PHYSICO-CHEMICAL CHARECTRISTICS AND HYPERSPECTRAL SIGNATURE STUDY USING GEOMATICS ON GEM VERITY OF CORUNDUM BEARING PRECAMBRIAN LITHO-UNITS OF MAVINAHALLI AREA, MYSURU DISTRICT, KARNATAKA, INDIA

Mavinahalli area of Mysuru District, within amphibolite facies South of the Dharwar craton unity of sargur supracrustal rocks contain ultrabasic enclaves. The study area consist of major 5 kinds of litho-units and with economicaly viable minerals including gemstones varities main rock types in contact zones of ultramafics, fuchsite quartzite with kayanite, Amphiolite and hornblende schist with crystaline limestone, Banded iron formation with high grade metapelites and grey migmatite granodiorite tonalitic banded gneiss. the study carried out by petrochemical study and spectral signature study using advent high-tech tools of Spectro- Radiometer (Spectral Evolution SR-3500) instrument, DARWin SP.V.1.3.0 and GIS software's. The spectral signatures of the collected samples were derived in laboratory environment to achieve better accuracy. Hyperspectral (350-2500nm) were developed as works mainly on physico-chemical and optical properties of the litho units which help in mapping of precious gemstones at lithological contacts and mineralized zones. the present study aims to charactrize the spectral behavior of Corundum and associated rocks. Spectral radiometer instrument bring out diagnostic features on lithological contact for better discrimination of gemstones and altered minerals. The final results Highlight the spectral characters of corundum and associated rocks for better mapping in similar terrains of Karnataka State.