Seismic Imaging Along Alampur–Koniki–Ganapeswaram Profile, North Cuddapah Basin (India) and East Antarctica Correlation

Geologically complex Proterozoic Cuddapah basin and its environs, have played a vital role in the geodynamic evolution of the India-east Antarctica terrain during Columbia, Rodinia and Gondwana supercontinental assembly periods. In the present study, we investigate subsurface crustal seismic structu...

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Bibliographic Details
Published in:Pure and applied geophysics 2024-03, Vol.181 (3), p.847-874
Main Authors: Chandrakala, K., Pandey, O. P., Mandal, Biswajit, Renuka, K., Kumar, N. Prem
Format: Article
Language:English
Subjects:
Alluvial deposits
Alluvium
Assembly
Data acquisition
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Gondwana
Ocean basins
Precambrian
Reprocessing
Rifting
Schist
Schists
Sediment
Sedimentary basins
Sediments
Seismic data
Seismicity
Seismological data
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Summary:Geologically complex Proterozoic Cuddapah basin and its environs, have played a vital role in the geodynamic evolution of the India-east Antarctica terrain during Columbia, Rodinia and Gondwana supercontinental assembly periods. In the present study, we investigate subsurface crustal seismic structure of the north Cuddapah basin, by reprocessing seismic data, acquired along 325 km long Alampur–Koniki–Ganapeswaram profile. The study depicted a thin veneer of alluvium (2.00–2.90 km/s), underlain by the Gondwana (4.00 km/s) and upper (5.00–5.20 km/s) and lower (5.50–5.70 km/s) Proterozoic sediments in East Coast Sedimentary Basin. Similarly, in the fault-bounded Cuddapah basin, upper and lower Cuddapah sediments are characterised by velocities 5.05–5.10 km/s and 5.50–5.70 km/s with combined thickness of 2.8 km in Kurnool basin and 1.9 km in Nallamalai basin. They rest directly over crystalline basement (5.90–6.05 km/s), underlain further by mid-crustal layer (6.20–6.30 km/s) located at depths of 5–15 km. Massive mid-crustal exhumation in the form of a prominent hidden ridge structure below Darsi and Addanki regions of Nellore Schist and Eastern Ghats Belts is imaged, which is ascribed to India-East Antarctic collision. The studied region coincides with anomalous thermal field, shallow LAB, up-dipping of over-thrusted layers and active seismicity. Possibly, a marginal ocean basin existed in this region during the Columbia and Rodinia supercontinent assembly periods, which underwent successive rifting episodes during Paleo-Mesoproterozoic Era. This study confirms that the Proterozoic sedimentation was much more intense and more widespread, than presently known.
ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-024-03428-w