Magnetic Anomalies and Basement Structure Around Vizianagaram,Visakhapatnam and Srikakulam Districts of Andhra Pradesh,India |
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| Institution: | 1. Department of Geophysics, Andhra University, Visakhapatnam — 530 003, India;1. Department of Geological Sciences, Jadavpur University, India;2. Department of Earth and Environmental Sciences, University of Rochester, United States;1. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. School of Earth, Atmosphere & Environment, Monash University, Melbourne, VIC 3800, Australia;3. Yunnan Institute of Geological Survey, Kunming 650216, China;4. John de Laeter Centre, Curtin University, Kent Street, Bentley, WA 6102, Australia;5. Chinese Academy of Geological Sciences, Beijing 100037, China;1. Geoscience Institute, Federal University of Bahia, Salvador, BA, Brazil;2. Geological Engineering, Center for Engineering, Federal University of Pelotas, Pelotas, RS, Brazil |
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| Abstract: | A systematic regional magnetic survey was carried out in the districts of Vizianagaram, Visakhapatnam and Srikakulam in Andhra pradesh, India comprising an area of 15, 000 sq. km of eastern migmatite zone of Eastern Ghat Mobile Belt. The magnetic anomalies are very noisy, varying between ?1300 nT and +700 nT in amplitude and correlate very poorly with the surface geology. Upward continuation of these anomalies brought out distinct magnetic anomaly trends, running along NE-SW on the south and turning later to E-W on the north, consistent with the folding pattern of Eastern Ghats. Based on the termination of anomaly closures and displacement of anomaly trends, five faults, all striking approximately in the N-S direction, were inferred. From inversion of anomaly profiles, it is established that the anomalies are produced by structures in the magnetic basement composed of charnockites. |
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