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Lookup NU author(s): Dr Matthew Burke,
Professor Andrew RussellORCiD
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We present ground-penetrating radar (GPR) profiles that reveal the sedimentary architecture of an esker deposited during a surge-associated outburst flood at the Bering Glacier, Alaska. The wide, upflow end of the esker contains a transition from large backset beds to large foreset beds interpreted to reflect composite macroform development in an enlarged part of the conduit. By contrast, the narrow, downflow portion of the esker is dominated by plane beds interpreted to have been deposited where the conduit was constricted and the flow was faster. A previously studied outburst esker at Skeiðarárjökull, Iceland, has a similar morphology and stratigraphic architecture. This suggests that outburst floods generate distinct depositional signatures in eskers, both in terms of morphology and sedimentary architecture. Identification of these distinct signatures in ancient eskers will help assess the paleohydraulic conditions under which ancient eskers formed and, by extension, the nature of meltwater drainage systems beneath the Laurentide and Eurasian ice sheets.
Author(s): Burke MJ, Woodward J, Russell AJ, Fleisher PJ, Bailey PK
Publication type: Article
Publication status: Published
Journal: Geological Society of America Bulletin
Print publication date: 10/05/2010
ISSN (print): 0016-7606
ISSN (electronic): 1943-2674
Publisher: Geological Society of America
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