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Article

Radiocarbon Dating and Stable Isotopes Content in the Assessment of Groundwater Recharge at Santiago Island, Republic of Cape Verde

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Centro de Ciências e Tecnologias Nucleares (C2TN), Departamento de Engenharia e Ciências Nucleares (DECN), Instituto Superior Técnico, Universidade de Lisboa, Estrada Nacional 10, ao km 139,7, 2695-066 Bobadela LRS, Portugal
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Faculdade de Ciências e Tecnologia, Universidade de Cabo Verde, Zona K do Palmarejo Grande, Praia, Santiago, Cape Verde
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Centro de Recursos Naturais e Ambiente (CERENA), Departamento de Engenharia Civil, Arquitetura e Georrecursos (DECivil), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
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Instituto D. Luiz (IDL), Faculdade de Lisboa, Universidade de Lisboa, Campo Grande 016, 1749-016 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Dimitrios E. Alexakis
Water 2022, 14(15), 2339; https://doi.org/10.3390/w14152339
Received: 9 June 2022 / Revised: 22 July 2022 / Accepted: 26 July 2022 / Published: 28 July 2022
(This article belongs to the Special Issue The Use of Environmental Isotopes in Hydrogeology)
The over-exploitation of coastal aquifers has led to seawater intrusion issues in many parts of the globe; this problem, which is associated with water recharge deficit and anthropogenic pollution, represents the main source of groundwater degradation in Santiago Island in the Republic of Cape Verde’s archipelago. Brackish groundwater for agriculture and human consumption is being provided to several areas on Santiago Island as the only type of available water. Chemical and isotopic data obtained in three main groundwater systems were used in the characterization of the groundwater resources and in the identification of the main source responsible for their degradation. The obtained results indicate water–rock interaction as the major process responsible for the groundwater quality reflecting its lithological composition. Carbonatite dissolution can be partially responsible for the calcium increase along the groundwater flow path. Isotopic data (δ2H, δ18O; 3H and 14C) combined with the water chemistry provided a wide characterization of the groundwater recharge and identification of salinization processes (like seawater intrusion and marine aerosols dissolution in different sectors of the island). In the eastern part of Santiago Island, a different isotopic pattern (2H-18O) was observed in the groundwater samples, which was likely ascribed to different climate conditions. Carbon-14 determinations indicate apparent groundwater ages between 3.5 and 5.1 ka BP. View Full-Text
Keywords: stable isotopes; groundwater salinization; radiocarbon dating; semi-arid climate; Santiago Island; Republic of Cape Verde stable isotopes; groundwater salinization; radiocarbon dating; semi-arid climate; Santiago Island; Republic of Cape Verde
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MDPI and ACS Style

Carreira, P.M.; Lobo de Pina, A.; da Mota Gomes, A.; Marques, J.M.; Monteiro Santos, F. Radiocarbon Dating and Stable Isotopes Content in the Assessment of Groundwater Recharge at Santiago Island, Republic of Cape Verde. Water 2022, 14, 2339. https://doi.org/10.3390/w14152339

AMA Style

Carreira PM, Lobo de Pina A, da Mota Gomes A, Marques JM, Monteiro Santos F. Radiocarbon Dating and Stable Isotopes Content in the Assessment of Groundwater Recharge at Santiago Island, Republic of Cape Verde. Water. 2022; 14(15):2339. https://doi.org/10.3390/w14152339

Chicago/Turabian Style

Carreira, Paula M., António Lobo de Pina, Alberto da Mota Gomes, José M. Marques, and Fernando Monteiro Santos. 2022. "Radiocarbon Dating and Stable Isotopes Content in the Assessment of Groundwater Recharge at Santiago Island, Republic of Cape Verde" Water 14, no. 15: 2339. https://doi.org/10.3390/w14152339

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