Minerals, Volume 14, Issue 3
March 2024 - 119 articles
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Cover Story: A high-quality phase-orientation map of mylonite obtained by electron backscattered diffraction showed a wide range of quartz–plagioclase mixing (10%–80% in the quartz modal composition) and indicated a change in the deformation mechanism of quartz from dislocation creep in quartz-rich layers to grain-size-sensitive creep in the mixed-quartz-plagioclase layers, whereas that of plagioclase was predominantly grain-size-sensitive creep. Our results show that the Kashio shear zone could have developed under deformation mechanisms in which the viscosities of quartz and plagioclase are nearly comparable, effectively within 1017–1019 Pa·s, thereby possibly enabling extensive shearing along the Median Tectonic Line. The Effect of Low-Viscosity Contrast between Felsic Minerals on Creep Behavior. View this paper