HYPERSPECTRAL SIGNATURES ON CORUNDUM BEARING LITHO-UNITS OF PRECAMBRIAN BASEMENT ROCKS AROUND CLOSEPET GRANITE PAVAGADA AREA, KARNATAKA

Minerals are important natural, finite and non-renewable resources essential for mankind. Minerals are the treasures of the state, therefore systematic, scientific and sustainable harnessing of minerals wealth should be the cornerstone of development objectives of the state. The utilization of these minerals has to be guided by long term goals and perspectives. All these goals and perspectives are dynamic and responsive to the economics in scenario, the Karnataka mineral policy has to evolve. The study area Pavagada comes to Tumkur District. The district exposes mainly rock types belonging to the Peninsular Gneissic Complex (PGC), schistose rocks of Chitradurga and Dharwar super group, younger intrusives (Closepet Granite and basic dykes) and thin patches of quaternary gravels. The PGC occupy two-thirds of the area and is represented by migmatite, gneiss and other granitoids. The high grade schistsequelent toSargur group occur as continuous bands, small enclaves within the PGC and comprise amphibolites, ultramafics and banded ferruginous cherts with pelite zones. The study carried out by using advent high-tech tools of Spectro-Radiometer instrument, ViewSpec Pro and GIS software's. Four types of random samples were collected such as gneiss, granitoids, and corundum bearing amphibolites politic schist along with quartzite ridge through GTC (Ground Truth Check). The spectral signatures of the collected samples were derived in a closed laboratory environment to achieve better accuracythe study carried out by petrochemical study and spectral signature study using advent high-tech tools of Spectro- Radiometer (Spectral Evolution SR3500) 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 physicochemical 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 Pavagada area of Tumkur district in Precambrian basement rocks of Karnataka State.