Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec
International audience Iron mining in Schefferville (1939–1977) in subarctic Quebec has left behind large numbers and quantities of tailing deposits. The impact of past mining activity on aquatic ecosystems in the Schefferville area has been studied using geochemical and isotopic (Pb, Zn and Fe) ana...
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Online Access: | https://hal.univ-lorraine.fr/hal-01769718 https://doi.org/10.1016/j.chemgeo.2015.07.028 |
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ftccsdartic:oai:HAL:hal-01769718v1 2023-05-15T18:28:19+02:00 Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec Aebischer, Stéphane Cloquet, Christophe Carignan, Jean Maurice, Charles Pienitz, Reinhard Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Paléoécologie Aquatique CEN - Laval Centre d'Etudes Nordiques (CEN) Université Laval Québec (ULaval)-Université Laval Québec (ULaval) Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Bureau de la connaissance géoscientifique du Québec Ministère de l’Énergie et des Ressources naturelles 2015-09 https://hal.univ-lorraine.fr/hal-01769718 https://doi.org/10.1016/j.chemgeo.2015.07.028 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2015.07.028 hal-01769718 https://hal.univ-lorraine.fr/hal-01769718 doi:10.1016/j.chemgeo.2015.07.028 ISSN: 0009-2541 Chemical Geology https://hal.univ-lorraine.fr/hal-01769718 Chemical Geology, Elsevier, 2015, 412, pp.167 - 178. ⟨10.1016/j.chemgeo.2015.07.028⟩ Isotopes Geochemistry Mining Environmental changes Lake sediments Schefferville [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2015 ftccsdartic https://doi.org/10.1016/j.chemgeo.2015.07.028 2021-10-24T06:54:02Z International audience Iron mining in Schefferville (1939–1977) in subarctic Quebec has left behind large numbers and quantities of tailing deposits. The impact of past mining activity on aquatic ecosystems in the Schefferville area has been studied using geochemical and isotopic (Pb, Zn and Fe) analyses of lake sediments, ore deposits, tailings and epiphytic lichens. Analysis of two sediment cores from Lakes Dauriat and Oksana reveals that the surface geochemical cycle of the Schefferville area has been profoundly disturbed by anthropogenic activity such as mining. Disturbances were particularly abrupt at the transitions from pre-mining to mining and mining to post-mining periods.Elemental and isotopic analyses of the lake sediments reveal four different end-member contributions to the lake sedimentation, with changes in terms of sources and source contribution observed throughout the sedimentation history. End-members were identified using Pb, Zn and Fe isotopes and are consistent for each element. Lead isotope ratios vary from highly radiogenic (206Pb/204Pb = 27) to less radiogenic (206Pb/204Pb = 17.7) from the bottom to the top of the sediment cores. Iron isotope compositions vary from − 0.2‰ to 1‰, the latter value remaining constant throughout the sedimentary history of Lake Oksana. A systematic difference in the Zn isotope ratios of the two lakes is also observed, and can be explained by local differences in basin lithology. In order to identify pollution sources, samples from ores and tailings and epiphytic lichens were measured as proxies of mining activity, lithology, and atmospheric deposition, respectively.The impact of anthropogenic activity is clearly evident in the sediment records and results from mining activity, as well as local urban and industrial activities (waste water inputs). Long-range atmospheric deposition also accounts for some of the variations in isotopic composition measured in the sediments. The systematic coupling of Pb isotopes with Zn or Fe isotopes allows us to identify and ... Article in Journal/Newspaper Subarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Chemical Geology 412 167 178 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Isotopes Geochemistry Mining Environmental changes Lake sediments Schefferville [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Isotopes Geochemistry Mining Environmental changes Lake sediments Schefferville [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Aebischer, Stéphane Cloquet, Christophe Carignan, Jean Maurice, Charles Pienitz, Reinhard Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec |
topic_facet |
Isotopes Geochemistry Mining Environmental changes Lake sediments Schefferville [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Iron mining in Schefferville (1939–1977) in subarctic Quebec has left behind large numbers and quantities of tailing deposits. The impact of past mining activity on aquatic ecosystems in the Schefferville area has been studied using geochemical and isotopic (Pb, Zn and Fe) analyses of lake sediments, ore deposits, tailings and epiphytic lichens. Analysis of two sediment cores from Lakes Dauriat and Oksana reveals that the surface geochemical cycle of the Schefferville area has been profoundly disturbed by anthropogenic activity such as mining. Disturbances were particularly abrupt at the transitions from pre-mining to mining and mining to post-mining periods.Elemental and isotopic analyses of the lake sediments reveal four different end-member contributions to the lake sedimentation, with changes in terms of sources and source contribution observed throughout the sedimentation history. End-members were identified using Pb, Zn and Fe isotopes and are consistent for each element. Lead isotope ratios vary from highly radiogenic (206Pb/204Pb = 27) to less radiogenic (206Pb/204Pb = 17.7) from the bottom to the top of the sediment cores. Iron isotope compositions vary from − 0.2‰ to 1‰, the latter value remaining constant throughout the sedimentary history of Lake Oksana. A systematic difference in the Zn isotope ratios of the two lakes is also observed, and can be explained by local differences in basin lithology. In order to identify pollution sources, samples from ores and tailings and epiphytic lichens were measured as proxies of mining activity, lithology, and atmospheric deposition, respectively.The impact of anthropogenic activity is clearly evident in the sediment records and results from mining activity, as well as local urban and industrial activities (waste water inputs). Long-range atmospheric deposition also accounts for some of the variations in isotopic composition measured in the sediments. The systematic coupling of Pb isotopes with Zn or Fe isotopes allows us to identify and ... |
author2 |
Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de Paléoécologie Aquatique CEN - Laval Centre d'Etudes Nordiques (CEN) Université Laval Québec (ULaval)-Université Laval Québec (ULaval) Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Bureau de la connaissance géoscientifique du Québec Ministère de l’Énergie et des Ressources naturelles |
format |
Article in Journal/Newspaper |
author |
Aebischer, Stéphane Cloquet, Christophe Carignan, Jean Maurice, Charles Pienitz, Reinhard |
author_facet |
Aebischer, Stéphane Cloquet, Christophe Carignan, Jean Maurice, Charles Pienitz, Reinhard |
author_sort |
Aebischer, Stéphane |
title |
Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec |
title_short |
Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec |
title_full |
Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec |
title_fullStr |
Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec |
title_full_unstemmed |
Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec |
title_sort |
disruption of the geochemical metal cycle during mining: multiple isotope studies of lake sediments from schefferville, subarctic québec |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.univ-lorraine.fr/hal-01769718 https://doi.org/10.1016/j.chemgeo.2015.07.028 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
ISSN: 0009-2541 Chemical Geology https://hal.univ-lorraine.fr/hal-01769718 Chemical Geology, Elsevier, 2015, 412, pp.167 - 178. ⟨10.1016/j.chemgeo.2015.07.028⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.chemgeo.2015.07.028 hal-01769718 https://hal.univ-lorraine.fr/hal-01769718 doi:10.1016/j.chemgeo.2015.07.028 |
op_doi |
https://doi.org/10.1016/j.chemgeo.2015.07.028 |
container_title |
Chemical Geology |
container_volume |
412 |
container_start_page |
167 |
op_container_end_page |
178 |
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1766210746815873024 |