Europhys. Lett.
Volume 67, Number 6, September 2004
Page(s) 1038 - 1044
Section Interdisciplinary physics and related areas of science and technology
Published online 01 September 2004
Europhys. Lett., 67 (6), pp. 1038-1044 (2004)
DOI: 10.1209/epl/i2004-10139-0

Deformation of grain boundaries in polar ice

G. 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