Relation between the Gondwanide Orogen and contemporaneous intracratonic deformation |
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| Institution: | 1. Council for Geoscience, P.O. Box 572, Bellville 7535, South Africa;2. Department of Ecosystem and Landscape Dynamics, Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands;3. Evolutionary Studies Institute and School of Geosciences, University of the Witwatersrand, Private Bag 3, WITS, 2050, South Africa;1. Université Clermont Auvergne, 49, bd François-Mitterrand CS 60032 63001 Clermont-Ferrand Cedex 1;2. Laboratoire Magmas et Volcans, BP 10448, 63000 Clermont-Ferrand, France;3. CNRS, UMR 6524, IRD, R 163, LMV, 6 Avenue Blaise Pascal TSA 60026, CS 60026, 63178 Aubiere Cedex, France;4. Université de Montpellier, CNRS, Université des Antilles, UMR 5243 Géosciences Montpellier, 34095 Montpellier Cedex 05, France;5. Bureau de Recherche Géologique et Minière (BRGM), UMR 7327, 3 avenue Claude Guillemin, BP 36009, 45060 Orléans Cedex 2, France |
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| Abstract: | A causal relationship between collisional processes in the Permo-Triassic Gondwanide Orogen and intracratonic deformation of a compressional, strike-slip and extensional nature, was suggested in the literature. In this paper available data are reviewed to test this model. It appears that the balance of evidence favours a Gondwanide Orogeny produced in a compressional back-arc setting, rather than by major collision. A possible cause for the deformation under relatively low-grade metamorphic circumstances is flat slab subduction. An important dextral strike-slip component may result from oblique subduction. The contemporaneous intracratonic deformation with similar orientation of principal stress axes may be related to the same flat slab subduction processes and/or orogen parallel shear, but was probably not a direct consequence of collision. |
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