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

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...

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Bibliographic Details
Main Authors: Weikusat, Ilka, Kuiper, Ernst-Jan N, Pennock, Gillian M, Kipfstuhl, Sepp, Drury, Martyn R
Format: Dataset
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 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
Martyn
Antarc*
Antarctica
DML
EPICA
ice core
Online Access:https://dx.doi.org/10.1594/pangaea.879614
https://doi.pangaea.de/10.1594/PANGAEA.879614
Description
Summary: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

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