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• W2033342010 abstract "Although there is no proof of the existence of salt-beds in the Benue Trough, outcrops of saline groundwaters are common features associated with the anticlinal structures in this trough. The outcrops in the Ogoja area, referred to here as the “Ogoja brine field”, situated at the eastern margin of the Lower Benue Trough, are presented as a case study. The saline groundwaters in this brine field, which occur as ponds and in dug-wells, support an age-old local salt production in this area. The saline waters are characterised as NaCl type with Na+ constituting 78–85% of the cations and Cl− accounting for at least 85% of the anions. Ogoja brines display specific straight-line relationships between chloride and alkaline-earth metals, especially with lithium. Barium and strontium appear to be enriched, the former due to an environment free of sulphate. On the other hand, the observed depletion of the underground saline waters with respect to tritium (<1.5 TU) and stable isotopes of oxygen and hydrogen (<−3.5‰ δ18O and <-10.5‰ δ2H) suggests little or no surface in-put (or near surface mixing) relative to those of the surface saline ponds (−0.15 to −3.3‰ δ18O and −6 to −10.4‰ δ2H). The combination of hydrochemical and isotope data, coupled with the analyses of the stratigraphic setting of the area suggests that the brines are marine in origin, related to palaeo/fossil sea water embedded within the transgressive marine sediments, and/or disseminated (precipitated) salts formed within the regressive interbeds during the sedimentation cycle. Quoique la présence de couches de sel n'ait pas été démontrée dans le fossé de la Bénoué, il n'est pas rare d'y rencontrer des nappes phréatiques salines au niveau des structures anticlinales. La région d'Ogoja, appelée ici ‘champ des eaux salées d'Ogoja’, est prise comme cas d'espèce. Elle est située à la limite orientale du fossé de la basse Bénoué. Les eaux salines de ce champ se rencontrent dans des eaux stagnantes et des puits creusés par l'homme. Elles y font l'objet d'une production locale de sels, connue de tout temps. Les eaux salines appartiennent au type NaCl avec Na+ correspondant à 78–85% des cations et Cl− au moins à 85% des anions. Les eaux salées d'Ogoja présentent des corrélations rectilignes spécifiques entre le chlorure et les métaux alcalino-terreux, ainsi qu'en particulier avec le lithium. Il apparaît que le baryum et le strontium sont enrichis, le premier en raison d'un environnement dépourvu de sulfates. D'autre part, l'appauvrissement observé des eaux salines souterraines en tritium (<1.5 TU) et en isotopes stables d'oxygène et d'hydrogène (<-3.5‰ δ18O et ≤ 10.5‰ δ2H) suggère peu ou pas d'apport de surface (ou de mélange au voisinage de la surface) par comparaison avec les données des eaux stagnantes salées de surface (−0.15 à −3.3‰ δ18O et −6 à −10.4‰ δ2H). La combinaison des données hydrochimiques et isotopiques ainsi que l'analyse du contexte stratigraphique de la région suggèrent une origine marine des eaux salées en rapport avec de l'eau de mer fossile, piégée dans les sédiments marins de transgression et/ou dans des sels de dissémination (précipitation) formés lors du cycle sédimentaire dans les interlits de régression." @default.
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• W2033342010 date "1996-08-01" @default.
• W2033342010 modified "2023-10-16" @default.
• W2033342010 title "Origin of saline groundwaters in the Ogoja area, Lower Benue Trough, Nigeria" @default.
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• W2033342010 doi "https://doi.org/10.1016/s0899-5362(96)00065-6" @default.
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