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International Journal of Earth Sciences

, Volume 97, Issue 2, pp 245–256 | Cite as

Heat flow and crustal thermal structure in the Late Archaean Closepet Granite batholith, south India

  • Sukanta Roy
  • Labani Ray
  • Anurup Bhattacharya
  • R. Srinivasan
Original Paper

Abstract

The Late Archaean Closepet Granite batholith in south India is exposed at different crustal levels grading from greenschist facies in the north through amphibolite and granulite facies in the south along a ∼400 km long segment in the Dharwar craton. Two areas, Pavagada and Magadi, located in the Main Mass of the batholith, best represent the granitoid of the greenschist and amphibolite facies crustal levels respectively. Heat flow estimates of 38 mW m−2 from Pavagada and 25 mW m−2 from Magadi have been obtained through measurements in deep (430 and 445 m) and carefully sited boreholes. Measurements made in four boreholes of opportunity in Pavagada area yield a mean heat flow of 39 ± 4 (s.d.) mW m−2, which is in good agreement with the estimate from deep borehole. The study, therefore, demonstrates a clear-cut heat flow variation concomitant with the crustal levels exposed in the two areas. The mean heat production estimates for the greenschist facies and amphibolite facies layers constituting the Main Mass of the batholith are 2.9 and 1.8 μW m−3, respectively. The enhanced heat flow in the Pavagada area is consistent with the occurrence of a radioelement-enriched 2-km-thick greenschist facies layer granitoid overlying the granitoid of the amphibolite facies layer which is twice as thick as represented in the Magadi area. The crustal heat production models indicate similar mantle heat flow estimates in the range 12–14 mW m−2, consistent with the other parts of the greenstone-granite-gneiss terrain of the Dharwar craton.

Keywords

Heat flow Radiogenic heat production Mantle heat flow Exposed crustal cross-section Closepet Granite batholith Dharwar Craton India 

Notes

Acknowledgments

We are grateful to the Department of Science and Technology, Govt. of India, for funding systematic heat flow studies through drilling of deep holes in south India (ESS/16/148/2001). We thank the officers of Central Ground Water Board and Zila Parishad authorities in Karnataka for permission to use their boreholes for measurements and for assistance in selection of suitable sites for deeper drilling. Md. Ahmed and Seshikanth Babu provided invaluable assistance during drilling, sample collection, temperature measurements and preparation of discs for conductivity measurements. We thank Andrea Förster for granting access to the optical scanning, XRF and ICPMS facilities at GFZ Potsdam and for help during measurements. We thank David Chapman, Richard Ketcham and two anonymous reviewers for providing insightful comments on an earlier version of the manuscript. The paper has benefited from constructive reviews by Argo Joeleht and Michael Davis. The study was actively supported and permitted for publication by V.P. Dimri, Director, NGRI.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Sukanta Roy
    • 1
  • Labani Ray
    • 1
  • Anurup Bhattacharya
    • 1
  • R. Srinivasan
    • 1
    • 2
  1. 1.National Geophysical Research InstituteHyderabadIndia
  2. 2.BangaloreIndia

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