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Conference Paper

Seismic imaging of the crust beneath the Aravalli Delhi Fold Belt in Northwestern India

Authors

Nayal,  Deepak
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bandlamudi,  Gowthami
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gollapally,  Mohan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Maurya,  Satish
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gundu,  Santhoshkumar
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

D s,  Saju
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Nayal, D., Bandlamudi, G., Gollapally, M., Maurya, S., Gundu, S., D s, S. (2023): Seismic imaging of the crust beneath the Aravalli Delhi Fold Belt in Northwestern India, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2729


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019162
Abstract
The crust beneath a 250km long NW-SE trending profile across the Proterozoic Aravalli Delhi Fold Belt in northwestern India was imaged through P receiver functions(RF). We used teleseismic data recorded by 25 closely spaced(10-15km) broadband seismographs deployed on the profile passing through the Marwar craton(MC), Delhi fold belt(DFB), banded gneissic complex(BGC) and Vindhyan basin(VB). About 1600 RFs were generated using the iterative time domain deconvolution technique. The H-k grid search reveals the crustal thickness(H) and Vp/Vs(k) to be ranging from 35km to 53km and 1.70 to 1.90 respectively. Common conversion point image reveals lateral variations in the continuity of the Moho and the intra-crustal discontinuities. Crustal thickening upto 53km is observed beneath DFB while a flat Moho is imaged at ≈40km beneath the rest of the profile. A steep, SE dipping moho was imaged beneath DFB that may represent the subduction of the Marwar craton beneath the Aravalli craton in the east. A crustal scale feature dipping NW and extending from moho to the near surface beneath BGC was distinctively imaged that corresponds to the Jahazpur thrust. Low Vp/Vs(≈1.73) reveal a felsic crust beneath BGC while DFB and VB are characterized by high Vp/Vs(≈1.82) indicating an intermediate to mafic crustal composition. Neighbourhood algorithm inversion reveals ≈10km thick, high velocity layer(Vs≈4km/s) at the base of the crust suggesting significant magmatic underplating. Our results correlate very well with those of the deep seismic reflection studies along the same profile and provide additional information on the continuity of the crustal structure and composition.