Dating of glacial palaeogroundwater in the Ordovician-Cambrian aquifer system, northern Baltic Artesian Basin
The Ordovician-Cambrian aquifer system in the northern Baltic Artesian Basin contains glacial palaeogroundwater that originates from the Scandinavian Ice Sheet that covered the study area in the Pleistocene. Previously, no absolute dating of this palaeogroundwater has been attempted. In this multi-t...
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ftlithuaniansrc:oai:elaba:48327112 2023-05-15T16:41:39+02:00 Dating of glacial palaeogroundwater in the Ordovician-Cambrian aquifer system, northern Baltic Artesian Basin Pärn, Joonas Walraevens, Kristine van Camp, Marc Raidla, Valle Aeschbach, Werner Friedrich, Ronny Ivask, Jüri Kaup, Enn Martma, Tõnu Mažeika, Jonas Mokrik, Robert Weissbach, Therese Vaikmäe, Rein 2019 http://vu.lvb.lt/VU:ELABAPDB48327112&prefLang=en_US eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.apgeochem.2019.01.004 http://vu.lvb.lt/VU:ELABAPDB48327112&prefLang=en_US Applied geochemistry, Oxford : Elsevier Ltd, 2019, vol. 102, p. 64-76 ISSN 0883-2927 eISSN 1872-9134 Groundwater flow noble gases geochemical evolution helium concentration info:eu-repo/semantics/article 2019 ftlithuaniansrc https://doi.org/10.1016/j.apgeochem.2019.01.004 2021-12-02T00:40:20Z The Ordovician-Cambrian aquifer system in the northern Baltic Artesian Basin contains glacial palaeogroundwater that originates from the Scandinavian Ice Sheet that covered the study area in the Pleistocene. Previously, no absolute dating of this palaeogroundwater has been attempted. In this multi-tracer study, we use 3 H, 14 C, 4 He and stable isotopes of water to constrain the age distribution of groundwater. We apply the geochemical modelling approach developed by van der Kemp et al. (2000) and Blaser et al. (2010) to calculate the theoretical composition of recharge waters in three hypothetical conditions: modern, glacial and interstadial for 14 C model age calculations. In the second phase of the geochemical modelling, the calculated recharge water compositions are used to calculate the 14 C model ages using a series of inverse models developed with NETPATH. The calculated 14 C model ages show that the groundwater in the aquifer system originates from three different climatic periods: (1) the post-glacial period; (2) the Late Glacial Maximum (LGM) and (3) the pre-LGM period. A larger pre-LGM component seems to be present in the southern and north-eastern parts of the aquifer system where the radiogenic 4 He concentrations are higher (from ∼3.0·10 −5 to 5.5·10 −4 cc·g −1 ) and the stable isotopic composition of water is heavier (δ 18 O from −13.5‰ to −17.3‰). Glacial palaeogroundwater from the north-western part of the aquifer system is younger and has 14 C model ages that coincide with the end of the LGM period. It is also characterized by lower radiogenic 4 He concentrations (∼2.0·10 −5 cc·g −1 ) and lighter stable isotopic composition (δ 18 O from −17.7 to −22.4‰). Relations between radiogenic 4 He and 14 C model ages and between radiogenic 4 He and Cl − concentration show that groundwater in the aquifer system does not have a single well-defined age. Rather, the groundwater age distribution has been influenced by mixing between waters originating from end-members with strongly differing ages. Overall the results suggest, that in the shallower northern part of the aquifer system, significant changes in groundwater composition can be brought about by glacial meltwater intrusion during a single glaciation. However, multiple cycles of glacial advance and retreat are needed to transport glacial meltwater to the deeper parts of the aquifer system. Article in Journal/Newspaper Ice Sheet LSRC VL (Lithuanian Social Research Centre Virtual Library) Applied Geochemistry 102 64 76 |
institution |
Open Polar |
collection |
LSRC VL (Lithuanian Social Research Centre Virtual Library) |
op_collection_id |
ftlithuaniansrc |
language |
English |
topic |
Groundwater flow noble gases geochemical evolution helium concentration |
spellingShingle |
Groundwater flow noble gases geochemical evolution helium concentration Pärn, Joonas Walraevens, Kristine van Camp, Marc Raidla, Valle Aeschbach, Werner Friedrich, Ronny Ivask, Jüri Kaup, Enn Martma, Tõnu Mažeika, Jonas Mokrik, Robert Weissbach, Therese Vaikmäe, Rein Dating of glacial palaeogroundwater in the Ordovician-Cambrian aquifer system, northern Baltic Artesian Basin |
topic_facet |
Groundwater flow noble gases geochemical evolution helium concentration |
description |
The Ordovician-Cambrian aquifer system in the northern Baltic Artesian Basin contains glacial palaeogroundwater that originates from the Scandinavian Ice Sheet that covered the study area in the Pleistocene. Previously, no absolute dating of this palaeogroundwater has been attempted. In this multi-tracer study, we use 3 H, 14 C, 4 He and stable isotopes of water to constrain the age distribution of groundwater. We apply the geochemical modelling approach developed by van der Kemp et al. (2000) and Blaser et al. (2010) to calculate the theoretical composition of recharge waters in three hypothetical conditions: modern, glacial and interstadial for 14 C model age calculations. In the second phase of the geochemical modelling, the calculated recharge water compositions are used to calculate the 14 C model ages using a series of inverse models developed with NETPATH. The calculated 14 C model ages show that the groundwater in the aquifer system originates from three different climatic periods: (1) the post-glacial period; (2) the Late Glacial Maximum (LGM) and (3) the pre-LGM period. A larger pre-LGM component seems to be present in the southern and north-eastern parts of the aquifer system where the radiogenic 4 He concentrations are higher (from ∼3.0·10 −5 to 5.5·10 −4 cc·g −1 ) and the stable isotopic composition of water is heavier (δ 18 O from −13.5‰ to −17.3‰). Glacial palaeogroundwater from the north-western part of the aquifer system is younger and has 14 C model ages that coincide with the end of the LGM period. It is also characterized by lower radiogenic 4 He concentrations (∼2.0·10 −5 cc·g −1 ) and lighter stable isotopic composition (δ 18 O from −17.7 to −22.4‰). Relations between radiogenic 4 He and 14 C model ages and between radiogenic 4 He and Cl − concentration show that groundwater in the aquifer system does not have a single well-defined age. Rather, the groundwater age distribution has been influenced by mixing between waters originating from end-members with strongly differing ages. Overall the results suggest, that in the shallower northern part of the aquifer system, significant changes in groundwater composition can be brought about by glacial meltwater intrusion during a single glaciation. However, multiple cycles of glacial advance and retreat are needed to transport glacial meltwater to the deeper parts of the aquifer system. |
format |
Article in Journal/Newspaper |
author |
Pärn, Joonas Walraevens, Kristine van Camp, Marc Raidla, Valle Aeschbach, Werner Friedrich, Ronny Ivask, Jüri Kaup, Enn Martma, Tõnu Mažeika, Jonas Mokrik, Robert Weissbach, Therese Vaikmäe, Rein |
author_facet |
Pärn, Joonas Walraevens, Kristine van Camp, Marc Raidla, Valle Aeschbach, Werner Friedrich, Ronny Ivask, Jüri Kaup, Enn Martma, Tõnu Mažeika, Jonas Mokrik, Robert Weissbach, Therese Vaikmäe, Rein |
author_sort |
Pärn, Joonas |
title |
Dating of glacial palaeogroundwater in the Ordovician-Cambrian aquifer system, northern Baltic Artesian Basin |
title_short |
Dating of glacial palaeogroundwater in the Ordovician-Cambrian aquifer system, northern Baltic Artesian Basin |
title_full |
Dating of glacial palaeogroundwater in the Ordovician-Cambrian aquifer system, northern Baltic Artesian Basin |
title_fullStr |
Dating of glacial palaeogroundwater in the Ordovician-Cambrian aquifer system, northern Baltic Artesian Basin |
title_full_unstemmed |
Dating of glacial palaeogroundwater in the Ordovician-Cambrian aquifer system, northern Baltic Artesian Basin |
title_sort |
dating of glacial palaeogroundwater in the ordovician-cambrian aquifer system, northern baltic artesian basin |
publishDate |
2019 |
url |
http://vu.lvb.lt/VU:ELABAPDB48327112&prefLang=en_US |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Applied geochemistry, Oxford : Elsevier Ltd, 2019, vol. 102, p. 64-76 ISSN 0883-2927 eISSN 1872-9134 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.apgeochem.2019.01.004 http://vu.lvb.lt/VU:ELABAPDB48327112&prefLang=en_US |
op_doi |
https://doi.org/10.1016/j.apgeochem.2019.01.004 |
container_title |
Applied Geochemistry |
container_volume |
102 |
container_start_page |
64 |
op_container_end_page |
76 |
_version_ |
1766032110537146368 |