Heat flow in the trans-aravalli igneous suite, Tusham, India

Sundar, A.; Gupta, Mohan L.; Sharma, Somya

doi:10.1016/0264-3707(90)90025-p

Cited by 25 publications

(11 citation statements)

References 17 publications

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“…Such a low Poisson's ratio is inferred to be due to the presence of a predominantly quartz‐rich, felsic crust beneath the NE part of the Aravalli shield. This is further supported by the observed high heat flow (96 mWm −2 ) in this region (Sundar et al , ). Furthermore, Jagadeesh and Rai () correlated the Moho topography and felsic crust beneath this craton with the features typical of a deformed primitive crust.…”

Section: Geophysical Studiessupporting

confidence: 66%

“…Key map showing various suture zones in the Indian shield region. Heat flow values (Sundar et al , ), seismic reflection profile (Tewari et al , ), seismic receiver function locations (Jagadeesh and Rai, ), gravity profile (A–B; Porwal et al , ), contours showing lithospheric thickness (modified after Negi et al , ) derived from heat flow studies are also shown. This figure is available in colour online at wileyonlinelibrary.com/journal/gj…”

Section: Introductionmentioning

confidence: 99%

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Tracing the Proterozoic continental collision in NW India: a geophysical approach

Naganjaneyulu

Santosh

2011

Geological Journal

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The 800 km-long Aravalli-Delhi Fold Belt (ADFB) in the Aravalli Mountains of Rajasthan defines the largest tectonic feature in the northwestern (NW) Indian shield, situated between the late Proterozoic Marwar Basin in the west and the Vindhyan Basin in the east. The final collision between the Aravalli and Delhi domains defining ocean closure and continental amalgamation is critical in understanding the culmination of the Proterozoic Wilson Cycle in NW India. We present for the first time a regional three-dimensional (3-D) gravity model to evaluate the architecture of the continental collision signature of this region. The deep seismic reflection data along a 400 km-long profile across the ADFB highlights two sets of reflection bands with opposite dips. The prominent west-dipping reflections observed in the central domain, towards the western margin of the Mangalwar Complex could be related to the Palaeoproterozoic subduction of an oceanic lithosphere, and suggest a clear northwestward subduction polarity. The data showing gravity highs, the high elevation features, and the models proposed in the present study, together with the presence of high-density bodies in the deep crust, is interpreted as a signature of magmatic underplating and/or mafic-ultramafic intrusives. The high elevations and corresponding high-density anomalies at depth can also be explained by domal uplift, following the extrusion of metamorphic orogens into the mid crust, as well as the presence of eclogitized material at depth associated with the subduction-collision tectonics and continental amalgamation.

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Section: Geophysical Studiessupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Tracing the Proterozoic continental collision in NW India: a geophysical approach

Naganjaneyulu

Santosh

2011

Geological Journal

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“…Regionally extensive sampling for heat production has not been carried out in the region. Nonetheless, heat production estimates on basement rocks are available from a number of heat flow sites in the Aravali and Singbhum provinces, and in situ measurements in a few areas in the Bastar and Bundelkhand cratons [ Rao and Rao , 1974; Rao et al , 1976; Kochar , 1983, 1988; Sundar et al , 1990; Roy and Rao , 2000; Menon et al , 2002]. The data reveal, in general, very high levels of heat production that, if persistent to depths of a few kilometers, could explain the high heat flow in the region.…”

Section: Constraints From Heat Flux and Heat Production Datamentioning

confidence: 99%

Constraints on the deep thermal structure of the Dharwar craton, India, from heat flow, shear wave velocities, and mantle xenoliths

Roy

Mareschal

2011

J. Geophys. Res.

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[1] We have used constraints from seismic shear wave vertical velocity profiles, geothermobarometry estimates on mantle xenoliths, and surface heat flux and heat production measurements to analyze the thermal regime of the deep lithosphere beneath India. In the Dharwar craton of southern India, the shear wave velocity gradient in the mantle, as well as xenolith geothermobarometry data, suggests a low mantle heat flux, 14-20 mW m −2 , consistent with surface heat flux measurements. However, for standard cratonic mantle composition, seismic velocities require Moho and mantle temperatures to be about 300 K higher than inferred from heat flux and xenolith data. This discrepancy can be only resolved by changing the mantle composition, specifically by increasing the Fe number. The shear wave velocities are highest beneath north central India, where calculated S wave travel times are 2 s shorter than in the Dharwar craton. These differences in traveltime and the very steep gradient in the shear wave velocity profiles in north central India cannot be explained by variations in mantle temperature but require differences in mantle composition.Citation: Roy, S., and J.-C. Mareschal (2011), Constraints on the deep thermal structure of the Dharwar craton, India, from heat flow, shear wave velocities, and mantle xenoliths,

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“…The use of unregularized least-squares in inverse calculations will usually result in models which have more structures than is required to fit the data (SCALES et al, 1990). It can be dangerous to make inferences based on these features since they cannot be REPORT (1969REPORT ( -1970, GUPTA and RAO (1970), VERMA and GUPTA (1975), RAO et al (1979), GUPTA (1981), RAO and RAO (1983), GUPTA and GAUR (1984), GUPTA et al (1988), SUNDER et al (1990), POLLACK et al (1991), NEGI et al (1992 and GUPTA et al (1993). said to be determined by the data. However, in view of the nature of the response curve and the validity of the data (as described earlier in the section on ''The Data and Limitations''), it may be reasoned that this model has no more features than are required to be fit, determined by the data and thus cannot be treated as an artifact unrepresentative of the data.…”

Section: Resultsmentioning

confidence: 99%

Simulated Annealing 2-D Nonlinear Inversion of Geomagnetic Deep Sounding Data Near Ujjain-Guna, India

Prasad

1999

Pure and Applied Geophysics

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An attempt has been made to use the global optimization technique of Simulated Annealing (S.A.) inversion to interpret the conductivity structure derived from the geomagnetic deep sounding data of N-W India. The present results supersede the earlier result obtained by 2-D conventional linearized inversion. The earlier linearized inversion, following an iterative gradient search technique on the same data set, has been re-evaluated and further constrained through an exhaustive search of the parameter space. The conductive response of an hypothesized conductor located between Ujjain and Guna, India, has been modelled by this random search tool. The location of the proposed model is now in agreement with the theory, since the conductive bodies are centered exactly below the center of the response function. In an earlier attempt by linearized inversion, this was not feasible. The central body is located at a depth of 19 km from the surface, suggesting a thickness of 15 km and resistivity of 14 ohm.m. The resistivity contrast of this ensemble of conductive bodies with the background varies by a factor of 100 to 385. This low conductivity contrast with respect to the background is in conformity to the low temperature as inferred from the available heat-flow data in the region. A marginally different estimate of the conductivity (normally mid-crustal conductors are assigned conductivities of the order of 50 to 200 ohm.m) for the mid-crustal conductor has been found. Existence of a mid-crustal conductor is clearly indicated which was also not detected in the earlier study. Low geo-temperature gradients existing in the region rule out the possibility of a thermal origin for this mid-crustal conductor. A likely explanation could be due to the presence of graphitic carbon at lower crustal depths. However, the role of electrolytic fluid present in the interconnected pore -spaces of rocks may be another tangible explanation.

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Heat flow in the trans-aravalli igneous suite, Tusham, India

Cited by 25 publications

References 17 publications

Tracing the Proterozoic continental collision in NW India: a geophysical approach

Tracing the Proterozoic continental collision in NW India: a geophysical approach

Constraints on the deep thermal structure of the Dharwar craton, India, from heat flow, shear wave velocities, and mantle xenoliths

Simulated Annealing 2-D Nonlinear Inversion of Geomagnetic Deep Sounding Data Near Ujjain-Guna, India

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