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| Titel |
Controls on the location and geometry of glacial overdeepening |
| VerfasserIn |
C. Lloyd, C. Clark, D. Swift |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250058441
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| Zusammenfassung |
| Overdeepening is an important glaciological and geomorphological process that has the
potential to influence the response of ice masses to climatic changes. We have examined
several hundred glacial overdeepenings in the Labrador Province of Canada to investigate the
controls on overdeepening location and geometry. Our analyses show that overdeepening
appears to correlate strongly with glacial confluence and, importantly, the correlation is
strongest where confluence-geometry indicates ice-flow speed-up. Further, we find that the
magnitude of ice-flow speed-up correlates with overdeepening depth only for confluences
situated in or near major geological fault-zones. Our findings therefore support the hypothesis
that overdeepening can be initiated by an increase in ice velocity. Further, we conclude that
overdeepening is most efficacious where fractured bedrock enables efficient quarrying. |
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