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<datestamp>2018-01-11</datestamp>
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<title lang=en>Syntectonic crustal melting and high-grade metamorphism in a transpressional regime, Variscan Massif Central, France</title>
<creator>Gebelin, Aude</creator>
<creator>Roger, Francoise</creator>
<creator>Brunel, Maurice</creator>
<contributor>Institut für Geologie, Leibniz Universität Hannover ; Université du Québec</contributor>
<contributor>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)</contributor>
<source>ISSN: 0040-1951</source>
<source>EISSN: 1879-3266</source>
<source>Tectonophysics</source>
<publisher>Elsevier</publisher>
<identifier>hal-00445260</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00445260</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00445260</source>
<source>Tectonophysics, Elsevier, 2009, 477 (3-4), pp.229-243. 〈10.1016/j.tecto.2009.03.022〉</source>
<identifier>DOI : 10.1016/j.tecto.2009.03.022</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2009.03.022</relation>
<language>en</language>
<subject lang=en>Crustal melting</subject>
<subject lang=en>High-grade metamorphism</subject>
<subject lang=en>Transpression</subject>
<subject lang=en>U/Pb dating</subject>
<subject lang=en>Variscan French Massif Central</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Hot collisional orogens are characterized by abundant syn-kinematic granitic magmatism that profoundly affects their tectono-thermal evolutions. Voluminous granitic magmas, emplaced between 360 and 270 Ma, played a visibly important role in the evolution of the Variscan Orogen. In the Limousin region (western Massif Central, France), syntectonic granite plutons are spatially associated with major strike-slip shear zones that merge to the northwest with the South Armorican Shear Zone. This region allowed us to assess the role of magmatism in a hot transpressional orogen. Microstructural data and U/Pb zircon and monazite ages from a mylonitic leucogranite indicate synkinematic emplacement in a dextral transpressional shear zone at 313 +/- 4 Ma. Leucogranites are coeval with cordierite-bearing migmatitic gneisses and vertical lenses of leucosome in strike-slip shear zones. We interpret U/Pb monazite ages of 315 +/- 4 Ma for the gneisses and 316 +/- 2 Ma for the leucosomes as the minimum age of high-grade metamorphism and migmatization respectively. These data suggest a spatial and temporal relationship between transpression, crustal melting, rapid exhumation and magma ascent, and cooling of high-grade metamorphic rocks.;Some granites emplaced in the strike-slip shear zone are bounded at their roof by low dip normal faults that strike N-S, perpendicular to the E-W trend of the belt. The abundant crustal magmatism provided a low-viscosity zone that enhanced Variscan orogenic collapse during continued transpression, inducing the development of normal faults in the transpression zone and thrust faults at the front of the collapsed orogen.</description>
<date>2009</date>
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