Neoproterozoic Intracratonic Basins in Peninsular India

Abstract

There was a pronounced interruption of sedimentation in the Purana basins of Cuddapah, Kaladgi, Godavari and Vindhyan in the period 1000 ± 50 Ma. This interruption is represented by, as already stated, a regional unconformity above the Mesoproterozoic sedimentary successions in all these basins. It was a result of the tectonic upheaval. Both the Aravali–Satpura orogenic belt and the Eastern Ghat Mobile Belt were overtaken by tectonothermal developments in the period 1050 and 950 Ma. This development had an impact on the Purana basins. The Somanpalli, Penganga and Yellandapad areas of the Godavari basin were subjected to folding and thrusting. Sedimentation halted in all basins and then followed a period of pronounced erosion before its resumption. Much larger areas came under the sway of sedimentation as new regions sank, giving rise to the Bhima, Indravati and Chhattisgarh basins. In the north, the sedimentation expended beyond the limits of the Vindhyan Basin and encompassed parts of the Indo-Gangetic domain.