Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

T. S. Ramakrishna ¹, A. Y. S. R. Chayanulu ¹

Affiliations
1 Geological Survey of India, Hyderabad 500 001, IN

Abstract

Out of the six Purana basins, namely Cuddapah, Kaladgi, Bhima, Pakhal, Chattisgarh and Vindhyan, Cuddapah, Pakhal and Chattisgarh appear to be filled with rocks of higher than normal density, whereas the other three comprise low density rocks. Their gravity picture, however, are not found to be simple highs or lows as to be expected from their densities but are distorted by both deepseated causes as in the case of Cuddapah, Chattisgarh and Vindhyan basins, as well as the overlying sediments as in the case of Pakhal basin. Major earth movements appear to have been associated with Cuddapah, Pakhal, Vindhyan and Chattisgarh basins whereas Kaladgi and Bhima basins represent mere depressions. The thickness of sediments in these basins is estimated to vary from 2 to 10 km.

Full Text

     

A. Y. S. R. Chayanulu ¹, R. K. Singh ¹

Affiliations
1 Geological Survey of India, Bandlaguda Complex, Hyderabad 500660, IN

Abstract

Detailed magnetic (V. F.) and electrical resistivity surveys led to the discovery of one more hidden kimberlite pipe (P8) of dimensions 110 x 55m to the northeast of the known pipe P4 in Lattavaram area, Anantapur district, Andhra Pradesh. Detailed geophysical surveys can profitably be used for the location of hidden kimberlite bodies, in selected areas.

Keywords

Geophysical Surveys, kimberlites, Lattavaram, Andhra Pradesh.

Full Text