Abstract
Kink bands (KBs) and kink band boundaries (KBBs) in naturally deformed orthopyroxene have been studied by optical and transmission electron microscopy. The KBs are in general not simple and symmetrical and have features characteristic of both ideal kink bands (as defined by Orowan, 1942) and deformation bands (as defined by Mott, 1952). Two closely-related mechanisms (which involve the pile-up of dislocations belonging to a single slip system) are proposed for the development of the observed KBs. The KBBs are also complex structures up to 4 µm wide consisting of a very fine-grained (essentially amorphous) alteration product and discrete grains of orthopyroxene. However, there is evidence that originally the KBBs consisted of a high local density (of the order of 10¹¹ cm⁻²) of piled-up dislocations. The KBBs are, therefore, likely sites for alteration and recrystallization.
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