Abstract
The present study confirms the well-known POGO and MAGSAT anomalies showing a broad magnetic “high” on the Indian shield and a broad “low” over the Himalayas. A characteristic difference in magnetic signatures over the Peshawar Himalaya (a broad “high”), the Punjab Himalaya (a broad “low”) and the Kumaun Himalaya, north of Sarda depression (a sharp and deeper low), indicates the existence of different blocks in the Himalayas. The short wavelength “low” over the rifted region of the Narmada-Son lineament can be interpreted as a reflection of an ancient suture zone. Interestingly, the surface Bouguer gravity picture shows an inverse correlation with MAGSAT anomalies over Peninsular India and a positive correlation over the Himalayan region. Quantitative model estimates from the observed satellite-magnetic and surface gravity data have revealed compositional changes in the peninsular India and thickening of magnetic crust in the Himalayas.
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