Journal
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
Volume 13, Issue -, Pages 168-188Publisher
ELSEVIER
DOI: 10.1016/j.ejrh.2017.07.004
Keywords
Hydrogeochemistry; Groundwater salinization; Precambrian shield; Granular deposits; Multivariate analysis
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Fonds de recherche du Quebec - Nature et technologies (FRQNT)
- Fondation de l'universite du Quebec a Chicoutimi (FUQAC)
- Rio Tinto Alcan (RTA)
- Programme d'acquisition de connaissances sur les eaux souterraines of Quebec (PACES)
- Quebec Ministere du Developpement durable, de l'Environnement, de la Faune et des Parcs (MDDEFP)
- SLSJ region (Domaine-du-Roy)
- SLSJ region (Du-Fjord-Du-Saguenay)
- SLSJ region (Lac-Saint-Jean-Est)
- SLSJ region (Maria-Chapdelaine)
- SLSJ region (City of Saguenay)
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Study region: Groundwater from the Precambrian Shield rock and Pleistocene deposit aquifers in Saguenay-Lac-Saint-Jean region (> 13 000 km(2)) in the province of Quebec, Canada. Study focus: Interpretations are based on the combination of hierarchical cluster analysis (HCA) results, principal component analysis (PCA), binary plots investigations ([Na+, Ca2+, Br-] vs. Cl-; Ca2+ vs. HCO3-; Ca2+ vs. Na+) and Piper diagram investigations. The HCA and PCA was applied on 321 samples to specifically enable the identification of two very distinct salinization paths that produce the brackish groundwater in the study area. New hydrological insights for the region: The results show that each of the two salinization paths exerts a major and different influence on the chemical signature of groundwater. Groundwater present in the crystalline bedrock naturally evolve from a recharge-type groundwater (Ca-HCO3-dominant) to a type of brackish groundwater (Ca-(Na)-Cl-dominant) due to water/rock interactions (plagioclase weathering and mixing with deep basement fluids). Groundwater evolution in confined aquifers is dominated by water/clay interactions. The term water/clay interactions was introduced in this paper to account for a combination of processes: ion exchange and/or leaching of salt water trapped in the regional aquitard. Mixing with fossil seawater might also increase the groundwater salinity. PCA revealed that Ca2+, Sr2+, Ba2+ are highly correlated with groundwater from bedrock aquifers, while Mg2+, SiO2, K+, SO42- and HCO3- are more re-presentative of the regional confining conditions.
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