Sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern Champlain Sea basin)
The nature of glaciomarine sediments deposited during ice margin retreat can vary according to physiographic setting and relative sea level fluctuations. To understand the effects of these two parameters on sedimentation, we analyzed the sediment records of four lakes located within former isolated...
Published in: | Canadian Journal of Earth Sciences |
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crcansciencepubl:10.1139/cjes-2017-0002 2024-09-15T18:35:31+00:00 Sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern Champlain Sea basin) Normandeau, Alexandre Lajeunesse, Patrick Trottier, Annie-Pier Poiré, Antoine G. Pienitz, Reinhard 2017 http://dx.doi.org/10.1139/cjes-2017-0002 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2017-0002 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2017-0002 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 54, issue 10, page 1049-1062 ISSN 0008-4077 1480-3313 journal-article 2017 crcansciencepubl https://doi.org/10.1139/cjes-2017-0002 2024-06-27T04:11:00Z The nature of glaciomarine sediments deposited during ice margin retreat can vary according to physiographic setting and relative sea level fluctuations. To understand the effects of these two parameters on sedimentation, we analyzed the sediment records of four lakes located within former isolated glaciomarine embayments of the northern Champlain Sea basin. These lakes were initially inundated by marine water of the Champlain Sea, following deglaciation, and have subsequently experienced basin isolation owing to glacio-isostatic rebound. Three of these lakes reveal a common litho- and acoustic stratigraphic succession, characterized by an IRD-free glaciomarine to marine facies consisting of homogeneous to faintly laminated clayey silts grading into well-laminated silts with rapidly deposited layers. These two units recorded the transitional environment from glaciomarine sedimentation below multiyear shorefast ice to increased terrestrial runoff and rapid glacio-isostatic rebound once the ice margin retreated inland. During ice margin retreat, relative sea level fell concomitantly resulting in the deposition of coarser sediments in marine embayments. Upon the complete retreat of the ice margin, the supply of terrestrial sediments diminished and lake isolation, driven by relative sea level fall, led to higher biogenic content and increased bioturbation. This study provides a framework for sedimentation in isolated glaciomarine embayments which differs from deep-water sedimentation owing to the presence of shorefast sea-ice and their protected location from major ice-stream outlets. Article in Journal/Newspaper Sea ice Canadian Science Publishing Canadian Journal of Earth Sciences 54 10 1049 1062 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
The nature of glaciomarine sediments deposited during ice margin retreat can vary according to physiographic setting and relative sea level fluctuations. To understand the effects of these two parameters on sedimentation, we analyzed the sediment records of four lakes located within former isolated glaciomarine embayments of the northern Champlain Sea basin. These lakes were initially inundated by marine water of the Champlain Sea, following deglaciation, and have subsequently experienced basin isolation owing to glacio-isostatic rebound. Three of these lakes reveal a common litho- and acoustic stratigraphic succession, characterized by an IRD-free glaciomarine to marine facies consisting of homogeneous to faintly laminated clayey silts grading into well-laminated silts with rapidly deposited layers. These two units recorded the transitional environment from glaciomarine sedimentation below multiyear shorefast ice to increased terrestrial runoff and rapid glacio-isostatic rebound once the ice margin retreated inland. During ice margin retreat, relative sea level fell concomitantly resulting in the deposition of coarser sediments in marine embayments. Upon the complete retreat of the ice margin, the supply of terrestrial sediments diminished and lake isolation, driven by relative sea level fall, led to higher biogenic content and increased bioturbation. This study provides a framework for sedimentation in isolated glaciomarine embayments which differs from deep-water sedimentation owing to the presence of shorefast sea-ice and their protected location from major ice-stream outlets. |
format |
Article in Journal/Newspaper |
author |
Normandeau, Alexandre Lajeunesse, Patrick Trottier, Annie-Pier Poiré, Antoine G. Pienitz, Reinhard |
spellingShingle |
Normandeau, Alexandre Lajeunesse, Patrick Trottier, Annie-Pier Poiré, Antoine G. Pienitz, Reinhard Sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern Champlain Sea basin) |
author_facet |
Normandeau, Alexandre Lajeunesse, Patrick Trottier, Annie-Pier Poiré, Antoine G. Pienitz, Reinhard |
author_sort |
Normandeau, Alexandre |
title |
Sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern Champlain Sea basin) |
title_short |
Sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern Champlain Sea basin) |
title_full |
Sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern Champlain Sea basin) |
title_fullStr |
Sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern Champlain Sea basin) |
title_full_unstemmed |
Sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern Champlain Sea basin) |
title_sort |
sedimentation in isolated glaciomarine embayments during glacio-isostatically induced relative sea level fall (northern champlain sea basin) |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
http://dx.doi.org/10.1139/cjes-2017-0002 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjes-2017-0002 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2017-0002 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Canadian Journal of Earth Sciences volume 54, issue 10, page 1049-1062 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjes-2017-0002 |
container_title |
Canadian Journal of Earth Sciences |
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54 |
container_issue |
10 |
container_start_page |
1049 |
op_container_end_page |
1062 |
_version_ |
1810478701898366976 |