Magnetotelluric studies across the Kurduwadi gravity feature

Gokarn, S. G.; Rao, C. K.; Singh, B. P.; Nayak, P. N.

doi:10.1016/0031-9201(92)90049-2

Cited by 33 publications

(10 citation statements)

References 6 publications

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“…Several geophysical studies were carried out in the greater area of DVP including gravity (Kailasam et al 1972; Krishna Brahmam & Negi 1973; Tiwari et al 2001), deep seismic sounding (Kaila et al 1981a,b) and magnetotellurics (Gokarn et al 1992). Krishna Brahmam & Negi (1973) interpreted a NW–SE trending gravity ‘low’ passing through Kurduwadi as a subtrappean rift and named it ‘Kurduwadi’ rift.…”

Section: Introductionmentioning

confidence: 99%

Electrical structure of the crust below the Deccan Flood Basalts (India), inferred from magnetotelluric soundings

Patro

Brasse

Sarma

et al. 2005

Geophysical Journal International

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S U M M A R YThe Indian shield has experienced major stable continental region (SCR) earthquakes in the recent past, which occurred in the Deccan Volcanic Province. Until now the deeper crust below the Deccan traps, where thick basaltic layers cover large areas of the Indian shield, remains poorly understood. A magnetotelluric (MT) study covering a broad period range was conducted along a N-S running profile of 330 km length to achieve more insights into the nature of the crustal electrical structure below the flood basalts. After dimensionality analysis and decomposition, 2-D inversions for TE and TM modes were carried out. The basalt cover, characterized by at first glance surprisingly low electrical resistivities, is found to have an average thickness of 400 m with the exception of central parts of the profile where it reaches up to 700 m. The crust is in general highly resistive, but several subvertical zones of enhanced conductivity were delineated in the middle-to-lower crust, which are tentatively explained as images of hidden, partly reactivated faults/fractures of the Precambrian basement. Sensitivity analysis indicates a high resolution of these features. An alternative approach incorporating macro-anisotropy is additionally considered and corresponding 2-D anisotropic forward modelling confirms the existence of successions of conductive dykes in the deep crust.

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Section: Introductionmentioning

confidence: 99%

Electrical structure of the crust below the Deccan Flood Basalts (India), inferred from magnetotelluric soundings

Patro

Brasse

Sarma

et al. 2005

Geophysical Journal International

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“…The corresponding electrical resistivity in this region is higher than 3000 m. Lower crustal resistivities at this depth are observed to be less than 1000 m elsewhere in the south of NSL (Gokarn et al, 2001) and also in the adjoining parts of Deccan volcanic province (Gokarn et al, 1992). Thus the lower crust in the Satpura region seems to be anomalously resistive.…”

Section: Discussionmentioning

confidence: 73%

Electromagnetic imaging of magma across the Narmada Son lineament, central India

et al. 2014

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Wide band magnetotelluric (MT) studies were undertaken over a 130 km long, approximately north-south profile in central India across the Narmada Son lineament (NSL) that runs through Indian peninsula in ENE-WSW direction and its contiguous region. The NSL and its contiguous zone in the study region consists of Narmada graben, Satpura horst and Tapti-Purna graben, which are arranged from north to south as this order within the zone. The obtained deep crustal resistivity structure shows two deep-seated conductive features, which locate below the Tapti River on the southern flank of the Satpura horst (South conductor) and below Dorwa on the Narmada graben (North conductor), respectively. Both conductive features have identical resistivities of 10-200 Ohm-m and extend from 7 km to about 50 km in depth. Integration with gravity, heat flow and the deep seismic reflection studies suggests that these conductive bodies may have different causative factors. The South conductor, which is embedded in a high heat flow and a negative Bouguer gravity anomaly area, seems to be due to magma intrusion into the crust leading to high heat flows in the region. On the contrary, the North conductor is not characterized by high heat flow however seismic reflectors in this region show a domal feature. It is thus conjectured that the north conductive feature may be caused by the tectonic activity and partially molten magma emplacement from the asthenospheric levels into the crust.

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“…In the southern Indian shield region, a few MT studies have been carried out (Gokarn et al, 1992(Gokarn et al, , 2004; Patro and Sarma, Gokarn et al (1992Gokarn et al ( , 2004, Gupta et al (2003), Jagadeesh and Rai (2008), Patro andSarma (2009), Ramesh et al (2010)). Contours showing lithospheric thickness derived from heat flow studies are also shown (modified after Negi et al (1986)).…”

Section: Magnetotelluric Studiesmentioning

confidence: 96%

The nature and thickness of lithosphere beneath the Archean Dharwar Craton, southern India: A magnetotelluric model

Naganjaneyulu

Santosh

2012

Journal of Asian Earth Sciences

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Magnetotelluric studies across the Kurduwadi gravity feature

Cited by 33 publications

References 6 publications

Electrical structure of the crust below the Deccan Flood Basalts (India), inferred from magnetotelluric soundings

Electrical structure of the crust below the Deccan Flood Basalts (India), inferred from magnetotelluric soundings

Electromagnetic imaging of magma across the Narmada Son lineament, central India

The nature and thickness of lithosphere beneath the Archean Dharwar Craton, southern India: A magnetotelluric model

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