caa a22 4500 606150021 CHVBK 20210128100537.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00531-014-1138-y doi (NATIONALLICENCE)springer-10.1007/s00531-014-1138-y New investigations in southwestern Guinea: consequences for the Rokelide belt (West Africa) [Elektronische Daten] [Michel Villeneuve, Hervé Bellon, Michel Corsini, Joël Le Metour, Sébastien Chatelee] The southern Guinean terranes belong to the "Rokelide belt” that is located in the southwestern part of the West African craton (Senegal to Liberia). Field investigations and K-Ar and 40Ar-39Ar radiometric analysis performed on samples collected from southern Guinea provide a new interpretation for metamorphic terranes not yet dated. A K-Ar whole-rock age of a gneiss and 40Ar-39Ar plateau ages of amphiboles separated from a mylonitic gneiss of the Ouankifondi formation and a gneiss from the Kissi-Kissi formation yield several Pan-African metamorphic ages at circa 650, 560, and 530Ma, respectively. Field investigations show that these formations are unconformably capped by the Kolente group. The previous structural framework and the geodynamic evolution of the Rokelide belt based on the coeval evolution of the Ouankifondi and Kissi-Kissi formations and the Kolente group are reassessed. The Rokelide belt is linked to the Bassaride belt. Correlations with adjacent Sierra Leonean terranes and with northern Guinea and Senegal are considered. Springer-Verlag Berlin Heidelberg, 2015 Radiometric ages (K-Ar and 40Ar-39Ar) nationallicence Guinea nationallicence Rokelide belt nationallicence Bassaride belt nationallicence West Africa nationallicence Geodynamic models nationallicence Villeneuve Michel CEREGE, Université d'Aix-Marseille, case 67, 3, place Victor Hugo, 13331, Marseille, France aut Bellon Hervé UMR CNRS 6538, UBO, IUEM, Université européenne de Bretagne, Place Nicolas Copernic, 29280, Plouzané, France aut Corsini Michel Geoazur, Université de Nice-Sophia Antipolis, 250, rue A.Einstein, 06560, Valbonne, France aut Le Metour Joël BRGM, avenue Claude Guillemin, B.P. 6009, 45060, Orleans Cedex 2, France aut Chatelee Sébastien CEREGE, Université d'Aix-Marseille, case 67, 3, place Victor Hugo, 13331, Marseille, France aut International Journal of Earth Sciences Springer Berlin Heidelberg 104/5(2015-07-01), 1267-1275 1437-3254 104:5<1267 2015 104 531 https://doi.org/10.1007/s00531-014-1138-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00531-014-1138-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Villeneuve Michel CEREGE, Université d'Aix-Marseille, case 67, 3, place Victor Hugo, 13331, Marseille, France aut NATIONALLICENCE 700 1- Bellon Hervé UMR CNRS 6538, UBO, IUEM, Université européenne de Bretagne, Place Nicolas Copernic, 29280, Plouzané, France aut NATIONALLICENCE 700 1- Corsini Michel Geoazur, Université de Nice-Sophia Antipolis, 250, rue A.Einstein, 06560, Valbonne, France aut NATIONALLICENCE 700 1- Le Metour Joël BRGM, avenue Claude Guillemin, B.P. 6009, 45060, Orleans Cedex 2, France aut NATIONALLICENCE 700 1- Chatelee Sébastien CEREGE, Université d'Aix-Marseille, case 67, 3, place Victor Hugo, 13331, Marseille, France aut NATIONALLICENCE 773 0- International Journal of Earth Sciences Springer Berlin Heidelberg 104/5(2015-07-01), 1267-1275 1437-3254 104:5<1267 2015 104 531