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A Bouguer anomaly map of India and its relation to broad tectonic elements of the sub-continent

1980; Oxford University Press; Volume: 61; Issue: 2 Linguagem: Inglês

10.1111/j.1365-246x.1980.tb04314.x

1365-246X

M. N. Qureshy, W. E. K. Warsi,

Geophysical and Geoelectrical Methods

A new Bouguer anomaly map of India and its generalized interpretation is presented in this paper. Bouguer anomalies in India show good correlation with the geology and tectonics. Isostatic anomalies in India are primarily geologic anomalies caused by intracrustal inhomogeneities. For example, the negative isostatic anomalies in southern India arise from large thicknesses of granitic bodies in the upper crust and the positive anomaly over the Himalaya may be attributed to a possible thickening of the basalt layer in the lower crust. The gravity data suggest that an overall isostatic equilibrium generally prevails in India and the Himalayan region. Crustal thickness estimates from DSS data in India are comparable to the values obtained from gravity data based on the Airy's concept of isostatic compensation.