Geophysical characterization and tectonic insights of the Western Meridional Borborema Province in the Northeastern Region of Brazil

The Western Meridional Borborema Province (MBP) and the northern part of the São Francisco Craton (SFC) experienced significant tectonic events during the Neoproterozoic era. However, their geological history remains incompletely understood due to the absence of comprehensive studies on the deep cru...

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Bibliographic Details
Published in:Earth sciences research journal 2024-09, Vol.28 (3), p.239
Main Authors: Oliveira, Vinicius, Alanna Costa Dutra, Onofre H. D. J. das Flores
Format: Article
Language:English
Subjects:
Cratons
Crustal structure
Crustal thickness
Geological history
Geology
History
Magnetic field
Magnetic fields
Tectonics
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Summary:The Western Meridional Borborema Province (MBP) and the northern part of the São Francisco Craton (SFC) experienced significant tectonic events during the Neoproterozoic era. However, their geological history remains incompletely understood due to the absence of comprehensive studies on the deep crustal structure situated in the Western MBP. This study aims to explore the boundaries of the crustal blocks between the western MBP and the northern SFC, with the objective of enhancing the understanding and contributing to the reconstruction of their geological history. To achieve the defined objectives, we utilized, gravimetric, magnetic, and elevation data. Lateral extensions were determined by anomalous magnetic field transformations, while source depths were calculated using the An-Euler method. The results revealed source depths between 1.0 km and above 5.0 km, with a structural index of 1.0 to 3.0, are observed in both the SFC and the Borborema cross-section, as well as west of the Sergipano Belt. These different structural indices represent magnetic source geometries, which can vary from a dyke, an intrusive body or a localized mineral concentration. These results were used as a priori information in the 3D forward modeling of the crust to obtain the density contrast distribution in the subsurface. The results indicate that the Riacho do Pontal Belt has a crustal thickness of 38.2 km, which is thinner compared to the values ranging from 41.6 km to the north of the SFC with values ranging from 41.6 km.
ISSN:1794-6190
2339-3459
DOI:10.15446/esrj.v28n3.113767