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  2. 地质与地球物理研究所
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  4. 中国科学院地球与行星物理重点实验室
Evolution of Microstructural Properties in Sheared Iron-Rich Olivine

文献类型：期刊论文

作者Qi, Chao3; Zhao, Yong-Hong2; Zimmerman, Mark E.1; Kim, Daeyeong4; Kohlstedt, David L.1
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2021-03-01
卷号126期号:3页码:22
关键词crystallographic preferred orientation grain size olivine piezometer
ISSN号2169-9313
DOI10.1029/2020JB019629
英文摘要Iron-rich olivine is mechanically weaker than olivine of mantle composition, ca. Fo(90), and thus is more amenable to study under a wide range of laboratory conditions. To investigate the effects of iron content on deformation-produced crystallographic preferred orientation (CPO) and grain size, we analyzed the microstructures of olivine samples with compositions of Fo(70), Fo(50), and Fo(0) that were deformed in torsion under either anhydrous or hydrous conditions at 300 MPa. Electron backscatter diffraction (EBSD) observations reveal a transition in CPO from D-type fabric, induced by dislocation glide on both the (010)[100] and the (001)[100] slip systems, at low strains, to A-type fabric, caused by dislocation glide on the (010)[100] slip system, at high strains for all of our samples, independent of iron content and hydrous/anhydrous conditions. A similar evolution of fabric with increasing strain is also reported to occur for Fo(90). Radial seismic anisotropy increases with increasing strain, reaching a maximum value of similar to 1.15 at a shear strain of similar to 3.5 for each sample, demonstrating that the seismic anisotropy of naturally deformed olivine-rich rocks can be well approximated by that of iron-rich olivine. Based on EBSD observations, we derived a piezometer for which recrystallized grain size decreases inversely with stress to the similar to 1.2 power. Also, recrystallized grain size increases with increasing iron content. Our experimental results contribute to understanding the microstructural evolution in the mantle of not only Earth but also Mars, where the iron content in olivine is higher.
资助项目Key Research Program of the Institute of Geology and Geophysics, CAS[IGGCAS-201905] ; National Key R&D Program of China[2018YFC1504203] ; National Key R&D Program of China[SQ2017YFSF040025] ; NSF[EAR-1755805] ; KOPRI project[PE21050]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000638091600046
出版者AMER GEOPHYSICAL UNION
资助机构Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; NSF ; NSF ; NSF ; NSF ; KOPRI project ; KOPRI project ; KOPRI project ; KOPRI project ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; NSF ; NSF ; NSF ; NSF ; KOPRI project ; KOPRI project ; KOPRI project ; KOPRI project ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; NSF ; NSF ; NSF ; NSF ; KOPRI project ; KOPRI project ; KOPRI project ; KOPRI project ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; NSF ; NSF ; NSF ; NSF ; KOPRI project ; KOPRI project ; KOPRI project ; KOPRI project
源URL[http://ir.iggcas.ac.cn/handle/132A11/101134]  
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Zhao, Yong-Hong
作者单位1.Univ Minnesota, Dept Earth & Environm Sci, Minneapolis, MN USA
2.Peking Univ, Dept Geophys, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
4.Korea Polar Res Inst, Div Polar Earth Syst Sci, Incheon, South Korea
推荐引用方式
GB/T 7714		 Qi, Chao,Zhao, Yong-Hong,Zimmerman, Mark E.,et al. Evolution of Microstructural Properties in Sheared Iron-Rich Olivine[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(3):22.
APA Qi, Chao,Zhao, Yong-Hong,Zimmerman, Mark E.,Kim, Daeyeong,&Kohlstedt, David L..(2021).Evolution of Microstructural Properties in Sheared Iron-Rich Olivine.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(3),22.
MLA Qi, Chao,et al."Evolution of Microstructural Properties in Sheared Iron-Rich Olivine".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.3(2021):22.

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来源：地质与地球物理研究所

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