• Maruthi N.E
• Basavarajappa H.T

Granitic rocks which, are exposed in the Precambrian Shields (PCS) throughout the world have evoked considerable debate, discussion, and controversy among a host of eminent petrologists and geochemists. the Closepet granites which are exposed in the southern portion of the Archeaen Complex (AC) of Karnataka are not an exception to this. The granites and the associated rocks of the Koratagere - Madhugiri area, which forms the central portion of the Closepet granite belt, have so far not been studied by any investigators on modern lines which can result in giving a unified picture of the geology of the area. Ruby and Sapphire formation occurs deep in the lithosphere in a regime of extremely high pressures and temperatures. Corundum is a rock form mineral its gem varieties, Ruby and Sapphire. Corundum is a very hard, tough, and stable mineral. Precambrian basement rocks of Karnataka composed of active and dynamic geological settings with economic mineral deposits and variety of gemstones. These gemstones were noticed all along the lithological contacts of Green stone and Schist Belts, adjesent to younger granites and granitoids of Dharwar Craton of Southern Karnataka. Madhugiri area comes to part of Tumakur district, having major four kinds of litho units with economically viable minerals including gemstones varieties particularly in contact zones of pink granite and amphibolite schist. Basement gneiss and acid volcanic rocks also impact the study area. Random samples were collected such as gneiss and corundum through GTC (Ground Truth Check). The study carried out by geological, petrochemical and Hyperspectral signature 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, optical properties and Petrographic study 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 of the study area. Spectral Radiometer bring out diagnostic features on lithological contact for better discrimination of verity gemstones and other minerals. The final results highlight the spectral characters of corundum and associated rocks for better mapping of Madhugiri area of Tumakur district and similar terrains of Karnataka State.

Hyperspectral Signatures, Geochemistry, Corundum, Madhugiri.

"Hyperspectral And Petro - Chemical Signatures Study On Corundum Bearing Litho-Units Of Precambrian Basement Rocks Around Closepect Granite Madhugiri Area, Karnataka, India.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 12, page no.619-628, December-2018, Available :http://www.jetir.org/papers/JETIR1812893.pdf

"Hyperspectral And Petro - Chemical Signatures Study On Corundum Bearing Litho-Units Of Precambrian Basement Rocks Around Closepect Granite Madhugiri Area, Karnataka, India.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 12, page no. pp619-628, December-2018, Available at : http://www.jetir.org/papers/JETIR1812893.pdf