Abstract The Barreirinhas Basin, located in the central part of the Brazilian Equatorial Margin, was originated by Pangea breakup during Early Cretaceous time. The Romanche Fracture Zone played an essential role during the entire tectono-stratigraphic evolution of the Barreirinhas Basin. This fracture zone divided the basin in two sub-basins to the south and north with distinct structural style printed on the basin internal geometry. This study is aimed to investigate how the tectonic and sedimentary evolution in the onshore, shallow and deep-water Barreirinhas Basin, were influenced by the Romanche Fracture Zone. Eight 2D seismic sections, subjected to seismic attributes to enhance the seismic stratigraphic horizons and structural features, and supported by five well profiles, allowed analyzing the basin infill, major faults, and the spatial relationship with the fracture zone. The basin evolution and the tectono-stratigraphic architecture are marked by structures from rift to drift stages. The rift sequences are composed of four seismic units (U1-U4) delimited on top by the horizon R4. The sag and drift sequences are composed of six seismic units (U5-U10) delimited between horizons R4-R10. The structural architectures are dominated by transtensional regimes, such as negative flower faults, tilted blocks, and wipeout zones, whereas transpressional tectonics is also present by reverse faults and positive flowers, which are fingerprints of Romanche Fracture Zone. Especially in the southern sub-basin, the transform tectonic activity deformed the entire basin from Aptian to Holocene. These structures correspond to those in Africa conjugate basins, where recurrent dextral strike-slip plate motions caused transtensional and transpressional deformations in the sedimentary pile since separation of South America and Africa. Asymmetric basin architecture, intensity and asynchrony of tectonic regimes distinguish the Atlantic Equatorial basins.

中文翻译：

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Barreirinhas 盆地内部结构和巴西赤道边缘罗曼什断裂带变形运动的证据

摘要 Barreirinhas盆地位于巴西赤道边缘中部，起源于早白垩世Pangea解体。Romanche 断裂带在 Barreirinhas 盆地的整个构造地层演化过程中发挥了重要作用。该断裂带将盆地分为南北两个子盆地，盆地内部几何形状印有明显的构造风格。本研究旨在研究陆上、浅水和深水 Barreirinhas 盆地的构造和沉积演化如何受到罗曼什断裂带的影响。八个二维地震剖面，受地震属性影响以增强地震地层和结构特征，并由五个井剖面支撑，允许分析盆地填充物、主要断层、以及与断裂带的空间关系。盆地演化和构造地层结构以从裂谷到漂移阶段的构造为标志。裂谷序列由四个地震单元（U1-U4）组成，顶部由地平线 R4 界定。凹陷和漂移序列由划定在层位 R4-R10 之间的六个地震单元 (U5-U10) 组成。构造构造以负花断层、倾斜块体和覆灭带等横张构造为主，而逆断层和正花也存在逆压构造，这是罗曼什断裂带的指纹。特别是在南部亚盆地，转换构造活动使整个盆地从阿普蒂安到全新世发生变形。这些结构对应于非洲共轭盆地的结构，自南美洲和非洲分离以来，反复发生的右旋走滑板块运动导致沉积桩发生横张和横压变形。大西洋赤道盆地的不对称盆地结构、强度和不同步的构造制度区分了大西洋赤道盆地。