Electrical signatures of the Earth’s crust in central India as inferred from magnetotelluric studyReport as inadecuate




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Earth, Planets and Space

, Volume 63, Issue 12, pp 1175–1182

First Online: 21 February 2012Received: 27 January 2010Revised: 14 June 2011Accepted: 04 August 2011

Abstract

The tectonic scenario of the Narmada-Son Lineament NSL zone has been the subject of debate for the last few decades. It is characterized tectonically as a highly-disturbed zone in Indian geology since Precambrian times. A magnetotelluric MT study has been carried out across the NSL zone along a 270-km-long N-S-trending traverse, extending from Hoshangabad in the North to Ner in the South. As a part of the present study, 25 magnetotelluric soundings have been collected and the data rotated to N70°E after removing local distortions, arising from 3D galvanic effects, using the Groom-Bailey decomposition technique. 2-D inversion has been carried out using an NLCG scheme. The results derived from the 2-D inversion have brought out the highly conductive nature of the mid-lower crust at places coinciding with the known faults. The significant high heat flow and seismicity in the region associated with these faults may be caused by tectonic activity and the highly conductive nature of the mid-lower crust. This may be due to the partial melting of subsurface rocks resulting from the high temperature caused by mantle upwarping in the region. The results are also compared with the gravity and a nearby Deep Seismic Sounding DSS.

Key wordsMagnetotellurics deep crust Narmada-Tapti region electrical conductivity seismotectonics  Download fulltext PDF



Author: G. Dhanunjaya Naidu - K. Veeraswamy - T. Harinarayana

Source: https://link.springer.com/







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