Study On Searching For Concealed Uranium Deposits By Geoelectrochemical Survey In Lejia Area,Xiangshan,Jiangxi Province

Xiangshan volcanic type uranium ore field belongs to South China hydrothermal type uranium deposit and is an extremely important uranium resource base in China.In the geological history of this area,the tectonic activity is strong and the magmatic activity is frequent,which also provides favorable conditions for the source and mineralization of uranium deposits.The study area is located in Lejia area of Xiangshan uranium Orefield,Jiangxi Province,because the results of searching for uranium deposits in its shallow layer are not ideal for a long time,so in order to solve the problem of searching for deep concealed uranium deposits in Lejia area,geoelectric extraction and survey has been carried out in this area and the following results have been obtained:1.The feasibility test of prospecting is carried out on the 64-line known section of Julongan-Lijialing deposit in Huxi mining area of Xiangshan Orefield.the test results show that the broken-line anomalies of U element and its related elements extracted by geoelectrochemistry can well correspond to the known uranium orebody.it has a good prospecting effect,and the broken-line anomalies of soil ionic conductivity and thermal mercury release measurement also play a certain role in the search for concealed uranium deposits.2.The coefficient of variation of geoelectric extraction elements is obtained by statistics,and the coefficient of variation shows that U,Th,Cu,Pb,Zn,Co and As have strong activity,differentiation and dispersion,while the activity,differentiation and dispersion of Mo and Ni are moderate,indicating that the above elements in the study area have good potential for enrichment and mineralization.3.Calculate the inner,middle and outer zone values of each element,draw the plane anomaly map of single element and soil ionic conductivity and thermal mercury release,and determine the best prospecting element assemblage of concealed uranium deposits by R-type cluster analysis and factor analysis,that is,F1 element assemblage(U,Th,Mo,Cu,Co,Ni,Ti,V),)and draw the plane anomaly map of F1 element assemblage.U,Th and Mo in F1 element assemblage reflect the medium-low temperature metallogenic information;Cu reflects the high-temperature metallogenic information,which is related to the later stage of sulphide mineralization;Co,Ni,Ti and V represent the slow-source high-temperature metallogenic information,indicating that the uranium ore-forming fluid may come from the slow source.4.According to the distribution characteristics of single element anomalies,the plane anomaly map of F1 element assemblage and the main geological metallogenic background conditions in the study area,one target area for type ? uranium prospecting,one for type ? uranium prospecting and one for type ? uranium prospecting are delineated,and a preliminary metallogenic potential analysis is made for each prediction target.and a preliminary metallogenic potential analysis is made for each prediction target area.In addition,both type ? uranium prospecting prediction targets and type ? uranium prospecting prediction targets tend to extend outside the study area.5.After a comprehensive analysis of the metallogenic geological background of the Xiangshan uranium Orefield and the metallogenic characteristics of the uranium deposits in the western uranium enrichment area adjacent to the study area,it is considered that the possible uranium orebodies in the study area mainly exist in porphyry lava and rhyolitic dacite and are obviously controlled by faults,especially secondary faults and large-scale fracture groups,and an ideal prospecting model is established.