Boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield
International audience The Fennoscandian Shield has been subjected to several glaciations over the past million years, the last of which (Weichselian Ice Age) ended only at about 10Ka. Here we used boron isotopes and B contents to (a) establish the degree of water-rock interaction (WRI) and (b) clar...
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ftunivnantes:oai:HAL:hal-03757688v1 2023-05-15T16:12:51+02:00 Boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield Casanova, Joël Négrel, Philippe Blomqvist, Runar Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) 2005-01 https://hal-brgm.archives-ouvertes.fr/hal-03757688 https://doi.org/10.1016/j.watres.2004.09.015 en eng HAL CCSD IWA Publishing/Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.watres.2004.09.015 hal-03757688 https://hal-brgm.archives-ouvertes.fr/hal-03757688 doi:10.1016/j.watres.2004.09.015 ISSN: 0043-1354 Water Research https://hal-brgm.archives-ouvertes.fr/hal-03757688 Water Research, IWA Publishing/Elsevier, 2005, 39 (2-3), pp.362-370. ⟨10.1016/j.watres.2004.09.015⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2005 ftunivnantes https://doi.org/10.1016/j.watres.2004.09.015 2022-08-23T22:41:32Z International audience The Fennoscandian Shield has been subjected to several glaciations over the past million years, the last of which (Weichselian Ice Age) ended only at about 10Ka. Here we used boron isotopes and B contents to (a) establish the degree of water-rock interaction (WRI) and (b) clarify freezing processes within groundwaters from the Aspo site in Sweden and from various sites in Finland. The high delta(11)B values recorded by all groundwaters (up to 51.9 per thousand) including diluted, boron-poor, inland groundwaters suggest selective uptake of (10)B into ice related to freezing processes under permafrost conditions. According to co-existing ice and residual brines in a Canadian frozen mine, this fractionation process, enhanced by Rayleigh fractionation, can generate a natural field of isotopic variation around 60 per thousand and provides a new application of B isotope that makes possible to easily characterise groundwaters that underwent past permafrost conditions. Article in Journal/Newspaper Fennoscandian Ice permafrost Université de Nantes: HAL-UNIV-NANTES Water Research 39 2-3 362 370 |
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Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Casanova, Joël Négrel, Philippe Blomqvist, Runar Boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Fennoscandian Shield has been subjected to several glaciations over the past million years, the last of which (Weichselian Ice Age) ended only at about 10Ka. Here we used boron isotopes and B contents to (a) establish the degree of water-rock interaction (WRI) and (b) clarify freezing processes within groundwaters from the Aspo site in Sweden and from various sites in Finland. The high delta(11)B values recorded by all groundwaters (up to 51.9 per thousand) including diluted, boron-poor, inland groundwaters suggest selective uptake of (10)B into ice related to freezing processes under permafrost conditions. According to co-existing ice and residual brines in a Canadian frozen mine, this fractionation process, enhanced by Rayleigh fractionation, can generate a natural field of isotopic variation around 60 per thousand and provides a new application of B isotope that makes possible to easily characterise groundwaters that underwent past permafrost conditions. |
author2 |
Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) |
format |
Article in Journal/Newspaper |
author |
Casanova, Joël Négrel, Philippe Blomqvist, Runar |
author_facet |
Casanova, Joël Négrel, Philippe Blomqvist, Runar |
author_sort |
Casanova, Joël |
title |
Boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield |
title_short |
Boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield |
title_full |
Boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield |
title_fullStr |
Boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield |
title_full_unstemmed |
Boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield |
title_sort |
boron isotope fractionation in groundwaters as an indicator of past permafrost conditions in the fractured crystalline bedrock of the fennoscandian shield |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal-brgm.archives-ouvertes.fr/hal-03757688 https://doi.org/10.1016/j.watres.2004.09.015 |
genre |
Fennoscandian Ice permafrost |
genre_facet |
Fennoscandian Ice permafrost |
op_source |
ISSN: 0043-1354 Water Research https://hal-brgm.archives-ouvertes.fr/hal-03757688 Water Research, IWA Publishing/Elsevier, 2005, 39 (2-3), pp.362-370. ⟨10.1016/j.watres.2004.09.015⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.watres.2004.09.015 hal-03757688 https://hal-brgm.archives-ouvertes.fr/hal-03757688 doi:10.1016/j.watres.2004.09.015 |
op_doi |
https://doi.org/10.1016/j.watres.2004.09.015 |
container_title |
Water Research |
container_volume |
39 |
container_issue |
2-3 |
container_start_page |
362 |
op_container_end_page |
370 |
_version_ |
1765998468164222976 |