Journal
JOURNAL OF THE INDIAN SOCIETY OF REMOTE SENSING
Volume 49, Issue 2, Pages 249-257Publisher
SPRINGER
DOI: 10.1007/s12524-020-01208-2
Keywords
Hyperspectral data; Mineral alteration; Calcite deposits; Remote sensing; Ambaji; India
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The study utilized AVIRIS-NG data to map mineral alterations in the Ambaji-Deri area of northwestern India, showing good correlation between minerals like calcite, muscovite and chlorite with ground geological records, except for the scattered distribution of epidote, possibly due to spectral similarities with chlorite. The study highlights the power of hyperspectral techniques in mapping mineral alterations for mineral deposits, enabling wider area scrutiny and narrowing down for field investigations.
We used Airborne Visible Infrared Imaging Spectrometer-Next Generation data for mapping possible mineral alterations, which aid in mineral exploration over larger areas. The data were subjected to various advanced processing techniques like Minimum Noise Fraction, Pixel Purity Index,N-Dimensional visualization and Spectral angle mapper classification. End-member spectra were matched with those of the minerals as available in the United States Geological Survey Spectral Library. In the present study, the Ambaji-Deri area of northwestern India was mapped for mineral alterations. The area has thick forest cover along with rugged topography, which warranted the use of hyperspectral remote sensing approach. The minerals such as calcite, muscovite and chlorite have been mapped, which are showing a good correlation with the ground geological records, barring epidote, whose distribution is scattered. We attribute the possible reason to be the spectral similarities between epidote and chlorite, which makes them difficult to differentiate only on the basis of the present hyperspectral study. The hyperspectral technique, as illustrated, provides powerful tool for mapping mineral alteration to mineral deposits. This enables scrutiny of a wider area of interest to being narrowed down for first-hand field investigations.
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