A research on extracting mineralization anomalies of weathering crust bauxite based on remote sensing fusion data:taking the Sammonolong area of Cambodia as an example
Aluminum has a wide range of industrial uses.Bauxite is an essential strategic resource in the background of globalization and plays a crucial role in the development of our national economy.Because the distribution of weathering crust bauxite is closely related to topography,lithology,and geological structure,remote sensing technology is being applied more and more widely in its exploration.How to synthesize the advantages of all kinds of remote sensing data to extract ore-con-trolling factors and alteration information has also become the focus of weathering crust type bauxite exploration work.Based on the analysis of geological characteristics and ore-controlling factors of weathered bauxite,this paper selected the Semonol-ong area of south-eastern Cambodia as the research area and selected the OHS hyperspectral data of"Zhuhai No.1"and Landsat-8 multispectral data for preprocessing and data fusion.The Principal Component Analysis method was used to ex-tract the abnormal information of bauxite mineralization in the study area,analyze the spectral characteristics of the abnormal information of bauxite and its prospecting indication significance,screen the abnormal information of bauxite mineralization,and carry out hierarchical display.Results show:① Using high spectral and multi-spectral remote sensing data fusion can ac-cording to the characteristics of ore-controlling factors and metallogenic material type and space characteristics related to ab-normal information extraction,fusion data not only make up for the selected band limited range of hyperspectral data but also retain the advantages of high spatial resolution and high spectral resolution;② The remote sensing anomaly information extrac-ted based on the fusion of hyperspectral and multispectral data is highly correlated with the spatial distribution characteristics of the basalt and its weathering,topography and geomorphology in the area;The abnormal distribution range of bauxite minerali-zation is mainly concentrated in the open-cut and adjacent areas of the bauxite mine.③ Comprehensive anomaly and the known ore(bed)coincidence degree is higher,and weathering crust type bauxite main ore-controlling factors such as litholo-gy,and topography of spatial correlation is strong.The results of this study is suitable for prospecting the screening of poten-tial target zone and the synthesis anomaly area,the early exploration of foreign same-type bauxite,and rapid optimization tar-gets with technical support.
principal component analysisbauxitealteration anomaliesdata fusionhyperspectral data
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