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Intracrystalline deformation microstructures in natural olivine with implications for stress estimation

文献类型：期刊论文

作者Ma, Jian2; Liu, Wenlong2; Cao, Yi2; Zhang, Junfeng2; Liu, Chuanzhou1,3,4
刊名SCIENTIFIC REPORTS
出版日期2022-11-22
卷号12期号:1页码:15
ISSN号2045-2322
DOI10.1038/s41598-022-24538-2
英文摘要Constraining the stress related to lithospheric deformation in natural rocks is key to develop and test a geodynamic model. However, the cautions of extrapolating piezometers that are established on experimental samples to natural rocks are less addressed. In this study, we investigated the microstructures of a natural harzburgite sample using the electron backscatter diffraction (EBSD) technique. Subgrain boundary (SGB) geometries suggest large percentages of (010)[100] and {0kl}[100] dislocation slip systems in olivines. More importantly, multiple low-angle misorientation boundaries (LAMBs) variants are recognized for the first time in olivine based on their distinctive characteristics with the change of EBSD mapping step size. The LAMBs that exist at a small step size (<= 1 mu m) are mostly equivalent to real SGBs, while other LAMBs that appear only when the step size is larger (> 1 mu m) are artificial SGBs. Besides, the former develop mainly in the high LAMB density grains, whereas the latter are mostly found in the low LAMB density grains. This result reinforces the previous knowledge that the stress calculated using subgrain-related piezometers is meaningful only when real SGBs are captured at sufficiently small step size. Furthermore, we provide a proof of concept that SGB density and kernel average misorientation (KAM) are two viable metrics to estimate stress. These two alternative piezometers, which still need calibrations using the experimentally deformed samples, are anticipated to have wide applications in natural rocks.
WOS关键词RECRYSTALLIZED GRAIN-SIZE ; FORE-ARC MANTLES ; DYNAMIC RECRYSTALLIZATION ; SEISMIC ANISOTROPY ; SINGLE-CRYSTALS ; DEFORMED OLIVINE ; SUBGRAIN SIZE ; DISLOCATION ; TEMPERATURE ; LITHOSPHERE
资助项目National Natural Science Foundation of China[41902222] ; National Natural Science Foundation of China[41425012]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:000888057200003
出版者NATURE PORTFOLIO
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/107660]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Cao, Yi
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式
GB/T 7714		 Ma, Jian,Liu, Wenlong,Cao, Yi,et al. Intracrystalline deformation microstructures in natural olivine with implications for stress estimation[J]. SCIENTIFIC REPORTS,2022,12(1):15.
APA Ma, Jian,Liu, Wenlong,Cao, Yi,Zhang, Junfeng,&Liu, Chuanzhou.(2022).Intracrystalline deformation microstructures in natural olivine with implications for stress estimation.SCIENTIFIC REPORTS,12(1),15.
MLA Ma, Jian,et al."Intracrystalline deformation microstructures in natural olivine with implications for stress estimation".SCIENTIFIC REPORTS 12.1(2022):15.

入库方式： OAI收割

来源：地质与地球物理研究所

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