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Meteoric and marine ice crystal orientation fabrics from the Amery Ice Shelf, East Antarctica
Citation
Treverrow, A and Warner, RC and Budd, WF and Craven, M, Meteoric and marine ice crystal orientation fabrics from the Amery Ice Shelf, East Antarctica, Journal of Glaciology, 56, (199) pp. 877-890. ISSN 0022-1430 (2010) [Refereed Article]
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Copyright Statement
Copyright © 2010 IGS
Official URL: http://www.igsoc.org/
DOI: doi:10.3189/002214310794457353
Abstract
The northwestern sector of the Amery Ice Shelf, East Antarctica, has a layered structure,due to the presence of both meteoric ice and a marine ice layer resulting from sub-shelf freezing processes. Crystal orientation fabric and grain-size data are presented for ice cores obtained from two boreholes $70 km apart on approximately the same flowline. Multiple-maxima crystal orientation fabrics and large mean grain sizes in the meteoric ice are indicative of stress relaxation and subsequent grain growth in ice that has flowed into the Amery Ice Shelf. Strongly anisotropic single-maximum crystal orientation fabrics and rectangular textures near the base of the $200 m thick marine ice layer suggest accretion occurs by the accumulation of frazil ice platelets. Crystal orientation fabrics in older marine ice exhibit vertical large circle girdle patterns, influenced by the complex stress configurations that exist towards the margins of the ice shelf. Post-accumulation grain growth and fabric development in the marine ice layer are restricted by a high concentration of brine and insoluble particulate inclusions. Differences in the meteoric and marine ice crystallography are indicative of the contrasting rheological properties of these layers, which must be considered in relation to large-scale ice-shelf dynamics.
Item Details
Item Type: | Refereed Article |
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Research Division: | Earth Sciences |
Research Group: | Physical Geography and Environmental Geoscience |
Research Field: | Glaciology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding Knowledge |
Objective Field: | Expanding Knowledge in the Earth Sciences |
UTAS Author: | Treverrow, A (Dr Adam Treverrow) |
UTAS Author: | Warner, RC (Dr Roland Warner) |
UTAS Author: | Budd, WF (Professor William Budd) |
UTAS Author: | Craven, M (Mr Mike Craven) |
ID Code: | 68153 |
Year Published: | 2010 |
Web of Science® Times Cited: | 13 |
Deposited By: | IMAS Research and Education Centre |
Deposited On: | 2011-03-09 |
Last Modified: | 2011-05-22 |
Downloads: | 521 View Download Statistics |
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