Adamastor - an ocean that never existed?

Autor(es)

Konopasek, Jiri ^{[1, 2]} ; Cavalcante, Carolina ^{[2, 3]} ; Fossen, Haakon ^[4] ; Janousek, Vojtech ^[1]

Afiliação do(s) autor(es)

^[1] Czech Geol Survey, Klarov 3, Prague 11821 1 - Czech Republic

^[2] UiT Arctic Univ Norway, Dept Geosci, Dramsveien 201, N-9037 Tromso - Norway

^[3] Univ Fed Parana, Dept Geol, Ctr Politecn, Ave Cel Francisco Heraclito dos Santos 100, BR-81531980 Curitiba, PR - Brazil

^[4] Univ Bergen, Museum Nat Hist, Dept Earth Sci, Allegaten 41, N-5007 Bergen - Norway

• Tipo de documento: Artigo de Revisão
• Fonte: EARTH-SCIENCE REVIEWS; v. 205, JUN 2020.
• Citações Web of Science: 0

Resumo

Existing models of tectonic evolution of the Neoproterozoic orogenic system rimming the shores of the South Atlantic Ocean (the Aracual-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. (AU)

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