胶东地区滑脱构造与金矿成矿浅析

Gold mineralization associated with detachment structure in Jiaodong region

滑脱构造对超大型金矿床的形成有重要的控制作用。根据对胶东地区蓬家夼、郭城和发云夼金矿的研究 ,结合国内外有关资料 ,分析了滑脱构造的地质特征及其所控制的层间滑动角砾岩型金矿的特征 ,提出了 3点新认识 :1 )滑脱构造在沉积盆地的不同地域控制着不同的成矿类型 ,构成了完整的层间滑动角砾岩型金矿成矿系列 ;2 )在伸展环境中形成的、伴有热液沉积矿层的滑脱构造在后期的构造演化过程中 ,常可复活、叠加后期成矿作用 ,并被构造推覆形成透镜化的构造富集矿体 ,从而形成大型或特大型金矿床 ;3)层间滑动角砾岩型金矿在盆地的长期演化过程中形成 ,经历了从伸展—挤压—走滑的构造环境。指出滑脱构造所控制的层间滑动角砾岩型金矿的初步鉴别标志。

Detachment structure has an important control on the formation of the superlarge gold deposit. This paper introduces the geological characteristics of the detachment structure and the geological and metallogenic characteristics of the interlayer slide breccia type gold deposit, according to the study of Pengjiakuang, Guocheng and Fayunkuang gold deposit. Three conclusions were deduced. 1) Different metallogenic types controlled by detachment in different parts of the sedimentary basin produced a whole interlayer slide breccia type gold metallogenic series. 2) Formation of the super large interlayer slide breccia type gold deposits were secular and multiple geological metallogenesis. 3) The interlayer slide breccia type gold deposit was resulted from a secular evolution of the basin, which had experienced extension, compression and slip. The primary identified criteria of interlayer slide breccia type gold deposit controlled by detachment structure were discussed.