Subgrain boundaries and related microstructural features in EDML (Antarctica) deep ice core

Subgrain boundaries revealed as shallow sublimation grooves on ice sample surfaces are a direct and easily observable feature of intracrystalline deformation and recrystallization. Statistical data obtained from the EPICA Dronning Maud Land (EDML) deep ice core drilled in East Antarctica cannot dete...

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Bibliographic Details
Published in:Journal of Glaciology
Main Authors: Weikusat, Ilka, Kipfstuhl, Sepp, Faria, Sérgio H., Azuma, Nobuhiko, Miyamoto, Atsushi
Format: Article in Journal/Newspaper
Language:English
Published: International Glaciological Society
Subjects:
452
East Antarctica
Dronning Maud Land
Antarc*
Antarctica
EPICA
ice core
Journal of Glaciology
Online Access:http://hdl.handle.net/2115/40199
https://doi.org/10.3189/002214309788816614
Description
Summary:Subgrain boundaries revealed as shallow sublimation grooves on ice sample surfaces are a direct and easily observable feature of intracrystalline deformation and recrystallization. Statistical data obtained from the EPICA Dronning Maud Land (EDML) deep ice core drilled in East Antarctica cannot detect a depth region of increased subgrain-boundary formation. Grain-boundary morphologies show a strong influence of internal strain energy on the microstructure at all depths. The data do not support the classical view of a change of dominating recrystallization regimes with depth. Three major types of subgrain boundaries, reflecting high mechanical anisotropy, are specified in combination with crystal-orientation analysis.

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