Weikusat, Ilka; Kuiper, Ernst-Jan N; Pennock, Gillian M; Kipfstuhl, Sepp; Drury, Martyn R (2017): EBSD analysis of subgrain boundaries and dislocation slip systems in Antarctic and Greenland ice [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.879614, Supplement to: Weikusat, I et al. (2017): EBSD analysis of subgrain boundaries and dislocation slip systems in Antarctic and Greenland ice. Solid Earth, 35 pp, https://doi.org/10.5194/se-2017-12
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Abstract:
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).
Related to:
Kipfstuhl, Sepp; Hamann, Ilka; Lambrecht, Anja; Freitag, Johannes; Faria, Sérgio H; Grigoriev, Dimitri; Azuma, Nobuhiko (2006): Microstructure mapping: a new method for imaging deformation-induced microstructural features of ice on the grain scale. Journal of Glaciology, 52(178), 398-406, https://doi.org/10.3189/172756506781828647
Weikusat, Ilka; de Winter, Niels J; Pennock, Gillian M; Hayles, Michael F; Schneijdenberg, Chris T W M; Drury, Martyn R (2011): Cryogenic EBSD on ice: preserving a stable surface in a low pressure SEM. Journal of Microscopy, 242(3), 295-310, https://doi.org/10.1111/j.1365-2818.2010.03471.x
Project(s):
Glaciology @ AWI (AWI_Glac)
Coverage:
Median Latitude: 1.223750 * Median Longitude: -25.495800 * South-bound Latitude: -75.002500 * West-bound Longitude: -51.060000 * North-bound Latitude: 77.450000 * East-bound Longitude: 0.068400
Date/Time Start: 2001-01-10T00:00:00 * Date/Time End: 2009-08-20T00:00:00
Minimum DEPTH, ice/snow: 655.9 m * Maximum DEPTH, ice/snow: 719.0 m
Event(s):
EDML (EPICA Dronning Maud Land, DML28C01_00) * Latitude: -75.002500 * Longitude: 0.068400 * Date/Time Start: 2001-01-10T00:00:00 * Date/Time End: 2006-01-17T00:00:00 * Elevation: 2891.7 m * Recovery: 2774.15 m * Campaign: EPICA-Campaigns * Basis: Kohnen Station * Method/Device: EPICA drill (EDRILL) * Comment: Elevation is given with reference to WGS84
NEEM * Latitude: 77.450000 * Longitude: -51.060000 * Date/Time Start: 2009-05-01T00:00:00 * Date/Time End: 2009-08-20T00:00:00 * Elevation: 2545.0 m * Recovery: 2533.21 m * Location: Greenland * Method/Device: Ice drill (ICEDRILL)
Comment:
EBSD: Instrument: FEI Nova Nanolab 600 scanning electron microscope (SEM) equipped with an EBSD detector (Oxford Instruments, Abingdon, UK). Method: Weikusat et al. 2010
Light microscopy: Instrument: Leica DMLM. Method: Kipfstuhl et al. 2006
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Weikusat, Ilka | |||
| 2 | Latitude of event | Latitude | Weikusat, Ilka | |||
| 3 | Longitude of event | Longitude | Weikusat, Ilka | |||
| 4 | Elevation of event | Elevation | m | Weikusat, Ilka | ||
| 5 | DEPTH, ice/snow | Depth ice/snow | m | Weikusat, Ilka | Geocode | |
| 6 | File content | Content | Weikusat, Ilka | |||
| 7 | File name | File name | Weikusat, Ilka | |||
| 8 | File size | File size | kByte | Weikusat, Ilka | ||
| 9 | Uniform resource locator/link to file | URL file | Weikusat, Ilka |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 data points