Cuddapah Basin (CB) is an intracontinental, Proterozoic basin flanked by Eastern Dharwar Craton (EDC) in the west, Nellore Schist Belt (NSB) and Eastern Ghat Mobile Belt (EGMB) in the east, represents second largest Proterozoic basin of India. Gravity and magnetic surveys were carried out at the interface of Cuddapah Basin (CB) and Nellore Schist Belt (NSB) covering ~2880 km² area. Gravity map has brought out some distinct zones. The thrusted contact of NSB and Cuddapah sediments has been well delineated from the gravity map by NE–SW trending steep gradient of contours. Relatively high gravity values are observed over NSB in the southeastern part, moderately high values are observed over Cumbum Formation, but distinct low is observed over Baironkonda Formation. These gravity highs and lows are mainly the manifestation of basement characteristics and intrusives. The magnetic map shows two distinct domains, viz., moderate to low zone in the southern part, and moderate to high zone in the northern part. Regional gravity map suggests a change in basement characteristics from felsic to mafic from NW to SE. Presence of mafic basement may be representing EGMB group of rocks underneath the Cuddapah sediments at the eastern part of the study area. The joint gravity and magnetic modelling reveal varied nature of sedimentary units in terms of density and susceptibility and change in basement characteristic.

Cuddapah盆地（CB）是一个大陆内部的元古代盆地，其西部为东部的Dharwar Craton（EDC），东部的Nellore Schist带（NSB）和东部的Ghat Mobile Belt（EGMB），是印度的第二大元古代盆地。在Cuddapah盆地（CB）和Nellore Schist带（NSB）的界面上进行了重力和磁测，覆盖了约2880 km ²区。重力图带出了一些不同的区域。NE-SW趋势陡峭的轮廓线已从重力图上很好地描绘了NSB和Cuddapah沉积物的逆冲接触。在东南部的NSB上观测到相对较高的重力值，在Cumbum组上观测到中等较高的重力值，但在Baironkonda组的观测到明显较低的重力值。这些重力的高低主要是地下室特征和侵入体的表现。磁图显示了两个不同的区域，即南部的中低带和北部的中高带。区域重力图表明，从西北到东南，基底特征从长英质转变为黑镁质。镁铁质基底的存在可能代表了研究区域东部Cuddapah沉积物下方的EGMB岩石群。联合重力和磁学模型揭示了沉积单元在密度和磁化率以及基底特征变化方面的不同性质。