Geological Characteristics And Prediction Of Mineralization In The Depth And Peripheral Of Laoniugou Gold Deposit,Huadian City,Jilin Province

Laoniugou gold deposit is located in the eastern section of northern margin of the north china platform,the junction zone between the northern margin of the eastern end of the Tianshan Yinshan East-West structural belt and the eastern margin of the southern part of the new Cathaysian second uplift belt,zhangguangcailing,southeast side of Huifahe fault structure,middle part of NW trending main fault structural belt in Jiapigou,where has good prospecting potential with the good ore-forming geological conditions and prospecting marks.Guided by the prospecting prediction theory and comprehensive information metallogenic prediction in the exploration area,relying on the project of "detailed investigation of laoniugou gold deposit in Huadian City,Jilin Province",this paper summarizes the geological characteristics of the deposit,analyzes the geological conditions of the ore deposit,extracts the geological,geophysical and geochemical indicators and information of prospecting,delineates the metallogenic prediction area and optimization the prospecting tatget area based on the geological background and the geological survey of known deposits,which provides a scientific basis for the follow-up prospecting work deployment in the exploration area.The ore body of laoniugou deposit occurring in the northwest ductile brittle structural zone of Jiapigou occurs in the interlayer fracture zone of granite gneiss of laoniugou formation of Jiapigou rock group in the new Archean with the occurrence of vein and lenses.The main metal minerals in the ore are pyrite,followed by chalcopyrite,with micro amount of bornite,bismuth,galena and sphalerite.The wall rock alteration types are mainly silicification and sericite,among which silicification,sericitization and potassicization are closely related to mineralization.The deposit is formed as a meso low temperature hydrothermal gold deposit.The main ore controlling factors are granitic gneiss of laoniugou formation,NW zone of Jiapigou(NW trending fault structure)and Yanshanian diorite.The gold ore body occurs in the granite gneiss of laoniugou formation,and its morphology and occurrence are controlled by NW trending fault structure.The NW trending ductile shear zone is the main ore guiding structure of the deposit,and the secondary structure of its hanging wall is the main ore storage structure,which has obvious ore controlling effect.This paper summarized the ore prospecting signs of the mining area.The geological signs are mainly silicification,sericite and potassium alteration;the geochemical signs are mainly the anomaly of Au and the indicator elements Bi,W,Pb,Ag,Hg and Cu,the element combination Au Bi WPb,Zn Cd Ag,Sb Hg.The occurrence change position of NW trending metallogenic structural plane and its intersection with NE trending structural plane,and the change position of ore-forming geological body form attitude determined by aeromagnetic interpretation are important geophysical signs.The superimposed section of multiple marks is the most favorable prospecting area.According to the favorable degree of metallogenic geological conditions,the obvious degree of prospecting indicators,combined with the development of known ore bodies,three grade I prediction areas and one grade II prospective area are delineated in this area.