Application of Electron Backscatter Diffraction to Calcite-Twinning Paleopiezometry

نویسندگان

چکیده

Electron backscatter diffraction (EBSD) was used to determine the orientation of mechanically twinned grains in Carrara marble experimentally deformed a small strain (?4%) at room temperature and moderate confining pressure (225 MPa). The thicknesses deformation twins were mostly too permit determination their by EBSD but it proved possible measure orientations calculating twin from host grain orientation, then comparing calculated traces observed traces. validity Turner & Weiss method for principal stress confirmed, particularly when based on calculation resolved shear stress. Methods paleopiezometry volume fraction rejected practical approach is explored density. However, although density correlates positively with stress, there intrinsic variability due unconstrained variables such as non-uniform availability nucleation sites around boundaries that imposes limit achievable accuracy this approach.

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ژورنال

عنوان ژورنال: Geosciences

سال: 2022

ISSN: ['2076-3263']

DOI: https://doi.org/10.3390/geosciences12060222