Inversion of Magnetic and Gravity Data in the Indian Region

  1. Robert F. Mereu,
  2. Stephan Mueller and
  3. David M. Fountain
  1. B. P. Singh,
  2. Mita Rajaram and
  3. N. Basavaiah

Published Online: 9 APR 2013

DOI: 10.1029/GM051p0271

Properties and Processes of Earth's Lower Crust

Properties and Processes of Earth's Lower Crust

How to Cite

Singh, B. P., Rajaram, M. and Basavaiah, N. (1989) Inversion of Magnetic and Gravity Data in the Indian Region, in Properties and Processes of Earth's Lower Crust (eds R. F. Mereu, S. Mueller and D. M. Fountain), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM051p0271

Author Information

  1. Indian Institute of Geomagnetism, Colaba, Bombay 400 005 India

Publication History

  1. Published Online: 9 APR 2013
  2. Published Print: 1 JAN 1989

ISBN Information

Print ISBN: 9780875904566

Online ISBN: 9781118666388

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Keywords:

  • Earth—Crust—Congresses;
  • Geophysics—Congresses

Summary

The study is based on the premise that long-wavelength magnetic field anomalies can characterize the nature of the lower crust. Magnetisation obtained from inversion of the MAGSAT Z-anomaly clearly demarcates the five Archean-Proterozoic foldbelts that form the basement of the Indian platform. the difference in character of these five foldbelts appears to extend into the lower crust. of the five, the three oldest ones are areas of positive magnetisation contrasts, and the remaining two are areas of negative magnetisation. the earlier suggestion of a lowering of the Curie isotherm beneath the Dharwar craton seems correct. That the Peninsular shield, the Ganga basin and the Himalayas are three different geotectonic blocks is clearly reflected in the magnetisation distribution. Flexuring of the crust under the Ganga basin due to root formation of the Himalayas is supported by the study. Areas of negative magnetisation over the south Indian region seem to be associated with a thin crust, high heat flow or seismotectonic activity. In general, gravity anomaly and heat flow data agree characteristically well with the magnetisation distribution.