Seismically imaged shallow and deep crustal structure and potential field anomalies across the Eastern Dharwar Craton, south Indian shield: Possible geodynamical implications

摘要: Abstract The time-bound crustal evolution and subsequent deformation of the Cuddapah basin, Nellore Schist Belt Eastern Ghats terrain Dharwar Craton, which have undergone sustained geodynamic upheavals since almost 2.0 billion years, remain enigmatic. An attempt is made here to integrate newly available potential field data other geophysical anomalies with deep seismic structure, examine generative mechanism major features, associated this sector. Our study indicates that initial extent basin sedimentation may been much larger, extending by 50–60 km west Tadipatri during Paleoproterozoic period, subsequently shrank due massive erosion following thermal uplift, caused SW mantle plume. Below region, crust still quite warm Moho temperatures exceeding 500 °C. Similarly, Nallamalai Fold rocks, bounded two faults extremely low gravity, occupied a large in western also, before their abrasion. No signatures thrusting are presently seen below thus it could not be an alien either. In contrast, strikingly high positive possibly conspicuous horst structure up dipping mafic layers underneath, resulted India-east Antarctica collision after cessation prolonged subduction (1.6–0.95 Ga). Further, gravity would confirm presence totally distinct geological east but trace all together missing. Instead, signatures, point out Proterozoic sedimentary terrain, Belt. It likely Prorerozoic was larger than thought today. addition, seismically detected Gondwana over Belt, apart from some recently discovered similar subsurface occurrences intracratonic parts, indicate Craton rifting even thereby challenging long held view cratonic stability.