Isotope characterisation of deep aquifers in the Gwda catchment, northern Poland
Loading...
Date
2016-08
Authors
Advisor
Editor
Journal Title
Journal ISSN
Volume Title
Publisher
Instytut Geologii UAM
Title alternative
Abstract
We present the results of isotope measurements (δ 18 O, δ D, δ 13 C DIC and 14 C) and chemical analyses (TDS, TOC, HCO 3– ,
SO 42– , Cl – , NO 3– , NH 4+ , Ca 2+ , Mg 2+ Na + and K + ) conducted on groundwater samples collected from deep Cenozoic aqui-
fers. These aquifers are the basic source of drinking water at numerous localities within the study area in northern Po-
land. Most of the δ 18 O determinations are characterised by low variability (i.e., > 70 per cent of δ 18 O are between –9.5‰
and –9.2‰). In most cases tritium activity was not detected or its content slightly exceeded the uncertainty of measure-
ment (from ±0.3 T.U. to ± 0.5 T.U.). On average, 14 C activity is twice higher than that under similar conditions and in
hydrogeological systems. The δ 13 C DIC values fall within the –13.6‰ to –12.8‰ range. A slight variability is observed
when considering all isotope and chemical data within the study area and under these hydrogeological conditions. In
general, the results of isotope and chemical analyses seem to be homogeneous, indicating the presence of closely similar
groundwaters in the system, irrespective of geological formation. It is likely that there is a significant hydraulic connec-
tion between shallow and deep aquifers in the Gwda catchment, which indicates the potential for seepage of pollutants
from shallow Pleistocene to deep Miocene aquifers. This can endanger the latter by e.g., high concentrations of NO 3– ,
SO 42– and Cl – ions from shallow aquifers within the Gwda catchment.
Description
Sponsor
Keywords
Cenozoic aquifers, groundwater dating, stable isotopes, radiocarbon
Citation
Geologos, 2016, 22, 2,pp.137-147
Seria
ISBN
ISBN 978-83-232187-4-6
ISSN
ISSN 1426-8981