Orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography
In this study on temperature gradient metamorphism in snow, we investigate the hypothesis that there exists a favourable crystalline orientation relative to the temperature gradient, giving rise to a faster formation of crystallographic facets. We applied in situ time-lapse diffraction contrast tomo...
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ftdoajarticles:oai:doaj.org/article:68756c56598b4ce78f1d4ec09ddf716b 2023-05-15T18:32:25+02:00 Orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography R. Granger F. Flin W. Ludwig I. Hammad C. Geindreau 2021-09-01T00:00:00Z https://doi.org/10.5194/tc-15-4381-2021 https://doaj.org/article/68756c56598b4ce78f1d4ec09ddf716b EN eng Copernicus Publications https://tc.copernicus.org/articles/15/4381/2021/tc-15-4381-2021.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-15-4381-2021 1994-0416 1994-0424 https://doaj.org/article/68756c56598b4ce78f1d4ec09ddf716b The Cryosphere, Vol 15, Pp 4381-4398 (2021) Environmental sciences GE1-350 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/tc-15-4381-2021 2022-12-31T12:59:00Z In this study on temperature gradient metamorphism in snow, we investigate the hypothesis that there exists a favourable crystalline orientation relative to the temperature gradient, giving rise to a faster formation of crystallographic facets. We applied in situ time-lapse diffraction contrast tomography on a snow sample with a density of 476 kg m −3 subject to a temperature gradient of 52 <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><msup><mi/><mo>∘</mo></msup><mi mathvariant="normal">C</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="34pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="673f1dfdd766a256fdec1152081e38ac"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-15-4381-2021-ie00001.svg" width="34pt" height="13pt" src="tc-15-4381-2021-ie00001.png"/></svg:svg> at mean temperatures in the range between − 4.1 and − 2.1 ∘ C for 3 d. The orientations of about 900 grains along with their microstructural evolution are followed over time. Faceted crystals appear during the evolution, and from the analysis of the material fluxes, we observe higher sublimation–deposition rates for grains with their c axis in the horizontal plane at the beginning of the metamorphism. This remains the case up to the end of the experiment for what concerns sublimation while the differences vanish for deposition. The latter observation is explained in terms of geometrical interactions between grains. Article in Journal/Newspaper The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 15 9 4381 4398 |
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Directory of Open Access Journals: DOAJ Articles |
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topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
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Environmental sciences GE1-350 Geology QE1-996.5 R. Granger F. Flin W. Ludwig I. Hammad C. Geindreau Orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
In this study on temperature gradient metamorphism in snow, we investigate the hypothesis that there exists a favourable crystalline orientation relative to the temperature gradient, giving rise to a faster formation of crystallographic facets. We applied in situ time-lapse diffraction contrast tomography on a snow sample with a density of 476 kg m −3 subject to a temperature gradient of 52 <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow class="unit"><msup><mi/><mo>∘</mo></msup><mi mathvariant="normal">C</mi><mspace width="0.125em" linebreak="nobreak"/><msup><mi mathvariant="normal">m</mi><mrow><mo>-</mo><mn mathvariant="normal">1</mn></mrow></msup></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="34pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="673f1dfdd766a256fdec1152081e38ac"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-15-4381-2021-ie00001.svg" width="34pt" height="13pt" src="tc-15-4381-2021-ie00001.png"/></svg:svg> at mean temperatures in the range between − 4.1 and − 2.1 ∘ C for 3 d. The orientations of about 900 grains along with their microstructural evolution are followed over time. Faceted crystals appear during the evolution, and from the analysis of the material fluxes, we observe higher sublimation–deposition rates for grains with their c axis in the horizontal plane at the beginning of the metamorphism. This remains the case up to the end of the experiment for what concerns sublimation while the differences vanish for deposition. The latter observation is explained in terms of geometrical interactions between grains. |
format |
Article in Journal/Newspaper |
author |
R. Granger F. Flin W. Ludwig I. Hammad C. Geindreau |
author_facet |
R. Granger F. Flin W. Ludwig I. Hammad C. Geindreau |
author_sort |
R. Granger |
title |
Orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography |
title_short |
Orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography |
title_full |
Orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography |
title_fullStr |
Orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography |
title_full_unstemmed |
Orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography |
title_sort |
orientation selective grain sublimation–deposition in snow under temperature gradient metamorphism observed with diffraction contrast tomography |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-4381-2021 https://doaj.org/article/68756c56598b4ce78f1d4ec09ddf716b |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_source |
The Cryosphere, Vol 15, Pp 4381-4398 (2021) |
op_relation |
https://tc.copernicus.org/articles/15/4381/2021/tc-15-4381-2021.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-15-4381-2021 1994-0416 1994-0424 https://doaj.org/article/68756c56598b4ce78f1d4ec09ddf716b |
op_doi |
https://doi.org/10.5194/tc-15-4381-2021 |
container_title |
The Cryosphere |
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15 |
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9 |
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4381 |
op_container_end_page |
4398 |
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1766216524418252800 |