Syntectonic crustal melting and high-grade metamorphism in a transpressional regime, Variscan Massif Central, France
dc.contributor.author | Gébelin, A | en |
dc.contributor.author | Roger, F | en |
dc.contributor.author | Brunel, M | en |
dc.date.accessioned | 2017-03-14T15:29:51Z | |
dc.date.available | 2017-03-14T15:29:51Z | |
dc.date.issued | 2009-11-15 | en |
dc.identifier.issn | 0040-1951 | en |
dc.identifier.uri | http://hdl.handle.net/10026.1/8623 | |
dc.description.abstract |
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. © 2009 Elsevier B.V. All rights reserved. | en |
dc.format.extent | 229 - 243 | en |
dc.language.iso | en | en |
dc.title | Syntectonic crustal melting and high-grade metamorphism in a transpressional regime, Variscan Massif Central, France | en |
dc.type | Journal Article | |
plymouth.issue | 3-4 | en |
plymouth.volume | 477 | en |
plymouth.publication-status | Published | en |
plymouth.journal | Tectonophysics | en |
dc.identifier.doi | 10.1016/j.tecto.2009.03.022 | en |
plymouth.organisational-group | /Plymouth | |
plymouth.organisational-group | /Plymouth/Faculty of Science and Engineering | |
plymouth.organisational-group | /Plymouth/REF 2021 Researchers by UoA | |
plymouth.organisational-group | /Plymouth/REF 2021 Researchers by UoA/UoA07 Earth Systems and Environmental Sciences | |
dc.rights.embargoperiod | Not known | en |
rioxxterms.versionofrecord | 10.1016/j.tecto.2009.03.022 | en |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | en |
rioxxterms.type | Journal Article/Review | en |