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Book Chapter

Isotopic methods and their hydrogeochemical context in the investigation of palaeowaters

By
H. H. Loosli
H. H. Loosli
University of Bern, Climate and Environmental Physics, Sidlerstrasse 5, CH-3012, Bern, Switzerland
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W. Aeschbach-Hertig
W. Aeschbach-Hertig
EAWAG, Ueberlandstrasse 133, CH 8600 Dübendorf, Switzerland
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F. Barbecot
F. Barbecot
Université Paris-Sud, Lab. d’Hydrologie et de Géochimie Isotopique, Bat. 504, F-91405 Orsay Cedex, France
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P. Blaser
P. Blaser
University of Bern, Climate and Environmental Physics, Sidlerstrasse 5, CH-3012, Bern, Switzerland
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W. G. Darling
W. G. Darling
Hydrogeology Group, British Geological Survey, Maclean Building, Wallingford, Oxon, OX10 8BB UK
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L. Dever
L. Dever
Université Paris-Sud, Lab. d’Hydrologie et de Géochimie Isotopique, Bat. 504, F-91405 Orsay Cedex, France
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W. M. Edmunds
W. M. Edmunds
Hydrogeology Group, British Geological Survey, Maclean Building, Wallingford, Oxon, OX10 8BB UK
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R. Kipfer
R. Kipfer
EAWAG, Ueberlandstrasse 133, CH 8600 Dübendorf, Switzerland
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R. Purtschert
R. Purtschert
University of Bern, Climate and Environmental Physics, Sidlerstrasse 5, CH-3012, Bern, Switzerland
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K. Walraevens
K. Walraevens
Ghent University, Lab. Applied Geology and Hydrogeology, Krijgslaan 281, B-9000, Gent, Belgium
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Published:
January 01, 2001

Abstract

Isotope and geochemical techniques are the primary way in which the residence time, recharge conditions and subsequent evolution of palaeowaters can be determined. Isotopic species and noble gas concentrations are used as residence time and palaeoclimate indicators. Among the former, 14C is pre-eminent in late Quaternary studies because of an age range which covers the Pleistocene–Holocene transition. However, its use is constrained by frequent difficulties in determining the dilution of dissolved 14C due to water–rock interaction. A combination of 14C data with 226Ra and 4He results may be useful for Holocene waters but they can also be used to validate the carbon systematics assumed for 14C dating. For waters beyond the range of 14C dating, 81Kr, 36Cl, 4He and chemical tracers can be applied.

Stable isotope ratios and noble gas concentrations primarily reflect climatic conditions at the time of recharge. While the noble gases provide absolute values for recharge temperatures, stable isotopes are only relative indicators that vary regionally. The PALAEAUX programme has examined these aspects in some detail by looking at the δ18O shift between Pleistocene and Holocene waters on the European scale, and by calculating δ18O/ΔT ratios from δ18O v. recharge temperature plots for aquifers at different distances from the Atlantic Ocean. Indications are that the more positive δ18O value of ocean water during the Pleistocene dominates in the more westerly European countries over the negative δ18O shift during cooler conditions. There are also indications that air-mass circulation during the Pleistocene was similar to the present day.

The evolution of a palaeowater can best be studied by measuring chemical tracers; this is possible in freshwater aquifers, where a clear trend of geochemical reactions is observed, and in freshening marine aquifers. Chemical and isotopic tracers can also be used to study the movement of the front between palaeowater and younger components that must be identified in coastal aquifers to guarantee a sustainable water use.

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Contents

Geological Society, London, Special Publications

Palaeowaters in Coastal Europe: Evolution of Groundwater since the Late Pleistocene

W. M. Edmunds
W. M. Edmunds
British Geological Survey, Wallingford, UK
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C. J. Milne
C. J. Milne
British Geological Survey, Wallingford, UK
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Geological Society of London
Volume
189
ISBN electronic:
9781862394377
Publication date:
January 01, 2001

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