Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry
Electron backscatter diffraction (EBSD) was used to determine the orientation of mechanically twinned grains in Carrara marble experimentally deformed to a small strain (≤4%) at room temperature and at a moderate confining pressure (225 MPa). The thicknesses of deformation twins were mostly too smal...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-05-01
|
| Series: | Geosciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3263/12/6/222 |
| _version_ | 1827660263372881920 |
|---|---|
| author | Ernest Rutter David Wallis Kamil Kosiorek |
| author_facet | Ernest Rutter David Wallis Kamil Kosiorek |
| author_sort | Ernest Rutter |
| collection | DOAJ |
| description | Electron backscatter diffraction (EBSD) was used to determine the orientation of mechanically twinned grains in Carrara marble experimentally deformed to a small strain (≤4%) at room temperature and at a moderate confining pressure (225 MPa). The thicknesses of deformation twins were mostly too small to permit determination of their orientation by EBSD but it proved possible to measure their orientations by calculating possible twin orientations from host grain orientation, then comparing calculated traces to the observed twin traces. The validity of the Turner & Weiss method for principal stress orientations was confirmed, particularly when based on calculation of resolved shear stress. Methods of paleopiezometry based on twinned volume fraction were rejected but a practical approach is explored based on twin density. However, although twin density correlates positively with resolved shear stress, there is intrinsic variability due to unconstrained variables such as non-uniform availability of twin nucleation sites around grain boundaries that imposes a limit on the achievable accuracy of this approach. |
| first_indexed | 2024-03-09T23:42:31Z |
| format | Article |
| id | doaj.art-0eca1d2f0404460283882df9b2caeffc |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-09T23:42:31Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-0eca1d2f0404460283882df9b2caeffc2023-11-23T16:49:39ZengMDPI AGGeosciences2076-32632022-05-0112622210.3390/geosciences12060222Application of Electron Backscatter Diffraction to Calcite-Twinning PaleopiezometryErnest Rutter0David Wallis1Kamil Kosiorek2Rock Deformation Lab, Department of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UKSchool of Earth and Environmental Sciences, University of Leeds, Leeds LS2 1JT, UKRock Deformation Lab, Department of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UKElectron backscatter diffraction (EBSD) was used to determine the orientation of mechanically twinned grains in Carrara marble experimentally deformed to a small strain (≤4%) at room temperature and at a moderate confining pressure (225 MPa). The thicknesses of deformation twins were mostly too small to permit determination of their orientation by EBSD but it proved possible to measure their orientations by calculating possible twin orientations from host grain orientation, then comparing calculated traces to the observed twin traces. The validity of the Turner & Weiss method for principal stress orientations was confirmed, particularly when based on calculation of resolved shear stress. Methods of paleopiezometry based on twinned volume fraction were rejected but a practical approach is explored based on twin density. However, although twin density correlates positively with resolved shear stress, there is intrinsic variability due to unconstrained variables such as non-uniform availability of twin nucleation sites around grain boundaries that imposes a limit on the achievable accuracy of this approach.https://www.mdpi.com/2076-3263/12/6/222calcitedeformation twinningEBSDpaleopiezometrytwin densitycrystallographic orientation |
| spellingShingle | Ernest Rutter David Wallis Kamil Kosiorek Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry Geosciences calcite deformation twinning EBSD paleopiezometry twin density crystallographic orientation |
| title | Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry |
| title_full | Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry |
| title_fullStr | Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry |
| title_full_unstemmed | Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry |
| title_short | Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry |
| title_sort | application of electron backscatter diffraction to calcite twinning paleopiezometry |
| topic | calcite deformation twinning EBSD paleopiezometry twin density crystallographic orientation |
| url | https://www.mdpi.com/2076-3263/12/6/222 |
| work_keys_str_mv | AT ernestrutter applicationofelectronbackscatterdiffractiontocalcitetwinningpaleopiezometry AT davidwallis applicationofelectronbackscatterdiffractiontocalcitetwinningpaleopiezometry AT kamilkosiorek applicationofelectronbackscatterdiffractiontocalcitetwinningpaleopiezometry |