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Shallow subsurface geoelectric structure of the central Ganga Basin by magnetotellurics: A proxy for basin-scale changes in the sedimentary environment.

Manglik A, Thiagarajan S, Suresh M, Chakravarthi NN, Babu MD, Pavankumar G, Adilakshmi, L.

NEAR SURFACE GEOPHYSICS

https://doi.org/10.1002/nsg.70003 

A thick succession of alluvial sediments and the rocks of the Shiwalik Group in the Ganga Basin hold clues to the tectonic and climatic factors that controlled the interaction between the Himalayan orogen and the foreland basin. The present study demonstrates the efficacy of the MT method in mapping sedimentary stratigraphy and deep aquifers to ~2 km depth using high frequency (10 kHz–1 Hz) data. A significant result is delineation of a prominent high conductivity clay/silt dominated 80–100 m thick layer in the southern part of the interfluve region between the Yamuna and the Ganga Rivers and its thickening to about 300 m in the northern part. Another significant result is from the northern part of the basin where upward coarsening of the Shiwalik Group is obtained. These results offer insights for both mapping of deep groundwater resources and understanding climate-tectonic interaction.

Spatial variation of the electrical resistivity at different depths obtained by combining model results of four MT profiles.

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