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dc.contributor.authorSilva, Priscila Sousapt_BR
dc.contributor.authorCampos, José Eloi Guimarãespt_BR
dc.contributor.authorCunha, Luciano Soarespt_BR
dc.contributor.authorMancini, Luís Henriquept_BR
dc.date.accessioned2019-01-02T13:57:56Z-
dc.date.available2019-01-02T13:57:56Z-
dc.date.issued2018pt_BR
dc.identifier.citationSILVA, Priscila Sousa et al. Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil. REM - International Engineering Journal, Ouro Preto, v. 71, n. 1, p. 19-25, mar. 2018. DOI: http://dx.doi.org/10.1590/0370-44672016710178. Disponível em: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2018000100019&lng=en&nrm=iso. Acesso em: 04 fev. 2019.pt_BR
dc.identifier.urihttp://repositorio.unb.br/handle/10482/33731-
dc.language.isoenpt_BR
dc.publisherFundação Gorceixpt_BR
dc.rightsAcesso Abertopt_BR
dc.titleRelationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazilpt_BR
dc.typeArtigopt_BR
dc.subject.keywordRecarga de águas subterrâneaspt_BR
dc.subject.keywordSalinização da águapt_BR
dc.subject.keywordAquíferospt_BR
dc.identifier.doihttp://dx.doi.org/10.1590/0370-44672016710178pt_BR
dc.description.abstract1The Petrolina County, Pernambuco State, Brazil, presents specificities that make it unique from a hydrogeological point of view. Water resource scarcity is both a quantitative and qualitative issue. The climate is classified as semiarid, having low precipitation, along with high temperatures and evapotranspiration rates. Aquifer zones are related to low connected fractures resulting in a restricted water flow in the aquifer. The recharge is limited and the groundwater salinity is high. Stable isotope analyses of H and O were developed in groundwater samples (with different electrical conductivity) and surface water collected in a bypass channel flowing from the São Francisco River. The results were plotted in a dD ‰ versus δ18O ‰ graph along with the curves of the global and local meteoric water line. Groundwater samples showed unexpected results showing a lighter sign pattern when compared to the meteoric waters. More negative dD and δ18O values indicate an enrichment in light isotopes, which show that this process is not influenced by surface processes, where the enrichment occurs in heavy isotopes due to evaporation. The isotopic signature observed is interpreted either as resulting from the water-rock interaction, or as resulting from recharge from paleo rains. The waters are old and show restricted flow. So the water-rock contact time is extended. In the rock weathering processes, through the hydration of feldspars, there is preferential assimilation of heavy isotopes at the expense of the lighter ones that remain in the water. Analyses of the 87Sr/86Sr ratio and isotopic groundwater dating assist in the interpretations.-
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