Apercu sur les formations precambriennes et paleozoiques du Senegal oriental

Bassot, Jean Pierre

doi:10.2113/gssgfbull.s7-xi.2.160

Cited by 22 publications

(9 citation statements)

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“…The Souroukoto and Sotuba Groups, and their counterpart the Segou and Madina-Kouta Groups in the Madina-Kouta Basin (Villeneuve, 1984(Villeneuve, , 1989, are made up of an alternation of continental to shallow marine sandstones, siltstones and shales recording several transgressive-regressive events. The following age data relate the lower part of this succession to the northern Char Group: 1058 Ma Rb-Sr on clays from the Segou Group (Bassot et al, 1963), 990 Ma K-Ar on glauconite (Bozhko et al, 1971) and 1060 Ma Rb-Sr on clays (Clauer, 1976) from the Sotuba Formation in the Mandingue Plateaux. Higher up, limestone beds with oncolites and poorly developed stromatolitic structures do exist, but no comparisons have been made with those from the northern Atar Group.…”

Section: The Southern Part Of the Taoudéni Basinmentioning

confidence: 95%

Pan-African tectonic evolution and glacial events registered in Neoproterozoic to Cambrian cratonic and foreland basins of West Africa

Deynoux

Affaton

Trompette³

et al. 2006

Journal of African Earth Sciences

137

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Section: The Southern Part Of the Taoudéni Basinmentioning

confidence: 95%

Pan-African tectonic evolution and glacial events registered in Neoproterozoic to Cambrian cratonic and foreland basins of West Africa

Deynoux

Affaton

Trompette³

et al. 2006

Journal of African Earth Sciences

137

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“…Lille (1967), Bassot et al (1963), and Bonhomme and Bertrand-Sarfati (1982) present a lot of results using both argon/potassium and strontium/rubidium method. Clauer et al (1982) dated the sediments using the Ar/K method and Dallmeyer and Villeneuve (1987), and Dallmeyer and Lécorché (1989) the metamorphic formation with the Ar/Ar method.…”

Section: Geophysical and Geochronological Datamentioning

confidence: 99%

Paleozoic basins in West Africa and the Mauritanide thrust belt

Villeneuve

2005

Journal of African Earth Sciences

104

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“…So, the first belt was linked to a ''Hercynian'' orogen and the second one to a ''Caledonian'' orogen. Bassot (1966Bassot ( , 1969 confirmed this interpretation in southeastern Senegal and northern Guinea.…”

Section: Geological Settingmentioning

confidence: 76%

Re-assessment of the northern Guinean “Koubia–Lessere unconformity” (KLU): Consequences on the geological correlations throughout West Africa

Villeneuve

Théveniaut

Ndiaye

et al. 2014

Comptes Rendus. Géoscience

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International audienceNew 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

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Apercu sur les formations precambriennes et paleozoiques du Senegal oriental

Cited by 22 publications

References 0 publications

Pan-African tectonic evolution and glacial events registered in Neoproterozoic to Cambrian cratonic and foreland basins of West Africa

Pan-African tectonic evolution and glacial events registered in Neoproterozoic to Cambrian cratonic and foreland basins of West Africa

Paleozoic basins in West Africa and the Mauritanide thrust belt

Re-assessment of the northern Guinean “Koubia–Lessere unconformity” (KLU): Consequences on the geological correlations throughout West Africa

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