1887
Volume 8, Issue 3
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

A Bouguer anomaly map of India prepared from some 30,000 point gravity values brings out a number of zones of gravity “highs” and “lows”. These are well correlated with the regional geology of the country. Significantly some of the “highs” or their slopes are associated with the well known mineralized districts of Aravallis in western India, the Hazari-bagh Plateau of eastern India, the Panna-Narmada region in Central India, and the greenstone associated mineralization in Karnataka in South India.

About one hundred and seventy line kilometres of integrated airborne geophysical surveys were conducted in India during 1967-1971. A comparison of the areas flown with the recently prepared Bouguer anomaly map shows that almost all the areas fall over regions of gravity “highs” or off their slopes on steep gradients. Apart from its tectonic significance this correlation bears a useful approach to mineral search.

A comparative study of gravity material with tectono-stratigraphy and mineralization suggests that gravity surveys can be used as a reconnaissance tool in seeking extensions of some litho-stratigraphic horizons of economic interest beneath covers.

This approach was utilised in selecting areas for an integrated airborne geophysical survey. Interestingly the surveys in the two selected regions have picked aeromagnetic as well as electromagnetic anomalies. A ground check coupled with earlier photogeologic mapping has revealed some zones of possible mineralization associated with the geophysical indications.

A regional magnetic (vertical force) anomaly map based on field observations at a spacing of about 30 kms by the Survey of India also brings out some major magnetic lineations which compare well in some cases with the regional gravity anomalies. However in some areas they depart substantially from gravity trends. In such areas the basement seems to be different magnetically while having more or less the same density. An interesting zone of an EIME orientation is found to occur from the India-Pakistan

© 1977 ASEG
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1977-09-01
2026-01-21

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References

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