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<publisher>HAL CCSD</publisher>
<title lang=en>Thermal maturation and exhumation of a middle orogenic crust in the Livradois area (French Massif Central)</title>
<creator>Gardien, Veronique</creator>
<creator>Vanderhaeghe, Olivier</creator>
<creator>Arnaud, Nicolas</creator>
<creator>Cocherie, Alain</creator>
<creator>Grange, Marion</creator>
<creator>Lecuyer, Christophe</creator>
<contributor>Paléoenvironnement et paléobiosphère (PP) ; Université Claude Bernard Lyon 1 (UCBL) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géologie et gestion des ressources minérales et énergétiques (G2R) ; Université Henri Poincaré - Nancy 1 (UHP) - Institut National Polytechnique de Lorraine (INPL) - Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Dynamique de la Lithosphere ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)</contributor>
<source>EISSN: 1777-5817</source>
<source>Bulletin de la Société Géologique de France</source>
<publisher>Société géologique de France</publisher>
<identifier>hal-00617429</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00617429</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00617429</source>
<source>Bulletin de la Société Géologique de France, Société géologique de France, 2011, 182 (1), pp.5-24. 〈10.2113/gssgfbull.182.1.5〉</source>
<identifier>DOI : 10.2113/gssgfbull.182.1.5</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.2113/gssgfbull.182.1.5</relation>
<language>en</language>
<subject lang=en>U-Pb and Ar-40/Ar-39 dating</subject>
<subject lang=en>Thermobarometry</subject>
<subject lang=en>Migmatisation</subject>
<subject lang=en>Extrusion</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Upper Carboniferous heating and melting of the middle orogenic crust associated with the emplacement of syntectonic granitoids are documented in the Upper Gneissic Unit of the Livradois area (central part of the French Massif Central). Crustal melting post-dates peak metamorphism conditions (800-625 degrees C, 10-8 kb) dated at 360 +/- 4 Ma (U-Th-Pb on monazite). The P-T evolution of the metamorphic series indicates that Barrovian metamorphism was followed by a decompression (from 10 +/- 1 kbar to 6 +/- 1 kbar) associated with either a decrease in temperature in the southern part of the series or with an increase in temperature (of about 150 degrees C) in the northern part of the series. This evolution records the first step of the exhumation of the series coeval with granitoids intrusion, of which the emplacements were dated at 315 +/- 4 and 311 +/- 18 Ma (U-Pb on zircon). The final stage of the exhumation is associated with an isobaric cooling of the whole series. Similarity of Ar-40/Ar-39 ages for biotite in the paragneisses (307-300 Ma) and K-feldspar in the granitoids (306-300 Ma) document rapid cooling for this stage. Moreover dextral reverse mylonites, at the border and the northern part of the metamorphic series indicate north-south compression coeval with the unroofing of the series. Youngest Ar-40-Ar-39 ages on K-feldspar (274.6 +/- 5 Ma) combined with normal shearing in mylonites limiting the Carboniferous Brassac-les-Mines basin document the late Carboniferous-early Permian stage of extension coeval with the upwelling of the Velay granitic dome.</description>
<date>2011</date>
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