Abstract
Pallasitic meteorites, as examples of samples derived from deep within their parent bodies, can provide information about conditions that existed within planetary interiors. Olivine crystal shape can be correlated with past deformation. Pallasites containing rounded olivines are free of kink bands and other evidence of plastic flow. Pallasites containing angular crystals, on the other hand, show a clear correlation between features of physical deformation, such as olivine crystal shape, size, degree of fracturing, and percentage of kink banded crystals. Pencil glide on the system {0kl} [100] is the predominant mechanism of plastic flow. Glide on this system in olivine indicates deformation at low strain rates and moderate to high temperatures. This occurred in the parent body while the pallasites were still deeply buried. According to petrofabric analyses, the parent fabrics of all pallasites studied are free of preferred orientations of olivine. Certain grains containing kink bands, however, do show preferred alignments. Kink banding in the pallasites is by a mechanism that is distinct from the shock-induced kinking of chondrites, achondrites, and mesosiderites.
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