Discussion: Relationship between foliation and strain |
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The mechanism proposed here will produce a foliation that rotates progressively towards the principal plane of finite strain defined by the maximum and intermediate elongations. Where the axial plane foliation is defined by symmetrical crenulations it will be truly parallel to the principal plane and will have tracked that plane during development of the foliation. This would be the situation in a fold hinge.
Wherever the foliation is defined by asymmetrical crenulations and there has been non coaxiality of deformation, the foliation will not have tracked the principal plane and will not be truly parallel to that plane. Lack of symmetry across domain boundaries, in the strain experienced by M (shear parallel to Si) and Q (extension perpendicular to Si) domains, requires that the strain on the scale of multiple domains have a component of shear parallel to the domain boundaries (S2i). The greater the degree of non coaxiality the greater the possible discrepancy in orientation between the foliation and the principal plane of strain on the scale of a fold limb. |
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