Ice Fabrics and Petrography, Meserve Glacier, Antarctica
Results of petrographic and fabric analysis of fine-grained cold ice from the tongue of Meserve Glacier, Antarctica, are described. Most of the basal ice is remarkably uniform in texture and shows an optic-axis fabric with a single strong maximum, which is consistent with the steady-state conditions...
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Language: | English |
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Cambridge University Press (CUP)
1974
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Online Access: | http://dx.doi.org/10.1017/s0022143000023091 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000023091 |
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crcambridgeupr:10.1017/s0022143000023091 2024-03-03T08:38:26+00:00 Ice Fabrics and Petrography, Meserve Glacier, Antarctica Anderton, P.W. 1974 http://dx.doi.org/10.1017/s0022143000023091 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000023091 en eng Cambridge University Press (CUP) Journal of Glaciology volume 13, issue 68, page 285-306 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1974 crcambridgeupr https://doi.org/10.1017/s0022143000023091 2024-02-08T08:34:04Z Results of petrographic and fabric analysis of fine-grained cold ice from the tongue of Meserve Glacier, Antarctica, are described. Most of the basal ice is remarkably uniform in texture and shows an optic-axis fabric with a single strong maximum, which is consistent with the steady-state conditions of flow. Within 0.5 m of the ice–rock interface, irregularities in the bed cause flow perturbations which are correlated with recrystallization and changes in fabric of the ice. Optic-axis fabrics in the basal ice show close symmetry relationships with dimensional fabric and deformation symmetry. Grain-size of the ice increases towards the surface of the glacier and the single maximum of the optic-axis fabric undergoes a rotation about the flow vector. In the near surface, where strain-rates are relatively much lower, the optic-axis fabric symmetry is not closely related to either deformation symmetry or the dimensional fabric. Syntectonic recrystallization of ice throughout the glacier tongue characteristically produces a strong single-maximum fabric, the orientation of which in relation to the stress field is apparently determined by stress level. Under steady-state conditions of flow, the strength of the maximum also appears to be a function of stress level. Article in Journal/Newspaper Antarc* Antarctica Journal of Glaciology Cambridge University Press Meserve Glacier ENVELOPE(162.283,162.283,-77.517,-77.517) Journal of Glaciology 13 68 285 306 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Anderton, P.W. Ice Fabrics and Petrography, Meserve Glacier, Antarctica |
topic_facet |
Earth-Surface Processes |
description |
Results of petrographic and fabric analysis of fine-grained cold ice from the tongue of Meserve Glacier, Antarctica, are described. Most of the basal ice is remarkably uniform in texture and shows an optic-axis fabric with a single strong maximum, which is consistent with the steady-state conditions of flow. Within 0.5 m of the ice–rock interface, irregularities in the bed cause flow perturbations which are correlated with recrystallization and changes in fabric of the ice. Optic-axis fabrics in the basal ice show close symmetry relationships with dimensional fabric and deformation symmetry. Grain-size of the ice increases towards the surface of the glacier and the single maximum of the optic-axis fabric undergoes a rotation about the flow vector. In the near surface, where strain-rates are relatively much lower, the optic-axis fabric symmetry is not closely related to either deformation symmetry or the dimensional fabric. Syntectonic recrystallization of ice throughout the glacier tongue characteristically produces a strong single-maximum fabric, the orientation of which in relation to the stress field is apparently determined by stress level. Under steady-state conditions of flow, the strength of the maximum also appears to be a function of stress level. |
format |
Article in Journal/Newspaper |
author |
Anderton, P.W. |
author_facet |
Anderton, P.W. |
author_sort |
Anderton, P.W. |
title |
Ice Fabrics and Petrography, Meserve Glacier, Antarctica |
title_short |
Ice Fabrics and Petrography, Meserve Glacier, Antarctica |
title_full |
Ice Fabrics and Petrography, Meserve Glacier, Antarctica |
title_fullStr |
Ice Fabrics and Petrography, Meserve Glacier, Antarctica |
title_full_unstemmed |
Ice Fabrics and Petrography, Meserve Glacier, Antarctica |
title_sort |
ice fabrics and petrography, meserve glacier, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1974 |
url |
http://dx.doi.org/10.1017/s0022143000023091 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000023091 |
long_lat |
ENVELOPE(162.283,162.283,-77.517,-77.517) |
geographic |
Meserve Glacier |
geographic_facet |
Meserve Glacier |
genre |
Antarc* Antarctica Journal of Glaciology |
genre_facet |
Antarc* Antarctica Journal of Glaciology |
op_source |
Journal of Glaciology volume 13, issue 68, page 285-306 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000023091 |
container_title |
Journal of Glaciology |
container_volume |
13 |
container_issue |
68 |
container_start_page |
285 |
op_container_end_page |
306 |
_version_ |
1792506824286535680 |