Incremental deformation and fabric development in a KCl/mica mixture |
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| Authors: | WD Means PF Williams BE Hobbs |
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| Institution: | Department of Geological Sciences, State University of New York at Albany, Albany, NY 12222, U.S.A.;Department of Geology, University of New Brunswick, Fredericton, New Brunswick, Canada E3B5A3;Department of Earth Sciences, Monash University, Clayton, Victoria 3168, Australia |
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| Abstract: | The history of deformation and of mica reorientation is described in a KCl/mica mixture in the middle of a kink-like, experimental shear zone. The history was reconstructed by deforming several specimens to successively greater total strains and assuming the more deformed specimens passed through the states of strain and fabric exhibited by the less deformed specimens.A pseudo-differentiated layering is described which arises from the original network distribution of the mica grains, without benefit of any differentiation process. A comparison is made between the observed mica fabrics at various strains and those predicted by the March model, taking the measured initial preferred orientation of the micas into account. The actual reorientation processes in the material are found to be more efficient than the March transformation at shortening strains less than about 70% but less efficient at higher strains. These departures from Marchian behavior are explaned qualitatively. Comparison is also made between observed and predicted intensities of mica preferred orientation, assuming a hypothetical random orientation of micas in the starting material for the March calculation. |
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