Review of the orogenic belts on the western side of the West African craton: the Bassarides, Rokelides and Mauritanides

2008 ◽  
Vol 297 (1) ◽  
pp. 169-201 ◽  
Author(s):  
Michel Villeneuve
Keyword(s):  
West African ◽  
The West ◽  
West African Craton ◽  
Western Side ◽  
Orogenic Belts

Where are the Eburnian–Transamazonian collisional belts?

1990 ◽  
Vol 27 (10) ◽  
pp. 1382-1393 ◽  
Author(s):  
Jean Michel Bertrand ◽  
Emmanuel Ferraz Jardim de Sá
Keyword(s):  
West African ◽  
High Grade ◽  
The West ◽  
West African Craton ◽  
Early Proterozoic ◽  
Late Proterozoic ◽  
Nappe Tectonics ◽  
Pan African ◽  
Orogenic Belts ◽  
Lower Crustal

The reconstruction of Early Proterozoic crustal evolution and geodynamic environments, in Africa and South America, is incomplete if cratonic areas alone are studied. If the presence of high-grade gneisses is considered as a first clue to past collisional behaviour, 2 Ga high-grade gneisses are more abundant within the Pan-African–Brasiliano mobile belts than in the intervening pre-Late Proterozoic cratons. The West African craton and the Guiana–Amazonia craton consist of relatively small Archaean nuclei and widespread low- to medium-grade volcanic and volcanoclastic formations intruded by Early Proterozoic granites. By contrast, 2 Ga granulitic assemblages and (or) nappes and syntectonic granites are known in several areas within the Pan-African–Brasiliano belts of Hoggar–Iforas–Air, Nigeria, Cameroon, and northeast Brazil. Nappe tectonics have been also described in the Congo–Chaillu craton, and Early Proterozoic reworking of older granulites may have occurred in the São Francisco craton. The location of the Pan-African–Brasiliano orogenic belts is probably controlled by preexisting major structures inherited from the Early Proterozoic. High-grade, lower crustal assemblages 2 Ga old have been uplifted or overthrust and now form polycyclic domains in these younger orogenic belts, though rarely in the cratons themselves. The Congo–Chaillu and perhaps the São Francisco craton are exceptional in showing controversial evidence of collisional Eburnian–Transamazonian assemblages undisturbed during Late Proterozoic time.

Structure, evolution and palaeogeography of the West African craton and bordering belts during the Neoproterozoic

1994 ◽  
Vol 69 (1-4) ◽  
pp. 307-326 ◽  
Author(s):  
M. Villeneuve ◽  
J.J. Cornée
Keyword(s):  
West African ◽  
Structure Evolution ◽  
The West ◽  
West African Craton

The magmatic evolution at the Moroccan outboard of the West African craton between the Late Neoproterozoic and the Early Palaeozoic

2008 ◽  
Vol 297 (1) ◽  
pp. 329-343 ◽  
Author(s):  
H. Ezzouhairi ◽  
M. L. Ribeiro ◽  
N. Ait Ayad ◽  
M. E. Moreira ◽  
A. Charif ◽  
...  
Keyword(s):  
West African ◽  
Magmatic Evolution ◽  
The West ◽  
West African Craton ◽  
Late Neoproterozoic ◽  
Early Palaeozoic

Paleomagnetism of the ~860 Ma Manso dyke swarm, West Africa: implications for the assembly of Rodinia

2021 ◽  
Author(s):  
Paul Yves Jean Antonio ◽  
Lenka Baratoux ◽  
Ricardo Ivan Ferreira Trindade ◽  
Sonia Rousse ◽  
Anani Ayite ◽  
...  
Keyword(s):  
West Africa ◽  
West African ◽  
Dyke Swarm ◽  
Jigsaw Puzzle ◽  
The West ◽  
West African Craton ◽  
Contact Test ◽  
Fine Grained ◽  
Paleomagnetic Pole ◽  
Coarse To Fine

<p>The West African Craton (WAC) is one of the major cratons in the Rodinia jigsaw puzzle (~1000–750 Ma). In the Rodinian models, the position of West Africa is mainly constrained by the assumption that it had been a partner of Amazonia since the Paleoproterozoic. Unfortunately, no paleomagnetic data are available for these cratons when the Rodina supercontinent is considered tectonically stable (~1000-750 Ma). Thus, every new reliable paleomagnetic pole for the West African Craton during the Neoproterozoic times is of paramount importance to constrain its position and testing the Rodinia models. In this study we present a combined paleomagnetic and geochronological investigation for the Manso dyke swarm in the Leo-Man Shield, southern West Africa (Ghana). The ~860 Ma emplacement age for the NNW-trending Manso dykes is thus well-constrained by two new U-Pb apatite ages of 857.2 ± 8.5 Ma and 855 ± 16 Ma, in agreement with baddeleyite data. Remanence of these coarse-to-fine grained dolerite dykes is carried by stable single to pseudo-single domain (SD-PSD) magnetite. A positive baked-contact test, associated to a positive reversal test (Class-C), support the primary remanence obtained for these dykes (13 sites). Moreover, our new paleomagnetic dataset satisfy all the seven R-criteria (R=7). The ~860 Ma Manso pole can thus be considered as the first key Tonian paleomagnetic pole for West Africa. We propose that the West Africa-Baltica-Amazonia-Congo-São Francisco were associated in a long-lived WABAMGO juxtaposition (~1100–800 Ma).</p><p><strong>Keywords:</strong> West Africa, Neoproterozoic, Tonian, Rodinia, paleomagnetism.</p><p> </p>

Preserved ancient oceanic lithosphere within the Buem structural unit at the eastern margin of the west African craton

Lithos ◽  
2022 ◽  
pp. 106585
Author(s):  
Daniel Kwayisi ◽  
Marlina Elburg ◽  
Jeremie Lehmann
Keyword(s):  
Structural Unit ◽  
Oceanic Lithosphere ◽  
West African ◽  
The West ◽  
West African Craton ◽  
Eastern Margin

Neoproterozoic granitoids associated with the Bou-Azzer ophiolitic melange (Anti-Atlas, Morocco): evidence of adakitic magmatism in an arc segment at the NW edge of the West-African craton

2004 ◽  
Vol 39 (3-5) ◽  
pp. 285-293 ◽  
Author(s):  
E.H. Beraaouz ◽  
M. Ikenne ◽  
A. Mortaji ◽  
A. Madi ◽  
M. Lahmam ◽  
...  
Keyword(s):  
West African ◽  
The West ◽  
West African Craton ◽  
Ophiolitic Mélange

Early Neoproterozoic rift-related magmatism in the Anti-Atlas margin of the West African craton, Morocco

2014 ◽  
Vol 255 ◽  
pp. 433-442 ◽  
Author(s):  
J. Javier Álvaro ◽  
André Pouclet ◽  
Hassan Ezzouhairi ◽  
Abderrahmane Soulaimani ◽  
El Hafid Bouougri ◽  
...  
Keyword(s):  
West African ◽  
The West ◽  
West African Craton ◽  
Early Neoproterozoic

scholarly journals Supplemental Material: Reorienting the West African craton in Paleoproterozoic–Mesoproterozoic supercontinent Nuna

2021 ◽  
Author(s):  
Zheng Gong ◽  
et al.
Keyword(s):  
West African ◽  
The West ◽  
West African Craton

Detailed geochronological, paleomagnetic, and rock magnetic results.

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