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<datestamp>2018-01-11</datestamp>
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<title lang=en>Timing and duration of partial melting and magmatism in the Variscan Montagne Noire gneiss dome (French Massif Central)</title>
<creator>TRAP, P.</creator>
<creator>ROGER, Francoise</creator>
<creator>CENKI-TOK, Benedicte</creator>
<creator>Paquette, Jean-Louis</creator>
<contributor>Laboratoire Chrono-environnement (LCE) ; Université Bourgogne Franche-Comté (UBFC) - Université de Franche-Comté (UFC) - Centre National de la Recherche Scientifique (CNRS)</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>
<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>Laboratoire Magmas et Volcans (LMV-ENSMSE) ; École des Mines de Saint-Étienne (Mines Saint-Étienne MSE) ; Institut Mines-Télécom [Paris] - Institut Mines-Télécom [Paris] - SPIN - Centre National de la Recherche Scientifique (CNRS) - Laboratoire Magmas et Volcans (LMV) ; Université Jean Monnet [Saint-Étienne] (UJM) - Institut de Recherche pour le Développement et la société - Université Clermont Auvergne (UCA) - Centre National de la Recherche Scientifique (CNRS) - Université Jean Monnet [Saint-Étienne] (UJM) - Institut de Recherche pour le Développement et la société - Université Clermont Auvergne (UCA)</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>hal-01526942</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01526942</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01526942</source>
<source>International Journal of Earth Sciences, Springer Verlag, 2017, 106 (2), pp.453-476. 〈10.1007/s00531-016-1417-x〉</source>
<identifier>DOI : 10.1007/s00531-016-1417-x</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00531-016-1417-x</relation>
<language>en</language>
<subject lang=en>Partial melting</subject>
<subject lang=en>Migmatite</subject>
<subject lang=en>Magmatism</subject>
<subject lang=en>Variscan orogeny</subject>
<subject lang=en>Gneiss dome</subject>
<subject lang=en>LA-ICP-MS U-Th-Pb dating</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Unravelling the detailed pressure–temperature–time-deformation (P–T–t-D) evolution of magmatic and metamorphic rocks provides essential insights into the timing and duration of partial melting and related plutonism during crustal flow and migmatitic dome formation. The Montagne Noire Axial Zone (MNAZ) is a migmatitic dome located within the Variscan orogen in the southern French Massif Central. The timing of the main thermal event that was responsible for intense partial melting is still highly debated. In this study we present new laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) age data on micaschists, migmatites and granites that clarify the P–T–t-D evolution of the MNAZ. Structurally controlled samples were collected in order to constrain the timing of metamorphism, migmatization and plutonism regarding the main structural pattern D1, D2 and D3. D1 and D2 correspond to nappe stacking and dextral transpression, respectively. D3 is related to vertical shortening and coaxial thinning with a preferential NE–SW- to E–W-directed stretching. LA-ICP-MS analyses on the syntectonic Anglès, Soulié and Martys granites yielded U–Th/Pb monazite ages of 305 ± 1.5, 306 ± 1.9 and 314 ± 2 Ma, respectively. Five migmatitic rocks sampled in the eastern and central Espinouse area yielded in situ ages ranging between 312 ± 2 and 301 ± 2 Ma. Along the dome envelope, two garnet–staurolite-bearing micaschists near Saint-Pons-de-Thomières village gave in situ U–Th–Pb ages of 312.1 ± 2.1 and 309.0 ± 3.1 Ma. A fine-grained gneiss with a D3 fabrics in the eastern dome envelope yield a 208Pb/232Th mean age at 305.7 ± 3.9 Ma. All ages obtained in this study for the micaschists, migmatites and granites range between 315 and 301 Ma. We interpret this time span as the record of the high thermal event responsible for intense crustal partial melting within the lower and middle crust. The onset of partial melting occurred at ca. 315 Ma that marked the beginning of transpressional deformation D2. Based on structural and petrological studies, our new U–Th–Pb results suggest that (1) partial melting may have started at ca. 315 Ma and lasted 15–10 Myr and (2) D2 et D3 developed between 315 and 300 Ma and were synchronous. D1 deformation ended at 315 Ma. The onset and duration of D1 related to nappe stacking and crustal thickening is still uncertain.</description>
<date>2017-03</date>
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