A Re-Examination of the Crustal Structure Across Narmada-Son-Lineament (NSL), Madhya Pradesh, Central India using Magnetotelluric and Gravity Modeling

摘要

The Narmada-Son-Lineament (NSL) in the Central Indian Shield (CIS) is a profound crustal discontinuity, reactivated several times in the geologic past with left lateral transcurrent motion. These episodic reactivations have produced many graben/horst structures. The bounding faults of some of these younger morphotectonic units viz. the Narmada South Fault (NSF), have produced earthquakes of (M 6.0) in Jabalpur and swarms of earthquakes in Pandhana.Abnormally high heat flow is seen over the Satpura horst, south of NSL. High heat flow is normally accompanied by higher crustal electrical conductivity at depth. This paper is an attempt to re-examine the crustal structure of the northern part of the CIS, through MT and gravity studies, over a few selected transects in the area.