Palaeoproterozoic Talc and Clay Mapping Using Spaceborne Imaging Spectrometer Prisma Data Through Derived Spectral Indices

The domain of geosciences using the Remote Sensing method for identification and mapping of the minerals, alteration zones, litho-units, and structural patterns. PRISMA is a medium spatial and spectral resolutions spaceborne imaging spectrometer which was utilized for the mapping of the Mg-OH and Al-OH bearing rocks i.e., talc and clay, present in the Jahazpur belt. The dataset is initially preprocessed to remove the noisy, nodata, and atmospheric water vapour containing bands. Spectral signature curves of these minerals have been identified from the imagery with the help of the UGSG mineral library. Characteristics spectral features of these minerals have been identified and cross-checked for the various locations in the image. After ensuring their characteristic spectral features in the image spectra, spectral indices for talc and clay have been proposed. The derived mineral maps had been compared with the existing geological map of the region and showed higher resemblances for these two mapped minerals. This study shows the potentiality of the PRISMA dataset for mineral mapping and the effectiveness of the generated spectral signatures for the study of the different earth materials.