87 Sr/ 86 Sr of brines from the Fennoscandian Shield: a synthesis of groundwater isotopic data from the Baltic Sea region

International audience High salinity CaNaCl brines occur in Sweden and Finland. The complex geological history of the Fennoscandian Shield is reflected by the wide range of saline waters whose chemical compositions have been explained by local waterrock interaction, simple evolution of relict sea wa...

Full description

Bibliographic Details
Published in:Canadian Journal of Earth Sciences
Main Authors: Négrel, Philippe, Casanova, Joël, Blomqvist, Runar
Other Authors: Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Geological Survey of Finland = Geologian tutkimuskeskus tuottaa (GKT)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2005
Subjects:
Online Access:https://hal-brgm.archives-ouvertes.fr/hal-03763138
https://doi.org/10.1139/E04-103
id ftunivnantes:oai:HAL:hal-03763138v1
record_format openpolar
spelling ftunivnantes:oai:HAL:hal-03763138v1 2023-05-15T16:12:50+02:00 87 Sr/ 86 Sr of brines from the Fennoscandian Shield: a synthesis of groundwater isotopic data from the Baltic Sea region Négrel, Philippe Casanova, Joël Blomqvist, Runar Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) Geological Survey of Finland = Geologian tutkimuskeskus tuottaa (GKT) 2005-03-01 https://hal-brgm.archives-ouvertes.fr/hal-03763138 https://doi.org/10.1139/E04-103 en eng HAL CCSD National Research Council Canada info:eu-repo/semantics/altIdentifier/doi/10.1139/E04-103 hal-03763138 https://hal-brgm.archives-ouvertes.fr/hal-03763138 doi:10.1139/E04-103 ISSN: 0008-4077 EISSN: 1480-3313 Canadian journal of earth sciences https://hal-brgm.archives-ouvertes.fr/hal-03763138 Canadian journal of earth sciences, 2005, 42 (3), pp.273-285. ⟨10.1139/E04-103⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2005 ftunivnantes https://doi.org/10.1139/E04-103 2023-02-22T01:39:47Z International audience High salinity CaNaCl brines occur in Sweden and Finland. The complex geological history of the Fennoscandian Shield is reflected by the wide range of saline waters whose chemical compositions have been explained by local waterrock interaction, simple evolution of relict sea water, or freezing of sea water during glacial periods. This study deals with the present knowledge of Sr isotopes in groundwater from the Fennoscandian Shield to better constrain the origin of their deep saline component. Two different mixing trends are seen between Äspö Island groundwater and the Baltic Sea. The first trend links the North Sea to rivers through various dilution levels in the Baltic; the second trend is a simple linear relationship through Äspö groundwaters, agreeing with a binary mixing between a Baltic end-member and a highly Sr-concentrated fluid. Strontium isotope compositions are presented for precipitation in Finland and Sweden, the Baltic Sea, and the river waters draining the Fennoscandian Shield, and for groundwaters from several sites in the Fennoscandian Shield. At least six mixing lines between rain-and-snow input and surface waters can be drawn in each region around the Baltic Sea, reflecting a first step of waterrock interaction. A second series of calculated lines links the surface end-members and the deep brines, and defines a range of 87 Sr/ 86 Sr ratios for the deep brines at each site. All sites show a specific 87 Sr/ 86 Sr signature and the large 87 Sr/ 86 Sr variations is site specific. The well-constrained 87 Sr/ 86 Sr signatures in deep brines should correspond to a large, well-mixed, and homogeneous water reservoir. Des saumures fortement concentrées, de type Ca–Na–Cl, existent en Finlande et Suède. L'histoire géologique complexe du bouclier Fennoscandien se traduit par une grande diversité géochimique de ces saumures dont l'origine a été interprétée soit comme le résultat d'interactions eau-roche, soit de l'évolution d'anciennes eaux marines ou bien du gel d'eaux marines au ... Article in Journal/Newspaper Fennoscandian Université de Nantes: HAL-UNIV-NANTES Canadian Journal of Earth Sciences 42 3 273 285
institution 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
Négrel, Philippe
Casanova, Joël
Blomqvist, Runar
87 Sr/ 86 Sr of brines from the Fennoscandian Shield: a synthesis of groundwater isotopic data from the Baltic Sea region
topic_facet [SDU.STU]Sciences of the Universe [physics]/Earth Sciences
description International audience High salinity CaNaCl brines occur in Sweden and Finland. The complex geological history of the Fennoscandian Shield is reflected by the wide range of saline waters whose chemical compositions have been explained by local waterrock interaction, simple evolution of relict sea water, or freezing of sea water during glacial periods. This study deals with the present knowledge of Sr isotopes in groundwater from the Fennoscandian Shield to better constrain the origin of their deep saline component. Two different mixing trends are seen between Äspö Island groundwater and the Baltic Sea. The first trend links the North Sea to rivers through various dilution levels in the Baltic; the second trend is a simple linear relationship through Äspö groundwaters, agreeing with a binary mixing between a Baltic end-member and a highly Sr-concentrated fluid. Strontium isotope compositions are presented for precipitation in Finland and Sweden, the Baltic Sea, and the river waters draining the Fennoscandian Shield, and for groundwaters from several sites in the Fennoscandian Shield. At least six mixing lines between rain-and-snow input and surface waters can be drawn in each region around the Baltic Sea, reflecting a first step of waterrock interaction. A second series of calculated lines links the surface end-members and the deep brines, and defines a range of 87 Sr/ 86 Sr ratios for the deep brines at each site. All sites show a specific 87 Sr/ 86 Sr signature and the large 87 Sr/ 86 Sr variations is site specific. The well-constrained 87 Sr/ 86 Sr signatures in deep brines should correspond to a large, well-mixed, and homogeneous water reservoir. Des saumures fortement concentrées, de type Ca–Na–Cl, existent en Finlande et Suède. L'histoire géologique complexe du bouclier Fennoscandien se traduit par une grande diversité géochimique de ces saumures dont l'origine a été interprétée soit comme le résultat d'interactions eau-roche, soit de l'évolution d'anciennes eaux marines ou bien du gel d'eaux marines au ...
author2 Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)
Geological Survey of Finland = Geologian tutkimuskeskus tuottaa (GKT)
format Article in Journal/Newspaper
author Négrel, Philippe
Casanova, Joël
Blomqvist, Runar
author_facet Négrel, Philippe
Casanova, Joël
Blomqvist, Runar
author_sort Négrel, Philippe
title 87 Sr/ 86 Sr of brines from the Fennoscandian Shield: a synthesis of groundwater isotopic data from the Baltic Sea region
title_short 87 Sr/ 86 Sr of brines from the Fennoscandian Shield: a synthesis of groundwater isotopic data from the Baltic Sea region
title_full 87 Sr/ 86 Sr of brines from the Fennoscandian Shield: a synthesis of groundwater isotopic data from the Baltic Sea region
title_fullStr 87 Sr/ 86 Sr of brines from the Fennoscandian Shield: a synthesis of groundwater isotopic data from the Baltic Sea region
title_full_unstemmed 87 Sr/ 86 Sr of brines from the Fennoscandian Shield: a synthesis of groundwater isotopic data from the Baltic Sea region
title_sort 87 sr/ 86 sr of brines from the fennoscandian shield: a synthesis of groundwater isotopic data from the baltic sea region
publisher HAL CCSD
publishDate 2005
url https://hal-brgm.archives-ouvertes.fr/hal-03763138
https://doi.org/10.1139/E04-103
genre Fennoscandian
genre_facet Fennoscandian
op_source ISSN: 0008-4077
EISSN: 1480-3313
Canadian journal of earth sciences
https://hal-brgm.archives-ouvertes.fr/hal-03763138
Canadian journal of earth sciences, 2005, 42 (3), pp.273-285. ⟨10.1139/E04-103⟩
op_relation info:eu-repo/semantics/altIdentifier/doi/10.1139/E04-103
hal-03763138
https://hal-brgm.archives-ouvertes.fr/hal-03763138
doi:10.1139/E04-103
op_doi https://doi.org/10.1139/E04-103
container_title Canadian Journal of Earth Sciences
container_volume 42
container_issue 3
container_start_page 273
op_container_end_page 285
_version_ 1765998442825383936