Research On The Remote Sensing Recognition Method Of The Granitic Pluton In The Beishan Area Of East Tianshan Mountains

Research on the remote sensing lithologic identification of the granitoid has always been a key and difficult issue. Depending on the project “research, development and application demonstration of the investigative techniques of geology and mineral resource with high resolution remote sensing of the key metallogenic belt in the West”, the paper conducts research in the remote sensing recognition method of the two typical granitic plutons in the Beishan Area of East Tianshan Mountains with multispectral data and collaborative applications of World View-2 and ASTER. The paper carries out enhancement of the differences in spectral characteristics-based and textural features-based experimental study on the basis of in-depth analysis and actual measurement of the spectral characteristic curve of the rocks, and ultimately, form a complete set of combined methods of the identification of different granitoids lithologies. The paper does not only provide referential technical guidance for the further remote sensing geological investigative works of the mineral resources in the metallogenic belt of this region, but also provide references for the information identification and extraction works of the granitoids lithologies of other regions, which is of certain practical significance. The research results of the paper are as follows:(1) Pre-processing method research in the measurement of the spectral data of the granitoids in the research area: the processing methods including jump point removal, smooth processing, resampling approach have been used to lay a solid foundation for the analysis of spectral characteristic curves.The conclusion-the varying spectral features of different lithologies are to a certain extent related to the mineral components and content has been drawn based on the analysis and research of the certain minerals and rocks’ spectral characteristic curves and the influential factors of the spectrums of the granitoids in the research area, which has paved the way for the identification of the lithologies in the later stage: the differences in the general spectral curves of the entire rock lithology are not conspicuous. The moyite contains plenty of biotite, the Mg-OH is intensively absorbed at 2.35 um, resulting in the ASTER’s intensive absorption at Band 8. Due to muscovite’s high proportion in the monzonitic granite, the Al-OH is intensively absorbed at 2.2 um, leading to intensive absorption at Band 6. Plagiogranite’s reflectivity increases with the enhancement of wave length, resulting in dual-absorption at Band 6 and 8.(2) On the basis of above analysis, the paper put forwards the ASTER statistics-based spectrum informational enhancement method, World View-2 statistics-based texture informational enhancement method, and collaborative application of the two methods-based enhancement method;(3) Enhancement method based on the above, to the Kanguertage for lithologic interpretation in the study area, compared with the existing geological data, not only revised lithologic boundary, and refine the lithology, and interpret the fold structure, provide the basis for metallogenic analysis and geological structure.(4) The research results of the Kanguertage research area have been applied to Mingshui region and resulted in fine lithologic identification applicational effects, which indicates that, the technical method can be used in adjacent areas with harsh conditions, effectively eliminating the workload of fieldworks.