Soil Geochemical Characteristics And Prospecting Predictions Of The Dibaonamugang Gold-Copper Deposits,Tibet

Dibaonamugang gold-copper deposit,located in the west part of Tibet Duolong copper-polymetallic mineralization field.It is still in the stage of the census.In this paper,based on the theory,method and standard requirement of exploration geochmistry,we have carried out the survey of 1:25000 soil geochemical and systematic sampling of the mining area.Then detected 10 kinds of elements in the samples: Ag,Mo,As,Pb,Cu,Zn,Bi,Sb,Au,W through the means of ES?ICP-OES?AFS?GFAAS and POL.By digital signal processing and calculation,the Clark value of Samples,Coefficient of variation,Skewness parameter has been calculated to analyze the enrichment,discrete and normal distribution trend of samples.And compiled the element geochemistry maps.Factor analysis and cluster analysis are used to study the characteristics of the combination of elements.Extracted three main factors:(1)F01:Cu,Pb,Zn,As,Sb,Ag,Au;(2)F02:Pb,Mo,Bi;(3)F03:W,Bi,Ag.And divided into five paragenetic Association of elements:(1)Cu,Zn,Sb;(2)Au,Mo,Pb;(3)W,Bi;(4)Ag;(5)As.After comparing with the traditional iterative and Box-plot method,combined with the geological metallogenic background and regional geochemical characteristics,confirmed the background value and the abnormal lower limit.According to the selected abnormal lower limit,the single element anomaly map is compiled.Based on analysis of abnormal features,circled 6 anomaly areas with Cu,Au.Among them,the first,the second and the sixth anomaly has great potential for prospecting.On the basis of analyzing the synthetic anomaly,comprehensive the Geological and Geochemical conditions,Screening out two promising ore forming regions II-1 and II-2: II-1 target area mainly to search for copper and hydrothermal altered rock type gold.There are two tectonic fracture zones in the target area,and the ore-forming geological condition is superior.It is suggested that arrange the geochemical profile of the rock to further reduce the target area.II-2 target area mainly to search for porphyry copper deposit,Physical and Geochemical anomalies in this region are highly consistent.Recommended to implement trenching engineering according to the implementation of drilling engineering mine,revealing deep mineralization.