Staff View: Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil

Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil

The 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 eva...

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Main Authors:	Silva, Priscila Sousa, Campos, José Eloi Guimarães, Cunha, Luciano Soares, Mancini, Luís Henrique
Format:	Artigo
Language:	English
Published:	Fundação Gorceix 2019
Subjects:	Recarga de águas subterrâneas Salinização da água Aquíferos
Online Access:	http://repositorio.unb.br/handle/10482/33731 http://dx.doi.org/10.1590/0370-44672016710178
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spelling	ir-10482-337312019-02-04T14:12:26Z Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil Silva, Priscila Sousa Campos, José Eloi Guimarães Cunha, Luciano Soares Mancini, Luís Henrique Recarga de águas subterrâneas Salinização da água Aquíferos The 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. 2019-01-02T13:57:56Z 2019-01-02T13:57:56Z 2018 Artigo SILVA, 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. http://repositorio.unb.br/handle/10482/33731 http://dx.doi.org/10.1590/0370-44672016710178 en Acesso Aberto application/pdf Fundação Gorceix
institution	REPOSITORIO UNB
collection	REPOSITORIO UNB
language	English
topic	Recarga de águas subterrâneas Salinização da água Aquíferos
spellingShingle	Recarga de águas subterrâneas Salinização da água Aquíferos Silva, Priscila Sousa Campos, José Eloi Guimarães Cunha, Luciano Soares Mancini, Luís Henrique Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil
description	The 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.
format	Artigo
author	Silva, Priscila Sousa Campos, José Eloi Guimarães Cunha, Luciano Soares Mancini, Luís Henrique
author_sort	Silva, Priscila Sousa
title	Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil
title_short	Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil
title_full	Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil
title_fullStr	Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil
title_full_unstemmed	Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil
title_sort	relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, petrolina region, pernambuco state, brazil
publisher	Fundação Gorceix
publishDate	2019
url	http://repositorio.unb.br/handle/10482/33731 http://dx.doi.org/10.1590/0370-44672016710178
_version_	1641988304567009280
score	13.657419

Relationships of stable isotopes, water-rock interaction and salinization in fractured aquifers, Petrolina region, Pernambuco State, Brazil

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