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Structural glaciological maps can be used to study the structural evolution and past dynamics of glaciers. The map described here documents the glacier-wide structural characteristics of Austre Brøggerbreen, a c. 12 km2 predominantly cold-based valley glacier in northwest Svalbard. The structural map reveals that the glacier is dominated by deep-penetrating fractures that are now relict (crevasse traces). These structures indicate that, despite being relatively inactive at present, the glacier was once much more dynamic, presumably during its last advance in the Neoglacial (c. 1900 AD). Contemporary glacier structures (i.e. those that are actively forming) include primary stratification, longitudinal foliation and rare surface fracturing (crevasses and water-healed crevasses). Relict fracture sets become increasingly re-orientated and folded down-glacier as a result of ductile flow. Individual flow units show large differences in the evolution of structures, indicating that the flow units have been subject to different flow histories and dynamics. The map will also be useful for future change-detection studies on this rapidly receding glacier.
|Journal||Journal of Maps|
|Publication status||Published - 01 Sept 2015|
- structural glaciology
- Austre Brøggerbreen
- ice dynamics
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Origins of foliations and related phenomena in valley glaciers and ice sheetsAuthor: Jennings, S. J. A., 17 Feb 2017
Supervisor: Glasser, N. (Supervisor), Hubbard, B. (Supervisor) & Hambrey, M. (Supervisor)
Student thesis: Doctoral Thesis › Doctor of PhilosophyFile
- 1 Finished
Investigation into the structural characteristics of valley glacier foliations and subsequent comparison to large-scale ice sheet flowlines
Jennings, S. J. A.
03 Oct 2012 → 02 Apr 2016
Project: Externally funded research