Subgrain boundaries and related microstructural features in EDML (Antarctica) deep ice core
Authors: Weikusat, Ilka; Kipfstuhl, Sepp; Faria, Sérgio H.; Azuma, Nobuhiko; Miyamoto, Atsushi
Source: Journal of Glaciology, Volume 55, Number 191, June 2009 , pp. 461-472(12)
Publisher: International Glaciological Society
Abstract: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.
Document Type: Research Article
Publication date: June 1, 2009
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