Vindhyan Basin of Central India situated just north of SONATA rift zone, forms one of the major geotectonic segment of the
Indian subcontinent which is associated with complex thermo-tectonic history. Southern part of this basin is known to contain
favorable conditions for hydrocarbon entrapment. Keeping this in view, a detailed gravity survey network comprising 40 gravity
bases and 1500 data points in an area of about 110 × 100 km
2 was planned in and around Jabera-Damoh region. Analysis of Bouguer and free air gravity anomaly maps, prepared using fractal
based gridding method, indicates presence of two sedimentary basins (Jabera and Damoh) faulted on either sides beside ridge
like features. However, well-known Jabera domal structure appeared to be a shallow feature only. Inversion of gravity data
further reveals presence of 5 to 6 km thick Vindhyan sediments in the Jabera basin which are underlain by Mahakoshal/Bijawar
group of rocks, resting directly over the lower crust, thereby indicating almost total absence of granitic crust from this
region. It appears that due to an underlying thermal anomaly, the entire region may have been subjected to sustained uplift,
deformation, erosion and consequent crustal extension during early to mid Proterozoics which brought high velocity mafic crust
to such shallow levels.
Keywords Gravity studies - Crustal evolution - Lower crust - Fractals - Gravity data inversion - Vindhyan Basin