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Krishna Brahmam, N.
- Diamond Mines Near Raichur
Authors
1 Department of History, Osmania University, Hyderabad 500 007, IN
2 National Geophysical Research Institute, Hyderabad 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 12 (1984), Pagination: 780-786Abstract
Information relating to diamond mining in Raichur region (Karnataka State, India), as recorded by some foreign and Indian chroniclers in the fifteenth century, is brougbt to light and critically analysed. The places Alibenchi and Nelaha near Raichur are identified as the sites where ancients worked for diamonds. Supporting evidence is furnished by the presence of one diamond, known as 'Raichur Diamond', in the Museum of the Directorate of Department of Mines and Geology (Government of Andhra Pradesh), Hyderabad. The geological implications of this finding are discussed and a detailed geological study of the region for locating kimberlite pipes is suggested.
- Gravity and Seismicity of the Cuddapab Basin and Surrounding Places
Authors
1 National Geophysical Research Institute, Hyderabad 500007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 4 (1989), Pagination: 373-384Abstract
The seismicity reported in the Cuddapah basin and surrounding places is examined in the light of the zones of weaknesses/faults indicated by the Bouguer anomaly map of that region. Most of the epicentres seem to fall in the vicinity of the faults inferred from the gravity data. Gravity data suggests that the Ongole region is a junction of different trends of gravity anomalies which explains the reported seismicity there. A roughly NW-SE trending fault, indicated by gravity, seems to be responsible for the seismicity in Macherla-Vinukonda region. The seismicity and the alignment in a roughly NE-SW direction of the exposed nepheline syenite bodies adjoining the eastern margin of the northeastern part of the Cuddapah basin seem to be associated with a fault inferred from gravity. The seismicity in Nellore region is due to the reactivation of faults associated with the buried sedimentary basin which is detected by gravity and confirmed by bore-hole data. The bordering faults of the Palar basin, whose configuration is clearly delineated through gravity, are responsible for the seismicity reported there. A major part, at least, of the main thrust fault of the eastern margin of tbe Cuddapah basin does not seem to be seismically active.- Gravity Atlas of Rajasthan and Gujarat
Authors
1 National Geophysical Research Institute, Uppal Road, Hyderabad 500007., IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 6 (1989), Pagination: 670-671Abstract
No Abstract.Full Text
- Inference of Granitic Batholiths by Gravity Studies in South India
Authors
1 National Geophysical Research Institute, Hyderabad, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 17, No 1 (1976), Pagination: 45-53Abstract
Three well-defined gravity 'lows' in Kodaikanal, Gudalur and Erode regions are explained as due to granitic batholiths at depth. The scattered outcrops of granitic bodies exposed in these regions are suggested to be interconnected at depth, and, therefore, are merely the surface expressions of the three concealed batholiths. Although the exposures of the individual granitic bodies in the Kodaikanal-Coimbatore region are elongated in an east-west direction, it is surmised, from structural evidences, that the main batholith is elongated in a roughly NNW-SSE direction.
A striking correspondence between the isoseismals for the Coimbatore earthquake of February 8, 1900 and the gravity contours is noticed. It is suggested that the Coimbatore earthquake (and the reported seismicity near Kottayam and 'Palghat Gap') could be the result of some minor readjustments of the boundaries of the batholith along fault planes.