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: Dataset
• Language: English
• Published: PANGAEA 2009
• Subjects: EDML; EDRILL; EPICA; EPICA-Campaigns; EPICA drill; EPICA Dronning Maud Land; DML28C01_00; European Project for Ice Coring in Antarctica; Kohnen Station; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158; Arctic; Antarctic; East Antarctica; Dronning Maud Land; Kohnen; Antarc*; Antarctica; ice core; Journal of Glaciology; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.807197; https://doi.org/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.