Jan Tullis, Richard A. Yund; Dynamic recrystallization of feldspar: A mechanism for ductile shear zone formation. Geology ; 13 (4): 238–241. doi: https://doi.org/10.1130/0091-7613(1985)13<238:DROFAM>2.0.CO;2
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Feldspar aggregates experimentally deformed in the dislocation creep regime undergo dynamic recrystallization because recovery is difficult due to the limited climb of dislocations. Recrystallizing aggregates have a lower strength because of the cyclic production of small, strain-free grains, and they develop a strong preferred orientation, consistent with that observed in mylonites. Thus, recrystallization-accommodated dislocation creep may be responsible for the grain-size reduction and strain softening that lead to the formation of many mylonites and ductile shear zones.