Observed differences in c-axis fabrics between quartz porphyroclasts and recrystallized quartz from the same quartzite samples suggest some changes in the fabric-forming parameters during deformation. The fabric patterns are consistent with a change in the incremental strain history from flattening to constriction during duplex development, which is supported by the observed overprinting of structures in the field.
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Acknowledgements--The authors would like to thank Graham Price and Rob Knipe for many useful comments in their reviews. Support from NSF Grant EAR-8720755 and a McKnight-Land Grant Professorship to C. Teyssier, and from the University of Minnesota Graduate School to D. Kirschner are gratefully acknowledged.