Scenarios of groundwater chemical evolution in a region of the Canadian Shield based on multivariate statistical analysis

Ghesquière, Ombeline; Walter, Julien; Chesnaux, Romain; Rouleau, Alain

doi:10.1016/j.ejrh.2015.06.004

Cited by 68 publications

(52 citation statements)

References 26 publications

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“…Because of their advantages in processing large-scale hydrochemical data sets, multivariate statistical methods have been successfully applied in the study of hydrogeochemical processes [17][18][19][20]. They have become powerful tools for characterizing the spatial and temporal variations of hydrogeochemistry and identifying the sources of chemical components.…”

Section: Introductionmentioning

confidence: 99%

The Evolution and Sources of Major Ions in Hot Springs in the Triassic Carbonates of Chongqing, China

Zhou

Guo

et al. 2020

Water

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Thermal groundwater in the Lower and Middle Triassic carbonates in Chongqing, China, is mainly concentrated in anticlines. Hot springs (32.9 to 57 °C) with SO4-Ca type waters and Total Dissolved Solids (TDS) of 1620 to 2929 mg/L emerge in the middle and the plunging ends of the structures. Multivariate methods are used to analyze the hydrochemical characteristics of the waters, and identify the sources of the main dissolved components, providing an insight into the evolution of the environment in which they formed. Hierarchical cluster analysis of compositional data differentiates samples in the study area into three categories: high TDS-high Ca2+ and SO42− water; medium TDS-high Na+ and Cl− water; and low TDS-high HCO3− water. Factor analysis and ion ratio relationships show that Ca2+ and SO42− are mainly derived from the dissolution of gypsum and anhydrite within the geothermal reservoir, with some addition of SO42− from coal-bearing cap rocks. The main source of HCO3−, is in the dissolution of dolomite and CO2 that also promotes the incongruent dissolution of albite and K-feldspar, adding Na+ and K+ to the groundwater. Reverse modelling of the transfers of each phase shows, in three models, that the minerals dissolved decrease progressively—with the exception of halite and albite. Combined with the hydrochemical characteristics of hot water in the same reservoir in the adjacent area (Cl-Na type, TDS of 13.37 g/L), a process of desalination of the hot water can be confirmed, which has not yet reached the ‘freshwater’ stage dominated by HCO3−.

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Section: Introductionmentioning

confidence: 99%

The Evolution and Sources of Major Ions in Hot Springs in the Triassic Carbonates of Chongqing, China

Zhou

Guo

et al. 2020

Water

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“…The hydrochemical of karstic environments varies according to the climate, water circulation, residence time, and mineralogy of the rocks of the aquifer [24]. In this perspective, it is expected that the integration of geochemical and statistical techniques helps elucidate the basic aspects of water-rock interaction, groundwater flow, and hydrochemical evolution [25].…”

Section: Introductionmentioning

confidence: 99%

Fluoride Levels in the Groundwater and Prevalence of Dental Fluorosis in the Municipality of Santana, in Region Karstic of West Bahia, Brazil

Gonçalves¹,

Santos²,

Coutinho³

et al. 2020

Groundwater Hydrology

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This chapter was aimed to investigate the relationship between the consumption of water of Bambuí Aquifer with natural fluoride levels and the prevalence of dental fluorosis in the municipality of Santana, Bahia, Brazil. Hydrochemistry and cluster analysis indicated that there were two groups differentiable in relation to TDS, pH, F-, rNa + /rCa 2+ , and saturation indexes of minerals. The fluoride concentration varied from 0.05 to 9.16 mg.L −1 in the samples and the prevalence of dental fluorosis was 53%, 17% moderate, or severe, which was associated of the consumption of groundwater. The toxic levels of fluoride reached 47% of the samples, where the risk of skeletal fluorosis (20%) and incapacitating fluorosis (20%) was estimated. The water supply service should include the monitoring of fluoride in groundwater, the implementation of sanitary and environmental health surveillance of endemic fluorosis, and the continuing training of professionals for health in this municipality.

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“…A composição hidrogeoquímica de meios cársticos varia em função de diversos fatores, a exemplo do tempo de residência, distância percorrida, mineralogia e geologia das rochas encaixantes do aquífero (MORAL et al, 2008). Segundo Güler et al (2002) e Ghesquière et al (2015), a aplicação integrada de técnicas químicas, isotópicas e estatísticas contribuem para a investigação hidrogeoquímica uma vez que disponibilizam informações sobre a evolução composição química das águas subterrâneas, a interação água-rocha e fluxo subterrâneo.…”

Section: Introductionunclassified

Composição isotópica (δ18O, δ2H e δ13CCID) das águas subterrâneas dos municípios de Feira da Mata e Santana (BA)

et al. 2019

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Esta pesquisa pretendeu caracterizar a composição isotópica das águas subterrâneas dos municípios de Feira da Mata e de Santana, no oeste da Bahia, Brasil. Foram coletadas águas em quinze poços perfurados nas rochas pelitocarbonáticas do Grupo Bambuí. As variáveis físico-químicas foram mensuradas in situ, por meio de sonda multiparâmetros, os cátions por ICP-OES e os ânions por titrimetria e espectrofotometria. Os valores da razão isotópica em δ 2 H e δ 18 O destacaram o papel da recarga pelas chuvas locais, infiltração rápida e pouca evaporação. Também, revelaram que as águas subterrâneas de Santana foram as mais evaporadas. Á composição isotópica em δ 13 C CID foi relacionada a um pequeno tempo de residência da água no aquífero, predominando valores similares a assinatura isotópica das plantas de ciclo fotossintético C 4 e das rochas carbonáticas. Esta tendência foi corroborada pela caracterização hidroquímicas. A análise de agrupamentos mostrou que os grupos hidroquímicos se distinguiram quanto aos valores da mineralização, saturação da solução nos minerais calcita e dolomita e razão isotópica em δ 13 C CID nas amostras de Feira da Mata ou de Santana. As alterações nestas variáveis acompanham a evolução geoquímica das águas bicarbonatadas cálcicas para as bicarbonatadas ou cloretadas sódicas, a partir das reações de troca de bases e da circulação da água no aquífero. A integração dos resultados isotópicos, razões geoquímicas, índice de saturação e a estatística multivariada revelou a relevância do intemperismo químicos de carbonatos e pelitos à qualidade da água.

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Scenarios of groundwater chemical evolution in a region of the Canadian Shield based on multivariate statistical analysis

Cited by 68 publications

References 26 publications

The Evolution and Sources of Major Ions in Hot Springs in the Triassic Carbonates of Chongqing, China

The Evolution and Sources of Major Ions in Hot Springs in the Triassic Carbonates of Chongqing, China

Fluoride Levels in the Groundwater and Prevalence of Dental Fluorosis in the Municipality of Santana, in Region Karstic of West Bahia, Brazil

Composição isotópica (δ18O, δ2H e δ13CCID) das águas subterrâneas dos municípios de Feira da Mata e Santana (BA)

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