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ODFTEX: A continuum model for texture evolution with dynamic recrystallization
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DOI：10.1093/gji/ggag170.png)
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Abstract
En 中文
We present a new method, ODFTEX, for calculating evolving crystal preferred orientation (CPO) in deforming aggregates of olivine plus orthopyroxene undergoing dynamic recrystallization. The model is based on a continuum description of texture in terms of the orientation distribution function (ODF), which satisfies an evolution equation that we solve numerically. The model thus delivers the ODF directly, rather than a collection of grain orientations like most alternative models. Recrystallization is represented by a source term in the evolution equation, defined in such a way that crystals poorly oriented for slip recrystallize most rapidly. The model has only a single free parameter, the recrystallization rate, which we calibrate against a laboratory experiment on an olivine aggregate deformed in simple shear. We illustrate the predictive power of ODFTEX by using it to calculate evolving CPO along pathlines in a two-dimensional convective flow and a three-dimensional subduction zone flow. ODFTEX is computationally about 6-7 times faster than the D-Rex model of Kaminski et al.(2004).
Keywords:
texture evolution
dynamic recrystallization
crystal preferred orientation
orientation distribution function
continuum model
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2.7
Papers:
862
Citations:
3.5W
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