Cuddapah Basin Configuration - Another Account Based on Gravity and Aeromagnetics

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Abstract
The gravity and aeromagnetic maps of the Cuddapah basin present some very interesting results that may help in understanding the configuration of the basin better and also plan exploration strategies. Based on the gravity field along 79"E longitude, the Nallamalai sub-basin can be divided into three minor basins separated by two ridges along Obalam-Vanipenta and Racherla-Nandikotkur axis, besides the Palnad basin at the northeastern end which also might be underlain by Nallamalais. The aeromagnetic picture divides the basin and adjoining crystallines on the east into two domains roughly along a line joining Srisailam and Srikalshasti. To the east of this magnetic divide, the dense high frequency contours inside the basin, like those on the outside, suggest a shallow basement for the Nallamalais. To the west of it, it is the low frequency E-W regional trends that dominate. The corresponding magnetic profile (along 79°E) brings out a major E-W regional magnetic high with a width of about 10km at its peak; along Pedda Ahobilam-Panem axis. While this high falls off regionally both towards south and north, the northern fall is interrupted by two low closures, one west of Racherla and the other corresponding to the Srisailam basin. The Macherla-Agnigundala gravity ridge and the associated dipolar magnetic anomaly could be due to sources responsible for mineralisation near Agnigundala and as such the entire ridge trending NW-SE needs a closer geological scrutiny.

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