The sedimentary units of the geographically isolated basins of NE Brazil are historically interpreted as coeval and part of the same depositional system that was ultimately responsible to the deposition of the first sedimentary sequence of the intracratonic Parnaíba Basin. We present the first integrated detrital zircon U-Pb age dataset from the Early Paleozoic basins of NE Brazil, providing new insights into the depositional evolution and erosional history after Western Gondwana assembly. The lowermost sedimentary units (Ipu, Cariri, and Tacaratu formations) of eleven NE Brazil sedimentary basins (Parnaíba, Araripe, Tucano-Jatobá, Lavras da Mangabeira, Fátima, São José do Belmonte, and Mirandiba) were analyzed by a multi-proxy approach aiming to propose new insights on the paleogeographic reconstruction and stratigraphic correlations. Sedimentary provenance data, together with paleocurrents measurements consistently towards NNW-NW, suggests that the primary source for all the Early Paleozoic sedimentary units of NE Brazil were elevated orogenic areas related to the Brasiliano Orogeny to the south of Borborema Province (e.g., Riacho do Ponta, Rio Preto, and Sergipano belts). Based on detrital zircon U-Pb ages, we position the beginning of sedimentation of these basins in the Ordovician. The U-Pb age spectra for all analyzed sedimentary successions are remarkably similar. The analysis of KDE plots, CA-DA gap curves, and (dis)similarity tests, reinforced the correlation and contemporaneity of all the Ordovician sedimentary successions of NE Brazil. The conceived paleogeography model points to deposition of all the analyzed successions in a ramp, slightly tilted towards NW, where continental-scale fluvial system drained Neoproterozoic orogenic areas (i.e., Brasiliano Orogeny) dispersing huge volumes of sediments towards Borborema Province interior.

中文翻译：

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巴西东北部早古生代沉积记录：揭示西冈瓦纳组装后河流系统的沉积物源和演化

巴西东北部地理上孤立的盆地的沉积单元在历史上被解释为同时代的和同一沉积系统的一部分，该系统最终导致了克拉通内帕纳伊巴盆地第一沉积层序的沉积。我们提出了来自巴西东北部早古生代盆地的第一个综合碎屑锆石 U-Pb 年龄数据集，为西冈瓦纳组装后的沉积演化和侵蚀历史提供了新的见解。通过多代理方法对巴西东北部 11 个沉积盆地（Parnaíba、Araripe、Tucano-Jatobá、Lavras da Mangabeira、Fátima、São José do Belmonte 和 Mirandiba）的最低沉积单元（Ipu、Cariri 和 Tacaratu 地层）进行了分析旨在对古地理重建和地层对比提出新的见解。沉积物源数据以及一致朝向 NNW-NW 的古水流测量表明，巴西东北部所有早古生代沉积单元的主要来源是与 Borborema 省南部的巴西利亚诺造山运动相关的高位造山地区（例如，Riacho do Ponta） 、里约普雷图和塞尔吉帕诺带）。根据碎屑锆石U-Pb年龄，我们将这些盆地的沉积起始时间定位在奥陶纪。所有分析的沉积层序的 U-Pb 年龄谱都非常相似。 KDE 图、CA-DA 间隙曲线和（异）相似性检验的分析强化了巴西东北部所有奥陶纪沉积序列的相关性和同时性。设想的古地理模型表明，所有分析的序列都沉积在一个稍微向西北倾斜的斜坡上，其中大陆规模的河流系统排出了新元古代造山带（即巴西利亚诺造山运动），将大量沉积物分散到博尔博雷马省内部。