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Erosion of the Laurentide Region of North America by Glacial and Glaciofluvial Processes

Published online by Cambridge University Press:  20 January 2017

M. Bell  and
E. P. Laine
M. Bell
Affiliation:
Connecticut Geological and Natural History Survey, Department of Environmental Protection, Hartford, Connecticut 06106 USA
E. P. Laine
Affiliation:
Graduate School of Oceanography, University of Rhode Island, Kingston, Rhode Island 02881 USA
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Abstract

Collection of seismic reflection data from continental margins and ocean basins surrounding North America makes it possible to estimate the amount of material eroded from the area formerly covered by Laurentide ice sheets since major glaciation began in North America. A minimum estimate is made of 1.62 × 106 km3, or an average 120 m of rock physically eroded from the Laurentide region. This figure is an order of magnitude higher than earlier estimates based on the volume of glacial drift, Cenozoic marine sediments, and modern sediment loads of rivers. Most of the sediment produced during Laurentide glaciation has already been transported to the oceans. The importance of continental glaciation as a geomorphic agency in North America may have to be reevaluated. Evidence from sedimentation rates in ocean basins surrounding Greenland and Antarctica suggests that sediment production, sediment transport, and possibly denudation by permanent ice caps may be substantially lower than by periodic ice caps, such as the Laurentide. Low rates of sediment survival from the time of the Permo-Carboniferous and Precambrian glaciations suggest that predominance of marine deposition during some glacial epochs results in shorter lived sediment because of preferential tectonism and cycling of oceanic crust versus continental crust.

Type
Original Articles
Information
Quaternary Research , Volume 23 , Issue 2 , March 1985 , pp. 154 - 174
Copyright
University of Washington

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