Analyses of total magnetic anomalies over the northeastern marginal part of Deccan traps and adjoining areas of Central India

Abstract

Detailed ground magnetic survey has been carried out with the station spacing of 2 to 5 km around Jabalpur-Mandala region. Strong magnetic anomalies are observed in the adjoining areas of Jabalpur-Mandala and adjoining areas of Central India. The anomalies are generally closed and aligned in the E-W to NE-SW direction. Magnetic interpretation predicts an average thickness of 0.6 km for the Deccan traps, besides bringing out shallow and deeper intrusive bodies at 1.5 and 4.5 km, respectively. The average thickness of the trap is in good agreement with DSS (Deep Seismic Sounding) and magnetotelluric results. 2-D modelling along six profiles also suggests a number of sheet and dyke-like structures to be present in the region up to a depth of 4.7 km. It is inferred that many zones of weakness along the E-W to NE-SW direction might have existed prior to the Deccan traps volcanism, along which several intrusives.