Geothermal studies in the Hyderabad granitic region and the crustal thermal structure of the Southern Indian Shield

Gupta, Mohan L.; Sharma, Somya; Sundar, A.; Singh, S. B.

doi:10.1016/0040-1951(87)90233-2

Cited by 41 publications

(13 citation statements)

References 12 publications

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“…Our recent detailed study (Pandey et al, 2002) suggests that highly radioactive granitic layer at Hyderabad does not extend beyond a kilometer or so at depth. For SGT, heat generation Gupta and Rao (1970), Gupta et al (1987Gupta et al ( , 1991, Roy and Rao (2000) and Rao et al (1976Rao et al ( , 2001. NSGT and SSGT denote Northern and Southern block of SGT.…”

Section: Heat Flow Distribution Temperature Regime and Geoelectric Smentioning

confidence: 99%

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Unusual lithospheric structure and evolutionary pattern of the cratonic segments of the South Indian shield

Agrawal

Pandey

2014

Earth Planet Sp

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The southern Indian shield, characterised by several prominent geological and geophysical features, can be divided into three distinct tectonic segments: Western Dharwar craton (WDC), Eastern Dharwar craton (EDC) and Southern Granulite terrain (SGT). With the exception of WDC, the entire crust beneath EDC and SGT has been remobilized several times since their formation during the mid-to late Archeans (3.0-2.5 Ga). In order to understand the evolutionary history of these segments, a multiparametric geological and geophysical study has been made which indicates that the south Indian shield, characterized by a reduced heat flow of 23-38 mW/m 2 has a much thinner (88-163 km) lithosphere compared to ∼200-450 km found in other global shields. In the EDC-SGT terrain, high velocity upper crust is underlain by considerably low mantle velocity with a thick high conductive/low velocity zone sandwiched at mid crustal level. Our study reveals that the entire EDC region is underlain by granulite facies rocks with a density of about 2.85 to 3.16 g/cm 3 at a shallow depth of about 8 km in the southern part and at even shallower depth of about 1 to 2 km below the Hyderabad granitic region in the north. Cratonic mantle lithosphere beneath EDC may contain a highly conductive, anisotropic and hydrous metasomatic zone between the depth of 90 and 105 km where estimated temperatures are in the range of 850-975• C. It is likely that before the early Proterozoic, the entire south Indian shield was a coherent crustal block which subsequently got segmented due to persistent plume-induced episodic thermal reactivations during the last 2.7 Ga. These reactivations led to self destruction of cratonic roots giving rise to negative buoyancy at deeper levels which may have been responsible for crustal remobilisations, followed by regional uplifting and erosion of once substantially thick greenstone belts. Consequently, the crustal column beneath the EDC has become highly evolved and now corresponds closely to SGT at depth.

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Section: Heat Flow Distribution Temperature Regime and Geoelectric Smentioning

confidence: 99%

“…1, 2). This profile runs through the entire breadth of the northern block of SGT In this region, crust has been interpreted as consisting of four Data Source: Gupta et al (1987Gupta et al ( , 1991; Roy and Rao (2000); Gupta and Rao (1970);Rao et al (1976Rao et al ( , 2001; Ray et al (2000).…”

Section: Crustal Velocity Structurementioning

confidence: 99%

Unusual lithospheric structure and evolutionary pattern of the cratonic segments of the South Indian shield

Agrawal

Pandey

2014

Earth Planet Sp

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“…Radioactive heat generation in basalt and sediments is considered to be negligible. Thermal conductivity of granites from southern Indian shield varies between 2.73 and 3.44 Wm À1 K À1 (Gupta et al, 1987). Thermal conductivity (k) and radioactive heat generation (A 0 ) due to granitic basement rock of this area are not available.…”

Section: Geothermal Modelmentioning

confidence: 99%

Tectonics and thermal structure of western Satpura, India

Mall

Sharma

2009

Journal of Asian Earth Sciences

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“…These attributes take a part in computation of temperature distribution with depth within the Basin lithosphere. Table 2 was constructed on the base of geological, geophysical and geochemical studies of the present-day lithosphere of the Indian shield (Gupta et al, 1987;1991;Negi et al, 1986). According to this Table, …”

Section: Modeling Of Burial and Thermal Histories Of The Basinmentioning

confidence: 99%

Evolution of temperature, maturation level and realization of hydrocarbon potential in subtrappean sedimentary complex of the Bombay offshore – Results of 1-D basin modeling

Galushkin

2015

Marine and Petroleum Geology

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Geothermal studies in the Hyderabad granitic region and the crustal thermal structure of the Southern Indian Shield

Cited by 41 publications

References 12 publications

Unusual lithospheric structure and evolutionary pattern of the cratonic segments of the South Indian shield

Unusual lithospheric structure and evolutionary pattern of the cratonic segments of the South Indian shield

Tectonics and thermal structure of western Satpura, India

Evolution of temperature, maturation level and realization of hydrocarbon potential in subtrappean sedimentary complex of the Bombay offshore – Results of 1-D basin modeling

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