Aeromagnetic study of peninsular India |
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Authors: | P Harikumar Mita Rajaram T S Balakrishnan |
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Institution: | (1) Indian Institute of Geomagnetism, 400 005 Colaba, Mumbai, India |
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Abstract: | The degree sheet Aeromagnetic maps up to 17‡N, acquired from the Geological Survey of India, have been manually redigitised
at 6 minute intervals to study the long wavelength anomalies over peninsular India. These data have been collected at different
survey altitude, epochs, flight line directions, etc. Great care has been taken to correct the total field map and remove
the contribution due to the core field and prepare an accurate crustal anomaly map. For the first time, a regional map, depicting
the NW-SE structural features north of the orthopyroxene isograd with the essentially E-W features to the south of it and
revealing several well known structures, is presented. The analytical signal is calculated to delineate the source fields
of these anomalies. It dramatically maps the charnockites and is able to delineate the orthopyroxene isograd. In the Dharwar
region the magnetic signatures are associated with the intrusives/ iron ore bodies. Thus, we find that the source rocks of
the aeromagnetic anomalies are the host province of charnockites in the SGT and the intrusives/iron ore bodies in the Dharwar
belt. Gravity residuals are calculated and a tectonic map of the region is presented from the combined geopotential data. |
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Keywords: | Aeromagnetic Southern Granulite Terrain IGRF analytical signal metamorphism |
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