山东招远七里山金矿床断裂构造特征及其控矿规律

Characteristics of fault in Qilishan gold deposit,Shandong province and its ore control pattern

七里山金矿床位于焦家金矿田的东部边缘,赋存于灵山—北截断裂的次级断裂——七里山断裂的末端部位,属于典型的蚀变岩型金矿床。文章通过对七里山金矿床控矿断裂构造的系统研究,认为其主控矿断裂是由多条延伸长度有限、呈雁列状产出的断裂组构成的断裂带,即雁列式断裂,并在雁列单体叠合部位发育一系列与主断裂斜交收敛的压性断层桥,这两者共同构成了矿区主断裂控矿构造的基本格架;雁列式断裂及压性断层桥共同控制了矿化局部富集,矿体呈似等距分布、侧伏,以及矿体规模大小相间变化等空间展布规律。认为矿区59勘探线以西、Ⅰ号矿脉上部侧伏线以下部位有可能找到一定规模的金矿体。

Qilishan gold deposit is located at the end of Qilishan fault which is a sub-scale fault of Lingshan-Beijie fault in the eastern margin of Jiaojia gold ore field.It is a typical altered rock type gold deposit.Systematic study on the ore-control structure of the Qilishan fault show that it is a fault zone consisting of serial major ore-control faults limited in extension and arranged in en echelon and there developed a series of piezotropy fault-bridges which converged to the main fault in the overlapping parts of en echelon monomer.The en echelon fault and piezotropy fault-bridge constitute the basic frame of ore-control structure.They jointly control local enrichment of the mineralization.The ore bodies pitch in similar direction,are distributed in equal distance and big ore body and small ore body occur alternately.On this basis the author consider that ore bodies in certain sizes may occur in the west of line 59 and bellow the pitching line at upper part of ore vein I.