Hyperspectral Radiometry to Characterise Dunite Alteration and Magnesite Deposits of Salem,South India |
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| Authors: | Satish Kumar Jayabal Sanjeevi Shanmugam Govindan Sukkiri |
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| Institution: | (1) Department of Geology, Anna University, Chennai, 25, India |
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| Abstract: | This work reports the results of insitu surveys, hyperspectral-radiometry and geochemistry for dunite-alteration and magnesite
mapping in the Salem, southern India. Spectral parameters such as the strength of absorption in the 865 nm and 2,300 nm range
for Fe2+ and CO32- respectively, and the position of absorption trough were derived from the laboratory spectra for 13 samples. It is observed
that dunite alteration and conversion to magnesite produce measurable changes in the VIS-NIR-SWIR spectra due to a transition
from the silicate-dominated rocky composition to carbonate-dominated industrial mineral composition. Relationship between
the spectra and mineralogy suggests that we can identify the varieties of magnesite using hyperspectral radiometry. |
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