Abstract:
The Central Indian region has a complex geology covering the Godavari Graben, the
Bastar Craton (including the Chhattisgarh Basin), the Eastern Ghat Mobile Belt, the
Mahanadi Graben and some part of the Deccan Trap, the northern Singhbhum Orogen
and the eastern Dharwar Craton. The region is well covered by reconnaissancescale
aeromagnetic data, analysed for the estimation of basement and shallow anomalous
magnetic sources depth using scaling spectral method. The shallow magnetic
anomalies are found to vary from 1 to 3 km, whereas magnetic basement depth
values are found to vary from 2 to 7 km. The shallowest basement depth of 2 km
corresponds to the Kanker granites, a part of the Bastar Craton, whereas the deepest
basement depth of 7 km is for the Godavari Basin and the southeastern part of
the Eastern Ghat Mobile Belt near the Parvatipuram Bobbili fault. The estimated
basement depth values correlate well with the values found from earlier geophysical
studies. The earlier geophysical studies are limited to few tectonic units, whereas our
estimation provides detailed magnetic basement mapping in the region. The magnetic
basement and shallow depth values in the region indicate complex tectonic, heterogeneity,
and intrusive bodies at different depths, which can be attributed to different
thermo-tectonic processes since Precambrian.
