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Volume 10, issue 1
The Cryosphere, 10, 359–370, 2016
https://doi.org/10.5194/tc-10-359-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
The Cryosphere, 10, 359–370, 2016
https://doi.org/10.5194/tc-10-359-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 Feb 2016

Research article | 12 Feb 2016

Small-scale disturbances in the stratigraphy of the NEEM ice core: observations and numerical model simulations

D. Jansen et al.
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Cited articles  
Alley, R. B., Gow, A. J., Johnsen, S. J., Kipfstuhl, J., Meese, D. A., and Thorsteinsson, T.: Comparison of deep ice cores. Nature, 373, 393–394, 1995.
Alley, R. B., Gow, A. J., Meese, D. A., Fitzpatrick, J. J., Waddington, E. D. and Bolzan, J. F.: Grain-scale processes, folding, and stratigraphic disturbance in the GISP2 ice core, J. Geophys. Res., 102, 26819–26830, 1997.
Alsop, G. I. and Carreras, J.: The structural evolution of sheath folds: A case study from Cap de Creus, J. Struct. Geol., 29, 1915–1930, https://doi.org/10.1016/j.jsg.2007.09.010, 2007.
Azuma, N. and Goto-Azuma, K.: An anisotropic flow law for ice-sheet ice and its implications, Ann. Glaciol., 23, 202–208, 1996.
Bons, P. D. and Urai, J. L.: An apparatus to experimentally model the dynamics of ductile shear zones, Tectonophysics, 256, 145–164, https://doi.org/10.1016/0040-1951(95)00161-1, 1996.
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In this study we present examples of typical small-scale folds observed in the NEEM ice core, North Greenland, and discuss their characteristics. Numerical modelling of viscoplastic deformation and dynamic recrystallisation was used to improve the understanding of the formation of the observed structures under simple shear boundary conditions. We conclude that the folds originate from bands of grains with a tilted lattice relative to the strong lattice preferred orientation below 1500 m depth.
In this study we present examples of typical small-scale folds observed in the NEEM ice core,...
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