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Grain‐size sensitive rheology of orthopyroxene
Author(s) -
Bruijn Rolf H.C.,
Skemer Philip
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl060607
Subject(s) - creep , dislocation creep , diffusion creep , grain boundary , rheology , grain size , dislocation , deformation mechanism , geology , deformation (meteorology) , grain boundary diffusion coefficient , grain boundary strengthening , materials science , mechanics , microstructure , composite material , physics
The grain‐size sensitive rheology of orthopyroxene is investigated using data from rheological and microstructural studies. A deformation mechanism map is constructed assuming that orthopyroxene deforms by two independent mechanisms: dislocation creep and diffusion creep. The field boundary between these mechanisms is defined using two approaches. First, experimental data from Lawlis (1998), which show a deviation from non‐linear power law behavior at low stresses, are used to prescribe the location of the field boundary. Second, a new orthopyroxene grain‐size piezometer is used as a microstructural constraint to the field boundary. At constant temperature, both approaches yield sub‐parallel field boundaries, separated in grain size by a factor of only 2–5. Extrapolating to lithospheric conditions, the deformation mechanism transition occurs at a grain size of ~150–500 µm, consistent with observations from nature. As the transition from dislocation to diffusion creep may promote shear localization, grain‐size reduction of orthopyroxene may play a prominent role in plate‐boundary deformation.