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

• Main Authors: Weikusat, Ilka, Kipfstuhl, Sepp, Faria, Sérgio H, Azuma, Nobuhiko, Miyamoto, Atsushi
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2009
• Subjects: EPICA drill; EPICA-Campaigns; Kohnen Station; European Project for Ice Coring in Antarctica EPICA; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Antarctica; Dronning Maud Land; East Antarctica; EPICA; ice core; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.807197; https://doi.pangaea.de/10.1594/PANGAEA.807197

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. ... : Supplement to: Weikusat, Ilka; Kipfstuhl, Sepp; Faria, Sérgio H; Azuma, Nobuhiko; Miyamoto, Atsushi (2009): Subgrain boundaries and related microstructural features in EDML (Antarctica) deep ice core. Journal of Glaciology, 55(191), 461-472 ...