关键词: 铜锌多金属矿, 深部找矿, 维拉斯托矿区 , 隐伏矿体 , 大功率激电测量

Abstract: The Weilasituo magmatic hydrothermal Cu-Zn polymetallic deposit is located in the southern section of the Great Khingan metallogenic belt，more than 8 million tons of ores have been found，which has great potential for resources.The orebodies are mainly occurred in the Xilinguole complex rocks of the Lower Proterozoic and controlled by NE-trending faults.The surface is covered by Quaternary sediments，and accurate location of concealed orebodies in this overburden area is an urgent problem to be solved.Combining with the geological data，borehole data，physical property data and ground high-precision magnetic survey data，the work of induced polarization (IP) sweep，profile and IP sounding are carried out in the geophysical anomaly area with great prospecting potential，the measurement data is interpreted and analyzed in depth.The results show that:①The magnetic susceptibility and residual magnetization of gabbro are relatively large，the other lithologlies have no obvious magnetic changes in the study area，the surrounding rocks，intrusive rocks，tectonites (including alteration) and oxidized ores can not produce IP anomalies，the apparent polarizability is less than 4%，which apparent resistivity is greater than 1 000 Ω?m.Orebody is the main cause of IP anomalies，which apparent polarizability is higher than 4% and the apparent resistivity is about 1 000 Ω?m，which can be used as the basis of dividing IP anomalies in survey area.②The apparent polarizability and apparent resistivity contour maps show that two high value zones are distributed in North-South direction，which are distributed in nearly parallel and spread in a "S" shape on the plane，thus constituting the basic pattern of the study area，and the NE and NW orientation high value zones are distributed and interlaced into grids，the positions of nodes are the IP abnormal points，which can be inferred as the main location of orebody enrichment.Accordingly，anomalies in the survey area can be divided into the east belt and the west belt，and further divided into four anomalous zones along the North-South direction.③Through the interpretation and inversion of IP sounding profiles，the plane position of the anomalous bodies revealed by the interpretation of the inversion results is basically consistent with the ones obtained by actual measurement，but the inversion depth is slightly shallow.Boreholes are laid in the anomalous areas，the orebodies are exposed effectively，which has important guiding significance for the further boreholes layout in the study area.The above analysis further indicated that the integrated geophysical prospecting method and data interpretation method are feasible，which can be used in the similar areas.

Key words: Cu-Zn polymetallic deposit, Deep prospecting, Weilasituo mining area, Concealed orebody, High-power induced polarization