Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry
Publication Date
2022-05-25Journal Title
Geosciences
Publisher
MDPI
Volume
12
Issue
6
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Rutter, E., Wallis, D., & Kosiorek, K. (2022). Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry. Geosciences, 12 (6) https://doi.org/10.3390/geosciences12060222
Abstract
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.
Keywords
calcite, deformation twinning, EBSD, paleopiezometry, twin density, crystallographic orientation
Identifiers
External DOI: https://doi.org/10.3390/geosciences12060222
This record's URL: https://www.repository.cam.ac.uk/handle/1810/337532
Rights
Licence:
https://creativecommons.org/licenses/by/4.0/
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