层间滑动角砾岩型金矿床的地质特征及形成机制──以山东乳山蓬家夼金矿为例

Geological characteristics and genesis of interstratified glide breccia type gold deposit as exemplified by Pengjiakuang gold deposit

层间滑动角砾岩型金矿是山东乳山地区新发现的金矿类型，受荆山群中的层间滑动角砾岩系控制，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。矿体严格受层间滑动构造控制，在横、纵剖面上均呈连续的透镜状，每５０～１５０ｍ出现一次膨缩；矿体厚大部位产于层间滑动断层产状由陡（４５～５０°）变缓（１５～２０°）处，层间滑脱断层对蓬家夼金矿化的物质来源、成矿的构造条件和物理化学条件等都具有重要的控制作用。

Interstratified glide breccia type gold deposit is a new type discovered from Jiaodong,occurring in interstratified glide breccia of the Jinshan Group parametamorphic rock series in Mesozoic Jiaolai Basn.It located in the contact between the conglomerates of Laiyang Formation and the metamorphic complex of Late Proterozoic Jinshan Group.We have studied the principle geological characteristics and spatial variation of the orebearing structures,mineralization and occurrence and locating mechanics of ore bodies,and have proven that interlayer denudational faults control the metallization,including the controlling the oreforming metal elements sources,structrual conditions of mineralization.It was formed during the evolution of Jiaolai Basin.