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Ice fabric evolution process understood from anisotropic distribution of a-axis orientation on the GRIP (Greenland) ice core

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Title: Ice fabric evolution process understood from anisotropic distribution of a-axis orientation on the GRIP (Greenland) ice core
Authors: Miyamoto, Atsushi Browse this author
Shoji, Hitoshi Browse this author
Hori, Akira Browse this author
Hondoh, Takeo Browse this author →KAKEN DB
Clausen, Henrik B. Browse this author
Watanabe, Okitsugu Browse this author
Keywords: ice core
a-axis orientation
mechanical property
Issue Date: Aug-2005
Publisher: International Glaciological Society
Journal Title: Annals of Glaciology
Volume: 42
Start Page: 47
End Page: 52
Publisher DOI: 10.3189/172756405781812501
Abstract: To better understand how ice fabric evolves in polar ice sheets, we use X-ray diffraction to measure ice crystal orientations. X-ray measurement equipment which can measure the orientation of the c axis and a axis of each crystal in a thin section with high measurement accuracy was developed. In this study, we present a-axes orientation distribution of the deep part of the GRIP (Greenland summit) ice core. At some depths, we find an anisotropic distribution of a-axes orientation. Long-term uniaxial compression tests are also carried out on the GRIP ice core to investigate the ice fabric evolution process. The c-axis orientation distribution develops into a stronger single maximum as the strain increases up to about 20% strain. We find that the a axes of each grain also tend to cluster close to nearly a mutual direction. We discuss the development process of ice fabrics, taking into consideration the distribution of the a-axis orientations. It is suggested that these fabrics may be attributed to a local simple shear deformation in the deep part of an ice sheet.
Rights: © 2005 International Glaciological Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 宮本 淳

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