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Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures
Qi, Chao1,2; Prior, David J.3; Craw, Lisa3; Fan, Sheng3; Llorens, Maria-Gema4; Griera, Albert4; Negrini, Marianne3; Bons, Paul D.5; Goldsby, David L.1
2019-02-01
Source PublicationCRYOSPHERE
ISSN1994-0416
Volume13Issue:1Pages:351-371
AbstractSynthetic polycrystalline ice was sheared at temperatures of -5, -20 and -30 degrees C, to different shear strains, up to gamma = 2.6, equivalent to a maximum stretch of 2.94 (final line length is 2.94 times the original length). Cryo-electron backscatter diffraction (EBSD) analysis shows that basal intracrystalline slip planes become preferentially oriented parallel to the shear plane in all experiments, with a primary cluster of crystal c axes (the c axis is perpendicular to the basal plane) perpendicular to the shear plane. In all except the two highest-strain experiments at -30 degrees C, a secondary cluster of c axes is observed, at an angle to the primary cluster. With increasing strain, the primary c -axis cluster strengthens. With increasing temperature, both clusters strengthen. In the -5 degrees C experiments, the angle between the two clusters reduces with strain. The c -axis clusters are elongated perpendicular to the shear direction. This elongation increases with increasing shear strain and with decreasing temperature. Highly curved grain boundaries are more prevalent in samples sheared at higher temperatures. At each temperature, the proportion of curved boundaries decreases with increasing shear strain. Subgrains are observed in all samples. Microstructural interpretations and comparisons of the data from experimentally sheared samples with numerical models suggest that the observed crystallographic orientation patterns result from a balance of the rates of lattice rotation (during dislocation creep) and growth of grains by strain-induced grain boundary migration (GBM). GBM is faster at higher temperatures and becomes less important as shear strain increases. These observations and interpretations provide a hypothesis to be tested in further experiments and using numerical models, with the ultimate goal of aiding the interpretation of crystallographic preferred orientations in naturally deformed ice.
DOI10.5194/tc-13-351-2019
Funding OrganizationNASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; Matariki fund of the University of Otago ; Matariki fund of the University of Otago ; University of Otago ; University of Otago ; Antarctica New Zealand ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding ; University of Otago PERT (Polar Environment Research Theme) seed funding ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; Matariki fund of the University of Otago ; Matariki fund of the University of Otago ; University of Otago ; University of Otago ; Antarctica New Zealand ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding ; University of Otago PERT (Polar Environment Research Theme) seed funding ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; Matariki fund of the University of Otago ; Matariki fund of the University of Otago ; University of Otago ; University of Otago ; Antarctica New Zealand ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding ; University of Otago PERT (Polar Environment Research Theme) seed funding ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; Matariki fund of the University of Otago ; Matariki fund of the University of Otago ; University of Otago ; University of Otago ; Antarctica New Zealand ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding ; University of Otago PERT (Polar Environment Research Theme) seed funding
WOS KeywordANISOTROPIC POLYCRYSTALLINE ICE ; DYNAMIC RECRYSTALLIZATION ; MICROSTRUCTURAL EVOLUTION ; CRYSTAL ANISOTROPY ; FABRIC DEVELOPMENT ; FLOW-LAW ; DEFORMATION ; STRAIN ; CREEP ; CORE
Language英语
Funding ProjectNASA fund[NNX15AM69G] ; Royal Society of New Zealand[UOO1116] ; Royal Society of New Zealand[UOO052] ; Matariki fund of the University of Otago ; University of Otago ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding
Funding OrganizationNASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; Matariki fund of the University of Otago ; Matariki fund of the University of Otago ; University of Otago ; University of Otago ; Antarctica New Zealand ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding ; University of Otago PERT (Polar Environment Research Theme) seed funding ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; Matariki fund of the University of Otago ; Matariki fund of the University of Otago ; University of Otago ; University of Otago ; Antarctica New Zealand ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding ; University of Otago PERT (Polar Environment Research Theme) seed funding ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; Matariki fund of the University of Otago ; Matariki fund of the University of Otago ; University of Otago ; University of Otago ; Antarctica New Zealand ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding ; University of Otago PERT (Polar Environment Research Theme) seed funding ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; Matariki fund of the University of Otago ; Matariki fund of the University of Otago ; University of Otago ; University of Otago ; Antarctica New Zealand ; Antarctica New Zealand ; University of Otago PERT (Polar Environment Research Theme) seed funding ; University of Otago PERT (Polar Environment Research Theme) seed funding
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000457426200002
PublisherCOPERNICUS GESELLSCHAFT MBH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90520
Collection中国科学院地质与地球物理研究所
Corresponding AuthorQi, Chao
Affiliation1.Univ Penn, Dept Earth & Environm Sci, Philadelphia, PA 19104 USA
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
3.Univ Otago, Dept Geol, Dunedin, New Zealand
4.Univ Autonoma Barcelona, Dept Geol, Barcelona, Spain
5.Eberhard Karls Univ Tubingen, Dept Geosci, Tubingen, Germany
Recommended Citation
GB/T 7714
Qi, Chao,Prior, David J.,Craw, Lisa,et al. Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures[J]. CRYOSPHERE,2019,13(1):351-371.
APA Qi, Chao.,Prior, David J..,Craw, Lisa.,Fan, Sheng.,Llorens, Maria-Gema.,...&Goldsby, David L..(2019).Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures.CRYOSPHERE,13(1),351-371.
MLA Qi, Chao,et al."Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures".CRYOSPHERE 13.1(2019):351-371.
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