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

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 dete...

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Bibliographic Details
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
Description
Summary: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.

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