Abstract

Preferred orientations of olivine have been produced by syntectonic recrystallization in dunite samples that have been deformed moderately in a general stress field at high temperatures and pressures: X-olivine maxima (X = [010]) developed parallel to σ1 and Z-olivine maxima (Z = [100]) developed parallel to σ3. Similar fabrics are expected to form by mechanical rotation due to translation gliding on (010)[100], but much larger strains are required. The experimental results indicate that the orientation patterns are caused by preferred growth of newly formed nuclei that have low coefficients of resolved shear stress for slip on (010)[100].

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