The recharge of glacial meltwater and its influence on the geochemical evolution of groundwater in the Ordovician-Cambrian aquifer system, northern part of the Baltic Artesian Basin

The geochemical evolution of groundwater in the Ordovician-Cambrian aquifer system in the northern part of the Baltic Artesian Basin (BAB) illustrates how continental glaciations have influenced groundwater systems in proglacial areas. The aquifer system contains water that has originated from vario...

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Main Authors: Pärn, Joonas (Author) , Raidla, Valle (Author) , Vaikmäe, Rein (Author) , Martma, Tõnu (Author) , Ivask, Jüri (Author) , Mokrik, Robert (Author) , Erg, Katrin (Author)
Format: Article (Journal)
Language:English
Published: 20 July 2016
In: Applied geochemistry
Year: 2016, Volume: 72, Pages: 125-135
DOI:10.1016/j.apgeochem.2016.07.007
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.apgeochem.2016.07.007
Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S0883292716301500
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Author Notes:Joonas Pärn, Valle Raidla, Rein Vaikmäe, Tõnu Martma, Jüri Ivask, Robert Mokrik, Katrin Erg

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520 |a The geochemical evolution of groundwater in the Ordovician-Cambrian aquifer system in the northern part of the Baltic Artesian Basin (BAB) illustrates how continental glaciations have influenced groundwater systems in proglacial areas. The aquifer system contains water that has originated from various end-members: recent meteoric water, glacial meltwater and relict Na-Cl brine. The saline formation water that occupied the aquifer system prior to the glacial meltwater intrusion has been diluted by meltwaters of advancing-retreating ice sheets. The diversity in the origin of groundwater in the aquifer system is illustrated by a wide variety in δ18O values that range from −11‰ to −22.5‰. These values are mostly depleted with respect to values found in modern precipitation in the area. The chemical and isotopic composition of groundwater has been influenced by mixing between waters originating from different end-members. In addition, the freshening of a previously saline water aquifer due to glacial meltwater intrusion has initiated various types of water-rock interaction (e.g. ion exchange, carbonate mineral dissolution). 
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