Soil Geochemical Characteristics And Prospecting Prediction In Luobuling Mining Area,Zijinshan,Fujian

The Zijinshan ore concentration area is a typical porphyry superhydrothermal Cu,Au,Mo,Ag metallogenic system,mainly including the Zijinshan high-sulfur copper-gold deposit,the Luobuling porphyry copper-molybdenum deposit,and the Yueyang low Sulfur-type silver polymetallic deposits and other deposits.Among them,the Luobuling porphyry copper-molybdenum deposit is located in the activation zone of the continental margin in the geotectonic position.The main exposed strata in the area are the Early Sinian Louziba Group,Late Devonian Tianwadong Formation and Taozikeng Formation,Early Carboniferous Woodland Group,Early Cretaceous Shimaoshan Group and Quaternary.The area has strong magmatic activity,diverse and developed structures,and is widely distributed in the northwest.At the same time,the northwest and northeast fractures are also important rock-controlling and ore-controlling structures in the area.Mainly potassium feldsparization and biotization.This study mainly used a lot of time to collect and sort out the data of predecessors,and fully combined with the work of predecessors in and near the study area,systematically understand the mineralization geological background of the Luobuling area of Zijin Mountain,and develop soil geochemistry.The surveyed research work and the exploration work in the study area have analyzed and tested 9 elements including Cu,Pb,Mo,W,Sn,Ag,Cd,Ge,Au,and fully integrated the geological characteristics of the study area to calculate the 9 elements.The coefficient of variation and the Clark value of the concentration are respectively used fractal theory method,R-type cluster analysis,correlation analysis,factor analysis method and trend surface analysis method to explore the characteristics of the geochemical anomalous elements in the soil in the study area.The information was extracted and the following conclusions were obtained:1.Through the coefficient of variation,concentration Clarke value and fractal characteristics of 9 elements,it is found that the dispersion degree of Mo,Ag,and Cu is higher;the enrichment degree of Cu,Mo,Ag,and Au is higher;Mo,Au,Ag element has a large spatial difference and a high degree of clustering.The fractal theory method is used to determine the background value and anomaly lower limit of a total of 9 elements of Cu,Pb,Mo,W,Sn,Ag,Cd,Ge,and Au in the study area.2.Combine R-type cluster analysis,correlation analysis and factor analysis to study the element combination and distribution characteristics in the Luobuling area of Zijin Mountain,and divide three groups of element combinations,namely Cu-Mo-Cd-Au,Pb-Ag-Ge and W-Sn,according to the factor score anomaly map,it is found that the anomalies are basically distributed in the contact zone between the Caixi pluton and the Sifang pluton,and the contact zone between the Luobuling pluton and the Sifang pluton,and are affected by the northwest direction(F_2-13,F_2-14),North-East(F_1-4)fault control.3.Using the trend surface analysis method to analyze the element combination,it is found that the display of weak anomalies is more obvious,the anomalies are clearly displayed,and the anomalies are mainly distributed in the Caixi pluton,Sifang pluton and Luobuling pluton,and F_1-4.Both F_2-13and F_2-14faults pass through anomalies,which are obviously affected by fault control.4.According to the above research results,three target areas have been delineated in the study area,which are located in the northwest(I target area),central and south(II target area)and southeast(III target area)of the study area.According to the abnormal combination of elements.The geological characteristics of the comprehensive study area show that the?target area is located in the tectonic fracture zone and rock contact zone in the northwest or southeast of the mining area,with obvious abnormal features and can be used as a target for further exploration.