Alpine tectonics in the Calabrian–Peloritan belt (southern Italy): New 40Ar/39Ar data in the Aspromonte Massif area |
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| Authors: | Thomas Heymes Patrick Monié Nicolas Arnaud Arnaud Pêcher Jean-Pierre Bouillin Roberto Compagnoni |
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| Institution: | 1. Department of Physical Sciences, Earth and Environment, University of Siena, Italy;2. Institute of Geoscience and Earth Resources, National Research Council, Pisa, Italy;3. Department of Earth and Geoenvironmental Sciences, University of Bari, Italy;4. Department of Physics and Geology, University of Perugia, Italy;5. Earth Sciences Department, University of Florence, Italy;6. Earth Sciences Department, University of Pisa, Italy;7. Institute of Geoscience and Earth Resources, National Research Council, Firenze, Italy;8. Department of Science and High technology, University of Insubria, Como, Italy;1. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. Institute of Geophysics, Polish Academy of Sciences, Leading National Research Centre (KNOW), Warsaw, Poland;2. Institute of Geological Sciences, Polish Academy of Sciences, Warsaw, Poland;3. Strzelecki Energia Sp. z o. o., Warsaw, Poland;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Moscow State University, Leninskie Gory, Moscow, 119234, Russia;3. Kuzbassgiproshakht, ul. Ostrovskogo 34, Kemerovo, 650610, Russia |
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| Abstract: | This study provides new 40Ar/39Ar geochronological constraints on the age of the Alpine tectonics in the Aspromonte Massif (southern part of the Calabrian–Peloritan belt). This massif exposes the upper units of the Calabride Complex which originated from the European continental margin. The Calabride Complex was incorporated in the Alpine orogenic wedge and then integrated into the Apennines and Maghrebides fold-and-thrust belts. Throughout the Calabride Complex there is evidence for a two stage tectonic history, which remains however rather poorly dated: Alpine nappe stacking is followed by extensional reworking along the former thrust contacts or along new detachment surfaces. Our new ages suggest that exhumation of the uppermost units, which accompanied nappe stacking, probably started at 45 Ma and that the deepest units were almost completely exhumed at 33 Ma. This kinematics probably corresponds to syn-orogenic extension while the end of exhumation is clearly related to the extensional tectonics dated at 28.6 Ma along detachment structures.Our geochronological data reveal a very short lag time between accretional and extensional processes in this part of the Mediterranean Alpine orogenic belt. The direction of extension, when the units are restored to their initial position (i.e. before the opening of the Western Mediterranean basins and the bending of the arc) is NNE–SSW. Such a direction does not fit with the eastward slab-retreat model generally put forward to explain extension in the Western Mediterranean. In contrast, we provide evidence for roughly N–S middle Oligocene extension in the accretionary prism, not previously described in this part of the Mediterranean domain. |
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