文章基本信息

标题：Using electron backscatter diffraction patterns to examine recrystallization in polar ice sheets
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作者：Rachel Obbard ; Ian Baker ; Katherine Sieg 等
期刊名称：Journal of Glaciology
印刷版ISSN：0022-1430
电子版ISSN：1727-5652
出版年度：2006
卷号：52
期号：179
页码：546-557
DOI：10.3189/172756506781828458
出版社：Cambridge University Press
摘要：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.