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Pliocene-Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation

Benjamin A. Keisling, Lisbeth T. Nielsen, Christine S. Hvidberg, Roman Nuterman and Robert M. DeConto
Pliocene-Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation
Geology (Boulder) (April 2020) 48 (7): 737-741

Abstract

The Greenland ice sheet (GrIS) covers a complex network of canyons thought to be preglacial and fluvial in origin, implying that these features have influenced the ice sheet since its inception. The largest of these canyons terminates in northwest Greenland at the outlet of the Petermann Glacier. Yet, the genesis of this canyon, and similar features in northern Greenland, remains unknown. Here, we present numerical model simulations of early GrIS history and show that interactions among climate, the growing ice sheet, and preexisting topography may have contributed to the excavation of the canyon via repeated catastrophic outburst floods. Our results have implications for interpreting sedimentary and geomorphic features beneath the GrIS and around its marine margins, and they document a novel mechanism for landscape erosion in Greenland.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 48
Serial Issue: 7
Title: Pliocene-Pleistocene megafloods as a mechanism for Greenlandic megacanyon formation
Affiliation: University of Massachusetts-Amherst, Department of Geosciences, Climate System Research Center, Amherst, MA, United States
Pages: 737-741
Published: 20200429
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 35
Accession Number: 2021-011274
Categories: Geomorphology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N70°27'30" - N70°27'30", W64°39'24" - W64°39'24"
Secondary Affiliation: University of Copenhagen, DNK, Denmark
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 202108
Program Name: ODPOcean Drilling Program
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