A tentative 2D thermal model of central India across the Narmada-Son Lineament (NSL)

Rai, S.N.; Thiagarajan, S.

doi:10.1016/j.jseaes.2005.10.014

Cited by 17 publications

(8 citation statements)

References 33 publications

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“…Hence, this mode of heat transfer is generally considered in crustal thermal modeling. A finite element based numerical program named Numerically Integrated System Analysis (NISA), is used for computation of the 2-D crustal thermal structure by solving the 2-D steady state heat conduction equation (Rai and Thiagarajan 2006). For modeling purpose the entire area of the model is divided into a network of four nodes quadrilateral elements with 10 km length in X-direction.…”

Section: Mathematical Modelingmentioning

confidence: 99%

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2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

Thiagarajan

2007

J Earth Syst Sci

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Central India is traversed by a WSW-ENE trending Narmada-Son lineament (NSL) which is characterized by the presence of numerous hot springs, feeder dykes for Deccan Traps and seismicity all along its length. It is divided in two parts by the Barwani-Sukta Fault (BSF). To the west of this fault a graben exists, whereas to the east the basement is uplifted between Narmada North Fault (NNF) and Narmada South Fault (NSF). The present work deals with the 2-D thermal modeling to delineate the crustal thermal structure of the western part of NSL region along the Thuadara-Sindad Deep Seismic Sounding (DSS) profile which runs almost in the N-S direction across the NSL. Numerical results of the model reveal that the conductive surface heat flow value in the region under consideration varies between 45 and 47 mW/m 2 . Out of which 23 mW/m 2 is the contribution from the mantle heat flow and the remaining from within the crust. The Curie depth is found to vary between 46 and 47 km and is in close agreement with the earlier reported Curie depth estimated from the analysis of MAGSAT data. The Moho temperature varies between 470 and 500 • C. This study suggests that this western part of central Indian region is characterized by low mantle heat flow which in turn makes the lower crust brittle and amenable to the occurrence of deep focused earthquakes such as Satpura (1938) earthquake.

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Section: Mathematical Modelingmentioning

confidence: 99%

“…More details of mathematical modeling procedure is given in Rai et al (2003) and Rai and Thiagarajan (2006).…”

Section: Mathematical Modelingmentioning

confidence: 99%

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

Thiagarajan

2007

J Earth Syst Sci

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“…The present day temperatureedepth profile shows maximum temperature near the crustemantle boundary (w40 km) as around 600 C ( Fig. 6a, b) (Rai and Thiagarajan, 2006). Ambient temperature derived from mantle xenoliths for the same depths is about 1200 C (Dessai et al, 2010) (Fig.…”

Section: Previous Geophysical Studiesmentioning

confidence: 87%

Geophysical signatures of fluids in a reactivated Precambrian collisional suture in central India

Naganjaneyulu

Santosh

2011

Geoscience Frontiers

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The Central India Tectonic Zone (CITZ) marks the trace of a major suture zone along which the south Indian and the north Indian continental blocks were assembled through subduction-accretioncollision tectonics in the Mesoproterozoic. The CITZ also witnessed the major, plume-related, late Cretaceous Deccan volcanic activity, covering substantial parts of the region with continental flood basalts and associated magmatic provinces. A number of major fault zones dissect the region, some of which are seismically active. Here we present results from gravity modeling along five regional profiles in the CITZ, and combine these results with magnetotelluric (MT) modeling results to explain the crustal architecture. The models show a resistive (more than 2000 U$m) and a normal density (2.70 g/cm 3 ) upper crust suggesting dominant tonaliteetrondhjemiteegranodiorite (TTG) composition. There is a marked correlation between both high-density (2.95 g/cm 3 ) and low-density (2.65 g/cm 3 ) regions with high conductive zones (<80 U$m) in the deep crust. We infer the presence of an interconnected grain boundary network of fluids or fluid-hosted structures, where the conductors are associated with gravity lows. Based on the conductive nature, we propose that the lower crustal rocks are fluid reservoirs, where the fluids occur as trapped phase within minerals, fluid-filled porosity, or as fluid-rich structural conduits. We envisage that substantial volume of fluids were transferred from mantle into the lower crust through the younger plume-related Deccan volcanism, as well as the reactivation, fracturing and expulsion of fluids transported to depth

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“…• C at a depth of 20 km (see Rai and Thiagarajan, 2006). Free water will evaporate from the rocks at a temperature around 250…”

Section: Discussionmentioning

confidence: 99%

Granitic and magmatic bodies in the deep crust of the Son Narmada Region, Central India: constraints from seismic, gravity and magnetotelluric methods

Naganjaneyulu

2010

Earth Planet Sp

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Magnetotelluric (MT) data at 24 locations in the Son Narmada region, Central India, were collected across the Tapti North Fault and Son Narmada Fault along the Chinchpada-Godhra profile (220 km). MT impedance tensors were then estimated in the period range 0.001-1,000 s using robust processing codes. The N70• E geo-electric strike direction was obtained by multi-site, multi-frequency analysis. The data were modeled using non-linear conjugate gradient scheme taking both apparent resistivity and phase into account. The two-dimensional MT model obtained (after static shift correction) represents resistive bodies (1,000-3,000 ohm-m) and conductive bodies (<20 ohm-m) in the deep crust. The resistive bodies in the lower crust are interpreted to be granitic intrusive complexes. The conductor on the south of Son Narmada Fault is attributed to the presence of magmatic bodies due to underplating, and the conductor on the north as due to the presence of fluids. The highly resistive (>2,000 ohm-m) upper crust is interpreted to comprise felsic rocks of granitic composition, and the low-resistive (<100 ohm-m) deep crust as being composed of dense mafic granulites. The Domal upwarp structure near Son Narmada Fault, with a thick felsic crust sandwiched between the mafic and intermediate crust, can be explained by underplated sediments/felsic crust which jacked-up the lithounits above.

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A tentative 2D thermal model of central India across the Narmada-Son Lineament (NSL)

Cited by 17 publications

References 33 publications

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

2-D Crustal thermal structure along Thuadara-Sindad DSS profile across Narmada-Son lineament, central India

Geophysical signatures of fluids in a reactivated Precambrian collisional suture in central India

Granitic and magmatic bodies in the deep crust of the Son Narmada Region, Central India: constraints from seismic, gravity and magnetotelluric methods

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