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pure and applied geophysics

, Volume 138, Issue 1, pp 61–75 | Cite as

MAGSAT data and Curie-depth below Deccan flood basalts (India)

  • P. K. Agrawal
  • N. K. Thakur
  • J. G. Negi
Article

Abstract

Ground and airborne magnetic data are severely disturbed due to random susceptibility variations in Deccan flood basalts. However, Magnetic Satellite (MAGSAT) data over the Deccan flood basaltic region of the Indian subcontinent exhibit filtering of surficial noise. Three passes over Deccan traps show a “low” at about 20°N latitude and a “high” at about 23°N latitude. Spectral analysis of these passes and an available 2-D MAGSAT vertical intensity map indicate a deep (40±4 km) magnetic interface. It is interesting to note that the determination of Curie-depth from MAGSAT matches and confirms the geothermal data model. The estimates correspond to the Moho depth derived from gravity and deep seismic sounding studies. The study suggests a continental shield-like geothermal gradient of about 14°C/km below the area.

Key words

MAGSAT Deccan traps spectral analysis Curie-depth 

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Copyright information

© Birkhäuser Verlag 1992

Authors and Affiliations

  • P. K. Agrawal
    • 1
  • N. K. Thakur
    • 1
  • J. G. Negi
    • 1
  1. 1.Theoretical Geophysics GroupNational Geophysical Research InstituteHyderabadIndia

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