Some interesting observations on the tectonics in the deccan volcanic province observed from Magnetotelluric studies

Abstract

Magnetotelluric studies in the northern DVP near Nasik have delineated a deep seated thrust zone, indicative of the compressional tectonics prior to the Deccan volcanism, where as, in the region around Koyna to the south an extensional tectonic regime is observed. The Panvel flexure is a major feature along the western margin, which may have been formed prior to the eruption of the Deccan volcanics, although the vertical movements may still be persisting due to the loading of the volcanics as well as the erosional unloading. Our studies indicate that different parts of the NS trending Panvel flexure may have been formed due to different tectonic and intrusive processes. An approximately NW-SE trending high conductivity (100 Ω-m) is delineated at depth of 60 km and beyond. This seems to be extending to the south beneath the Dharwar craton and seems to be due to the passage of the Indian plate over the Reunion hot spot.