Deformation of grain boundaries in polar iceG. Durand1, F. Graner2 and J. Weiss1
1 Laboratoire de Glaciologie et de Géophysique de l'Environnement (FRE 2192 CNRS - Université J. Fourier Grenoble 1) BP 96, F-38402 Saint Martin d'Hères cedex, France
2 Laboratoire de Spectrométrie Physique (UMR 5588 CNRS -Université J. Fourier Grenoble 1) BP 87, F-38402 Saint Martin d'Hères cedex, France
(Received 5 April 2004; accepted in final form 8 July 2004)
The ice microstructure (grain boundaries) is a key feature used to study ice evolution and to investigate past climatic changes. We studied a deep ice core, in Dome Concordia, Antarctica, which records past mechanical deformations. We measured a "texture tensor" which characterizes the pattern geometry and reveals local heterogeneities of deformation along the core. These results question key assumptions of the current models used for dating.
83.80.Nb - Geological materials: Earth, magma, ice, rocks, etc.
81.70.-q - Methods of materials testing and analysis.
62.20.Fe - Deformation and plasticity (including yield, ductility, and superplasticity).
© EDP Sciences 2004