Strongly deformed Archean sandstones and conglomerates in northwestern Ontario show extreme heterogeneity of strain, with pebbles deformed more than feldspar grains, which are more deformed than quartz grains. Despite the heterogeneous changes of shape, particulate flow has preserved a strong preferred grain orientation and the magnetic susceptibility ellipsoid usually still tracks the orientations of the principal strains.
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Borradaile et al. (1984) studied this question.
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