Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence)
International audience Swath bathymetry data and seismic profiles collected in the NW Gulf of St Lawrence reveal a series of wedge-shaped depositional systems interpreted as grounding zone wedges (GZWs). Some segments of the GZWs change locally to form frontal moraines, or morainal banks, and subaqu...
Published in: | Geological Society, London, Special Publications |
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Online Access: | https://hal.science/hal-02365034 https://hal.science/hal-02365034/document https://hal.science/hal-02365034/file/Lajeunesse%20et%20al%202018%20GSL%20475.10.pdf https://doi.org/10.1144/SP475.10 |
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ftunivrennes2hal:oai:HAL:hal-02365034v1 2024-02-11T10:04:51+01:00 Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence) Lajeunesse, P. Dietrich, Pierre Ghienne, J.-F Université Laval Québec (ULaval) University of Johannesburg South Africa (UJ) Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2019 https://hal.science/hal-02365034 https://hal.science/hal-02365034/document https://hal.science/hal-02365034/file/Lajeunesse%20et%20al%202018%20GSL%20475.10.pdf https://doi.org/10.1144/SP475.10 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.1144/SP475.10 hal-02365034 https://hal.science/hal-02365034 https://hal.science/hal-02365034/document https://hal.science/hal-02365034/file/Lajeunesse%20et%20al%202018%20GSL%20475.10.pdf doi:10.1144/SP475.10 info:eu-repo/semantics/OpenAccess Geological Society Special Publication https://hal.science/hal-02365034 Geological Society Special Publication, 2019, 475 (1), pp.241-259. ⟨10.1144/SP475.10⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy info:eu-repo/semantics/article Journal articles 2019 ftunivrennes2hal https://doi.org/10.1144/SP475.10 2024-01-23T23:50:18Z International audience Swath bathymetry data and seismic profiles collected in the NW Gulf of St Lawrence reveal a series of wedge-shaped depositional systems interpreted as grounding zone wedges (GZWs). Some segments of the GZWs change locally to form frontal moraines, or morainal banks, and subaqueous ice-contact fans, reflecting changes in either the nature of the ice margin or the rate of sediment input. These grounding zones (GZ) of the ice margin extend laterally along three isobaths at depths of 180 (GZ1), 120 (GZ2) and 80 (GZ3) m (±20 m) along the Québec North Shore shelf, the 120 m-deep GZ2 system being traceable over a distance of >300 km. Associated GZWs can occur in three geometries along a same isobath system: curvilinear, lobate and shelf-break. GZ systems were built during three distinct stages of stabilization of the marine-based southeastern margin of the Laurentide Ice Sheet following its rapid retreat across the deeper waters of the Laurentian Channel in the Gulf of St Lawrence after 14.8 cal ka BP. The occurrence of GZ along distinct isobaths indicates that bathymetry exerted a strong control on ice stabilization during deglaciation by reducing the relative water depth at the ice margin and thereby the buoyancy and rate of iceberg calving. However, fluctuations and re-advances of the ice margin are also recorded by the overprinting of a portion of the GZ2 system by the younger GZ3 system, potentially suggesting an additional response to climate-driven forcing. Article in Journal/Newspaper Ice Sheet Archive Ouverte de l'Université Rennes (HAL) Geological Society, London, Special Publications 475 1 241 259 |
institution |
Open Polar |
collection |
Archive Ouverte de l'Université Rennes (HAL) |
op_collection_id |
ftunivrennes2hal |
language |
English |
topic |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
spellingShingle |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy Lajeunesse, P. Dietrich, Pierre Ghienne, J.-F Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence) |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy |
description |
International audience Swath bathymetry data and seismic profiles collected in the NW Gulf of St Lawrence reveal a series of wedge-shaped depositional systems interpreted as grounding zone wedges (GZWs). Some segments of the GZWs change locally to form frontal moraines, or morainal banks, and subaqueous ice-contact fans, reflecting changes in either the nature of the ice margin or the rate of sediment input. These grounding zones (GZ) of the ice margin extend laterally along three isobaths at depths of 180 (GZ1), 120 (GZ2) and 80 (GZ3) m (±20 m) along the Québec North Shore shelf, the 120 m-deep GZ2 system being traceable over a distance of >300 km. Associated GZWs can occur in three geometries along a same isobath system: curvilinear, lobate and shelf-break. GZ systems were built during three distinct stages of stabilization of the marine-based southeastern margin of the Laurentide Ice Sheet following its rapid retreat across the deeper waters of the Laurentian Channel in the Gulf of St Lawrence after 14.8 cal ka BP. The occurrence of GZ along distinct isobaths indicates that bathymetry exerted a strong control on ice stabilization during deglaciation by reducing the relative water depth at the ice margin and thereby the buoyancy and rate of iceberg calving. However, fluctuations and re-advances of the ice margin are also recorded by the overprinting of a portion of the GZ2 system by the younger GZ3 system, potentially suggesting an additional response to climate-driven forcing. |
author2 |
Université Laval Québec (ULaval) University of Johannesburg South Africa (UJ) Géosciences Rennes (GR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR) Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS) Institut de physique du globe de Strasbourg (IPGS) Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Lajeunesse, P. Dietrich, Pierre Ghienne, J.-F |
author_facet |
Lajeunesse, P. Dietrich, Pierre Ghienne, J.-F |
author_sort |
Lajeunesse, P. |
title |
Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence) |
title_short |
Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence) |
title_full |
Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence) |
title_fullStr |
Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence) |
title_full_unstemmed |
Late Wisconsinan grounding zones of the Laurentide Ice Sheet margin off the Québec North Shore (NW Gulf of St Lawrence) |
title_sort |
late wisconsinan grounding zones of the laurentide ice sheet margin off the québec north shore (nw gulf of st lawrence) |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02365034 https://hal.science/hal-02365034/document https://hal.science/hal-02365034/file/Lajeunesse%20et%20al%202018%20GSL%20475.10.pdf https://doi.org/10.1144/SP475.10 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geological Society Special Publication https://hal.science/hal-02365034 Geological Society Special Publication, 2019, 475 (1), pp.241-259. ⟨10.1144/SP475.10⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1144/SP475.10 hal-02365034 https://hal.science/hal-02365034 https://hal.science/hal-02365034/document https://hal.science/hal-02365034/file/Lajeunesse%20et%20al%202018%20GSL%20475.10.pdf doi:10.1144/SP475.10 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1144/SP475.10 |
container_title |
Geological Society, London, Special Publications |
container_volume |
475 |
container_issue |
1 |
container_start_page |
241 |
op_container_end_page |
259 |
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1790601610263527424 |