Chemical analysis from two sediment cores of lake Dauriat and lake Oksana from Schefferville, subarctic Québec
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...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.874837 2023-05-15T18:28:21+02:00 Chemical analysis from two sediment cores of lake Dauriat and lake Oksana from Schefferville, subarctic Québec Aebischer, Stéphane Cloquet, Christophe Carignan, Jean Maurice, Pierre Pienitz, Reinhard MEDIAN LATITUDE: 54.729043 * MEDIAN LONGITUDE: -66.738489 * SOUTH-BOUND LATITUDE: 54.483900 * WEST-BOUND LONGITUDE: -66.928300 * NORTH-BOUND LATITUDE: 54.905800 * EAST-BOUND LONGITUDE: -66.523100 2017-04-26 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.874837 https://doi.org/10.1594/PANGAEA.874837 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.874837 https://doi.org/10.1594/PANGAEA.874837 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Aebischer, Stéphane; Cloquet, Christophe; Carignan, Jean; Maurice, Pierre; Pienitz, Reinhard (2015): Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec. Chemical Geology, 412, 167-178, https://doi.org/10.1016/j.chemgeo.2015.07.028 Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.874837 https://doi.org/10.1016/j.chemgeo.2015.07.028 2023-01-20T07:33:56Z 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 per mil to 1per mil, 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 constrain ... Dataset Subarctic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-66.928300,-66.523100,54.905800,54.483900) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
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 per mil to 1per mil, 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 constrain ... |
format |
Dataset |
author |
Aebischer, Stéphane Cloquet, Christophe Carignan, Jean Maurice, Pierre Pienitz, Reinhard |
spellingShingle |
Aebischer, Stéphane Cloquet, Christophe Carignan, Jean Maurice, Pierre Pienitz, Reinhard Chemical analysis from two sediment cores of lake Dauriat and lake Oksana from Schefferville, subarctic Québec |
author_facet |
Aebischer, Stéphane Cloquet, Christophe Carignan, Jean Maurice, Pierre Pienitz, Reinhard |
author_sort |
Aebischer, Stéphane |
title |
Chemical analysis from two sediment cores of lake Dauriat and lake Oksana from Schefferville, subarctic Québec |
title_short |
Chemical analysis from two sediment cores of lake Dauriat and lake Oksana from Schefferville, subarctic Québec |
title_full |
Chemical analysis from two sediment cores of lake Dauriat and lake Oksana from Schefferville, subarctic Québec |
title_fullStr |
Chemical analysis from two sediment cores of lake Dauriat and lake Oksana from Schefferville, subarctic Québec |
title_full_unstemmed |
Chemical analysis from two sediment cores of lake Dauriat and lake Oksana from Schefferville, subarctic Québec |
title_sort |
chemical analysis from two sediment cores of lake dauriat and lake oksana from schefferville, subarctic québec |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.874837 https://doi.org/10.1594/PANGAEA.874837 |
op_coverage |
MEDIAN LATITUDE: 54.729043 * MEDIAN LONGITUDE: -66.738489 * SOUTH-BOUND LATITUDE: 54.483900 * WEST-BOUND LONGITUDE: -66.928300 * NORTH-BOUND LATITUDE: 54.905800 * EAST-BOUND LONGITUDE: -66.523100 |
long_lat |
ENVELOPE(-66.928300,-66.523100,54.905800,54.483900) |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Supplement to: Aebischer, Stéphane; Cloquet, Christophe; Carignan, Jean; Maurice, Pierre; Pienitz, Reinhard (2015): Disruption of the geochemical metal cycle during mining: Multiple isotope studies of lake sediments from Schefferville, subarctic Québec. Chemical Geology, 412, 167-178, https://doi.org/10.1016/j.chemgeo.2015.07.028 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.874837 https://doi.org/10.1594/PANGAEA.874837 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.874837 https://doi.org/10.1016/j.chemgeo.2015.07.028 |
_version_ |
1766210798234894336 |