Post-LGM sedimentation history and deglaciation processes in the southern Gulf of St. Lawrence, Canada
Rattachement africain : ca, it, de, us, dk. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
During the last glacial period, continents and surrounding shelves in high latitude regions of the Northern Hemisphere were covered by ice sheets. Their retreat after the Last Glacial Maximum resulted in isostatic adjustments of the previously glaciated landmass and post-glacial changes in relative sea level during the late Pleistocene and Holocene. Many questions, however, remain about the timing and impact of the ice retreat and of short-lived climatic events on continental shelf environments. This study aims to reconstruct the sedimentation and deglaciation processes on the continental shelf of the southern Gulf of St. Lawrence (Canada) over the past 14 ka by investigating changes in the sedimentation patterns and paleo-environments. Using information from sub-bottom profiles, sediment cores, and multibeam bathymetry, this study finds that most of the continental shelf was flooded 13.6 ka ago, as evidenced by the presence of Bølling-Allerød marine sediments at a water depth of ∼50 m and ∼15 km off the modern coastline, which also suggests an earlier retreat of the Laurentide Ice Sheet than suggested by previous studies. We estimate sedimentation rates for the Bølling-Allerød of ∼0.4 cm a −1 , which increased up to 1 cm a −1 during the Younger Dryas cooling event, likely associated with increased storm-wave activity and sea ice development caused by deteriorating climatic conditions. The presence of an erosional truncation atop Younger Dryas sediments indicates a late Pleistocene-early Holocene relative sea level fall and associated lowstand. Based on our new data, we established a geological model that highlights sedimentation processes since the Last Glacial Maximum and demonstrate the potential impact of short-lived climatic events on the former ice margin during deglaciation. • Significant influence of the Bølling-Allerød and Younger Dryas on sedimentation. • Buried sediment basins and channels filled by late Pleistocene sediments. • Sedimentation rates >0.4 cm a −1 during deglaciation. • Erosional truncation possibly related to the Holocene RSL lowstand. • Marine sedimentation close to the coast of PEI as early as ∼13.6 ka BP.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Post-LGM sedimentation history and deglaciation processes in the southern Gulf of St. Lawrence, Canada
- Date Crossref
- 01/01/2026
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Dalhousie University Department of Earth and Environmental Sciences pays non établi dans la noticeUniversité ou école supérieure
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University of Modena and Reggio Emilia Department of Chemical and Geological Sciences pays non établi dans la noticeUniversité ou école supérieure
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Geological Survey of Canada pays non établi dans la noticeOrganisme public
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GEOMAR Helmholtz Centre for Ocean Research Kiel pays non établi dans la noticeStructure de recherche
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Helmholtz Centre for Environmental Research Department Hydrogeology pays non établi dans la noticeStructure de recherche
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Istituto di Scienze Marine del Consiglio Nazionale delle Ricerche pays non établi dans la noticeStructure de recherche
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Institute of Structure of Matter pays non établi dans la noticeStructure de recherche
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Monterey Bay Aquarium Research Institute pays non établi dans la noticeOrganisation à but non lucratif
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Aarhus University Department of Geoscience pays non établi dans la noticeUniversité ou école supérieure
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Memorial University of Newfoundland Fisheries and Marine Institute pays non établi dans la noticeUniversité ou école supérieure
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Centre for Water Resources Studies pays non établi dans la noticeUniversité ou école supérieure
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Natural Resources Canada (NRCan) pays non établi dans la noticeInstitution
Department of Earth and Environmental Sciences — Dalhousie University, Department of Chemical and Geological Sciences — University of Modena and Reggio Emilia et Geological Survey of Canada, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.