Study On Remote Sensing Alteration Information Extraction And Prospecting Target Area Prediction In Laobing Area Of Xinjiang

The LaoBing area of Xinjiang is located in the West Kunlun metallogenic belt.The geological structure is complex,the ore-forming geological conditions are superior and the mineral resources are very rich.But the natural condition is very bad,the transportation is extremely inconvenient,therefore the geological research and the mineral exploration work degree is relatively low.In this paper,the related geological,stratigraphic lithology,magmatic rock and other related data of the study area are classified and summarized,the stratigraphic lithology,the line ring structure geological interpretation,the remote sensing alteration anomaly information are extracted from the study area by remote sensing technology.Combined with multi-source information,comprehensive analysis is carried out,and the prospecting target area is forecasted.This paper is of great significance to guide the exploration of ore resources in LaoBing area of Xinjiang,which can point out the direction of the exploration of mineral resources and provide the basis for the development of the follow-up work.According to the spatial and spectral resolution of remote sensing data,the method of data preprocessing is studied.In this paper,Sentinel-2A data and Landsat-8 satellite data are selected as the main data sources.By comparing and analyzing the spectral characteristics of typical minerals and the corresponding spectral characteristics of remote sensing data,remote sensing alteration anomaly information is extracted from the study area.Based on GIS technology,the existing lithology,alteration anomaly information and line ring structure are superimposed and analyzed to delineate the prospecting target area.This paper mainly completes the following work and achievements:(1)Sentinel-2A data and Landsat-8 data are used as the data sources of remote sensing alteration information extraction,and the pretreatment of remote sensing data is studied.According to the principle of the best combination of color bands,the color band is synthesized,and the remote sensing data is preprocessed,such as radiation correction,data fusion,etc.Finally,the working background map is obtained which is conducive to the extraction of remote sensing prospecting information.(2)The relationship between altered rock and mineralization in the study area is analyzed,the extracted mineralization anomaly is determined,and the spectral characteristics of the main altered minerals are analyzed.The method of remote sensing alteration information extraction is designed based on Sentinel-2A data and Landsat-8 data,and the information is extracted successfully.The reliability of two kinds of data is evaluated with field verification and geological data.The mineralized alteration information extracted from the two kinds of data is well coupled with the actual known ore point and alteration,and the result of this extraction is effective.(3)The alteration information extracted from Landsat-8 data and Sentinel-2A data is compared and analyzed.The results show that Sentinel-2A data are more accurate than OLI data in extracting alteration anomalies in LaoBing area of Xinjiang,especially for iron stain alteration anomalies.(4)The geological,remote sensing,geophysical and geochemical anomaly data of the study area are analyzed synthetically.With the help of GIS spatial analysis technology,the extracted mineralized alteration anomaly information is superposed with the vectorized data,and the ore-prospecting target area is predicted by buffer analysis.