LATE WISCONSIN GLACIATION OF HADWEN AND SUMMER ISLANDS, TUKTOYAKTUK COASTLANDS, NWT, CANADA

Julian Murton, Mark Bateman, Richard Waller, Colin Whiteman

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: John Ross MacKay Symposium - Permafrost I / Symposium John Ross MacKay - Pergélisol I

ABSTRACT: The exact timing of the last major advance of the Laurentide Ice Sheet onto the Beaufort Sea coastlands of western Arctic Canada is unclear but significant to our understanding of landscape change and palaeo-ice stream chronology. Optical stimulated luminescence dating of preglacial and postglacial aeolian sand from Hadwen and Summer islands, in the Tuktoyaktuk Coastlands, indicates that glaciation took place between about 17.5 and 15 ka, and most likely between 16.6 and 15.9 ka, coinciding with Heinrich event 1. At this time the Mackenzie Trough palaeo-ice stream advanced into a cold-climate sandy desert, interrupting aeolian activity.

RÉSUMÉ: La chronologie précise de la dernière grande avancée glaciaire de l'Inlandsis laurentidien sur le littoral de la mer de Beaufort dans l'ouest de l'Arctique canadien est incertaine, quoique importante pour la compréhension de la chronologie des paléo courants glaciaires et des changements survenus dans le paysage. La datation par luminescence optique stimulée de dépôts préglaciaires et de sable éolien postglaciaire prélevés sur les îles Hadwen et Summer, sur le littoral de Tuktoyaktuk, démontre que la glaciation aurait eu lieu entre 17,5 et 15 ka, et plus possiblement entre 16,6 et 15,9 ka, coïncidant avec l™évènement de Heinrich 1. Au cours de cette période, le climat dans la région du paléo courant glaciaire de la fosse du Mackenzie est devenu désertique et froid ce qui a interrompu l™activité éolienne.

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Cite this article:
Julian Murton; Mark Bateman; Richard Waller; Colin Whiteman (2015) LATE WISCONSIN GLACIATION OF HADWEN AND SUMMER ISLANDS, TUKTOYAKTUK COASTLANDS, NWT, CANADA in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.

@article{417,author = Julian Murton; Mark Bateman; Richard Waller; Colin Whiteman,title = LATE WISCONSIN GLACIATION OF HADWEN AND SUMMER ISLANDS, TUKTOYAKTUK COASTLANDS, NWT, CANADA,year = 2015}