%0 Journal Article %T Re-assessment of the northern Guinean “Koubia–Lessere unconformity” (KLU): Consequences on the geological correlations throughout West Africa %+ Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) %+ Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) %+ Université Cheikh Anta Diop [Dakar, Sénégal] (UCAD) %A Villeneuve, Michel %A Theveniaut, Hervé %A Ndiaye, Papa Moussa %A Retière, Sylvain %< avec comité de lecture %J Comptes Rendus Géoscience %I Elsevier %V 346 %N 9-10 %P 262-272 %8 2014-09 %D 2014 %R 10.1016/j.crte.2014.05.004 %K Regional unconformity %K Neoproterozoic %K Palaeozoic %K Tillite %K Panafrican orogen %K Mauritanides and Rokelides belts %Z Sciences of the Universe [physics]/Earth SciencesJournal articles %X New radiometric data from recent cartographic projects (2007, 2010) lead to a reinterpretation of the "Koubia-Lessere Unconformity" (KLU). This unconformity is evidenced in the Bassaride Ranges (northern Guinea) and in two western inliers (Tomine and Kemberra). The KLU was previously correlated with the main unconformity (Jbeliat unconformity [JU]) separating the lower "super group 1" from the middle "super group 2" of the large Taoudeni basin. Consequently, the brecciated level (partly glaciogenic) that underlines the "KLU" was correlated with the "tillitic" level located at the base of the super group 2. The latter is linked to the worldwide "Marinhoan" glacial event (650-635 Ma). However, 32 recently published U/Pb age data on detrital or new formed zircons show clearly that the Bassarides groups (ante KLU), deformed and slightly metamorphosed by the Panafrican-II orogen, belong to the super group 2 of the Taoudeni basin. Consequently, the overlying "Koubia-Lessere unconformity" (KLU) cannot be linked to the "Jbeliats unconformity" (JU) that separates the super groups 1 and 2 in the Taoudeni basin. The KLU is younger than the Panafrican-II orogen and probably younger than the last volcanic basaltic flows (492 Ma) outcropping in the Bassaride belt. Consequently, the glaciogenic levels that outcrop in the KLU should be distinguished from the numerous "Marinhoan" glacial levels of West Africa. This new KLU interpretation implies some important changes in the stratigraphic correlations and interpretations all over the West African domain. %G English %L hal-01176469 %U https://brgm.hal.science/hal-01176469 %~ INSU %~ BRGM %~ CNRS %~ UNIV-AMU %~ CDF %~ INRA %~ CEREGE %~ OSU-INSTITUT-PYTHEAS %~ PSL %~ AGREENIUM %~ INRAE %~ CDF-PSL %~ INRAEPACA