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<p>Tucano Norte Sub-Basin and Jatobá Basin in northeastern Brazil are critical areas for understanding intracontinental rifting and Precambrian shear zone reactivation during Gondwana’s breakup. The tectonic processes that shaped these basins are analyzed by integrating aeromagnetic, gravimetric, and seismic data—with emphasis on the Riacho Seco-Macururé Shear Zone and the counterclockwise rotation of the Sergipe microplate. Tilt Derivative maps reveal NE–SW lineaments that delineate the Riacho Seco-Macururé Shear Zone as a deep crustal discontinuity, marking the boundary between the Sergipano Belt and Pernambuco-Alagoas Terrane, while gravimetric inversions show Moho thinning (28–36&#xa0;km) beneath the Riacho Seco-Macururé Shear Zone, consistent with seismic crustal discontinuities. Furthermore, 2.5D gravity modeling delineates grabens and half-grabens in the Pernambuco-Alagoas Terrane,&#xa0;which formed during the microplate rotation by simple shear. This study involved integrating multiple aeromagnetic data projects across the study area. The consistency and reliability of the integrated dataset were validated using synthetic data simulations, which allowed for calibration of the suturing parameters and assessment of the processing workflow’s sensitivity to noise. Our results demonstrate that the Riacho Seco-Macururé Shear Zone acted as a crustal inflection between the Tucano Norte Sub-Basin and Jatobá Basin during the Late Jurassic–Early Cretaceous rifting. This study presents a model for deformations localization in aborted rifts, highlighting the role of Precambrian shear zones in rift evolution.</p>

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The tectonic basement in the inflection area between the Tucano Norte Sub-basin and Jatobá Basin (Northeastern Brazil) using aeromagnetic and gravimetric data

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Nicolas Rodrigues Hispagnol,
  • Juarez Lourenço,
  • Andrés Reinaldo Rodriguez Papa,
  • Tiago Rafael Gregory,
  • Byanca Cristiane Cristo Junior Cardoso

摘要

Tucano Norte Sub-Basin and Jatobá Basin in northeastern Brazil are critical areas for understanding intracontinental rifting and Precambrian shear zone reactivation during Gondwana’s breakup. The tectonic processes that shaped these basins are analyzed by integrating aeromagnetic, gravimetric, and seismic data—with emphasis on the Riacho Seco-Macururé Shear Zone and the counterclockwise rotation of the Sergipe microplate. Tilt Derivative maps reveal NE–SW lineaments that delineate the Riacho Seco-Macururé Shear Zone as a deep crustal discontinuity, marking the boundary between the Sergipano Belt and Pernambuco-Alagoas Terrane, while gravimetric inversions show Moho thinning (28–36 km) beneath the Riacho Seco-Macururé Shear Zone, consistent with seismic crustal discontinuities. Furthermore, 2.5D gravity modeling delineates grabens and half-grabens in the Pernambuco-Alagoas Terrane, which formed during the microplate rotation by simple shear. This study involved integrating multiple aeromagnetic data projects across the study area. The consistency and reliability of the integrated dataset were validated using synthetic data simulations, which allowed for calibration of the suturing parameters and assessment of the processing workflow’s sensitivity to noise. Our results demonstrate that the Riacho Seco-Macururé Shear Zone acted as a crustal inflection between the Tucano Norte Sub-Basin and Jatobá Basin during the Late Jurassic–Early Cretaceous rifting. This study presents a model for deformations localization in aborted rifts, highlighting the role of Precambrian shear zones in rift evolution.