High-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in Lac Guillaume-Delisle Estuary and Nastapoka Sound, eastern Hudson Bay
Lac Guillaume-Delisle Estuary and Nastapoka Sound are two sedimentary basins that recorded the late Quaternary deglaciation on the eastern coast of Hudson Bay. Acoustic profiles reveal an average sediments thickness of 15 m in the estuary and 6 m in the sound. These sediments reach 70 m thick in dee...
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crcansciencepubl:10.1139/e08-010 2023-12-17T10:31:23+01:00 High-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in Lac Guillaume-Delisle Estuary and Nastapoka Sound, eastern Hudson Bay Lavoie, Caroline Hill, Philip R. Allard, Michel St-Onge, Guillaume Lajeunesse, Patrick Hillaire-Marcel, C. 2008 http://dx.doi.org/10.1139/e08-010 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-010 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-010 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 45, issue 4, page 427-441 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 2008 crcansciencepubl https://doi.org/10.1139/e08-010 2023-11-19T13:39:32Z Lac Guillaume-Delisle Estuary and Nastapoka Sound are two sedimentary basins that recorded the late Quaternary deglaciation on the eastern coast of Hudson Bay. Acoustic profiles reveal an average sediments thickness of 15 m in the estuary and 6 m in the sound. These sediments reach 70 m thick in deep glacial troughs. Within the studied basins, four seismo-stratigraphic units overlying the acoustic basement were recognized. Unit 1 (subaqueous ice-contact and draped glaciomarine deposits associated with the Quebec–Labrador Ice Sector (QLIS) of the Laurentide Ice Sheet (LIS) and the Tyrrell Sea) records the presence of a short ice-marginal stillstand during glacial retreat. Unit 2 (paraglacial and postglacial fluvial-deltaic deposits) and unit 3 (postglacial silty deposits) result from erosion of emerged sediments and redeposition in response to changes in relative sea level (RSL). Finally, unit 4 is composed of deformed deposits associated with a mass wasting event. The stratigraphic sequence and the spatial distribution patterns of deposits show that Lac Guillaume-Delisle is a good model to explain the dynamics of the QLIS margin during and after successive ice stillstands, continuous RSL fall, river discharge (ablation on land), and its final ablation inland. Additionally, seven cores were sampled in the southeast part of the estuary. Geochemical (organic carbon and total nitrogen) and carbon isotopic contents, used as alternative proxy, indicate that the sampled sediments correspond to the postglacial estuarine deposits of unit 3. Allochthonous sources of carbon dominate the supply to the sediments where the environment is regularly flushed by fresh and marine waters. Article in Journal/Newspaper Hudson Bay Ice Sheet Nastapoka Canadian Science Publishing (via Crossref) Hudson Bay Hudson Guillaume ENVELOPE(70.150,70.150,-49.350,-49.350) Tyrrell ENVELOPE(-69.512,-69.512,-69.634,-69.634) Lac Guillaume-Delisle ENVELOPE(-76.294,-76.294,56.249,56.249) Nastapoka Sound ENVELOPE(-76.549,-76.549,56.884,56.884) Canadian Journal of Earth Sciences 45 4 427 441 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
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English |
topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Lavoie, Caroline Hill, Philip R. Allard, Michel St-Onge, Guillaume Lajeunesse, Patrick High-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in Lac Guillaume-Delisle Estuary and Nastapoka Sound, eastern Hudson Bay |
topic_facet |
General Earth and Planetary Sciences |
description |
Lac Guillaume-Delisle Estuary and Nastapoka Sound are two sedimentary basins that recorded the late Quaternary deglaciation on the eastern coast of Hudson Bay. Acoustic profiles reveal an average sediments thickness of 15 m in the estuary and 6 m in the sound. These sediments reach 70 m thick in deep glacial troughs. Within the studied basins, four seismo-stratigraphic units overlying the acoustic basement were recognized. Unit 1 (subaqueous ice-contact and draped glaciomarine deposits associated with the Quebec–Labrador Ice Sector (QLIS) of the Laurentide Ice Sheet (LIS) and the Tyrrell Sea) records the presence of a short ice-marginal stillstand during glacial retreat. Unit 2 (paraglacial and postglacial fluvial-deltaic deposits) and unit 3 (postglacial silty deposits) result from erosion of emerged sediments and redeposition in response to changes in relative sea level (RSL). Finally, unit 4 is composed of deformed deposits associated with a mass wasting event. The stratigraphic sequence and the spatial distribution patterns of deposits show that Lac Guillaume-Delisle is a good model to explain the dynamics of the QLIS margin during and after successive ice stillstands, continuous RSL fall, river discharge (ablation on land), and its final ablation inland. Additionally, seven cores were sampled in the southeast part of the estuary. Geochemical (organic carbon and total nitrogen) and carbon isotopic contents, used as alternative proxy, indicate that the sampled sediments correspond to the postglacial estuarine deposits of unit 3. Allochthonous sources of carbon dominate the supply to the sediments where the environment is regularly flushed by fresh and marine waters. |
author2 |
Hillaire-Marcel, C. |
format |
Article in Journal/Newspaper |
author |
Lavoie, Caroline Hill, Philip R. Allard, Michel St-Onge, Guillaume Lajeunesse, Patrick |
author_facet |
Lavoie, Caroline Hill, Philip R. Allard, Michel St-Onge, Guillaume Lajeunesse, Patrick |
author_sort |
Lavoie, Caroline |
title |
High-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in Lac Guillaume-Delisle Estuary and Nastapoka Sound, eastern Hudson Bay |
title_short |
High-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in Lac Guillaume-Delisle Estuary and Nastapoka Sound, eastern Hudson Bay |
title_full |
High-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in Lac Guillaume-Delisle Estuary and Nastapoka Sound, eastern Hudson Bay |
title_fullStr |
High-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in Lac Guillaume-Delisle Estuary and Nastapoka Sound, eastern Hudson Bay |
title_full_unstemmed |
High-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in Lac Guillaume-Delisle Estuary and Nastapoka Sound, eastern Hudson Bay |
title_sort |
high-resolution seismo-stratigraphy and sedimentological properties of late- and postglacial sediments in lac guillaume-delisle estuary and nastapoka sound, eastern hudson bay |
publisher |
Canadian Science Publishing |
publishDate |
2008 |
url |
http://dx.doi.org/10.1139/e08-010 http://www.nrcresearchpress.com/doi/full-xml/10.1139/E08-010 http://www.nrcresearchpress.com/doi/pdf/10.1139/E08-010 |
long_lat |
ENVELOPE(70.150,70.150,-49.350,-49.350) ENVELOPE(-69.512,-69.512,-69.634,-69.634) ENVELOPE(-76.294,-76.294,56.249,56.249) ENVELOPE(-76.549,-76.549,56.884,56.884) |
geographic |
Hudson Bay Hudson Guillaume Tyrrell Lac Guillaume-Delisle Nastapoka Sound |
geographic_facet |
Hudson Bay Hudson Guillaume Tyrrell Lac Guillaume-Delisle Nastapoka Sound |
genre |
Hudson Bay Ice Sheet Nastapoka |
genre_facet |
Hudson Bay Ice Sheet Nastapoka |
op_source |
Canadian Journal of Earth Sciences volume 45, issue 4, page 427-441 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e08-010 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
45 |
container_issue |
4 |
container_start_page |
427 |
op_container_end_page |
441 |
_version_ |
1785584683887624192 |