Using Electron Backscatter Diffraction Patterns to Examine Recrystallization in Polar Ice Sheets
The fabric of polycrystalline ice is typically described using the c-axis orientation alone, but this is insufficient for a full description of grain orientations in this hexagonal material. Electron backscatter diffraction (EBSD) provides full c- and a-axis orientation of individual grains, and is...
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ftdartmouthcoll:oai:digitalcommons.dartmouth.edu:facoa-4517 2023-07-16T03:56:57+02:00 Using Electron Backscatter Diffraction Patterns to Examine Recrystallization in Polar Ice Sheets Obbard, Rachel Baker, Ian Sieg, Katherine 2006-01-01T08:00:00Z application/pdf https://digitalcommons.dartmouth.edu/facoa/3528 https://doi.org/10.3189/172756506781828458 https://digitalcommons.dartmouth.edu/context/facoa/article/4517/viewcontent/div_class_title_using_electron_backscatter_diffraction_patterns_to_examine_recrystallization_in_polar_ice_sheets_div.pdf unknown Dartmouth Digital Commons https://digitalcommons.dartmouth.edu/facoa/3528 doi:10.3189/172756506781828458 https://digitalcommons.dartmouth.edu/context/facoa/article/4517/viewcontent/div_class_title_using_electron_backscatter_diffraction_patterns_to_examine_recrystallization_in_polar_ice_sheets_div.pdf Dartmouth Scholarship textures high angle grain boundary reorientation polygonization grain growth electron backscattering electron diffraction diffraction pattern recrystallization crystal orientation microstructures polycrystalline ice ice sheets polar region ice caps greenland polar regions arctic region texture Earth Sciences Glaciology Physical Sciences and Mathematics text 2006 ftdartmouthcoll https://doi.org/10.3189/172756506781828458 2023-06-28T10:44:16Z The fabric of polycrystalline ice is typically described using the c-axis orientation alone, but this is insufficient for a full description of grain orientations in this hexagonal material. Electron backscatter diffraction (EBSD) provides full c- and a-axis orientation of individual grains, and is used here to study Greenland Ice Sheet Project 2 (GISP2) ice specimens from depths of 1551, 1642 and 1745 m. Complete orientation data are used to compare nearest-neighbor relationships to overall fabric and to differentiate between recrystallization mechanisms. Changes in orientation between grains and subgrains in GISP2 specimens were correlated with the appearance of grain boundaries on thin sections and used to identify grain sets that were probably produced by polygonization. Comparison of grain misorientations that take into account both c- and a-axis differences with those derived from c-axis directions alone reveals the presence of polygonization and illustrates the usefulness of this technique. Text Arctic Greenland Greenland Ice Sheet Project Ice Sheet Dartmouth Digital Commons (Dartmouth College) Arctic Greenland Journal of Glaciology 52 179 546 557 |
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Open Polar |
collection |
Dartmouth Digital Commons (Dartmouth College) |
op_collection_id |
ftdartmouthcoll |
language |
unknown |
topic |
textures high angle grain boundary reorientation polygonization grain growth electron backscattering electron diffraction diffraction pattern recrystallization crystal orientation microstructures polycrystalline ice ice sheets polar region ice caps greenland polar regions arctic region texture Earth Sciences Glaciology Physical Sciences and Mathematics |
spellingShingle |
textures high angle grain boundary reorientation polygonization grain growth electron backscattering electron diffraction diffraction pattern recrystallization crystal orientation microstructures polycrystalline ice ice sheets polar region ice caps greenland polar regions arctic region texture Earth Sciences Glaciology Physical Sciences and Mathematics Obbard, Rachel Baker, Ian Sieg, Katherine Using Electron Backscatter Diffraction Patterns to Examine Recrystallization in Polar Ice Sheets |
topic_facet |
textures high angle grain boundary reorientation polygonization grain growth electron backscattering electron diffraction diffraction pattern recrystallization crystal orientation microstructures polycrystalline ice ice sheets polar region ice caps greenland polar regions arctic region texture Earth Sciences Glaciology Physical Sciences and Mathematics |
description |
The fabric of polycrystalline ice is typically described using the c-axis orientation alone, but this is insufficient for a full description of grain orientations in this hexagonal material. Electron backscatter diffraction (EBSD) provides full c- and a-axis orientation of individual grains, and is used here to study Greenland Ice Sheet Project 2 (GISP2) ice specimens from depths of 1551, 1642 and 1745 m. Complete orientation data are used to compare nearest-neighbor relationships to overall fabric and to differentiate between recrystallization mechanisms. Changes in orientation between grains and subgrains in GISP2 specimens were correlated with the appearance of grain boundaries on thin sections and used to identify grain sets that were probably produced by polygonization. Comparison of grain misorientations that take into account both c- and a-axis differences with those derived from c-axis directions alone reveals the presence of polygonization and illustrates the usefulness of this technique. |
format |
Text |
author |
Obbard, Rachel Baker, Ian Sieg, Katherine |
author_facet |
Obbard, Rachel Baker, Ian Sieg, Katherine |
author_sort |
Obbard, Rachel |
title |
Using Electron Backscatter Diffraction Patterns to Examine Recrystallization in Polar Ice Sheets |
title_short |
Using Electron Backscatter Diffraction Patterns to Examine Recrystallization in Polar Ice Sheets |
title_full |
Using Electron Backscatter Diffraction Patterns to Examine Recrystallization in Polar Ice Sheets |
title_fullStr |
Using Electron Backscatter Diffraction Patterns to Examine Recrystallization in Polar Ice Sheets |
title_full_unstemmed |
Using Electron Backscatter Diffraction Patterns to Examine Recrystallization in Polar Ice Sheets |
title_sort |
using electron backscatter diffraction patterns to examine recrystallization in polar ice sheets |
publisher |
Dartmouth Digital Commons |
publishDate |
2006 |
url |
https://digitalcommons.dartmouth.edu/facoa/3528 https://doi.org/10.3189/172756506781828458 https://digitalcommons.dartmouth.edu/context/facoa/article/4517/viewcontent/div_class_title_using_electron_backscatter_diffraction_patterns_to_examine_recrystallization_in_polar_ice_sheets_div.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Greenland Ice Sheet Project Ice Sheet |
genre_facet |
Arctic Greenland Greenland Ice Sheet Project Ice Sheet |
op_source |
Dartmouth Scholarship |
op_relation |
https://digitalcommons.dartmouth.edu/facoa/3528 doi:10.3189/172756506781828458 https://digitalcommons.dartmouth.edu/context/facoa/article/4517/viewcontent/div_class_title_using_electron_backscatter_diffraction_patterns_to_examine_recrystallization_in_polar_ice_sheets_div.pdf |
op_doi |
https://doi.org/10.3189/172756506781828458 |
container_title |
Journal of Glaciology |
container_volume |
52 |
container_issue |
179 |
container_start_page |
546 |
op_container_end_page |
557 |
_version_ |
1771543470064795648 |