Hydrogeochemistry and groundwater origin of the Basses-Laurentides sedimentary rock aquifer system, St. Lawrence Lowlands, Québec, Canada |
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| Authors: | Vincent Cloutier René Lefebvre Martine M Savard Édith Bourque René Therrien |
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| Institution: | (1) Institut national de la recherche scientifique, INRS-Eau, Terre & Environnement, now at Université du Québec en Abitibi-Témiscamingue, 341 rue Principale Nord, Amos (Québec), J9T 2L8, Canada;(2) Institut national de la recherche scientifique, INRS-Eau, Terre & Environnement, 490 rue de la Couronne, Québec (Québec), G1K 9A9, Canada;(3) Geological Survey of Canada, Natural Resources Canada, 490 rue de la Couronne, Québec, (Québec), G1K 9A9, Canada;(4) Geological Survey of Canada, now at Bureau d'audiences publiques sur l'environnement, 575 rue Saint-Amable, Suite 2.10, Québec (Québec), G1R 6A6, Canada;(5) Département de géologie et de génie géologique, Université Laval, Sainte-Foy (Québec), G1K 7P4, Canada |
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| Abstract: | A comprehensive hydrogeochemical study was carried out in the Paleozoic Basses-Laurentides sedimentary rock aquifer system in Québec over a 1500 km2 study area. Groundwater samples were collected at 153 sites, characterizing all geological and hydrogeological units to a maximum depth of 140 m. Groundwater was analyzed for major, minor and trace inorganic constituents, stable isotopes δ 2H, δ 18O, and δ 13C of dissolved inorganic carbon (DIC), and some samples were analyzed for 3H, and 14C of DIC. The regional distribution of groundwater types shows that the hydrogeological conditions exert a dominant control on the major ions chemistry of groundwater. Preferential recharge areas are characterized by tritiated Ca-Mg-HCO3 groundwater, and confined conditions by submodern Na-HCO3 and Na-Cl groundwater types. Two groundwater end-members are identified in the aquifer system, modern meteoric water and Pleistocene Champlain Sea water. The region displays significant variations of groundwater geochemistry and quality controlled by glaciation, Champlain Sea invasion, lithological rock diversity, and flow system scales. This situation leads to varied groundwater types and origins within a restricted area. |
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| Keywords: | Hydrogeochemistry Stable isotopes Groundwater characterisation Sedimentary rock Canada |
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