The total magnetic intensity anomaly (TMI) map of the Proterozoic intracratonic Cuddapah basin shows the presence of a prominent high–low–high anomaly of about 600 nT amplitude at its southern end. The source of this anomaly is inferred to be a mafic intrusive body due to a thermal plume that might have initiated the basin evolution. Though some quantitative studies have been carried out over this anomaly, the magnetic body remains ambiguous as only a part of this anomaly was modelled along the E–W direction. In present study, we model this anomaly by a 2.5D algorithm and analytical signal of the vertical integral (ASVI) of the TMI approach. A near circular outline of the causative body has been delineated by the analysis of ASVI, which also revealed three characteristic zones of the near surface irregularities. The 2.5D modelling along a SW–NE profile across the anomaly yielded the main body of about 10 km wide top at 3.5 km depth and 40 km wide at 25 km depth. The Curie temperature depth in this region is 30–40 km and this allows the source to be magnetic at this depth. It is inferred from both ASVI and modelling that the main body is bifurcated into two in its south-western part between Parnapalle and Muddanuru while it attains a lopolithic shape over the remaining part. Existing regional aeromagnetic data elucidates shape of the mafic intrusive both laterally and vertically.

古生代克拉通克拉达帕盆地的总磁强异常（TMI）图表明，在其南端存在着一个显着的高-低-高异常，振幅约为600 nT。由于可能导致盆地演化的热羽流，这种异常的来源被推断为镁铁质侵入体。尽管已经对该异常进行了一些定量研究，但磁体的模棱两可仍然是模棱两可的，因为该异常的仅一部分是沿E-W方向建模的。在本研究中，我们通过2.5D算法和TMI方法的垂直积分（ASVI）的分析信号对该异常进行建模。通过对ASVI的分析，勾画出致病体的近似圆形轮廓，该轮廓还揭示了近表面不规则性的三个特征区域。2。沿着整个异常的SW–NE剖面进行5D建模，可以得到3.5 km深度约10 km宽的顶部和25 km深度约40 km宽的主体。该区域的居里温度深度为30–40 km，这可使源在该深度处具有磁性。从ASVI和模型都可以推断出，该主体在Parnapalle和Muddanuru之间的西南部分被分成两部分，而在其余部分上则达到了整体形状。现有的区域航空磁数据从横向和垂直方向都阐明了铁镁质侵入体的形状。从ASVI和模型都可以推断出，该主体在Parnapalle和Muddanuru之间的西南部分被分成两部分，而在其余部分上则达到了整体形状。现有的区域航空磁数据从横向和垂直方向都阐明了铁镁质侵入体的形状。从ASVI和模型都可以推断出，主体在Parnapalle和Muddanuru之间的西南部分被分成两部分，而在其余部分上则达到了整体形状。现有的区域航空磁数据从横向和垂直方向都阐明了铁镁质侵入体的形状。