EBSD analysis of subgrain boundaries and dislocation slip systems in Antarctic and Greenland ice ...

• Main Authors: Weikusat, Ilka, Kuiper, Ernst-Jan N, Pennock, Gillian M, Kipfstuhl, Sepp, Drury, Martyn R
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DEPTH, ice/snow; File content; File name; File size; Uniform resource locator/link to file; EPICA drill; Ice drill; EPICA-Campaigns; Kohnen Station; Glaciology @ AWI AWI_Glac; Antarctic; Greenland; Kohnen; Antarc*; Antarctica; DML; EPICA; ice core
• Online Access: https://dx.doi.org/10.1594/pangaea.879614; https://doi.pangaea.de/10.1594/PANGAEA.879614

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=, while glide on non-basal planes can involve dislocations with b=, b=[c] and b=. 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 ... : EBSD: Instrument: FEI Nova Nanolab 600 scanning electron microscope (SEM) equipped with an EBSD detector (Oxford Instruments, Abingdon, UK). Method: Weikusat et al. 2010Light microscopy: Instrument: Leica DMLM. Method: Kipfstuhl et al. 2006 ...