Numerical Simulation And Prospecting Prediction Of Tectonic Stress Field In The Mineralization Period Of Gaosong Ore Field In Gejiu Mining Area

The geotectonic location of the Gaosong ore field in Gejiu mining area is located in the southwestern corner of the Panjiang sag in the Youjiang Basin in the western part of the Cathaysia Block.It is the westernmost tip of the South China Metallogenic Province,adjacent to the Sanjiang metallogenic belt,and is a Tethyan structural domain and It is the product of the compound action of the Pacific Rim Tectonic Domain.The deposits in the area are obviously controlled by the compound action of structure and magmatic rocks.This thesis systematically divides the joint structure and fracture structure in the mine field,combined with the existing exploration results of the Gaosong mine field in Gejiu mining area,analyzes the evolution characteristics of the tectonic stress field in the mine field,divides the mine field structure system,and establishes the time of structural deformation.Sequence,using ANSYS finite element numerical simulation software to simulate the tectonic stress field before,during and after the metallization,and combine the numerical simulation results with the favorable ore-controlling conditions in the mining area,and carry out the favorable prospecting area in the area.prediction.The following main results have been achieved through research:(1)The fault structure in the study area is developed and most of the faults have the characteristics of multi-phase activities.The faults in the study area are divided into four groups of north-south direction,northeast direction,northwest direction and east-west direction according to different structural characteristics.The dominant directions of joints developed in the study area are concentrated in NE direction(30°?70°),NW direction(290°?330°),EW direction(80°?100°)and SN direction(340°?20°).between.Combined with the division of the main joint structures and fault structures measured,it is believed that the main stress direction of the Gaosong ore field has undergone four conversion processes since the Mesozoic.According to the evolution process,it is divided into the near SN direction(2°?16°)?NW-SE direction(310°?325°)?NE-SW direction(43°?53°)?near EW direction(72°?96°).(2)Sorting out the regional geological background,regional mineralization process and conditions of the Gejiu Gaosong ore field,summarizing the ore-forming dynamics process of the Gejiu Gaosong ore field,establishing the geological model of the study area,and using the finite element analysis software ANSYS to compile the Gaosong mine of the Gejiu mining area In Tian's ore-forming dynamics numerical simulation process,cloud diagrams of the maximum principal stress,shear stress and strain intensity in each period were obtained,and the characteristics of tectonic activities in each period were analyzed in combination with the numerical simulation results of the tectonic stress field.(3)Analyze the control effect of the tectonic stress field on the ore body by analyzing the relationship between the numerical simulation results of the mineralization period and the proven ore body,and extract the favorable metallogenic conditions of the Gaosong ore field in the Gejiu mining area.It is believed that the areas where the shear stress is concentrated and the strain energy decays rapidly are favorable prospecting sites,and the concealed ore bodies in the Gaosong ore field are predicted to delineate three areas with prospecting potential.