1. Calcite Deformation Twins: From Crystal Plasticity to Applications in Geosciences.
- Author
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Lacombe, Olivier
- Subjects
TWINNING (Crystallography) ,EARTH sciences ,GEOLOGY ,DEFORMATIONS (Mechanics) ,CALCITE - Abstract
The idea that the critical resolved shear stress is the empirical stress at which a statistically significant number of twin nucleation sites become suddenly active provides a possible elegant way to reconcile the picture of the twin-forming process with the practical existence of a critical resolved shear stress [[4]]. Recent calcite twin-based paleopiezometric studies take into account the dependence of the critical resolved shear stress on these parameters ([[6], [12]]). E-twinning is the dominant mechanism of plastic deformation of calcite at low temperature (<300 °C), and in most limestones, e-twins are, at the crystal scale, the dominant microstructures. The adoption of a single critical resolved shear stress for twinning has been challenged [[17]] because the differential stress necessary to produce twinning is dependent upon grain size [[1]] and strain (calcite hardens once twinned) [[18]]. [Extracted from the article]
- Published
- 2022
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