Quartz and sheet-silicate preferred orientations of low symmetry, Pikikiruna Schist, New Zealand |
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| Authors: | David Shelley |
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| Abstract: | The Pikikiruna Schist of Nelson, New Zealand, displays a fabric in which the patterns of quartz c-axes, the poles to planes of inequidimensional quartz grains, and the statistical maxima of poles to sheet-silicate cleavages are oblique to each other. The quartz c-axes patterns consist of type-1 and type-2 crossed-girdles. The triclinic fabric can be explained in terms of one complex rotational deformation of an essentially plane strain nature. Rotation of approximately 90° about the intermediate strain-axis was combined at a late stage with subsidiary rotations about the extension axis. The quartz c-axes patterns can be related to the kinematic framework rather than the finite strain-axes. On the other hand, the dimensional quartz preferred orientation may be closely related to the finite strain-axes, though the quantity of strain can not be measured because of recrystallisation. |
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