招平断裂带中段金矿床控矿条件与成矿规律研究

Research on Ore-Control Conditions and Metallogenic Law of Gold Deposits in Central Zhaoping Fault,Eastern Shandong Province

招平断裂带中段为胶东地区重要的金成矿带,目前已查明的金矿床主要包括夏甸大型金矿床和大尹格庄特大型金矿床,姜家窑和曹家洼中型金矿床,以及焦格庄小型金矿床。研究人员对招平断裂带中段各类金矿床的构造控矿条件、分布规律和矿体赋存规律仍缺乏较系统的认识,亟待开展进一步研究。通过对金矿区地质特征、金矿床地质特征、构造控矿特征和金矿成矿规律进行分析和总结,得出大尹格庄特大型金矿主要受招平主干断裂控制;夏甸大型金矿床主要受控于主干控矿断裂下盘伴生、派生的低级和低序次断裂,夏甸北耩矿体主要受控于主断裂下盘岩体局部张性显微裂隙带;招平断裂带中段大尹格庄特大型金矿床、夏甸特大型金矿床和焦格庄中、小型金矿床大致呈等间距分布,近EW向断裂与招平断裂的交会部位是有利成矿部位;断裂的拐弯或交会部位为主要赋矿部位。

As one of the famous gold-enriched areas in China,a large number of super-large,large and mediumsized gold deposits have been discovered in Jiaodong Peninsula. Some research had been carried out on the formation mechanism,metallogenic epoch,material source,division of regional metallogenic belt and the temporal-spatial relationship between main geological bodies and gold mineralization in Jiaodong Peninsula.But there is still a lack of detailed understanding of the tectonic ore-controlling conditions,distribution regularities and occurrence regularities of gold deposits in this area.In this study,the regional geological characteristics,the geological characteristics of gold deposits and the ore-controlling characteristics of faulted structures and the metallogenic regularity of gold deposits are discussed,which will provide a reasonable explanation for the above-mentioned scientific problems,and hopefully provide a possible guidance for later prospecting. The middle section of Zhaoping Fault is an important gold metallogenic belt in Jiaodong Peninsula.The following typical gold deposits have attracted possible concerns:(1)Xiadian super large gold deposit and Dayingezhuang super large gold deposit;(2)Jiangjiayao,Caojiawa and Jiaogezhuang medium and small gold deposits. Nevertheless,the structural ore-controlling conditions,distribution regularity and ore body occurrence regularity of various gold deposits distributed in the middle part of the fault zone are still the main problems to be solved urgently. Based on the analysis and summary of the geological characteristics,gold deposit geological characteristicsBased on the analysis and summary of the geological characteristics,gold deposit geological characteristics,structural ore-controlling characteristics and gold metallogenic regularity of Xiadian large-scale gold deposit,Dayingezhuang super large scale gold deposit and Jiaogzhuang small-sized gold deposit,the following results and understandings are obtained.Dayingezhuang super large gold deposit is mainly controlled by Zhaoping main fault.Xiadian super large gold deposit is mainly controlled by main ore - controlling faults associated with lower wall,derived low-grade and low-order faults.Xiadian Beiqu orebody is controlled by local tensional micro-fracture zone of rock mass in lower wall of main fault. The Dayingezhuang,Xiadian and Jiaogezhuang gold deposits in the middle section of Zhaoping Fault zone are approximately isometric. The intersection of nearly EW-trending faults and Zhaoping Faults is favorable for mineralization. The bend or intersection of faults is the main ore-hosting part.