Very Low Frequency Electromagnetic, Magnetic and Radiometric Surveys for Lamproite Investigation in Vattikod Area of Nalgonda District, Telangana State, India

Very Low Frequency Electromagnetic (VLF-EM), total magnetic and radiometric investigations were carried out in the newly discovered Gundrapally and Vattikod Lamproite fields, Nalgonda district, Telangana State, at the North western margin of the Meso-Proterozoic Cuddapah basin in the Eastern Dharwar Craton (EDC), South India. The effectiveness of these methods is in mapping variations of subsurface geological structures, faults/fractures disposition, extent of the dykes and contact between different rock types. The VLF-EM, magnetic and radiometric measurements were performed along seven profiles (I to VII). The results revealed the location of conductive bodies, geological boundaries, dykes, faults/fractures and shear zones are delineated along contact between dykes and granitic rocks. The Fraser filtered data plots as well as Karous-Hjelt filter 2-D inversion current density pseudo sections for real and imaginary components has aided in refining the location of conductor response, dip and the depth of these conductors. The interpreted results VLF-EM corroborated well with the magnetic and radiometric results.

Author(s): G. Sriramulu, G. Ramadass, Dubba Vijay Kumar

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