Study Of Deep Deposit Exploration Of Chigou Copper-molybdenum Ore District Based On Gravity,Magnetic And Electric Data

Chi Gou mining area is located about 25km to the west of Shanyang County,Shaanxi Province,with an area of 14km~2,belonging to the Zhashan lead zinc polymetallic mine.The geological background and metallogenic conditions of the area are abundant.Since 1990s,many units have been working in the Chigou area,but only some mineralization points have been found,no large-scale industrial deposits have been found,and the search for large-scale copper mines has not been broken through.The previous researches mainly focus on the analysis of metallogenic structure and dynamic background,and few researches on geophysical prospecting.Based on the previous research results,based on the gravity,magnetic and electrical data,geochemical prospecting,metallogenic geology and drilling,the paper combines the constraint inversion to interpret the distribution range,spatial occurrence characteristics,fault structure and favorable prospecting area of the hidden magmatic rock in the interpretation area.The geological geophysical model of the research area is established to provide data support for the analysis and prediction of deep prospecting in the research area,and then summarizes an effective comprehensive geophysical prospecting method system and thinking flow,which provides relevant basis and guidance for the breakthrough of exploration in the Chi Gou mining area.Based on the newly completed gravity,magnetic and electrical data in the research area,the paper systematically analyzes the characteristics of gravity,magnetic and electrical anomalies in the research area by means of various data processing methods and the data of gravity,magnetism and electricity,combined with the data of geology,drilling and previous research results,infers the fault structure system in the research area,the spatial distribution form of concealed rock mass,and predicts the favorable area for prospecting.Through this study,the main achievements and conclusions are as follows:(1)The physical properties and gravity magnetoelectric anomalies of the study area are analyzed comprehensively.Through the study of the identification technology of the vertical first derivative and the horizontal total gradient of the gravity magnetic data,the fault structure of controlling the rock and ore,the main intrusion channel of magma are found,the distribution range of the concealed rock mass closely related to mineralization is delineated,and the No.I concealed rock body is determined as the main concealed rock mass in the study area.The abnormal distribution of"low resistance and high polarization"in contact zone of rock mass is defined by ladder sweep,IP sounding and AMT sounding in the process of excitation.Based on the existing geological and drilling data in the research area,the geophysical field characteristics of the concealed rock,rock contact zone and mineralized body are clarified.The main metallogenic parts of the contact zone between rock mass and stratum are pointed out,and the favorable prospecting area is predicted.The breakthrough of prospecting is obtained through drilling.The research results have important guiding significance for further prospecting and prediction in this area.(2)Based on the comprehensive study of the data of gravity,magnetism and electricity,the exploration methods and exploration ideas of the Chi Gou porphyry copper minerals are put forward.Firstly,the hidden rock mass is delineated by high precision gravity and magnetic measurement with large scale,and the contact zone between rock mass and surrounding rock and the fault structure of rock control are divided;secondly,the abnormal distribution area of"low resistance and high polarization"in the plane of contact zone is detected by ladder sweeping surface in the excitation;finally,the distribution range of abnormal deep strike is determined by IP sounding and AMT sounding,and the key areas are verified by drilling.The technological process has practical reference value for deep prospecting in other similar mining areas.