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 |
| |
| Institution: | 1. Institute of Geology at Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia;2. Institute of Environmental Physics, University of Heidelberg, Neuenheimer Feld 229, Heidelberg, Germany;3. Department of Hydrogeology and Engineering Geology, Vilnius University, Čiurlionio 21, 2009 Vilnius, Lithuania;4. Geological Survey of Estonia, Kadaka tee 82, 12618 Tallinn, Estonia;1. Applied Research Center, Florida International University, 10555 W. Flagler Street, Miami, FL 33174, USA;2. Pacific Northwest National Laboratory, PO Box 999, K3-62, Richland, WA 99352, USA;1. Institut de Radioprotection et de Sûreté Nucléaire, 31 Allée Du Général Leclerc, F92260 Fontenay-aux-Roses, France;2. Aix Marseille Univ., CNRS, IRD, Coll. De France, CEREGE, Aix-en-Provence, France;1. Institute of Chemistry, Academy Street, 5, Chisinau, MD 2028, Republic of Moldova;2. Department of Chemistry, Mississippi State University, Mississippi State, Box 9573, MS 38962, United States;3. Centre for Research In Electroanalytical Technologies (CREATE), Department of Science, Institute of Technology Tallaght, Tallaght, Dublin 24, Ireland;4. Dundalk Institute of Technology, Dundalk Co. Louth, Ireland;5. École Supérieure de Phisique et de Chimie Industrielles, 10 rue Vauquelin, 75231 Paris Cedex, France |
| |
| Abstract: | 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). |
| |
| Keywords: | Palaeohydrogeology Glacial meltwater Mixing Freshening Ion exchange |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
