Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene
Nearly all of what is now British Columbia and adjacent areas were covered by an ice sheet at the maximum of the Last Glaciation (MIS 2) about 18,000 years ago. By 11,000 years ago, the Cordilleran Ice Sheet had disappeared, a victim of warming climate, eustatic sea-level rise along its western marg...
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Universidad de La Rioja
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ftunivriojaojs:oai:ojs.www.unirioja.es:article/3232 2024-10-13T14:08:05+00:00 Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene Deglaciación de la Cordillera Occidental de Canadá a finales del Pleistoceno Clague, J.J. 2017-09-15 application/pdf https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/3232 https://doi.org/10.18172/cig.3232 eng eng Universidad de La Rioja https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/3232/2907 https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/3232 doi:10.18172/cig.3232 Derechos de autor 2017 J.J. Clague Cuadernos de Investigación Geográfica; Vol. 43 No. 2 (2017); 449-466 Cuadernos de Investigación Geográfica; Vol. 43 Núm. 2 (2017); 449-466 1697-9540 0211-6820 10.18172/cig.vol43iss2 Deglaciation Cordilleran Ice Sheet British Columbia Yukon Territory Geochronology Deglaciación Manto de hielo de la Cordillera Columbia Británica Territorio del Yukón Geocronología info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2017 ftunivriojaojs https://doi.org/10.18172/cig.323210.18172/cig.vol43iss2 2024-09-18T23:40:51Z Nearly all of what is now British Columbia and adjacent areas were covered by an ice sheet at the maximum of the Last Glaciation (MIS 2) about 18,000 years ago. By 11,000 years ago, the Cordilleran Ice Sheet had disappeared, a victim of warming climate, eustatic sea-level rise along its western margin, and perhaps a reduction in precipitation. Deglaciation proceeded by frontal retreat at the periphery of the ice sheet and by downwasting, complex frontal retreat, and localized stagnation in its interior areas. The chronology of deglaciation is constrained, albeit with inherent dating errors, by AMS radiocarbon and 10Be surface exposure ages. High-elevation sites at the western margin of the British Columbia Interior Plateau, east of the Coast Mountains, became ice-free between about 15,000 and 12,000 years ago. Ice cover in the southern Coast Mountains was sufficiently extensive during the Younger Dryas Chronozone (12,900-11,700 years ago) that glaciers advanced into low-lying areas north and east of Vancouver. At the same time, however, a labyrinth of dead or dying tongues of glacier ice covered some interior valleys. By 11,000 years ago, ice cover in the Canadian Cordillera was no more extensive than it is today. Casi todo lo que hoy es Columbia Británica y áreas adyacentes estuvieron cubiertas por un manto de hielo durante el máximo de la Última Glaciación (MIS 2) hace unos 18.000 años. Hace unos 11.000 años el manto de hielo de la cordillera había desaparecido, víctima del calentamiento climático, el ascenso eustático del nivel del mar en su margen occidental, y quizás una reducción de la precipitación. La deglaciación se produjo por retroceso frontal en la periferia del manto de hielo y por desmantelamiento, retroceso frontal complejo, y estancamiento local en áreas del interior. La cronología de la deglaciación está bien definida, aunque con inherentes errores de datación, mediante radiocarbono por AMS y edades de exposición superficial mediante 10Be. Los lugares elevados en el margen occidental de la ... Article in Journal/Newspaper Ice Sheet Yukón Yukon Portal de Revistas de la Universidad de La Rioja British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Canada Hielo ENVELOPE(-58.133,-58.133,-62.083,-62.083) Labyrinth ENVELOPE(160.833,160.833,-77.550,-77.550) Periferia ENVELOPE(-64.977,-64.977,-68.403,-68.403) Yukon Cuadernos de Investigación Geográfica 43 2 449 466 |
institution |
Open Polar |
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Portal de Revistas de la Universidad de La Rioja |
op_collection_id |
ftunivriojaojs |
language |
English |
topic |
Deglaciation Cordilleran Ice Sheet British Columbia Yukon Territory Geochronology Deglaciación Manto de hielo de la Cordillera Columbia Británica Territorio del Yukón Geocronología |
spellingShingle |
Deglaciation Cordilleran Ice Sheet British Columbia Yukon Territory Geochronology Deglaciación Manto de hielo de la Cordillera Columbia Británica Territorio del Yukón Geocronología Clague, J.J. Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene |
topic_facet |
Deglaciation Cordilleran Ice Sheet British Columbia Yukon Territory Geochronology Deglaciación Manto de hielo de la Cordillera Columbia Británica Territorio del Yukón Geocronología |
description |
Nearly all of what is now British Columbia and adjacent areas were covered by an ice sheet at the maximum of the Last Glaciation (MIS 2) about 18,000 years ago. By 11,000 years ago, the Cordilleran Ice Sheet had disappeared, a victim of warming climate, eustatic sea-level rise along its western margin, and perhaps a reduction in precipitation. Deglaciation proceeded by frontal retreat at the periphery of the ice sheet and by downwasting, complex frontal retreat, and localized stagnation in its interior areas. The chronology of deglaciation is constrained, albeit with inherent dating errors, by AMS radiocarbon and 10Be surface exposure ages. High-elevation sites at the western margin of the British Columbia Interior Plateau, east of the Coast Mountains, became ice-free between about 15,000 and 12,000 years ago. Ice cover in the southern Coast Mountains was sufficiently extensive during the Younger Dryas Chronozone (12,900-11,700 years ago) that glaciers advanced into low-lying areas north and east of Vancouver. At the same time, however, a labyrinth of dead or dying tongues of glacier ice covered some interior valleys. By 11,000 years ago, ice cover in the Canadian Cordillera was no more extensive than it is today. Casi todo lo que hoy es Columbia Británica y áreas adyacentes estuvieron cubiertas por un manto de hielo durante el máximo de la Última Glaciación (MIS 2) hace unos 18.000 años. Hace unos 11.000 años el manto de hielo de la cordillera había desaparecido, víctima del calentamiento climático, el ascenso eustático del nivel del mar en su margen occidental, y quizás una reducción de la precipitación. La deglaciación se produjo por retroceso frontal en la periferia del manto de hielo y por desmantelamiento, retroceso frontal complejo, y estancamiento local en áreas del interior. La cronología de la deglaciación está bien definida, aunque con inherentes errores de datación, mediante radiocarbono por AMS y edades de exposición superficial mediante 10Be. Los lugares elevados en el margen occidental de la ... |
format |
Article in Journal/Newspaper |
author |
Clague, J.J. |
author_facet |
Clague, J.J. |
author_sort |
Clague, J.J. |
title |
Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene |
title_short |
Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene |
title_full |
Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene |
title_fullStr |
Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene |
title_full_unstemmed |
Deglaciation of the Cordillera of Western Canada at the end of the Pleistocene |
title_sort |
deglaciation of the cordillera of western canada at the end of the pleistocene |
publisher |
Universidad de La Rioja |
publishDate |
2017 |
url |
https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/3232 https://doi.org/10.18172/cig.3232 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) ENVELOPE(-58.133,-58.133,-62.083,-62.083) ENVELOPE(160.833,160.833,-77.550,-77.550) ENVELOPE(-64.977,-64.977,-68.403,-68.403) |
geographic |
British Columbia Canada Hielo Labyrinth Periferia Yukon |
geographic_facet |
British Columbia Canada Hielo Labyrinth Periferia Yukon |
genre |
Ice Sheet Yukón Yukon |
genre_facet |
Ice Sheet Yukón Yukon |
op_source |
Cuadernos de Investigación Geográfica; Vol. 43 No. 2 (2017); 449-466 Cuadernos de Investigación Geográfica; Vol. 43 Núm. 2 (2017); 449-466 1697-9540 0211-6820 10.18172/cig.vol43iss2 |
op_relation |
https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/3232/2907 https://publicaciones.unirioja.es/ojs/index.php/cig/article/view/3232 doi:10.18172/cig.3232 |
op_rights |
Derechos de autor 2017 J.J. Clague |
op_doi |
https://doi.org/10.18172/cig.323210.18172/cig.vol43iss2 |
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Cuadernos de Investigación Geográfica |
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43 |
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449 |
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