Crystallographic Preferred Orientation (CPO) Development Governs Strain Weakening in Ice: Insights From High-Temperature Deformation Experiments
文献类型：期刊论文
| 作者 | Fan, Sheng3; Cross, Andrew J.1; Prior, David J.3; Goldsby, David L.4; Hager, Travis F.4; Negrini, Marianne3; Qi, Chao2 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2021-12-01 |
| 卷号 | 126期号:12页码:34 |
| 关键词 | high-temperature deformation ice strain weakening grain size crystallographic preferred orientation (CPO) electron backscatter diffraction (EBSD) |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2021JB023173 |
| 英文摘要 | Strain weakening leads to the formation of high-strain shear zones and strongly influences terrestrial ice discharge. In glacial flow models, strain weakening is assumed to arise from the alignment of weak basal planes-the development of a crystallographic preferred orientation, CPO-during flow. However, in experiments, ice strain weakening also coincides with grain size reduction, which has been invoked as a weakening mechanism in other minerals. To interrogate the relative contributions of CPO development and grain size reduction toward ice strain weakening, we deformed initially isotropic polycrystalline ice samples to progressively higher strains between -4 and -30 degrees C. Microstructural measurements were subsequently combined with flow laws to separately model the mechanical response expected to arise from CPO development and grain size reduction. Magnitudes of strain weakening predicted by the constitutive flow laws were then compared with the experimental measurements. Flow laws that only consider grain size do not predict weakening with strain despite grain size reduction. In contrast, flow laws solely considering CPO effects can reproduce the measured strain weakening. Thus, it is reasonable to assume that strain weakening in ice is dominated by CPO development, at least under high temperature (T-h >= 0.9) and high stress (>1 MPa), like those in our experiments. We speculate that at high homologous temperatures (T-h >= 0.9), CPO development will also govern the strain weakening behavior of other viscously anisotropic minerals, like olivine and quartz. Overall, we emphasize that geodynamic and glaciological models should incorporate CPOs to account for strain weakening, especially at high homologous temperatures. |
| WOS关键词 | GRAIN-SIZE DISTRIBUTION ; COMPOSITE FLOW LAW ; DYNAMIC RECRYSTALLIZATION ; POLYCRYSTALLINE ICE ; MICROSTRUCTURAL EVOLUTION ; SIMPLE SHEAR ; MODEL DEFORMATION ; TERTIARY CREEP ; HIGH-PRESSURE ; 2ND PHASES |
| 资助项目 | NASA fund[NNX15AM69G] ; Royal Society of New Zealand[UOO1116] ; Royal Society of New Zealand[UOO052] ; University of Otago doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform[ANTA1801] ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform[ASP-023-03] ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant[NZARI 2020-1-5] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000751383000067 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; University of Otago doctoral scholarship ; University of Otago doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; University of Otago doctoral scholarship ; University of Otago doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; University of Otago doctoral scholarship ; University of Otago doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant ; NASA fund ; NASA fund ; Royal Society of New Zealand ; Royal Society of New Zealand ; University of Otago doctoral scholarship ; University of Otago doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; Antarctica New Zealand doctoral scholarship ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform ; New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant ; New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/104906]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Fan, Sheng |
| 作者单位 | 1.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 3.Univ Otago, Dept Geol, Dunedin, New Zealand 4.Univ Penn, Dept Earth & Environm Sci, Philadelphia, PA 19104 USA |
| 推荐引用方式 GB/T 7714 | Fan, Sheng,Cross, Andrew J.,Prior, David J.,et al. Crystallographic Preferred Orientation (CPO) Development Governs Strain Weakening in Ice: Insights From High-Temperature Deformation Experiments[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(12):34. |
| APA | Fan, Sheng.,Cross, Andrew J..,Prior, David J..,Goldsby, David L..,Hager, Travis F..,...&Qi, Chao.(2021).Crystallographic Preferred Orientation (CPO) Development Governs Strain Weakening in Ice: Insights From High-Temperature Deformation Experiments.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(12),34. |
| MLA | Fan, Sheng,et al."Crystallographic Preferred Orientation (CPO) Development Governs Strain Weakening in Ice: Insights From High-Temperature Deformation Experiments".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.12(2021):34. |
入库方式： OAI收割
来源：地质与地球物理研究所
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