| This paper takes the Xiagalaiaoyi River skarn Pb-Zn deposit in Huzhong District of the Great Khingan Mountainsas the object of study.According to the basic geology and geological data of the Xiagalaiaoyi River polymetallic metallogenic mining area,the regional geological background and metallogenic geological conditions are analyzed.Ore-forming factors such as ore-body location,geological conditions and geophysical anomaly characteristics are summarized,and a "Trinity" ore-prospecting prediction model is established.On this basis,the three-dimensional geological model of the study area are established by Micromine software,and the multi-source geological data of the study area is statistically analyzed by using the cube prediction model and the ore searching information method.The ore prospecting target area is defined according to the calculation results and prospecting indicators,and the metallogenic prediction and evaluation of the Xiagalaiaoyi River polymetallic mining area is realized.The main achievements and progress are as follows:(1)The geological characteristics of the deposit reveal that the Xiagalaiaoyi River lead-zinc deposit mainly occurs in the skarn of the marble in the contact zone between the medium acid epigenic intrusion and the Jianggou Formation and its vicinity,and the ore bodies are mainly veins,vein-likes,laminar,lentil,nest and so on.Surrounding rock types mainly include skarn,silication,chlorite,pyritization,epidotization,sericite,carbonation,limonization,etc.The mineralisation process can be divided into five stages: early skarn stageⅠ,magnetite formation stage Ⅱ(late skarn stage),early sulfide stage Ⅲ,sulfide stage Ⅳlead-zinc ore stage and supergenic oxidation stage Ⅴ.(2)Through the analysis of regional geological and geophysical characteristics,it is concluded that the favorable area of mineralization corresponds to low resistivity and high polarization in 3D IP anomaly results.The magnetic field anomaly is located at the intersection of the high-magnetic interpretation line ring structure,which corresponds to the intersection area of the positive and negative anomalies of the NE and NW faults.The surrounding rock of ore body has strong skarn,and the marble shows high magnetic susceptibility anomaly during mineralization.Secondly,the marble and granite intrusive rocks show high resistivity,and the low resistivity in the metallogenic area.It is inferred that the intersection area of positive and negative magnetic anomalies and the low resistivity area within the high magnetic susceptibility anomaly are important favorable geophysical prospecting areas.(3)Establish a "Trinity" ore prospecting prediction model according to the geological data and geophysical anomaly characteristics of the study area,and then build a three-dimensional geological model with the help of three-dimensional geological Micromine software based on the geological data and the "Trinity" ore prospecting prediction model as a reference.The 3D borehole model and orebody model are established according to the borehole data,and the 3D rock mass model and structural model are established according to the exploration line profile to realize the 3D visualization of the study area.(4)The block model was established based on the three-dimensional solid model,and the "cube prediction model" and the information content method were used to conduct prospecting prediction on the deep side of the study area.Seven targets were delineated,three for lead-zinc ore and four for magnetite ore.According to statistical analysis,the spatial location of the high value information area is similar to that of the known ore body.This phenomenon shows that the prediction has a certain credibility and provides suggestions for the follow-up exploration and development of the deposit.At the same time,it provides technical support and thought reference for the exploration and development of other ore deposits in the Xiagalaiaoyi River polymetallic mining area. |
