Sedimentology and Geochemical Characteristics of Upper Cretaceous Sediments of Imo Formation Around Arimogija Okeluse, Southwestern Nigeria

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dc.contributor.authorHakeem Bolaji OLAWUMI; Rafiu Babatunde BALE and Suraju Adesina ADEPOJU
dc.date.accessioned2025-01-28T21:19:21Z
dc.date.available2025-01-28T21:19:21Z
dc.date.issued2014
dc.description.abstractSediments of the Paleocene Imo Formation exposed at the southwestern flank of Anambra Basin at Sobe, Arimogija and Okeluse area, southwestern Nigeria. The sediments consisting limestones, sandstones and minor claystones and shales and intercalated ironstones were studied based on sedimentological and petrological charateristics for paleoenvironmental deduction. Field observation indicated that all the beds constituting this exposure are laminated and exhibit a coarsening upward succession. The statistical result from the grain size analysis of the siliclastic sediments shows the sandstones are coarse to medium sands (0.20 to 1.50ɸ), very well to moderatelywell sorted (0.26 to 1.12 ɸ) with skewness value ranges from nearly symmetrical though very positively skewed to positively skewed (-0.07 to 0.91) characterized by platykurtic to extremely leptokurtic (0.76 to 6.83) particle size distributions. Petrographic study of these sandstone reveal that its constituents is averagely of angular to sub-angular quartz (85%), feldspar (1.4 %), rock fragment and (9.5 %) and ≤ 3% cementing iron-oxide (goethite and haematite) phases, texturally immature and sub-arkosic. The limestone comprises of bioclastic wackestone, bioclastic wackestonepackstone, dolomitised bioclasticwackestone and mudstones microfacies with the bioclasts being broken shells of pelecypods, brachiopods and algae much of which have been partly recrystallised to sparry calcites. Geochemical and mineralogical constituents also show that the limestones are shallow marine deposits that have variably suffered early to mid diagenesis including dolomitisation. The prevailing basin condition was highly fluctuating with diverse fluvial channel and relativelyprotected shallow marine depoenvironments.
dc.identifier.urihttps://kwasuspace.kwasu.edu.ng/handle/123456789/3520
dc.language.isoen
dc.publisherInternational Journal of Research (IJR)
dc.titleSedimentology and Geochemical Characteristics of Upper Cretaceous Sediments of Imo Formation Around Arimogija Okeluse, Southwestern Nigeria
dc.typeArticle
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