Late Pleistocene yedoma in south-western Yukon (Canada): a remnant of Eastern Beringia?


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daniel.fortier [ at ] umontreal.ca

Abstract

Yedoma deposits developed from the syngenetic accumulation and freezing of organic-rich and ice-rich sediments during the Late Pleistocene over vast portions of Siberia, Alaska and Yukon Territory. Cryostratigraphic investigations revealed the presence of a yedoma deposit in the Beaver Creek area of south-western Yukon. The Beaver Creek area was not glaciated during the last glacial advance and the cryostratigraphic record comprises Middle Wisconsinian up to Holocene deposits covering the Mirror Creek disintegration moraine. Reworking of glacial deposits by alluvial and solifluction processes and peat accumulation in the depression of the hummocky moraine likely occurred during the Middle Wisconsinian period and was followed during the Late Wisconsinian by the yedoma build-up. A major thaw event interrupted the syngenetic permafrost aggradation which eventually resumed as attested by the upward growth of ice wedges.



Item Type
Conference (Talk)
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Primary Division
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Not peer-reviewed
Publication Status
Published
Event Details
5th European Conference on Permafrost, 23 Jun 2018 - 01 Jul 2018, Chamonix Mont-Blanc, France.
Eprint ID
47506
Cite as
Fortier, D. , Strauss, J. , Sliger, M. , Calmels, F. , Froese, D. and Shur, Y. (2018): Late Pleistocene yedoma in south-western Yukon (Canada): a remnant of Eastern Beringia? , 5th European Conference on Permafrost, Chamonix Mont-Blanc, France, 23 June 2018 - 1 July 2018 .


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