Abstract The period between the Rhyacian and Orosirian is known for the development of many orogenic belts and supracrustal sequences, which can be found in different cratons worldwide. In the northern part of the Sao Francisco Craton, there occur several Rhyacian-Orosirian sedimentary sequences associated with the orogenies that amalgamated the precursors of the Sao Francisco and West-Congo Cratons. However, little is known about the time and tectonic setting of sediment deposition. In this study we present U-Pb detrital zircon ages and provenance studies of sedimentary successions from the Paleoproterozoic Rio Capim greenstone belt, Serrinha Block, Sao Francisco Craton, Brazil. Detrital zircon data reveal a main sedimentary source of ages between 2.20 and 2.12 Ga, and indicate protoliths deposition between 2106 and 2086 Ma in a pro-foreland type basin. The main age interval matches the arc-related magmatism of the Rio Capim and Rio Itapicuru greenstone belts. Additionally, an age interval of 2.35-2.25 Ga indicates a sedimentary contribution of unknown source, while ages between 2.8-3.2 Ga suggest the Archean basement source. Field features, U-Pb ages and major and trace elements data support the interpretation that the Rio Capim and Rio Itapicuru greenstone belt both could make up an arc complex. Lithostratigraphic and tectonic matches allow to suggesting that the Serrinha Block may have an African counterpart, namely the Ntem-Chaillu Block, West-Congo Craton.

中文翻译：

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东北圣弗朗西斯科克拉通和西刚果克拉通在 Rhyacian (2.10-2.04 Ga) 造山运动之前相连：来自 Rio Capim 绿岩带、Serrinha Block 的上地壳岩石的来源和 U-Pb 年龄的证据

摘要 Rhyacian和Orosirian之间的时期以许多造山带和上地壳层序的发育而闻名，这些造山带和上地壳层序可以在世界各地的不同克拉通中找到。在圣弗朗西斯科克拉通的北部，出现了几个与圣弗朗西斯科克拉通和西刚果克拉通的前身合并的造山运动相关的里亚克-奥罗斯纪沉积层序。然而，人们对沉积物沉积的时间和构造环境知之甚少。在这项研究中，我们介绍了巴西圣弗朗西斯科克拉通 Serrinha 区块古元古代 Rio Capim 绿岩带沉积序列的 U-Pb 碎屑锆石年龄和物源研究。碎屑锆石数据揭示了年龄在 2.20 至 2.12 Ga 之间的主要沉积源，并表明前陆型盆地中 2106 至 2086 Ma 之间的原岩沉积。主要年龄区间与 Rio Capim 和 Rio Itapicuru 绿岩带的弧相关岩浆作用相匹配。此外，2.35-2.25 Ga 的年龄区间表明存在未知来源的沉积贡献，而 2.8-3.2 Ga 之间的年龄表明太古代基底源。野外特征、U-Pb 年龄以及主要和微量元素数据支持了 Rio Capim 和 Rio Itapicuru 绿岩带都可以构成弧复合体的解释。岩石地层和构造匹配允许暗示 Serrinha 地块可能有一个非洲对应物，即西刚果克拉通的 Ntem-Chaillu 地块。2.35-2.25 Ga的年龄区间表明来源不明的沉积贡献，而2.8-3.2 Ga之间的年龄表明太古代基底源。野外特征、U-Pb 年龄以及主要和微量元素数据支持了 Rio Capim 和 Rio Itapicuru 绿岩带都可以构成弧复合的解释。岩石地层和构造匹配允许暗示 Serrinha 地块可能有一个非洲对应物，即西刚果克拉通的 Ntem-Chaillu 地块。2.35-2.25 Ga的年龄区间表明来源不明的沉积贡献，而2.8-3.2 Ga之间的年龄表明太古代基底源。野外特征、U-Pb 年龄以及主要和微量元素数据支持了 Rio Capim 和 Rio Itapicuru 绿岩带都可以构成弧复合体的解释。岩石地层和构造匹配允许暗示 Serrinha 地块可能有一个非洲对应物，即西刚果克拉通的 Ntem-Chaillu 地块。