Fabric asymmetry and shear sense in movement zones |
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| Authors: | J L Bouchez G S Lister A Nicolas |
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| Institution: | 1. Laboratoire de Tectonophysique, University of Nantes, 2 Ch. de la Houssinière, 44072, Nantes, France
2. Department of Structural Geology, Institute for Earth Sciences, University of Utrecht, The Uithof, 3508 TA, Utrecht, The Netherlands
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| Abstract: | Asymmetry between lattice preferred orientation and shape fabrics is commonly observed in microstructural studies of many deformed mineral aggregates (e. g. ice, carbonate rocks, peridotites and quartzites). Theoretical predictions are limited by the nature of the models available and more can be gained by discussion of the mechanisms which give rise to such asymmetry in specific natural and experimental situations. Asymmetry is often related to the sense of shear but there are other factors to be considered as well. It is concluded that fabric asymmetry can be a useful tool for the analysis of flow regimes in naturally deformed rocks, as long as the conditions prerequisite to successful application of this technique can be shown to have existed, and cognizance is taken of the limitations of the technique. |
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