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[ Article ] Benin and Western Nigeria Offshore Basins: A Stratigraphic Nomenclature Comparison

Date de soumission: 03-02-2017
Année de Publication: 2016
Entité/Laboratoire Autres laboratoires
Document type : Article
Discipline(s) : Science de la terre & Géographie Physique
Titre Benin and Western Nigeria Offshore Basins: A Stratigraphic Nomenclature Comparison
Auteurs d'ALMEIDA Gérard Alfred Franck [1], KAKI CHRISTOPHE [2], ADEOYE James Adejimi [3],
Journal: International Journal of Geosciences
Catégorie Journal: Internationale
Impact factor: 0.79
Volume Journal: 7
DOI: http://dx.doi.org/10.4236/ijg.2016.72014
Resume The Benin and Western Nigeria Offshore Basins, which are parts of an extensive basin called the Dahomey (Benin) Embayment, were formed during the Early Cretaceous under similar tectonic conditions and continental sedimentary environments. Based mainly on available lithological, biostratigraphic and aleoenvironmental data, this paper summarizes the stratigraphic succession of theses basins and attempts a comparison of these stratigraphic nomenclatures. The bulk of data shows that sedimentation begins with terrestrial at the base, passes through shallow marine, deep marine (with restrictive bottom circulation) and ends with open deep marine conditions. The stratigraphy of the Offshore Benin Basin was established later and considering lithological and paleontological similarities with formations of various southern Nigeria basins, the stratigraphic chart adopted for this basin was a mixed variant of various Southern Nigerian basins nomenclatures. For the first time, a correlation of stratigraphic charts of each basins and a schematic cross section showing their lithostratigraphic units, especially the Cretaceous-Paleocene interval which is petroliferous, are proposed. The study shows that the nomenclature adopted in Benin Republic must be revised by using type section/locality names for some particular Formations and widely accepted Formations names of Nigeria for the others. This will permit to avoid confusions as it is presently the case for the name “Afowo Formation” representing a Cretaceous sequence in Nigeria and which is use in Benin Republic to distinguish some sediments of Miocene age. Moreover, a High Resolution Biostratigraphy summary (including micropaleontology, nannopaleontology and palynology distributions) relating to each offshore basin is needed for sequences correlations and entire harmonization of the stratigraphic nomenclature of these offshore basins.
Mots clés Benin, Western Nigeria, Offshore Basins, Stratigraphy, Stratigraphic Nomenclature, Comparison
Pages 177 - 188
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