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

D. Atchuta Rao ¹, H. V. Ram Babu ¹, Ch. Rama Rao ¹

Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN

Abstract

The discovery of a hemispherical shaped Maha Stupa, the largest known in South India belonging to the 2nd to 6th century A.D., Buddhist monastic order at Nelakondapally (Khammam district, Andhra Pradesh), has marked the area for further exploration for cultural sites and objects. The Department of Archaeology and Museums, Government of A.P., has been actively pursuing exploration in this area using conventional methods and brought to light some important archaeological findings indicating the importance of the area for elucidating the full structural details of the dwelling complexes and other cultural objects. With a view towards creating awareness among the archaeologists on the use of geophysics in archaeology, an experimental geophysical survey has been carried out using magnetic, electrical and electromagnetic methods, in an area near Nelakondapally. These surveys have brought out geophysical anomalies resulting in the discovery of sites and objects of archaeological interest. This paper describes the survey and the results which led to the discoveries.

Keywords

Geoarchaeology, Geophysical Surveys, Nelakondapally. Andhra Pradesh.

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M. Prasanthi Lakshmi ¹, H. V. Ram Babu ¹

Affiliations
1 National Geophysical Research Institute, Hyderabad-500007, IN

Abstract

The Bouguer gravity anomaly over the Godavan Basin shows a low (of about 50 mGal) within which a localized high of about 30 mGal occurs near Chinnur. This high is also associated with a well-Defined aeromagnetic anomaly of about 300 nT, observed at a height of about 1500 m above mean sea-Level. Interpretation of both gravity and magnetic anomalies reveals the presence of a mafic intrusive at depth that might be responsible for basement uplift in this region. The inferred intrusive supports the presence of volcanic activity associated with the tectonics of the Godavari rift.

Keywords

Chinnur High, Godavari Rift, Rift Related Magmatism, Gravity and Magnetic Modelling.

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H. V. Ram Babu ¹, M. Prasanti Lakshmi ¹

Affiliations
1 National Geophysical Research Institute, Hyderabad - 500 007, IN

Abstract

Regional gravity and aeromagnetic data over the Godavari basin and the adjoining region show distinct signatures of granulite terranes of Karimnagar and Bhopalpatnam areas. The Karimnagar Granulite Terrane (KGT) showing up as a thin (about 10-15 km wide) North-South belt near Khammam, widens to about 100 km near Warangal and extends through Karimnagar, Adilabad and beyond up to Wardha in a NW-SE direction, parallel to the Godavari basin. The Bhopalpatnam Granulite Terrane (BGT) appears as a 10 km wide linear belt on the eastern side of the basin. The Eastern Ghat Granulite Terrane (EGT), which occupies a vast area along the east coast of India, also possesses similar characteristic features within the study area. About 15 krn east of Hyderabad, a North-South linear belt showing characteristic signatures of granulites could be identified from the aeromagnetic image. This belt, named as the Hyderabad Granulite Terrane (HGT) is about 25 km wide and joins the KGT near Karimnagar. These granulite terranes show higher values of magnetic susceptibility and density (except that of HGT).

Keywords

Aeromagnetics, Granulite Terrane, Karimnagar, Bhopalpatnam, Hyderabad, Godavari Basin, Andhra Pradesh.

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S. Viswanathan ¹, H. V. Ram Babu ², Prasanti Lakshmi ²

Affiliations
1 10, Bapuji Apartments, Dombivili (East), Mumbai - 421 201, IN
2 National Geophysical Research Institute, Hyderabad, IN

Abstract

No Abstract.

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