Multi-criteria identification and extraction of tungsten-related exploratory geochemical anomalies in southern Jiangxi Province based on capturing efficiency of mineral occurrence
The tungsten(W)resources in southern Jiangxi Province represent important strategic non-ferrous metals resources.The identification and extraction of tungsten mineralization-related geochemical anomalies play a crucial role in tungsten prospecting.This article identifies eight single elements(Ag,Cd,Pb,Bi,W,Cu,Sn and As)and element associations(Ag,Bi,Cd,Cu,F,Pb,Sn,W,Zn and As)that are closely related to tungsten mineralization in southern Jiangxi Province through cluster analysis and principal component analysis.The cumulative frequency method,concentration-area(C-A)model,and prediction-area(P-A)model were utilized to extract geochemical anomalies,and quantitatively evaluate the anomalous areas delineated by the above three methods through capturing efficiency and conducting comparative analysis.The research results indicate that the distribution of high anomalies for these eight single elements and element association corresponds to the four ore districts within the area,demonstrating a strong indicative effect.In both the cumulative frequency method and the C-A model,the capturing efficiency of principal component 2 is the highest(4.39 and 33.90),with 66.10% of mineral occurrences identified in 15.04% of the area and 3.39% identified in 0.10% of the area,respectively.The P-A model has the highest capturing efficiency of the W element in the anomalous area(3.17),identifying 76.03% of the mining occurrences in 23.97% of the area.Among the comparison of these three methods,the C-A model exhibits the highest capturing efficiency of mineral occurrence in anomalous areas(33.90).However,the number of delineated mineral occurrences was relatively small.Although the P-A model has a lower capturing efficiency of mineral occurrence in anomalous areas,it identifies the most mineral occurrences(76.03% ),demonstrating a higher coverage of captured mineral occurrence.Therefore,this article comprehensively considers the capturing efficiency of mineral occurrence and coverage of captured mineral occurrence,and selects principal component 2 and W element geochemical anomalies based on multi-criteria extraction to evaluate the regional mineralization potential,and finally produces the anomaly distribution map.
万方数据
维普
