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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Adamastor - an ocean that never existed?

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Author(s):
Konopasek, Jiri [1, 2] ; Cavalcante, Carolina [2, 3] ; Fossen, Haakon [4] ; Janousek, Vojtech [1]
Total Authors: 4
Affiliation:
[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
Total Affiliations: 4
Document type: Review article
Source: EARTH-SCIENCE REVIEWS; v. 205, JUN 2020.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 10/03537-7 - Tectonoseismic Study of the Carlos Chagas Leucogranite and Adjacent Units, Araçuaí Belt (Eastern Brazil).
Grantee:Geane Carolina Gonçalves Cavalcante
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 14/10146-5 - Rheological evolution of the continental crust: microstructures and deformation mechanisms in the Além-Paraíba-Pádua shear zone (Ribeira Belt)
Grantee:Geane Carolina Gonçalves Cavalcante
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 13/19061-0 - Rheological evolution of the continental crust: microstructures and deformation mechanisms in the Além Paraíba-Pádua shear zone (Araçuaí-Ribeira belt)
Grantee:Geane Carolina Gonçalves Cavalcante
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 15/23572-5 - From orogeny to rifting and drifting: a study of the Eastern Brazilian orogenic belt and comparison with the North Atlantic Scandinavian orogenic belts/continental margins
Grantee:Renato Paes de Almeida
Support Opportunities: Research Grants - Visiting Researcher Grant - International