Geological Interpretation of Heliborne Geophysical Data from the Kaladgi Basin; Southern India

Abstract

Geological interpretation from the Kaladgi Basin is based on integration of heliborne time domain electromagnetic (HELITEM), magnetic and gamma-ray spectrometry data with available geological mapping, ground exploration data, various published papers and spectral remote sensing data such as Landsat 7ETM+ and ASTER GDEM imagery. Electromagnetic (EM) data, magnetic, radiometric, Landsat TM and Aster datasets were used for delineation of surface and subsurface extent of geological units and structural elements and for better understanding of the overall structural pattern of the Kaladgi Basin, including distribution of its local depocentres, the resistive basement surface and the magnetic basement topography. The interpretation of the available data details the localisation of intrusive bodies, basaltic lava flows, mafic dykes, basement faults and major intrabasinal fault systems. Three dimensional grids (voxel models) of EM data were used for visualization in three dimensions.