Abstract Geological, U-Pb (detrital zircon), whole-rock Nd isotopes, and geophysical information constrain the timing, provenance, and depositional and tectonic settings of sedimentary successions from the Gurupi Belt (GB) and Sao Luis cratonic fragment (SLCF) in northern Brazil. The results, along with published information about the magmatic events are used to discuss the crustal framework and regional correlations. We defined the following stages of sedimentation related to the Rhyacian and Neoproterozoic-Early Cambrian evolution. (1) 2240-2160 Ma –metavolcano-sedimentary sequences formed in arc- (SLCF) and back-arc (GB) basins. (2) 2165-2120 Ma – two syn-orogenic, siliciclastic (turbidite) sequences; the oldest (>2149 Ma) formed in a forearc or intra-arc setting, the youngest (>2116 Ma) formed in forearc or distal intra-arc system. (3) 2120-2088 Ma – post-collisional, continental, siliciclastic basin(s) formed in fluviatile setting, and representing a foreland system, which was split into two sub-basins in more recent times. These Rhyacian sequences correlate with similar successions in the West-African and Amazonian cratons, and formed during the agglutination of a continental block in pre-Columbia times (>2000 Ma), which remained joined through the assembly (∼1800 Ma) and breakup (∼1300 Ma) of Columbia, being only fragmented during Rodinia breakup (∼750 Ma). This breakup produced, probably distal, intracontinental effects that led to the deposition of (4) 1130-740 Ma – siliciclastic sequences formed in rift and passive margin basins; no evidence of oceanization is observed, and the sequences correlate in time with sedimentary formations of the Rokelide Belt in West Africa. The closure of the epicontinental sea took place during intracontinental orogeny, which represents a distal effect of the collisional orogenies that assembly West-Gondwana at the Neoproterozoic-Early Cambrian boundary. The last sedimentation event comprises (5)

中文翻译：

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巴西北部古鲁皮带和圣路易斯克拉通碎片变沉积层序的年龄、来源和构造环境：拓宽对元古代-早寒武世构造演化的理解

摘要 地质、U-Pb（碎屑锆石）、全岩 Nd 同位素和地球物理信息限制了来自古鲁皮带（GB）和圣路易斯克拉通碎片（SLCF）的沉积序列的时间、来源、沉积和构造环境。巴西北部。结果，连同已发表的有关岩浆事件的信息，用于讨论地壳框架和区域相关性。我们定义了与 Rhyacian 和新元古代-早寒武世演化相关的以下沉积阶段。(1) 2240-2160 Ma——形成于弧-(SLCF)和弧后(GB)盆地的变质火山-沉积层序。(2) 2165-2120 Ma – 两个同造山、硅质碎屑（浊积岩）层序；最老的 (>2149 Ma) 形成于弧前或弧内环境，最年轻的 (>2116 Ma) 形成于弧前或弧内远端系统。(3) 2120-2088 Ma – 后碰撞、陆相、硅质碎屑盆地形成于河流环境中，代表前陆系统，最近分裂为两个子盆地。这些 Rhyacian 层序与西非和亚马逊克拉通的类似序列相关，并在前哥伦比亚时代（> 2000 Ma）在大陆块的凝集期间形成，通过组装（~1800 Ma）和破裂保持连接（约 1300 Ma），仅在 Rodinia 分裂（约 750 Ma）期间破碎。这种破裂产生了可能是远端的陆内效应，导致 (4) 1130-740 Ma – 在裂谷和被动边缘盆地中形成的硅质碎屑层序的沉积；没有观察到海洋化的证据，并且这些序列与西非罗克利德带的沉积地层在时间上相关。陆上海的闭合发生在陆内造山运动期间，这代表了在新元古代-早寒武世边界组装西冈瓦纳大陆的碰撞造山运动的远端效应。最后一次沉积事件包括 (5)