Comparative Studies of Rare Earth Elements in Groundwaters and Aquifer Materials from the Southern Great Basin

Journal of Environmental Hydrology Volume 17 Paper 22 September 2009 1 The study area is located in the Pampean Plain (Cordoba, Argentina), where the groundwater resources of major interest are confined deep aquifers, which are often used due to the poor quality of the shallow unconfined aquifer. The study objective is to present a preliminary hydrogeochemical and isotopic model of the deep aquifers. Hydrogeological and isotopic analyses are used to characterize the deep aquifers. Three deep multilayered aquifer systems were defined taking into account groundwater quality: a semiconfined lower deep system, a confined system with a low degree of confinement and a highly confined sytem. All have hypothermal and mesothermal sodium sulphate type waters. The isotopic composition of local and western allochthonous streams, and the characteristics of the deepest confined aquifers, suggest deep aquifer recharge is located outside the study area in the perimountain western region. ISOTOPIC AND GEOCHEMICAL ASSESSMENT OF CONFINED THERMAL AQUIFERS OF SOUTHERN CORDOBA PROVINCE, ARGENTINA

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Hydrogeological Characterization of the Thyspunt Area, Eastern Cape Province, South Africa

Hydrology (2020)

Seeke C. Mohuba Tamiru Abiye Molla Demlie Moneri. J. Modiba

This paper presents a comprehensive hydrogeological investigation that involves field work, aquifer test, hydrogeochemical analysis, environmental isotope analysis, and interpretations around a proposed nuclear power facility in South Africa. The study was undertaken to test the complementarity of the various methods in the coastal aquifer and to verify the hydrogeological conditions within and around the site. The study revealed the presence of two types of aquifers: an upper primary aquifer made up of the Cenozoic deposits of the Algoa Group, and a deeper fractured aquifer made of the Palaezoic Table Mountain Group (TMG) metasedimentary rocks. Owing to ductile deformation in the form of folding, the fractured quartzite and shale aquifers resulted in an artesian condition, often characterized by slightly acidic (pH ≤ 6) and iron-rich groundwater. The most important hydrogeochemical processes responsible for the observed changes in the hydrochemical composition and facies are mineral dissolution, ion exchange and mixing. The environmental isotope results suggest that all groundwater samples are characterized by a depleted δ18O and δ2H signal, indicating high latitude moisture source (southern polar region) and recharge from rainfall, with no or minimal evaporation before and during infiltration. Similarities in the stable isotope signatures between the deeper and shallow aquifer confirm the presence of a strong hydraulic link. The residence time of groundwater in the aquifers underlying the proposed nuclear power plant is estimated using tritium (3H) and 14C, and the results indicate that in the shallow aquifer it ranges from recent recharge to 50 years, and in the deeper aquifer, it ranges from 430 ± 5 years to 1000 ± 10 years, which exists in a quasi-pristine condition.

10.3390/hydrology7030049

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Heterogeneities and interconnections in groundwater: Coupled B, and Li isotope variations in a large aquifer system (Eocene sand aquifer, south western France)

AGUFM (2010)

Philippe Négrel Romain Millot Emmanuelle Pételet-Giraud Catherine Guerrot Agnès Brenot

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Hydrochemical characterization of complex volcanic aquifers in a continental rifted zone: the Middle Awash basin, Ethiopia

Hydrogeology Journal (2011)

Wakgari Furi Moumtaz Razack Tamiru Abiye Seifu Kebede Dagnachew Legesse