Rheology of Earth Materials :
Closing the gap between timescales in the laboratory and in the mantle

31 March 2023: New publication in European Journal of Mineralogy

Dislocations and disclinations in olivine

We report a comprehensive data set characterizing and quantifying two types of mineral defects in the most abundant mineral of Earth's upper mantle: olivine. Namely, we investigate translation defects of dislocation and rotation defects, called disclinations, in polycrystalline olivine deformed in uniaxial compression or torsion, at high temperature and pressure. The defects are identified via mapping of the crystallographic disorientation detected using electron backscatter diffraction.

To learn more:

S. Demouchy, M. Thieme, F. Barou, B. Beausir, V. Taupin, P. Cordier (2023) Dislocation and disclination densities in experimentally deformed polycrystalline olivine. European Journal of Mineralogy, 35, 219–242, https://doi.org/10.5194/ejm-35-219-2023