A subsurface criterion for predictive exploration of kimberlites from Bouguer gravity in the eastern Dharwar craton,India |
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| Authors: | B. Veeraiah G. Ramadass D. Himabindu |
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| Affiliation: | (1) National Geophysical Research Institute, (Council of Scientific and Industrial Research), Uppal Road, Hyderabad, 500 007, India;(2) Department of Geophysics, Osmania University, Hyderabad, 500 007, India |
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| Abstract: | The Archaean-Proterozoic Dharwar craton has many recorded occurrences of diamondiferous kimberlites. Reports of kimberlite emplacement in parts of the tectonically complex eastern Dharwar craton and a significant density contrast between kimberlites and the host peninsular gneisses motivated us to conduct gravity studies in the Narayanpet-Irladinne area of the eastern Dharwar craton. This region is contiguous with the Maddur-Narayanpet kimberlite that lies to its north, while the river Krishna lies to its south. From observed association of reported kimberlites in the Maddur-Narayanpet field with subsurface topography of the assumed three-layer earth section obtained by Bouguer gravity modelling, we developed a subsurface criterion for occurrence of kimberlites in the present study area. Using this criterion, five potential zones for kimberlite localization were identified in the Narayanpet-Irladinne region, eastern Dharwar craton. |
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| Keywords: | Bouguer gravity Subsurface topography Kimberlite emplacement Dharwar craton Karnataka |
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