Tudy On Ore-controlling Structure Characteristics And Orebody Distribution Regularity Of Hailangou Gold Deposit,Penglai City,Shandong Province

Jiaodong gold deposit has a leading position in China's gold resources,and is famous for "Linglongjiaojia type" gold deposit in the world.Penglai gold deposit is distributed in the northern part of Qixia-Penglai metallogenic belt,and Heilangou gold deposit is the largest gold deposit in Penglai area.Fault structure is the primary factor for gold deposit positioning,so it is of great significance to clarify the characteristics and rules of ore-controlling structure for deposit types and distribution rules of vein and orebody,and to promote the further development of ore exploration work.On the basis of consulting and summarizing the previous achievements,through the observation on the surface and underground of Heilangou gold mine,the strata,magmatic rock,ore-controlling structure and ore-body distribution law are analyzed and summarized,and the structural ore-controlling model is discussed.The following main understandings have been obtained:(1)The veins and alteration zone of Hailangou gold deposit are mainly caused by NNE,NE and NEE trending fault structures.The NNE trending structure was formed by right shear during the metallogenic period,and the NEE trending structure was formed by left shear during the metallogenic period.The NW trending structure was formed before and after the metallogenic period,and the pre-metallogenic fault structures were still active after the formation of the metallogenic fault structures.Therefore,NW-trending structure can destroy and transform the orebody.(2)There are quartz vein gold deposits and cataclastic altered rock type gold deposits developed in Heilangou gold deposit,in which quartz vein type gold deposits are the main type.The cataclastic altered rock type gold deposits occur in the first-order compression-torsional faults,and the quartz vein type gold deposits occur in the secondary tensile and tensile shear fault structures.The orebodies are small in size but high in grade.(3)Based on the analysis of the ore-controlling structure of the Heilangou gold deposit,the following five ore-controlling structures are obtained:(1)The regional distribution of Jiaodong gold deposit is controlled by Qixia complex anticline;(2)The distribution of ore deposits is controlled by the Zanggezhuang fault depression,in which the Heilangou gold deposit is located in the northern margin of the Zanggezhuang fault basin.(3)It has multistage fault structural system,which is manifested in the primary and secondary fault structures controlling ore,and it is easy to form thicker ore bodies at the intersection of multistage structures;(4)It has the characteristics of structural combination ore-controlling law(5)It has the characteristics of composite structure ore-controlling law,which makes the ore-vein development trend change.(4)The distribution of the orebody of the vein is consistent with that of the metallogenic structure,which is most obviously affected by the NNE trending structure,and the lateralization phenomenon is obvious,lateralization to the southwest direction,and gradually lateralization from the northeast direction to the southwest direction from the shallow to the deep.