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Grain-sizereductionmechanisms and rheologicalconsequences in high-temperaturegabbromylonites of Hidaka, Japan

Abstract : The study of microstructures and crystallographic fabrics in a granulite-facies shear zone of the Hidaka Metamorphic Belt showed that the strong shearing localized within the mylonite resulted in the asymmetrical elongation of the inherited orthopyroxene porphyroclasts and the generation of fine-grained plagioclase and orthopyroxene layers as asymmetric tails of orthopyroxene porphyroclasts. The orthopyroxene porphyroclasts and the coarse plagioclase matrix surrounding them have a strong crystallographic preferred orientation acquired through deformation by dislocation creep. In contrast, the small orthopyroxene and plagioclase grains located in the tails have equant shapes and random fabric that are interpreted as the result of deformation by grain-boundary sliding. The small orthopyroxene grains are generated on the sheared rims of the orthopyroxene porphyroclasts by subgrain rotation, inheriting the orientation of the porphyroclasts before deforming by grain-boundary sliding (GBS) and losing this fabric. Additional mechanism of grain-sizereduction is the disruption of orthopyroxene porphyroclasts by synthetic shear zones localized on clinopyroxene exsolutions. The switch in deformation mechanism from dislocation creep to GBS, associated with the grain-sizereduction, yielded estimates of deviatoric stress one order smaller than lithostatic pressure. Besides, such rheological evolution attests of the mechanical softening during deformation, which contributed to the localization of the strain within the mylonite.
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Hugues Raimbourg, Tsuyoshi Toyoshima, Yuta Harima, Gaku Kimura. Grain-sizereductionmechanisms and rheologicalconsequences in high-temperaturegabbromylonites of Hidaka, Japan. Earth and Planetary Science Letters, Elsevier, 2008, 267 (3-4), pp.637-653. ⟨10.1016/j.epsl.2007.12.012⟩. ⟨insu-00756068⟩

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