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Delineation of Rajmahal basaltic flows, inter-trappeans and associated coal layers using Audio-magneto-telluric method

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Journal of the Geological Society of India

Abstract

The extensive volcanic activity of Rajmahal occurred during early Cretaceous (~117 Ma). Potentially perspective Gondawana sediments containing coal seam is partially covered by these basalts. Basalts as well as coal are already known to be of immense economic importance over Rajmahal traps. The present study mainly deals with delineation of basaltic lava flows and associated coal layers using the Audio-magneto-telluric (AMT) study in the south central region of Rajmahal traps near Suri, West Bengal, India. Initially, the field situations have been simulated using forward model with top alluvium cover followed by basaltic lava flows, a wedge shaped inter-trappean sedimentary formation with second basaltic lava flows and basement at the bottom. The model was constrained using available litholog. The model study reveals the presence of moderately resistive basalts, relatively conductive inter-trappeans and the basement, except the top alluvium layer and thin inter-trappeans. Subsequently, threeAMT sounding have been carried out over Cholaguria, Hatgacha and Pachami, Suri, West Bengal. The field AMT study reveals three basaltic lava flows with varying thickness from ~40m to ~350m and composite thickness of ~620m to ~640m, which match well with the published borehole litholog. The inter-trappeans have been identified at 500m to 620m, 310m to 400m and 500m to 640m depths over Cholaguria, Hatgacha and Pachami, respectively. It is interesting to mention that the identified inter-trappeans are inferred to be coal/shaly-coal which are matching very well with the published borehole lithologs.

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  1. Department of Applied Geophysics, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826 004, India

    Piyush Priyam & S. K. Pal

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  1. Piyush Priyam
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Priyam, P., Pal, S.K. Delineation of Rajmahal basaltic flows, inter-trappeans and associated coal layers using Audio-magneto-telluric method. J Geol Soc India 90, 25–31 (2017). https://doi.org/10.1007/s12594-017-0660-5

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  • DOI: https://doi.org/10.1007/s12594-017-0660-5

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