Abstract
Naturally deformed Mg-rich orthopyroxenes ((Mg, Fe) 2Si 2O 6), deformed at a temperature of 500–600°C and a pressure of 5–9 kbar, have been studied using optical and transmission electron microscopy techniques. Optical and universal-stage measurements reveal well-ordered, deformation-induced subgrain boundaries (sub)parallel to (100), (010) and (001) with an angular mismatch of 3–12° between adjacent subgrains. Transmission electron microscopy shows free dislocations, (isolated) (100) -stacking faults (with R = 1 4 [001] ), tilt walls parallel to (001) and more complex dislocation configurations. All dislocations have Burgers vector b = [001] . The dominant slip system is (100)[001] with subordinate (010)[001] and dissociation of unit 〈 c〉 dislocations takes place in (100) and (010). A comparison of the optical and TEM data indicates that the optically visible subgrain boundaries parallel to [001] remain unexplained.
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