Change search
ReferencesLink to record
Permanent link

Direct link
The impact of glacial erosion on northern shields
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
University of St Andrews, UK.
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2012 (English)In: 42nd International Arcitc Workshop, Program and Abstracts 2012. Institute of Arctic and Alpine Research (INSTAAR), University of Colorado at Boulder, 115pp., 2012Conference paper, Presentation (Refereed)
Abstract [en]

The long-term geomorphic evolution of shield surfaces is poorly understood, especially of glaciated shields where saprolites and correlative sediments have been removed by glacial erosion. We know the rough picture of land uplift and erosional unloading during the Cenozoic and we know of the existence of stepped surfaces on the shield. However for further studies of the long term geomorphology of glaciated shields, we first need to assess the patterns and depth of glacial erosion on the shield bedrock landforms in order to reconstruct the preglacial land surface.

Large scale topography controls ice inception on that surface and influences ice dynamics during glaciation. Large-scale relief is a trigger for selective erosion and for ice streaming and bed materials affect the ice flow and the composition of tills. Yet the quantitative impact of glacial erosion on shield bedrock is barely known.

The patterns of erosion, deposition and redistribution of loose material on the shield surface are well known. The interesting question is if the bedrock surface of the northern shields only was the surface for redistribution, largely unaffected, or if the surface itself was modified and to what degree?

A detailed and convincing quantification of removal of bedrock by ice does not exist. Studies show that the ice erosional impact can be modest. However these are results of regional studies and wider studies of the northern shields are desirable, with the final aim of a quantification of the glacial erosional removal of bedrock for entire cratons.

Field investigations on the basis of identification of promising field localities in a digital elevation model (DEM), and in combination of GIS-analysis of combinations of the DEM with databases of bedrock geology and tectonics, are a new and powerful tool to identify patterns of glacial erosion over large areas and eventually to quantify the depths of glacial erosion on glaciated shield surfaces.

The presentation will show current results for northern Fennoscandia and future possibilities to assess patterns and quantities of glacial erosion in glaciated shield areas, with a focus on DEM-analysis.

Place, publisher, year, edition, pages
National Category
Physical Geography
URN: urn:nbn:se:su:diva-85230OAI: diva2:583038
42nd International Arctic Workshop Winter Park/Colorado/US
Available from: 2013-01-07 Created: 2013-01-07 Last updated: 2013-02-14Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Ebert, KarinKleman, Johan
By organisation
Department of Physical Geography and Quaternary Geology
Physical Geography

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 48 hits
ReferencesLink to record
Permanent link

Direct link