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<title lang=en>Relationships between magmatism and extension along the Autun-La Serre fault system in the Variscan Belt of the eastern French Massif Central</title>
<creator>Choulet, Flavien</creator>
<creator>Faure, Michel</creator>
<creator>Fabbri, Olivier</creator>
<creator>Monié, Patrick</creator>
<contributor>Institut des Sciences de la Terre d'Orléans (ISTO) ; Institut national des sciences de l'Univers (INSU - CNRS) - Université d'Orléans (UO) - Université François Rabelais - Tours - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Chrono-environnement (LCE) ; Université Bourgogne Franche-Comté (UBFC) - Centre National de la Recherche Scientifique (CNRS) - Université de Franche-Comté (UFC)</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>
<description>International audience</description>
<source>ISSN: 1437-3254</source>
<source>EISSN: 1437-3262</source>
<source>International Journal of Earth Sciences</source>
<publisher>Springer Verlag</publisher>
<identifier>insu-00596918</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00596918</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00596918/document</identifier>
<identifier>https://hal-insu.archives-ouvertes.fr/insu-00596918/file/Article_Morvan_v_INIST.pdf</identifier>
<source>https://hal-insu.archives-ouvertes.fr/insu-00596918</source>
<source>International Journal of Earth Sciences, Springer Verlag, 2012, 101 (2), pp.393-413. 〈10.1007/s00531-011-0673-z〉</source>
<identifier>DOI : 10.1007/s00531-011-0673-z</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-011-0673-z</relation>
<language>en</language>
<subject lang=en>Synkinematic granite</subject>
<subject lang=en>French Massif Central</subject>
<subject lang=en>Quartz c-axis</subject>
<subject lang=en>40Ar-39Ar dating</subject>
<subject lang=en>Electron microprobe monazite dating</subject>
<subject lang=en>Late Carboniferous shear zones</subject>
<subject lang=en>Variscan Belt</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>The ENE-WSW Autun Shear Zone in the northeastern part of the French Massif Central has been interpreted previously as a dextral wrench fault. New field observations and microstructural analyses document a NE-SW stretching lineation that indicates normal dextral motions along this shear zone. Further east, similar structures are observed along the La Serre Shear Zone. In both areas, a strain gradient from leucogranites with a weak preferred orientation to highly sheared mylonites supports a continuous Autun-La Serre fault system. Microstructural observations, and shape and lattice-preferred orientation document high-temperature deformation and magmatic fabrics in the Autun and La Serre granites, whereas low- to intermediate-temperature fabrics characterize the mylonitic granite. Electron microprobe monazite geochronology of the Autun and La Serre granites yields a ca. 320 Ma age for pluton emplacement, while mica 40Ar-39Ar datings of the Autun granite yield plateau ages from 305 to 300 Ma. The ca. 300 Ma 40Ar-39Ar ages, obtained on micas from Autun and La Serre mylonites, indicate the time of the mylonitization. The ca. 15-Ma time gap between pluton emplacement and deformation along the Autun-La Serre fault system argue against a synkinematic pluton emplacement during late orogenic to postorogenic extension of the Variscan Belt. A ductile to brittle continuum of deformation is observed along the shear zone, with Lower Permian brittle faults controlling the development of sedimentary basins. These results suggest a two-stage Late Carboniferous extension in the northeastern French Massif Central, with regional crustal melting and emplacement of the Autun and La Serre leucogranites around 320 Ma, followed, at 305-295 Ma, by ductile shearing, normal brittle faulting, and subsequent exhumation along the Autun-La Serre transtensional fault system.</description>
<date>2012</date>
</dc>
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