Distribution, characteristics and formation of esker enlargements

DEWALD, Nico, LEWINGTON, Emma, LIVINGSTONE, Stephen, CLARK, Chris and STORRAR, Robert (2021). Distribution, characteristics and formation of esker enlargements. Geomorphology, 392, p. 107919.

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Link to published version:: https://doi.org/10.1016/j.geomorph.2021.107919
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    Eskers are primarily ridges of glaciofluvial sediment deposited in subglacial, englacial and supraglacial conduits. They are typically straight to sinuous features, however, their planform morphology can be highly diverse. Esker enlargements are spatially confined ridge sections that are significantly wider than the trunk ridge (typically 250–400 m) and that reconverge downflow. The enlargements include complex ridge networks or coherent sediment bodies. We mapped >1400 esker enlargements across Fennoscandia and Keewatin, Canada, to investigate their distribution and morphological characteristics. Esker enlargements are less abundant below the marine limit, and tend to become more abundant in areas of faster ice retreat. They form local clusters along particular ridges, and can occasionally be traced laterally between adjacent esker systems. Based on morphological observations, we link their formation to roof collapses in subglacial conduits. The distribution of esker enlargements indicates that subglacial conduit collapse became an increasingly significant process during the final stages of deglaciation of both the Scandinavian and Laurentide ice sheets, and may have exerted a positive feedback on ice sheet retreat at land-terminating ice margins.

    Item Type: Article
    Uncontrolled Keywords: 0403 Geology; 0406 Physical Geography and Environmental Geoscience; Geography
    Identification Number: https://doi.org/10.1016/j.geomorph.2021.107919
    Page Range: p. 107919
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 03 Sep 2021 10:03
    Last Modified: 07 Sep 2021 16:00
    URI: http://shura.shu.ac.uk/id/eprint/28967

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