Olivine Deformation: To B Slip or Not to B Slip, That Is the Question
Year: 2025
Type: article
Abstract: When deformed by dislocation creep the dominant slip (Burgers) vectors of olivine dislocations are parallel to [100] or [001]. Dislocations with an [010] Burgers vector component (b dislocations) have been recorded rarely. Here we show an experimentally deformed olivine sample has a substantial population (17%) of b dislocations. Electron Backscatter Diffraction maps of crystal orientations provided information on dislocations from the orientation gradients. Maps show the b dislocations form subgrain walls like those formed by other dislocation types and are interpreted to form similarly by glide and climb, so b dislocations are mobile. To confirm our approach, we used Electron Backscatter Diffraction maps to select an area for Transmission Electron Microscopy imaging, down to an atomic scale image of a b dislocation. Our sample was deformed within range of subduction zone conditions; our approach can be used to investigate the scale and conditions of b slip in the mantle more widely.
Source: Geophysical Research Letters
DOI: 10.1029/2025gl117138
Institutions: University of Liverpool, University of Manchester
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,190
Awards: G2361145468, G2987222249, New direction in high temperature dielectrics: unlocking performance of doped tungsten bronze oxides through mechanistic understanding, Sir Henry Royce Institute - Manchester and NNL Equipment, Feedbacks between mineral reactions and mantle convection, Correlative Mapping of Crystal Orientation and Chemistry at the Nanoscale, Sir Henry Royce Institute - Manchester Build, The Royce: Capitalising on the investment, Aerosol Deposition for Manufacturing and Developing Next Generation Dielectric Charge Storage Devices, Sir Henry Royce InsStitute - recurrent grant
OpenAlex ID: W4417445354