Antonio P. Y. J. auteur aut IRD Baratoux Lenka auteur aut IRD Trindade R. I. F. auteur aut IRD Rousse Sonia auteur aut IRD Ayite A. auteur aut IRD Lana C. auteur aut IRD Macouin M. auteur aut IRD Adu E. W. K. auteur aut IRD Sanchez C. auteur aut IRD Silva M. A. L. auteur aut IRD Firmin A. S. auteur aut IRD Dopico C. I. M. auteur aut IRD Proietti A. auteur aut IRD Amponsah P. O. auteur aut IRD Sakyi P. A. auteur aut IRD text journalArticle eng text/pdf born digital access The paleogeography of the Meso-Neoproterozoic Rodinia supercontinent remains debated partly because many stable cratons still lack reliable paleomagnetic data for this period. A new geochronological and paleomagnetic study was conducted on the NNW-trending Manso dyke swarm of southern West Africa (Ghana) to clarify the position of this unconstrained continent in Rodinia. Two U\\Pb apatite ages of 857.2 +/- 8.5 Ma and 855 +/- 16 Ma agree with one previous baddeleyite age, indicating a -860 Ma emplacement age for the Manso dykes. A characteristic remanent magnetization (ChRM) was isolated in stable single to pseudo-single domain (SD-PSD) magnetite. Well constrained site mean directions obtained for 13 dykes lead to a mean direction for the Manso dyke swarm of Dm = 181.9 degrees, Im = -77.2 degrees (N = 13, alpha 95 = 7.6 degrees, k = 30.6), yielding a paleomagnetic pole at 177.6 degrees E, 28.3 degrees S, (A95 = 12.7 degrees K = 11.6). Two directional clusters of opposite inclination passa reversal test (C-class) and the primary origin is supported by a positive baked contact test, satisfying all the seven R-criteria to provide the first West African Tonian key paleomagnetic pole. This key pole indicates a high latitude for the West Africa Craton during the emplacement of the-860 Manso dykes. A compilation of reliable paleomag-netic poles for West Africa, Baltica, Amazonia and Congo-S & atilde;o Francisco cratons suggests that these cratons were together between-1200 and 800 Ma in a long-lived WABAMGO configuration. We suggest that the collision of this block with Laurentia along the Grenvillian-Sunsas orogens closed the external Nuna Ocean and formed Rodinia by extroversion. specialized West Africa Neoproterozoic Tonian Rodinia Paleomagnetism GHANA 064 066 94 28-43 [+ corrigendum, 2021, vol. 95, 10-13] 2021 1342-937X https://www.documentation.ird.fr/hor/fdi:010081291 10.1016/j.gr.2021.02.010 1342-937X [F B010081291] https://www.documentation.ird.fr/hor/fdi:010081291 https://www.documentation.ird.fr/intranet/publi/2021-05/010081291.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2021-05-17 2025-02-24 fdi:010081291 fre