The origin and development of kink‐bands in a foliated body

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Abstract
Although the deformation of foliated rocks by kink and glide mechanisms has been studied in detail in recent years, fundamental differences of opinion have emerged, particularly as a result of experimental work. Most theories concerning the relationship of kink‐bands to stress‐fields are empirically based. Evidence on whether kink‐bands are the result of a shear couple and on limiting factors for external rotation is presented. It is concluded that kink‐bands are zones of externally rotated foliation bounded by kink‐planes which develop parallel to planes of high shearing stress at infinitesimal strain.