The interplay between basement fabric, rifting, syn-rift folding, and inversion in the Rio do Peixe Basin, NE Brazil,Basin Research

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The interplay between basement fabric, rifting, syn-rift folding, and inversion in the Rio do Peixe Basin, NE Brazil
Basin Research ( IF 2.8 ) Pub Date : 2022-08-29 , DOI: 10.1111/bre.12704
Leonardo M. Pichel ₁ , Alex F. Antunes ₂ , Haakon Fossen ₁ , Barbara F. Rapozo ₂ , Emma Finch ₃ , Valeria C. Córdoba ₂

Affiliation

The Rio do Peixe Basin is part of a series of aborted Cretaceous rifts formed within the Proterozoic Borborema Province, onshore NE Brazil in response to rifting between Africa and South America. The basin is remarkably well-imaged and comprises fault-bounded depocentres, the main ones being the NE-oriented Brejo das Freiras and the E–W-oriented Sousa half-grabens. These grabens and their bounding faults are influenced by Neoproterozoic basement shear zones and present a complex framework of secondary normal faults and folds. Recent workers also interpret large reverse faults and regional post-rift shortening driven by far-field stresses from the Andes. For those reasons, the basin represents an ideal setting to investigate the multiphase history of rift basins. We thus combine borehole-calibrated 2D and 3D seismic and magnetic data with section restoration and numerical modelling to investigate the architecture and evolution of this basin. We aim to understand: (i) the controls of the basement fabric in 3D fault architecture and kinematics and (ii) how syn-rift faults controlled the geometry and development of fault-related folds. By doing this, we also investigate the timing, kinematics, and magnitude of inversion in the basin to explore its multiphase history. We demonstrate that (i) the basement fabric controlled not only the strike of faults but also their geometry and polarity at depth, (ii) folds in the syn-rift sequence are attributed simply to syn-rift extension along stepped and/or curved faults, and (iii) inverted and/or reverse faults occur within the basin, but these are minor and appear to have formed during rifting. We explain this minor inversion by a change in plate kinematics related to the onset of the nearby transform margin to the north. These results have implications for understanding the 3D evolution of oblique grabens, the role of structural inheritance, and the recognition of inversion- versus extension-related folds in rift basins worldwide.

中文翻译：

巴西东北部 Rio do Peixe 盆地基底构造、裂谷、同裂谷褶皱和反转之间的相互作用

Rio do Peixe 盆地是元古代 Borborema 省内形成的一系列流产白垩纪裂谷的一部分，位于巴西东北部海岸，是非洲和南美洲之间裂谷作用的结果。该盆地的图像非常清晰，包括以断层为界的沉积中心，主要是东北向的 Brejo das Freiras 和东西向的 Sousa half-grabens。这些地堑及其边界断层受新元古代基底剪切带的影响，呈现出由次级正断层和褶皱构成的复杂格架。最近的工作人员还解释了由安第斯山脉的远场应力驱动的大型逆向断层和区域后裂谷缩短。由于这些原因，该盆地代表了研究裂谷盆地多相历史的理想环境。因此，我们将钻孔校准的 2D 和 3D 地震和磁力数据与剖面恢复和数值模拟相结合，以研究该盆地的构造和演化。我们的目标是了解：(i) 基底结构在 3D 断层结构和运动学中的控制，以及 (ii) 同裂谷断层如何控制断层相关褶皱的几何形状和发展。通过这样做，我们还研究了盆地内反转的时间、运动学和强度，以探索其多相历史。我们证明 (i) 基底结构不仅控制断层的走向，还控制它们在深度的几何形状和极性，(ii) 同裂谷序列中的褶皱仅归因于同裂谷沿阶梯状和/或弯曲断层的延伸，以及（iii）盆地内发生倒置和/或反向断层，但这些都是次要的，似乎是在裂谷期间形成的。我们通过与附近向北转换边缘的开始相关的板块运动学变化来解释这种微小的反转。这些结果对于理解斜地堑的 3D 演化、结构继承的作用以及识别全世界裂谷盆地中与反转和伸展相关的褶皱具有重要意义。

更新日期：2022-08-29

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