Processamento magnetométrico de uma anomalia dipolar na bacia sedimentar de Taubaté-SP: uma abordagem geofísica através de inversão 2D

Abstract

This work aims to perform the magnetic inversion of a reversed dipole magnetic anomaly located in the Taubaté Basin, São Paulo. The Taubaté Basin is a Cenozoic sedimentary basin that is part of the Southeastern Brazilian Rift System, characterized by its complex tectonic and sedimentary history. This basin comprises a sequence of clastic sediments, with significant magnetic events that may be associated with alkaline and volcanic bodies. For the geophysical and photointerpretation investigation, the software Oasis Montaj (version 5.1.8) from the Geosoft system, marketed by Seequent, and QGIS 3.34.5 were used. This study focuses on the investigation of a positive magnetic anomaly in the central portion of the Taubaté Basin, aiming to understand its magnetic signature through the processing of aeromagnetic data, as well as the generation of products and maps that support the interpretation of variations in the Earth's magnetic field and the adjacent geology. The following maps were generated: Anomalous Magnetic Field (CMA), Analytic Signal Amplitude (ASA), Reduction to the Pole (RTP), Total Horizontal Gradient Anomaly (AGHT), and Analytic Signal Tilt Angle (ISA), using data processed by the Secretariat of Geology, Mining and Mineral Transformation of the Ministry of Mines and Energy, through the Geophysics Division – DIGEOF of the Geological Survey of Brazil – CPRM, under the “São José dos Campos-Resende Aerogeophysical Project,” carried out between October 19, 2010, and October 11, 2013. Subsequently, a 2D inversion will be performed over the anomaly in order to estimate the depth of the sources, body morphology, and magnetic susceptibility. The study of positive anomalies can significantly contribute to mineral exploration, geological mapping, and the assessment of natural resources. The ability to identify and interpret these anomalies enhances the effectiveness of prospecting campaigns and reduces the risks associated with geological exploration.