A non-uniform thin sheet model for geomagnetic induction anomalies in central India

Arora, B. R. ; Kaikkonen, P. ; Mahashabde, M. V. ; Waghmare, S. Y. (1993) A non-uniform thin sheet model for geomagnetic induction anomalies in central India Physics of the Earth and Planetary Interiors, 81 (1-4). pp. 201-213. ISSN 0031-9201

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/003192...

Related URL: http://dx.doi.org/10.1016/0031-9201(93)90131-R


A non-uniform thin sheet model has been developed to account for the geomagnetic induction anomalies revealed by a magnetometer array study over central India. The conductance distribution map indicates three conductive zones; the first beneath the Satpura, the second appearing as a NW-SE continuation of the Godavari graben, and the third an arcuate conductivity zone in the vicinity of Sehore. The surface and near-surface sedimentary basins, known from earlier gravity and deep seismic sounding studies, cannot provide the estimated conductance for the different conductors. Collation of a variety of geographical data, including heat flow, suggests that heat fluxes characterizing the region are sufficient to cause partial melting at the crust-mantle interface and to initiate metamorphic dehydration leading to a release of fluids at mid-crustal levels. The characteristics of the regional gravity anomaly-absence of a low-velocity zone at the base of crust, as against the presence of the large number of a discontinuous reflectors in the mid-crust-favour a fluid phase as the likely mechanism for the mapped high-conductivity zones.

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