Crystallographic preferred orientation (CPO) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data
Abstract Strain, temperature and strain rate are crucial factors governing the development of crystallographic preferred orientations (CPO) in ice. To better understand how CPO patterns change in response to these variables, we performed quantitative analyses on neutron diffraction data between 2010...
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crcambridgeupr:10.1017/jog.2022.95 2024-04-07T07:53:42+00:00 Crystallographic preferred orientation (CPO) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data Hunter, Nicholas J. R. Wilson, Christopher J. L. Luzin, Vladimir Australian Nuclear Science and Technology Organisation Australian Nuclear Science and Technology Organisation Australian Nuclear Science and Technology Organisation Australian Nuclear Science and Technology Organisation 2022 http://dx.doi.org/10.1017/jog.2022.95 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000958 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 69, issue 276, page 737-748 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2022 crcambridgeupr https://doi.org/10.1017/jog.2022.95 2024-03-08T00:36:17Z Abstract Strain, temperature and strain rate are crucial factors governing the development of crystallographic preferred orientations (CPO) in ice. To better understand how CPO patterns change in response to these variables, we performed quantitative analyses on neutron diffraction data between 2010 and 2019, collected in situ during uniaxial compression experiments on deuterium ice. At strains >10% and temperatures <−10°C, the c -axis pattern switches from a single maximum (‘cluster’) to small circle (‘cone’), both oriented parallel to shortening. The diameter and mean width of the cone pattern decrease as strain and/or strain rate increases. Prismatic axis ( a and m ) patterns are characterised by great circles parallel to the pole figure margin and may be distinguishable from the patterns in ice deformed under simple shear. While strain has the main influence on the degree of preferred orientation (or CPO ‘strength’), both temperature and strain rate have minor influences, which limits the extent to which CPOs can be used to measure strain. As cluster patterns can be observed in the c -axes of ice deformed under both pure and simple shear settings, this may complicate interpretations of flow geometry in terrestrial ice unless the prismatic axis patterns are also considered. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 1 12 |
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Cambridge University Press |
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English |
topic |
Earth-Surface Processes |
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Earth-Surface Processes Hunter, Nicholas J. R. Wilson, Christopher J. L. Luzin, Vladimir Crystallographic preferred orientation (CPO) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data |
topic_facet |
Earth-Surface Processes |
description |
Abstract Strain, temperature and strain rate are crucial factors governing the development of crystallographic preferred orientations (CPO) in ice. To better understand how CPO patterns change in response to these variables, we performed quantitative analyses on neutron diffraction data between 2010 and 2019, collected in situ during uniaxial compression experiments on deuterium ice. At strains >10% and temperatures <−10°C, the c -axis pattern switches from a single maximum (‘cluster’) to small circle (‘cone’), both oriented parallel to shortening. The diameter and mean width of the cone pattern decrease as strain and/or strain rate increases. Prismatic axis ( a and m ) patterns are characterised by great circles parallel to the pole figure margin and may be distinguishable from the patterns in ice deformed under simple shear. While strain has the main influence on the degree of preferred orientation (or CPO ‘strength’), both temperature and strain rate have minor influences, which limits the extent to which CPOs can be used to measure strain. As cluster patterns can be observed in the c -axes of ice deformed under both pure and simple shear settings, this may complicate interpretations of flow geometry in terrestrial ice unless the prismatic axis patterns are also considered. |
author2 |
Australian Nuclear Science and Technology Organisation Australian Nuclear Science and Technology Organisation Australian Nuclear Science and Technology Organisation Australian Nuclear Science and Technology Organisation |
format |
Article in Journal/Newspaper |
author |
Hunter, Nicholas J. R. Wilson, Christopher J. L. Luzin, Vladimir |
author_facet |
Hunter, Nicholas J. R. Wilson, Christopher J. L. Luzin, Vladimir |
author_sort |
Hunter, Nicholas J. R. |
title |
Crystallographic preferred orientation (CPO) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data |
title_short |
Crystallographic preferred orientation (CPO) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data |
title_full |
Crystallographic preferred orientation (CPO) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data |
title_fullStr |
Crystallographic preferred orientation (CPO) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data |
title_full_unstemmed |
Crystallographic preferred orientation (CPO) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data |
title_sort |
crystallographic preferred orientation (cpo) patterns in uniaxially compressed deuterated ice: quantitative analysis of historical data |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/jog.2022.95 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143022000958 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 69, issue 276, page 737-748 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2022.95 |
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Journal of Glaciology |
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12 |
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1795669782296526848 |