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Titre du document / Document title

Using electron backscatter diffraction patterns to examine recrystallization in polar ice sheets

Auteur(s) / Author(s)

OBBARD Rachel (1) ; BAKER Ian (1) ; SIEG Katherine (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Thayer School of Engineering, Dartmouth College, Hanover, NH 03755-8000, ETATS-UNIS

Résumé / Abstract

The fabric of polycrystalline ice is typically described using the c-axis orientation alone, but this is insufficient for a full description of grain orientations in this hexagonal material. Electron backscatter diffraction (EBSD) provides full c- and a-axis orientation of individual grains, and is used here to study Greenland Ice Sheet Project 2 (GISP2) ice specimens from depths of 1551, 1642 and 1745 m. Complete orientation data are used to compare nearest-neighbor relationships to overall fabric and to differentiate between recrystallization mechanisms. Changes in orientation between grains and subgrains in GISP2 specimens were correlated with the appearance of grain boundaries on thin sections and used to identify grain sets that were probably produced by polygonization. Comparison of grain misorientations that take into account both c- and a-axis differences with those derived from c-axis directions alone reveals the presence of polygonization and illustrates the usefulness of this technique.

Revue / Journal Title

Journal of Glaciology    ISSN  0022-1430   CODEN JOGLAO 

Source / Source

2006, vol. 52, no179, pp. 546-558 [13 page(s) (article)] (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

International Glaciological Society, Cambridge, ROYAUME-UNI  (1947) (Revue)

Mots-clés anglais / English Keywords

polar regions

;

Arctic region

;

Greenland

;

textures

;

High angle grain boundary

;

Reorientation

;

Polygonization

;

Grain growth

;

Electron backscattering

;

electron diffraction

;

Diffraction pattern

;

recrystallization

;

Crystal orientation

;

microstructures

;

Polycrystalline ice

;

ice sheets

;

Polar region

;

ice caps

;

Mots-clés français / French Keywords

Région Polaire

;

Arctique

;

Groenland

;

Texture

;

Désorientation grain

;

Réorientation

;

Polygonisation

;

Croissance grain

;

Rétrodiffusion électron

;

Diffraction électron

;

Diagramme diffraction

;

Recristallisation

;

Orientation cristalline

;

Microstructure

;

Glace polycristalline

;

Inlandsis

;

Zone polaire

;

Calotte glaciaire

;

Mots-clés espagnols / Spanish Keywords

Ártico

;

Groenlandia

;

Textura

;

Límite intergranular gran ángulo

;

Reorientación

;

Poligonización

;

Crecimiento grano

;

Difracción electrónica

;

Diagrama difracción

;

Recristalización

;

Orientación cristalina

;

Microestructura

;

Hielo policristalino

;

Masa de hielo

;

Zona polar

;

Casquete glaciar

;

Localisation / Location

INIST-CNRS, Cote INIST : 5524, 35400014550082.0060

Nº notice refdoc (ud4) : 18512842



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