3D geometrical modelling of post-foliation deformations in metamorphic terrains (Syros,Cyclades, Greece) |
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| Institution: | 1. Université des Antilles, Géosciences Montpellier, UMR 5243, Campus de Fouillole, 97120 Pointe à Pitre, France;2. Université Rennes 1, Géosciences Rennes, bat. 15 – Campus de Beaulieu, 263 Av du général Leclerc, BP 74205, 35042 Rennes Cedex, France;3. Université de Montpellier, Géosciences Montpellier, UMR CNRS 5243, Campus Triolet, Place E. Bataillon, 34000 Montpellier, France;4. GeoRessources, Université de Lorraine/CNRS/CREGU. ENSG, 2 rue du Doyen Marcel Roubault Vandoeuvre-lès-Nancy F-54518, France;1. Institute of Geological Sciences, University of Bern, CH-3012, Switzerland;2. School of Petroleum Engineering, The University of New South Wales, NSW 2052, Australia;3. CSIRO, NSW 2113, Australia;4. School of Civil and Resource Engineering, The University of Western Australia, WA 6009, Australia;1. College of Earth Sciences, Jilin University, Jianshe Str. 2199, 13006 Changchun, Jilin, China;2. Department of Geography and Geology, University of Salzburg, Hellbrunner Str. 34, A-5020 Salzburg, Austria;3. Planetary Science Institute, Faculty of Earth Sciences, China University of Geosciences (Wuhan), Wuhan, Hubei, China;1. State Key Laboratory of Geological Processes and Mineral Resources and Institute of Earth Sciences, China University of Geosciences, Beijing 100083, PR China;2. CSIRO Earth Science and Resource Engineering, PO Box 1130, Bentley, WA 6102, Australia;3. School of Earth and Environment, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;4. Department of Applied Geology, Curtin University, Bentley, WA 6845, Australia;5. Department of Geosciences, National Taiwan University, Taipei 106, Taiwan;6. Geological Survey of Norway-NGU, 7491 Trondheim, Norway;7. Department of Geology and Mineral Resources Engineering, Norwegian University of Science and Technology-NTNU, 7491 Trondheim, Norway;1. Department of Earth Science, University of California, Santa Barbara, CA 93106-9630, USA;2. Earth and Environmental Sciences, IKBSAS, University of British Columbia Okanagan, 3333 University Way, Kelowna, BC V1V 1V7, Canada;3. Geological Survey of Canada, 601 Booth St., Ottawa, Ontario K1A 0E8, Canada;1. Department of Geology, University of Patras, GR-26500, Patras, Greece;2. School of Geosciences, The University of Sydney, NSW 2006, Sydney, Australia;3. Geotop, Université du Québec à Montréal, H2X 3Y7, Montréal, Canada;4. Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA 02467, USA;5. Department of Earth Sciences, University of Minnesota, Minnesota, USA |
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| Abstract: | Superposed to ductile syn-metamorphic deformations, post-foliation deformations affect metamorphic units during their exhumation. Understanding the role of such deformations in the structuration of metamorphic units is key for understanding the tectonic evolution of convergence zones. We characterize post-foliations deformations using 3D modelling which is a first-order tool to describe complex geological structures, but a challenging task where based only on surface data. We propose a modelling procedure that combines fast draft models (interpolation of orientation data), with more complex ones where the structural context is better understood (implicit modelling), allowing us to build a 3D geometrical model of Syros Island blueschists (Cyclades), based on field data. With our approach, the 3D model is able to capture the complex present-day geometry of the island, mainly controlled by the superposition of three types of post-metamorphic deformations affecting the original metamorphic pile: i) a top-to-South ramp-flat extensional system that dominates the overall island structure, ii) large-scale folding of the metamorphic units associated with ramp-flat extensional system, and iii) steeply-dipping normal faults trending dominantly NNW-SSE and EW. The 3D surfaces produced by this method match outcrop data, are geologically consistent, and provide reasonable estimates of geological structures in poorly constrained areas. |
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| Keywords: | 3D geometrical modeling Post-foliation deformations HP metamorphic terrains Cycladic blueschists unit |
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