a mixed water circulation system dominated by atmospheric precipitation during the Cretaceous volcanic activity and extracts ore-forming materials from the surrounding rocks (mainly Jingshan Group) and precipitates along the detachment faults rather than from previous generations Determined by the sedimentation - a new type of gold deposit formed by the remodeling effect.