Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments
Sediment cores were collected from two lakes in the Courageous Lake Greenstone Belt (CLGB), central Northwest Territories, Canada, to examine the influence of late-Holocene warming on the transport and fate of arsenic (As) in sub-Arctic lakes. In both lakes, allochthonous As-bearing minerals (i.e. a...
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ftunivtasmania:oai:eprints.utas.edu.au:33721 2023-05-15T14:26:30+02:00 Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments Miller, CB Parsons, MB Jamieson, HE Ardakani, OH Gregory, BRB Galloway, JM 2019 https://eprints.utas.edu.au/33721/ unknown Elsevier Science Bv Miller, CB orcid:0000-0003-3241-0314 , Parsons, MB, Jamieson, HE, Ardakani, OH, Gregory, BRB and Galloway, JM 2019 , 'Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments' , Science of The Total Environment, vol. 709 , pp. 1-18 , doi:10.1016/j.scitotenv.2019.136115 <http://dx.doi.org/10.1016/j.scitotenv.2019.136115>. arsenic mobility climate change mine waste lake sediments organic matter geochemical baselines Article PeerReviewed 2019 ftunivtasmania https://doi.org/10.1016/j.scitotenv.2019.136115 2021-10-04T22:18:08Z Sediment cores were collected from two lakes in the Courageous Lake Greenstone Belt (CLGB), central Northwest Territories, Canada, to examine the influence of late-Holocene warming on the transport and fate of arsenic (As) in sub-Arctic lakes. In both lakes, allochthonous As-bearing minerals (i.e. arsenopyrite and scorodite) were identified in sediment deposited during times of both regional warming and cooling, suggesting that weathering of bedrock and derived surficial materials provides a continual source of As to lakes of the CLGB. However, maximum porewater As (84 μg·L−1 and 15 μg·L−1) and reactive organic matter (OM; aquatic and terrestrial-derived) concentrations in each lake are coincident with known periods of regional climate warming. It is inferred that increased biological production in surface waters and influx of terrigenous OM led to the release of sedimentary As to porewater through reductive dissolution of As-bearing Fe-(oxy)hydroxides and scorodite during episodes of regional warming. Elevated sedimentary As concentrations (median: 36 mg·kg−1; range: 29 to 49 mg·kg−1) are observed in sediment coeval with the Holocene Thermal Maximum (ca. 5430 ± 110 to 4070 ± 130 cal. years BP); at these depths, authigenic As-bearing framboidal pyrite is the primary host of As in sediment and the influence of organic matter on the precipitation of As-bearing framboidal pyrite is apparent petrographically. These findings suggest that increased biological productivity and weathering of terrestrial OM associated with climate warming influences redox cycles in the near-surface sediment and enhances the mobility of As in northern lakes. Knowledge generated from this study is relevant for predicting future climate change-driven variations in metal(loid) cycling in aquatic systems and can be used to interpret trends in long-term environmental monitoring data at historical, modern, and future metal mines in northern environments. Article in Journal/Newspaper Arctic Arctic Climate change Northwest Territories University of Tasmania: UTas ePrints Arctic Northwest Territories Canada Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Courageous Lake ENVELOPE(-111.251,-111.251,64.167,64.167) Science of The Total Environment 709 136115 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
arsenic mobility climate change mine waste lake sediments organic matter geochemical baselines |
spellingShingle |
arsenic mobility climate change mine waste lake sediments organic matter geochemical baselines Miller, CB Parsons, MB Jamieson, HE Ardakani, OH Gregory, BRB Galloway, JM Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments |
topic_facet |
arsenic mobility climate change mine waste lake sediments organic matter geochemical baselines |
description |
Sediment cores were collected from two lakes in the Courageous Lake Greenstone Belt (CLGB), central Northwest Territories, Canada, to examine the influence of late-Holocene warming on the transport and fate of arsenic (As) in sub-Arctic lakes. In both lakes, allochthonous As-bearing minerals (i.e. arsenopyrite and scorodite) were identified in sediment deposited during times of both regional warming and cooling, suggesting that weathering of bedrock and derived surficial materials provides a continual source of As to lakes of the CLGB. However, maximum porewater As (84 μg·L−1 and 15 μg·L−1) and reactive organic matter (OM; aquatic and terrestrial-derived) concentrations in each lake are coincident with known periods of regional climate warming. It is inferred that increased biological production in surface waters and influx of terrigenous OM led to the release of sedimentary As to porewater through reductive dissolution of As-bearing Fe-(oxy)hydroxides and scorodite during episodes of regional warming. Elevated sedimentary As concentrations (median: 36 mg·kg−1; range: 29 to 49 mg·kg−1) are observed in sediment coeval with the Holocene Thermal Maximum (ca. 5430 ± 110 to 4070 ± 130 cal. years BP); at these depths, authigenic As-bearing framboidal pyrite is the primary host of As in sediment and the influence of organic matter on the precipitation of As-bearing framboidal pyrite is apparent petrographically. These findings suggest that increased biological productivity and weathering of terrestrial OM associated with climate warming influences redox cycles in the near-surface sediment and enhances the mobility of As in northern lakes. Knowledge generated from this study is relevant for predicting future climate change-driven variations in metal(loid) cycling in aquatic systems and can be used to interpret trends in long-term environmental monitoring data at historical, modern, and future metal mines in northern environments. |
format |
Article in Journal/Newspaper |
author |
Miller, CB Parsons, MB Jamieson, HE Ardakani, OH Gregory, BRB Galloway, JM |
author_facet |
Miller, CB Parsons, MB Jamieson, HE Ardakani, OH Gregory, BRB Galloway, JM |
author_sort |
Miller, CB |
title |
Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments |
title_short |
Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments |
title_full |
Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments |
title_fullStr |
Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments |
title_full_unstemmed |
Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments |
title_sort |
influence of late-holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-arctic lake sediments |
publisher |
Elsevier Science Bv |
publishDate |
2019 |
url |
https://eprints.utas.edu.au/33721/ |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) ENVELOPE(-111.251,-111.251,64.167,64.167) |
geographic |
Arctic Northwest Territories Canada Arctic Lake Courageous Lake |
geographic_facet |
Arctic Northwest Territories Canada Arctic Lake Courageous Lake |
genre |
Arctic Arctic Climate change Northwest Territories |
genre_facet |
Arctic Arctic Climate change Northwest Territories |
op_relation |
Miller, CB orcid:0000-0003-3241-0314 , Parsons, MB, Jamieson, HE, Ardakani, OH, Gregory, BRB and Galloway, JM 2019 , 'Influence of late-Holocene climate change on the solid-phase speciation and long-term stability of arsenic in sub-Arctic lake sediments' , Science of The Total Environment, vol. 709 , pp. 1-18 , doi:10.1016/j.scitotenv.2019.136115 <http://dx.doi.org/10.1016/j.scitotenv.2019.136115>. |
op_doi |
https://doi.org/10.1016/j.scitotenv.2019.136115 |
container_title |
Science of The Total Environment |
container_volume |
709 |
container_start_page |
136115 |
_version_ |
1766299077627084800 |