EBSD analysis of subgrain boundaries and dislocation slip systems in Antarctic and Greenland ice
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| Sprache: | en |
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2017
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| author | Weikusat, Ilka Kuiper, Ernst-Jan N Pennock, Gillian M Kipfstuhl, Sepp Drury, Martyn R |
| author_facet | Weikusat, Ilka Kuiper, Ernst-Jan N Pennock, Gillian M Kipfstuhl, Sepp Drury, Martyn R |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Ice has a very high plastic anisotropy with easy dislocation glide on basal planes while glide on non-basal planes is much harder. Basal glide involves dislocations with Burgers vector b=<a>, while glide on non-basal planes can involve dislocations with b=<a>, b=[c] and b=<c+a>. During natural ductile flow of polar ice sheets most of the deformation is expected to occur by basal slip accommodated by other processes including non-basal slip and grain boundary processes, however the importance of different accommodating processes is controversial. The recent application of micro-diffraction analysis methods to ice such as X-ray Laue diffraction and electron backscattered diffraction (EBSD) has demonstrated that subgrain boundaries indicative of non-basal slip are present in naturally deformed ice, although, so far the available data sets are limited. In this study we present an analysis of a large number of subgrain boundaries in ice core samples from one depth level from two deep ice cores, from Antarctica (EPICA-DML deep ice core at 656 m depth) and from the Greenland (NEEM deep ice core at 719 m depth). |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_879614 |
| institution | PANGAEA |
| language | en |
| publishDate | 2017 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | EBSD analysis of subgrain boundaries and dislocation slip systems in Antarctic and Greenland ice Weikusat, Ilka Kuiper, Ernst-Jan N Pennock, Gillian M Kipfstuhl, Sepp Drury, Martyn R AWI_Glac; DEPTH, ice/snow; EDML; EDRILL; Elevation of event; EPICA-Campaigns; EPICA drill; EPICA Dronning Maud Land, DML28C01_00; Event label; File content; File name; File size; Glaciology @ AWI; Greenland; ICEDRILL; Ice drill; Kohnen Station; Latitude of event; Longitude of event; NEEM; Uniform resource locator/link to file Ice has a very high plastic anisotropy with easy dislocation glide on basal planes while glide on non-basal planes is much harder. Basal glide involves dislocations with Burgers vector b=<a>, while glide on non-basal planes can involve dislocations with b=<a>, b=[c] and b=<c+a>. During natural ductile flow of polar ice sheets most of the deformation is expected to occur by basal slip accommodated by other processes including non-basal slip and grain boundary processes, however the importance of different accommodating processes is controversial. The recent application of micro-diffraction analysis methods to ice such as X-ray Laue diffraction and electron backscattered diffraction (EBSD) has demonstrated that subgrain boundaries indicative of non-basal slip are present in naturally deformed ice, although, so far the available data sets are limited. In this study we present an analysis of a large number of subgrain boundaries in ice core samples from one depth level from two deep ice cores, from Antarctica (EPICA-DML deep ice core at 656 m depth) and from the Greenland (NEEM deep ice core at 719 m depth). |
| title | EBSD analysis of subgrain boundaries and dislocation slip systems in Antarctic and Greenland ice |
| topic | AWI_Glac; DEPTH, ice/snow; EDML; EDRILL; Elevation of event; EPICA-Campaigns; EPICA drill; EPICA Dronning Maud Land, DML28C01_00; Event label; File content; File name; File size; Glaciology @ AWI; Greenland; ICEDRILL; Ice drill; Kohnen Station; Latitude of event; Longitude of event; NEEM; Uniform resource locator/link to file |
| url | https://doi.org/10.1594/PANGAEA.879614 |