Grain-size reduction mechanisms and rheological consequences in high-temperature gabbro mylonites of Hidaka, Japan

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• 作者：Hugues Raimbourg ; Tsuyoshi Toyoshima ; Yuta Harima ; Gaku Kimura
• 关键词：EBSD ; grain-size reduction ; mylonite ; pyroxene ; grain boundary sliding ; dislocation creep
• 刊名：Earth and Planetary Science Letters
• 出版年：2008
• 出版时间：30 March 2008
• 年：2008
• 卷：267
• 期：3-4
• 页码：637-653
• 全文大小：3530 K

文摘

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-size reduction 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-size reduction, 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.