| Abstract Submission No. | ABS-4.1-0081 |
| Title of Abstract | Aeromagnetic characteristics of felsic and mafic-ultra mafic plutons and their structural features in Prakasam Igneous Province, Nellore schist belt, southeastern Indian Margin |
| Authors | Seshu D*, Satish Kumar K, Subramanyam, K S V, Pradeep Kumar, V, Satyanarayana, H V S, Prakash Kumar |
| Organisation | CSIR-National Geophysical Research Institute |
| Address | Uppal road Hyderabad, Telangana, India Pincode: 500007 E-mail: seshugeo.ngri@csir.res.in |
| Country | India |
| Presentation | Oral |
| Abstract | The Prakasam Igneous Province (PIP), located along the southeastern Indian margin within the Nellore schist belt (NSB), exhibits evidence of significant felsic-mafic magmatic activity. The PIP geological domain encompasses both felsic and mafic-ultramafic intrusive bodies as plutons, besides alkali plutons. The felsic magmatism contributes to hydrothermal mineralization, while the mafic and ultramafic magmatism hosts the base and precious metals. An attempt has been made to demonstrate how best the high-resolution aeromagnetic studies can be used in the interpretation of magnetic structural patterns and structural controls within the PIP. Notably, high aeromagnetic signatures (data source: https://geodataindia.gov.in) are observed along the Boggulakonda, Purimetla, Pasupugallu, Chimakurti, and Kanigiri plutons, whereas Ravipadu and Pedda Cherlo Palle plutons show moderate magnetic responses. These aeromagnetic anomalies effectively delineate the structural framework and lithological contacts of the studied plutons, which are in well agreement with the lithological units. First vertical derivative (FVD), Tilt derivative (TDR), and Amplitude of Analytic Signal (AAS) analysis identify magnetic linear/curvilinear structures trending in N-S, E-W, and NE-SW directions. In this study, most of the plutons exhibit linear magnetic characteristics, such as faults and shear zones, which impart elongation and alignment to the intrusive bodies and their magnetic mineral fabrics, whereas the Chimakurti pluton shows a distinctive circular anomaly pattern. The FVD enhanced shallow magnetic sources and revealed that felsic plutons produced negative values due to low magnetic susceptibility, while mafic plutons showed higher magnetic anomalies due to magnetite content in the rock. The TDR and AAS enhanced the source boundaries. The present study provides an insight into structural control and the mineral resource potential of mafic-ultramafic plutonic complexes. |
| Keywords | Prakasam Igneous Province, felsic-mafic-ultra mafic Plutons, Aeromagnetic anomalies, Magnetic source, Nellore schist belt (NSB). |