Geophysical exploration for interlayer slip breccia gold deposits:example from Pengjiakuang gold deposit,Shandong Province,China
会议名称：《中国科学院地质与地球物理研究所2004学术年会》
会议日期：2004年
学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程]
基 金：The project was carried out with financial support provided by the innovative project of CAS(KZCX3-SW-137,KZCX1-Y-03 and KZCX1-07) the National Science and Technology project(2001BA609A- 07-08)
摘 要：Interlayer slipping breccia-type gold deposit-a new type of gold deposit,defined recently in the northern margin of the Jiaolai Basin,Shandong Province,China-occurs in interlayer slip faults distributed along the basin *** has the features of large orebody thickness(ranging from 14 m to 46 m,with an average thickness of 30 m),shallow embedding(0-50 m thickness of cover),low tenor of gold ore (ranging from 3 g/t to 5 g/t),easy mining and ore *** type of gold deposit has promising metallogenic forecasting and potential for economic exploitation. A ground gamma-ray survey in the Pengjiakuang gold-ore district indicates that the potassium/thorium ratio is closely related to the mineralization intensity,*** larger the potassium/thorium ratio,the higher the *** gold mineralized alteration zone was defined by a potassium/thorium ratio of 0.35.A seismic survey confirms the location of the top and bottom boundaries and images various features within the Pengjiakuang gold mineralization *** gold-bearing shovel slipped belt dips to the south at an angle of 50-55°at the surface and 15-20°at depth. The seismic profile is interpreted in terms of a structural band on the seismic section characterized by a three-layered *** upper layer is represented by weakly discontinuous reflections that represent the overlying conglomerates.A zone of stronger reflections representing the interlayer slip fault(gold-bearing mineralized zone) is imaged within the middle of the section,while the strongest reflections are in the lower part of the section and represent metamorphic rocks at *** the same time,the seismic reflection survey confirms the existence of a granite body at depth,indicating that ore-forming fluids may be related to the granite.A CSAMT survey showed that the gold-bearing mineralized zone is a conductive layer and contains a low-resistivity anomaly ranging from 2Ωm to 200Ωm.