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Crustal geoelectric structure of the Indian plate at the western extremity of the Bundelkhand craton and Sharda Depression in the Ganga Basin.

This MT study delineates the crustal geoelectric structure along a 330-km-long profile across the central Ganga Basin covering the western extremity of the Sharda Depression. The significant results are: (i) extension of the concealed Bundelkhand craton (R1) till at least the Yamuna River; (ii) the presence of a super-thick concealed Proterozoic rift basin (C1b) also in the western part of the Sharda Depression; and (iii) the presence of a significant high density and electrically conductive anomaly (C2) in the lithospheric mantle of the region north of the concealed Bundelkhand craton.

(a) Geoelectric model of the subsurface down to 80 km depth corresponding to single strike of N105E for the entire profile. (b) Geoelectric model corresponding to composite strikes (N105E for sites 1–25, N135E for sites 26–45). This model is taken as the final model along the profile. (c) Bouguer gravity anomaly (BGA) and elevation data along the profile along with their variations in a swath of 25 km (shaded regions). FB is the southern limit of the foreland basin (from Manglik et al., 2022, Jour. Geol. Soc. India; https://doi.org/10.1007/s12594-022-1928-y).

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