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

DOI

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 deep ice core at 656 m depth) and from the Greenland (NEEM deep ice core at 719 m depth).

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

Supplement to: 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. Solid Earth, 35 pp

Identifier
DOI https://doi.org/10.1594/PANGAEA.879614
Related Identifier IsSupplementTo https://doi.org/10.5194/se-2017-12
Related Identifier References https://doi.org/10.3189/172756506781828647
Related Identifier References https://doi.org/10.1111/j.1365-2818.2010.03471.x
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.879614
Provenance
Creator Weikusat, Ilka ORCID logo; Kuiper, Ernst-Jan N; Pennock, Gillian M; Kipfstuhl, Sepp ORCID logo; Drury, Martyn R ORCID logo
Publisher PANGAEA
Publication Year 2017
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 8 data points
Discipline Geosciences; Geospheric Sciences; Glaciology; Natural Sciences
Spatial Coverage (-51.060W, -75.002S, 0.068E, 77.450N); Greenland
Temporal Coverage Begin 2001-01-10T00:00:00Z
Temporal Coverage End 2009-08-20T00:00:00Z