Journal
TECTONOPHYSICS
Volume 477, Issue 3-4, Pages 145-159Publisher
ELSEVIER
DOI: 10.1016/j.tecto.2009.02.010
Keywords
Paleoproterozoic; Birimian; Weak orogeny; Homogeneous strain; Domes and basins; West African Craton; Ivory Coast
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Funding
- Direction de la Geologie of the Ivory Coast government
- French Cooperation and Help program
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The Paleoproterozoic domain of the Ivory Coast lies in the central part of the West African Craton (WAC) and is mainly constituted by TTG, greenstones, supracrustal rocks and leucogranites. A compilation of metamorphic and radiometric data highlights that: i) metamorphic conditions are rather homogeneous through the domain, without important metamorphic jumps, ii) HP-LT assemblages are absent and iii) important volumes of magmas emplaced during the overall Paleoproterozoic orogeny suggesting the occurrence of long-lived rather hot geotherms. Results of the structural analysis, focused on three areas within the Ivory Coast, suggest that the deformation is homogeneous and distributed through the Paleoproterozoic domain. In details, results of this study point out the long-lived character of vertical movements during the Eburnean orogeny with a two folds evolution. The first stage is characterized by the development of domes and basins geometries without any boundary tectonic forces and the second stage is marked by coeval diapiric movements and horizontal regional-scale shortening. These features suggest that the crust is affected by vertical movements during the overall orogeny. The Eburnean orogen can then be considered as an example of long-lived Paleoproterozoic weak type orogen. (C) 2009 Elsevier B.V. All rights reserved.
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