Method And Application Of Geochemical Element Combination Anomaly Extraction Based On Variogram

With the rapid development of China's economy,the demand for resources is increasing.Therefore the occurrence of mineral resources and the prediction of resource potential have become important issues in current economic development.As an important means of mineral resources exploration,geochemistry is of great significance for mineral resource prediction and potential evaluation.Therefore,it is vital to study the spatial distribution characteristics of geochemical exploration elements and explore the combination of geochemical exploration elements for guiding geochemical prospecting.Guided by the relative theories of geostatistics,this paper takes the Aoxia mining area in Ruichang,Jiangxi Province as the research area,and collects 1:10 000 rock geochemical data of Au,Ag,Cu,Pb,Zn,As,Sb,Bi,and etc to do some study about combined abnormality.Firstly,the raw data is preprocessed,and the data is descriptively statistically analyzed in order to show the basic characteristics of the data.Secondly,this paper conducts an in-depth analysis on the problem of geochemical element combination anomaly retrieval,and constructs a geochemical element combination anomaly extraction model based on the variogram.Eight elements are used to obtain the spatial distribution characteristics of the elements(variable range values),and combined with the cumulative frequency method for abnormal banding processing to realize the visual expression of combined anomalies.Finally,we put the constructed combination anomaly model in to practice and do a comparative analysis of geochemical element combination anomaly extraction models based on principal component analysis.Through the research and study in this paper,we can draw following conclusions:(1)Through the anomaly extracted by the analytic element combination anomaly extraction model based on the variogram function constructed in this paper,it can be found that about 80% of the anomalous regions have good reproducibility with the abnormal results extracted by traditional principal component analysis.At the same time the abnormal intensity has been enhanced,which is more consistent with the geological background of the study area.From this prospect,the spatial distribution characteristics of geochemical elements have been expressed in a better way.(2)The geochemical element combination anomaly extraction model constructed in this paper not only considers the correlation of elements,but also considers the spatial variability of elements.As a result,the extracted element combination anomaly features are more in line with objective geological laws.The model constructed in this paper is further enriched the technique of geochemical exploration element combination anomaly extraction.