The problem of shearing along axial plane foliations |
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| Authors: | SK Ghosh |
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| Institution: | Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India |
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| Abstract: | The structural significance of axial plane foliations cannot be understood unless we make a distinction between rotation of the material plane foliation and rotation of the geometrically defined XY-plane of the strain ellipsoid. If the foliation rotates as a material plane at any stage of deformation, then its final orientation will be different from that of the XY-plane. It is suggested that reorientation of foliation takes place by some combination of the formation of foliation (e.g. recrystallization) along the XY-plane and passive rotation of the material plane foliation in the same continuous deformation. The deviation between the foliation and the XY-plane is then much less than 5 degrees. However, because of this deviation, a considerable amount of shear strain may develop along the foliation. The analysis, thus, explains how a foliation can be approximately parallel to the XY-plane and yet be a plane of shearing. |
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