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MAGSAT data and Curie-depth below Deccan flood basalts (India)
Authors:P K Agrawal  N K Thakur  J G Negi
Institution:(1) Theoretical Geophysics Group, National Geophysical Research Institute, 500 007 Hyderabad, India
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 ldquolowrdquo at about 20°N latitude and a ldquohighrdquo 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.
Keywords:MAGSAT  Deccan traps  spectral analysis  Curie-depth
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