Observations of grain size sensitive power law creep of olivine aggregates over a large range of lattice‐preferred orientation strength

Grain size sensitive (GSS) power law creep of San Carlos olivine aggregates was investigated by comparing strain rates measured in laboratory deformation experiments to strain rates determined from a micromechanical model of intragranular dislocation processes. The plastic flow behavior of olivine a...

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Bibliographic Details
Published in:Journal of geophysical research. Solid earth 2016-02, Vol.121 (2), p.506-516
Main Authors: Tielke, Jacob A., Hansen, Lars N., Tasaka, Miki, Meyers, Cameron, Zimmerman, Mark E., Kohlstedt, David L.
Format: Article
Language:English
Subjects:
Aggregates
Alloys
Axial strain
Backscatter
Compression
Creep (materials)
Crystals
Deformation
Diffraction
Diffusion
Dislocations
Dye dispersion
Electron backscatter diffraction
Geophysics
Grain boundary sliding
Grain size
LPO
mantle
Mathematical models
Olivine
Particle size
Plastic flow
Plastics
Power law
Preferred orientation
rheology
Shear strain
Single crystals
Slip
Solifluction
Strain
Strain rate
Strength
Torsion
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Summary:Grain size sensitive (GSS) power law creep of San Carlos olivine aggregates was investigated by comparing strain rates measured in laboratory deformation experiments to strain rates determined from a micromechanical model of intragranular dislocation processes. The plastic flow behavior of olivine aggregates due solely to intragranular slip was determined using flow laws for olivine single crystals in combination with grain orientations measured by electron backscatter diffraction. Measured strain rates were compared to results from the micromechanical model for samples deformed in compression to an axial strain of
ISSN:2169-9313
2169-9356
DOI:10.1002/2015JB012302