New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments.
The Pingualuit Crater was formed by a meteoritic impact ca. 1.4 million years ago in northernmost Ungava (Canada). Due to its geographical position near the center of successive North American ice sheets and its favorable morphometry, the Pingualuit Crater Lake (water depth = 246 m) promises to yiel...
Published in: | Quaternary Science Reviews |
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2011
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Online Access: | https://espace.inrs.ca/id/eprint/10649/ https://doi.org/10.1016/j.quascirev.2011.10.002 |
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ftinrsquebec:oai:espace.inrs.ca:10649 2023-05-15T15:16:35+02:00 New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. Guyard, Hervé St-Onge, Guillaume Pienitz, Reinhard Francus, Pierre Zolitschka, Bernd Clarke, Garry K.C. Hausmann, Sonja Salonen, Veli-Pekka Lajeunesse, Patrick Ledoux, Grégoire Lamothe, Michel 2011 https://espace.inrs.ca/id/eprint/10649/ https://doi.org/10.1016/j.quascirev.2011.10.002 unknown Guyard, Hervé, St-Onge, Guillaume, Pienitz, Reinhard, Francus, Pierre, Zolitschka, Bernd, Clarke, Garry K.C., Hausmann, Sonja, Salonen, Veli-Pekka, Lajeunesse, Patrick, Ledoux, Grégoire et Lamothe, Michel (2011). New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. Quaternary Science Reviews , vol. 30 , nº 27-28. p. 3892-3907. DOI:10.1016/j.quascirev.2011.10.002 <https://doi.org/10.1016/j.quascirev.2011.10.002>. doi:10.1016/j.quascirev.2011.10.002 lacustrine sediments stratigraphy multiproxy late Pleistocene Ungava Crater Lake subglacial lake Article Évalué par les pairs 2011 ftinrsquebec https://doi.org/10.1016/j.quascirev.2011.10.002 2023-02-10T11:46:15Z The Pingualuit Crater was formed by a meteoritic impact ca. 1.4 million years ago in northernmost Ungava (Canada). Due to its geographical position near the center of successive North American ice sheets and its favorable morphometry, the Pingualuit Crater Lake (water depth = 246 m) promises to yield a unique continuous sedimentary sequence covering several glacial/interglacial cycles in the terrestrial Canadian Arctic. In this paper, we suggest the existence of a subglacial lake at least during the Last Glacial Maximum (LGM) by hydraulic potential modeling using LGM ice-surface elevation and bed topography derived from a digital elevation model. These results support the hypothesis that the bottom sediments of the Crater Lake escaped glacial erosion and may contain a long-term continental sedimentary sequence. We also present the stratigraphy of a 9 m-long core retrieved from the deep basin of the lake as well as a multiproxy reconstruction of its deglacial and postglacial history. The base of the core is formed by very dense diamicton reflecting basal melt-out environments marking the end of subglacial conditions at the coring site. The overlying finely laminated silt are related to the onset of proglacial conditions characterized by extremely low lacustrine productivity. Infra Red Stimulated Luminescence and AMS 14 C dating, as well as biostratigraphic data indicate sediment mixing between recent (e.g. Holocene) and much older (pre- to mid-Wisconsinan) material reworked by glacier activity. This process prevents the precise dating of these sediments that we interpret as being deposited just before the final deglaciation of the lake. Two finer grained and organic-rich intervals reflect the inception of lacustrine productivity resulting from the cessation of glacial meltwater inputs and ice-free periods. The lower organic interval corresponds to the early postglacial period (6850–5750 cal BP) and marks the transition between proglacial and postglacial conditions during the Holocene Thermal Maximum, while the ... Article in Journal/Newspaper Arctic glacier* Institut national de la recherche scientifique, Québec: Espace INRS Arctic Canada Crater Lake ENVELOPE(-60.667,-60.667,-62.983,-62.983) Quaternary Science Reviews 30 27-28 3892 3907 |
institution |
Open Polar |
collection |
Institut national de la recherche scientifique, Québec: Espace INRS |
op_collection_id |
ftinrsquebec |
language |
unknown |
topic |
lacustrine sediments stratigraphy multiproxy late Pleistocene Ungava Crater Lake subglacial lake |
spellingShingle |
lacustrine sediments stratigraphy multiproxy late Pleistocene Ungava Crater Lake subglacial lake Guyard, Hervé St-Onge, Guillaume Pienitz, Reinhard Francus, Pierre Zolitschka, Bernd Clarke, Garry K.C. Hausmann, Sonja Salonen, Veli-Pekka Lajeunesse, Patrick Ledoux, Grégoire Lamothe, Michel New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. |
topic_facet |
lacustrine sediments stratigraphy multiproxy late Pleistocene Ungava Crater Lake subglacial lake |
description |
The Pingualuit Crater was formed by a meteoritic impact ca. 1.4 million years ago in northernmost Ungava (Canada). Due to its geographical position near the center of successive North American ice sheets and its favorable morphometry, the Pingualuit Crater Lake (water depth = 246 m) promises to yield a unique continuous sedimentary sequence covering several glacial/interglacial cycles in the terrestrial Canadian Arctic. In this paper, we suggest the existence of a subglacial lake at least during the Last Glacial Maximum (LGM) by hydraulic potential modeling using LGM ice-surface elevation and bed topography derived from a digital elevation model. These results support the hypothesis that the bottom sediments of the Crater Lake escaped glacial erosion and may contain a long-term continental sedimentary sequence. We also present the stratigraphy of a 9 m-long core retrieved from the deep basin of the lake as well as a multiproxy reconstruction of its deglacial and postglacial history. The base of the core is formed by very dense diamicton reflecting basal melt-out environments marking the end of subglacial conditions at the coring site. The overlying finely laminated silt are related to the onset of proglacial conditions characterized by extremely low lacustrine productivity. Infra Red Stimulated Luminescence and AMS 14 C dating, as well as biostratigraphic data indicate sediment mixing between recent (e.g. Holocene) and much older (pre- to mid-Wisconsinan) material reworked by glacier activity. This process prevents the precise dating of these sediments that we interpret as being deposited just before the final deglaciation of the lake. Two finer grained and organic-rich intervals reflect the inception of lacustrine productivity resulting from the cessation of glacial meltwater inputs and ice-free periods. The lower organic interval corresponds to the early postglacial period (6850–5750 cal BP) and marks the transition between proglacial and postglacial conditions during the Holocene Thermal Maximum, while the ... |
format |
Article in Journal/Newspaper |
author |
Guyard, Hervé St-Onge, Guillaume Pienitz, Reinhard Francus, Pierre Zolitschka, Bernd Clarke, Garry K.C. Hausmann, Sonja Salonen, Veli-Pekka Lajeunesse, Patrick Ledoux, Grégoire Lamothe, Michel |
author_facet |
Guyard, Hervé St-Onge, Guillaume Pienitz, Reinhard Francus, Pierre Zolitschka, Bernd Clarke, Garry K.C. Hausmann, Sonja Salonen, Veli-Pekka Lajeunesse, Patrick Ledoux, Grégoire Lamothe, Michel |
author_sort |
Guyard, Hervé |
title |
New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. |
title_short |
New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. |
title_full |
New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. |
title_fullStr |
New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. |
title_full_unstemmed |
New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. |
title_sort |
new insights into late pleistocene glacial and postglacial history of northernmost ungava (canada) from pingualuit crater lake sediments. |
publishDate |
2011 |
url |
https://espace.inrs.ca/id/eprint/10649/ https://doi.org/10.1016/j.quascirev.2011.10.002 |
long_lat |
ENVELOPE(-60.667,-60.667,-62.983,-62.983) |
geographic |
Arctic Canada Crater Lake |
geographic_facet |
Arctic Canada Crater Lake |
genre |
Arctic glacier* |
genre_facet |
Arctic glacier* |
op_relation |
Guyard, Hervé, St-Onge, Guillaume, Pienitz, Reinhard, Francus, Pierre, Zolitschka, Bernd, Clarke, Garry K.C., Hausmann, Sonja, Salonen, Veli-Pekka, Lajeunesse, Patrick, Ledoux, Grégoire et Lamothe, Michel (2011). New insights into Late Pleistocene glacial and postglacial history of northernmost Ungava (Canada) from Pingualuit Crater Lake sediments. Quaternary Science Reviews , vol. 30 , nº 27-28. p. 3892-3907. DOI:10.1016/j.quascirev.2011.10.002 <https://doi.org/10.1016/j.quascirev.2011.10.002>. doi:10.1016/j.quascirev.2011.10.002 |
op_doi |
https://doi.org/10.1016/j.quascirev.2011.10.002 |
container_title |
Quaternary Science Reviews |
container_volume |
30 |
container_issue |
27-28 |
container_start_page |
3892 |
op_container_end_page |
3907 |
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1766346866210897920 |