Nature of continental crust along the Narmada—Son Lineament inferred from gravity and deep seismic sounding data

Verma, R. K.; Banerjee, Paramesh

doi:10.1016/0040-1951(92)90121-l

Cited by 118 publications

(70 citation statements)

References 10 publications

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“…3(a)). The Bouguer anomaly map (Verma and Banerjee, 1992) also shows NW-SE trends in this region. The change in the nature of the anomalies of the potential field data suggests that this region has undergone intense deformation associated with major tectonic activity.…”

Section: Discussionmentioning

confidence: 82%

“…As portrayed in the DSS profiles (Tewari and Prakash Kumar, 2003), the region between the Narmada and Tapti rivers is characterized by basement uplift. The analysis of gravity data (Verma and Banerjee, 1992) also shows a higher density crust in the south in comparison to areas north of F1. It may be possible that the fault F1, is a deep-seated fault involving the Moho, along which DIII have been downthrown with respect to DI.…”

Section: Discussionmentioning

confidence: 85%

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Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Anand

Rajaram

2014

Earth Planet Sp

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Aeromagnetic data analysis over the Narmada-Son Lineament (NSL) shows that prominent anomalies are located over dyke swarms and trap flows and the major formations present have distinct magnetic signatures. A major extensive ENE fault is identified which coincides with the course of the Narmada river and which appears, as earlier suggested, to control Gondwana sedimentation to the south and Vindhyan sedimentation to the north. By isolating the sources, it is found that the signatures of the Deccan traps have a distribution that is possibly related to their time of eruption and subsequent evolution. The region between Hoshangabad (HBD) and Narsimapura (NSR) are made up of two structural units: a shallow ENE structure superposed on a deeper NW-SE feature which is possibly related to the continuation of the Godavari Gondwana Graben towards the northwest. The region north and south of the deep-seated fault F1 has undergone different evolutionary history. The thickness of the magnetic crust in the Narmada-Son region lies between 25 to 31 km, implying a lithological change below this depth. This is borne out by the high velocity layer (7.2 km/s) within the lower crust identified by DSS studies.

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Section: Discussionmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 85%

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Anand

Rajaram

2014

Earth Planet Sp

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“…Figure 5 schematically represents tectonic blocks and magnetic sources as interpreted from the present analysis. In the gravity data, the presence of the Jabalpur gravity high (Verma and Banerjee, 1992) and the uneven/scarce data distribution in this area (NGRI, 1975) has distorted the picture and therefore the gravity anomaly so far has not explicitly identified this shear. Superposition of the interpreted tectonic blocks derived from the aeromagnetic data on the gravity map (NGRI, 1975) depicts a very good match between the two (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…5). From the gravity map (NGRI, 1975;Verma and Banerjee, 1992), it is clear that the shear extends further westwards. The MT data over the Jabalpur Mandla profile (location shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Central Indian tectonics revisited using aeromagnetic data

Rajaram

Anand

2014

Earth Planet Sp

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Aeromagnetic data, covering 600,000 km 2 of Central India, have been analysed for the first time to throw light on the various tectonic blocks of the region, ranging in age from the Archean to the present. Existing geotectonic models are based on inadequate data and studies of relatively small regions. From the aeromagnetic data, we use the analytic signal and Euler deconvolution, to elucidate the subsurface structure of the region and redefine the tectonic elements. Contrary to the belief that the Central Indian shear defines the edge of the Central Indian craton, we find that the Sukinda thrust merges with the Tan shear to demarcate the edge of the Bastar and Eastern Ghat blocks by a shear that extends for approximately 1000 km in length. We call this the Main Peninsular shear. Magnetic anomaly data can thus play a crucial role in understanding the tectonic elements of a region with large surface cover.

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“…Though several geophysical studies have been carried out earlier (Kaila et al, 1985;Verma and Banerjee, 1992;Singh and Meissner, 1995;Tewari and Prakash Kumar, 2003;Mall et al, 2005) including MT studies (Gokarn et al, 2001;Rao et al, 2004;Patro et al, 2005;Harinarayana et al, 2007;Naidu and Harinarayana, 2009) to understand the tectonic scenario of the lineament, the present study has been undertaken in order to add value to the earlier results. A major contribution from the present study is to understand the nature of the crust and mantle structure more clearly and also to examine the electrical signatures of the surface mapped faults such as the Narmada South Fault (NSF), Tapti Fault (TF), Gavligarh Fault (GF) and Purna Fault (PF), etc.…”

Section: Introductionmentioning

confidence: 97%

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

2011

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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).

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Nature of continental crust along the Narmada—Son Lineament inferred from gravity and deep seismic sounding data

Cited by 118 publications

References 10 publications

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Central Indian tectonics revisited using aeromagnetic data

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

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