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Retreat pattern of the Cordilleran Ice Sheet in central British Columbia at the end of the last glaciation reconstructed from glacial meltwater landforms

Margold, Martin, Jansson, Krister N., Kleman, Johan, Stroeven, Arjen P., Clague, John J.·2013·Boreas
DOI 10.1111/bor.12007
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Abstract

The C ordilleran I ce S heet (CIS) covered much of the mountainous northwestern part of N orth A merica at least several times during the P leistocene. The pattern and timing of its growth and decay are, however, poorly understood. Here, we present a reconstruction of the pattern of ice‐sheet retreat in central B ritish C olumbia at the end of the last glaciation based on a palaeoglaciological interpretation of ice‐marginal meltwater channels, eskers and deltas mapped from satellite imagery and digital elevation models. A consistent spatial pattern of high‐elevation (1600–2400 m a.s.l.), ice‐marginal meltwater channels is evident across central B ritish C olumbia. These landforms indicate the presence of ice domes over the S keena M ountains and the central C oast M ountains early during deglaciation. Ice sourced in the C oast M ountains remained dominant over the southern and east‐central parts of the I nterior P lateau during deglaciation. Our reconstruction shows a successive westward retreat of the ice margin from the western foot of the R ocky M ountains, accompanied by the formation and rapid evolution of a glacial lake in the upper F raser R iver basin. The final stage of deglaciation is characterized by the frontal retreat of ice lobes through the valleys of the S keena and O mineca M ountains and by the formation of large esker systems in the most prominent topographic lows of the I nterior P lateau. We conclude that the CIS underwent a large‐scale reconfiguration early during deglaciation and was subsequently diminished by thinning and complex frontal retreat towards the C oast M ountains.

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  • Retreat of the western ice margin may have been triggered by increased calving induced by eustatic sea-level rise and rapid deglacial isostatic adjustment.

    “The western ice margin was the only marine terminating section of the Cordilleran Ice Sheet, so retreat may have been triggered by increased calving induced by eustatic sea-level rise (Figure 4a) and rapid deglacial isostatic adjustment (Clague, 1985(Clague, , 1989;;Margold et al., 2013).”

    From Retreat of the Western Cordilleran Ice Sheet Margin During the Last Deglaciation (2018) · cites this paper as Margold et al., 2013

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Metadata

Authors
Margold, M., Jansson, K. N., Kleman, J., Stroeven, A. P., & Clague, J. J.
Affiliations
  • Department of Physical Geography and Quaternary Geology Stockholm University SE‐10691 Stockholm Sweden
  • Department of Earth Sciences Simon Fraser University 8888 University Drive Burnaby British Columbia Canada V5A 1S6
Venue
Boreas
Publisher
Wiley
Published
2013-02-18
Volume
42
Issue
4
Pages
830-847
ISSN
  • 0300-9483
  • 1502-3885
DOI
10.1111/bor.12007
Cited by
61
References
0
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)

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