Abstract Existing models of tectonic evolution of the Neoproterozoic orogenic system rimming the shores of the South Atlantic Ocean (the Aracuai–Ribeira–Congo and Dom Feliciano–Kaoko–Gariep belts) interpret the belts as subduction-related orogens and emphasize the role of the “Adamastor Ocean” in their pre-collisional evolution. A critical problem in such an interpretation is the confined nature of the northern termination of the orogenic system, as well as a very short time span between the end of rifting and onset of convergence recognized in its southern part. In this contribution, we review the data for the pre- and synorogenic evolution of this system of orogens (here collectively called the South Atlantic Neoproterozoic Orogenic System) and show that the data speak against the presence of a large oceanic domain before the onset of its orogenic evolution. We propose a new and simple intracontinental model, suggesting that Neoproterozoic oceanic crust played only a minor role in the development of the South Atlantic Neoproterozoic Orogenic System and that its overall architecture and thermal evolution is the result of inversion of large-scale rift structures with a protracted, and probably episodic, extensional history. True oceanic crust probably developed only in the southern part of the rift system, but it must have been narrow, akin to the Red Sea–Gulf of Aden stage of the “Adamastor Rift” evolution just before the onset of convergent thickening.

中文翻译：

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Adamastor – 一个从未存在过的海洋？

摘要 围绕南大西洋沿岸的新元古代造山系统（Aracuai-Ribeira-Congo 和 Dom Feliciano-Kaoko-Gariep 带）的构造演化现有模型将这些带解释为与俯冲相关的造山带，并强调了“ Adamastor Ocean”在碰撞前的演化过程中。这种解释的一个关键问题是造山系统北端的受限性质，以及在其南部确认的裂谷结束和收敛开始之间的时间跨度非常短。在这个贡献中，我们回顾了这个造山带系统（这里统称为南大西洋新元古代造山系统）的前和同造造山带演化的数据，并表明这些数据反对在造山带演化开始之前存在大洋域。我们提出了一个新的、简单的陆内模型，表明新元古代洋壳在南大西洋新元古代造山系统的发展中只起次要作用，其整体结构和热演化是大规模裂谷结构反转的结果长期的，可能是偶发的，延伸的历史。真正的洋壳可能只在裂谷系统的南部发育，但它一定很窄，