Deep seismic reflection study over the Vindhyans of Rajasthan: Implications for geophysical setting of the basin

摘要

This paper presents results of high-resolution deep seismic re???ection pro???ling of the Proterozoic Vindhyan basin of the Rajasthan area along the Chandli a€“Bundi a€“Kota a€“Kunjer pro ???le.Seismic images have been used to estimate the thickness of Vindhyan strata as well as to understand the tectonic framework of the basin.The results are constrained by gravity,magnetic and magne-totelluric data.The study reveals gentle SE-dipping re???ection bands representing the Vindhyan strata.The seismic sections depict gradual thickening of the Vindhyan succession towards south-east from Bundi.The velocities of the upper and lower Vindhyans are identi???ed as 4.6 a€“4.8 km/s and 5.1 a€“5.3 km/s.The NW limit of the Vindhyan basin is demarcated by the Great Boundary Fault (GBF)that manifests as a 30 km wide NW dipping thrust fault extending to a depth of 30 km.