Nanoscale visualization of high-angle misorientations in quartz-rich rocks using SEM-EBSD and Atomic Force Microscopy

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Structural Geology Pub Date : 2024-04-30 DOI:10.1016/j.jsg.2024.105146
Soham Dey , Sandro Chatterjee , Sushree Ritu Ritanjali , Ritabrata Dobe , Rabibrata Mukherjee , Sumantra Mandal , Saibal Gupta
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Abstract

High-angle misorientations can significantly influence material properties. In this study, optical microscopy, Scanning Electron Microscope-Electron Backscatter Diffraction (SEM-EBSD), and Atomic Force Microscopy (AFM) have been used to investigate high-angle misorientations in quartz-bearing crustal rocks. Thin sections of high-grade quartzofeldspathic rocks were subjected to chemical mechanical polishing (CMP) with colloidal silica. In quartz, high-angle misorientations like random high angle grain boundaries (RHAGBs) and Dauphiné twin boundaries (DTBs) could be discriminated using EBSD techniques but not optical microscopy. In nanoscale AFM images, indented channels are observed along RHAGBs but not DTBs; these result from material removal during CMP, indicating lower compactness of RHAGBs compared to DTBs. Along any RHAGB, EBSD reveals different misorientations across segments between consecutive RHAGB-DTB intersections. Grains adjacent to these RHAGB segments have angles between their c-axes varying from 61-66° with parallel {1012} planes, and 81–84° with parallel {1122} planes, respectively. These symmetries represent the Japan and Sardinian twin laws of quartz, indicating that the RHAGB segments become low-energy twin boundaries, thereby reducing the overall surface energy of the aggregate. Finally, these results suggest that apart from surface topography quantification and high-resolution nanoscale imaging, AFM in conjunction with SEM-EBSD can be used for precisely locating sites for TEM study.

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利用 SEM-EBSD 和原子力显微镜对富含石英的岩石中的高角度错向进行纳米级可视化研究
高角度取向错误会严重影响材料特性。本研究采用光学显微镜、扫描电子显微镜-电子背散射衍射(SEM-EBSD)和原子力显微镜(AFM)来研究含石英的地壳岩石中的高角度错向。用胶体二氧化硅对高品位石英长石岩的薄片进行了化学机械抛光(CMP)。在石英中,随机高角度晶界(RHAGBs)和多菲涅孪晶界(DTBs)等高角度错向可通过 EBSD 技术而非光学显微镜进行分辨。在纳米级原子力显微镜图像中,沿 RHAGBs 观察到凹陷通道,而沿 DTBs 则没有;这是 CMP 期间材料去除的结果,表明 RHAGBs 的致密性低于 DTBs。在任何 RHAGB 上,EBSD 都会在连续的 RHAGB-DTB 交点之间的区段上显示出不同的错向。与这些 RHAGB 段相邻的晶粒,其 c 轴之间的夹角分别为 61-66° 与平行 {101‾2} 平面之间的夹角,以及 81-84° 与平行 {112‾2} 平面之间的夹角。这些对称性代表了石英的日本孪晶定律和撒丁孪晶定律,表明 RHAGB 段成为低能孪晶边界,从而降低了集合体的整体表面能。最后,这些结果表明,除了表面形貌量化和高分辨率纳米级成像外,AFM 与 SEM-EBSD 结合使用还可用于精确定位 TEM 研究的位置。
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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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