Journal de géologie et géophysique
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Reassessment of Basin Evolution Premise of Bhima Basin in Light of High Resolution Aeromagnetic Data

M Sridhar*, V Ramesh Babu, J K Patnaik, Rakesh Mohan, R Mamallan, B Saravanan

The tectonic signatures for the extensional basin evolution are generally not well developed and it is relatively difficult to reconstruct, particularly when affected by a strong deformation associated with subsequent compressional tectonics. In the present study, an attempt has been made to map structural elements buried beneath younger cover in Bhima basin, by using aeromagnetic data. The magnetic data indicates that around Malla Buzurg, a NE-SW trending fault affects the Gogi Fault and swerves it towards southwest Kalakeri. Bhima basin has possibly evolved over a failed E-W trending rift zone, surmised as reactivation post sedimentation of Bagalkot Group. Later the NE- SW shear couple bounding the geometry to a lozenge shape with long axis along NE-SW, probably defined the basin boundaries and the NW-SE trending dextral strike slip faults have defined the present day basin configuration.