Late-Orogenic Evolution of the Southern European Variscan Belt Constrained by Fabric Analysis and Dating of the Camarat Granitic Complex and Coeval Felsic Dykes (Maures–Tanneron Massif, SE France)
Anisotropy of magnetic susceptibility; Fabric analysis; Internal zones; Orogenic evolution; Permian; S.E. France; Stretching direction; Transpression; Variscan; Variscan belt; Geophysics; Geochemistry and Petrology
Abstract :
[en] The Camarat Granitic Complex (CGC), emplaced in the migmatitic Internal Zone of the Maures–Tanneron Massif (MTM), SE Variscides, consists of the Gigaro granodiorite and the composite Camarat granite. U-Pb dating of the latter gives crystallization ages of 304.5 ± 3.3 Ma (zircon date) and 303.5 ± 4.0 Ma (monazite date). Two representatives of late felsic dykes cutting across the MTM Internal Zone have 39Ar/40Ar muscovite ages of 302.43 ± 2.62 Ma and 298.11 ± 2.38. Magmatic lineations revealed by anisotropy of magnetic susceptibility (AMS) measurements and image analysis, aplite dykes, dyke-like bodies of cordierite microgranite and joints in the Camarat granite, as well as the late dykes all have orientations consistent with subhorizontal, NNE-SSW-trending lineations in the migmatitic country rocks representing the stretching direction of a late-Variscan transpression phase (D3). The CGC and the late dykes are therefore witness to a thermal event that affected the MTM between ∼305 and ∼298 Ma (late Pennsylvanian–earliest Permian times), at the end of D3 which initiated at ∼325 Ma. Grabens related to post-Variscan, Permian rifting (D4 phase), which cut across the MTM are WNW-ESE-trending, indicating a NNE-SSW direction of extension, parallel to the previous (D3) lateral horizontal flow. The present results and a comparison with AMS data published for the Corsica–Sardinia Batholith reveal that evolution in the SE Variscides from Devonian–early Carboniferous contraction to Permian extension, through late Carboniferous transpression is characterized by the persistence of a ca. N-S stretching direction, supporting a strong horizontal, orogen-parallel crustal flow.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Bolle, Olivier ; Université de Liège - ULiège > Département de géologie ; FNRS, Brussels, Belgium
Corsini, Michel; Université Côte d'Azur, IRD, CNRS, Observatoire de la Côte d'Azur, Valbonne, France
Diot, Hervé; UMR-CNRS 6112, Laboratoire de Planétologie et Géosciences, Université de Nantes, Nantes, France ; LASIE, Université de La Rochelle, La Rochelle, France
Laurent, Oscar ; Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique ; ETH Zürich, Department of Earth Sciences, Institute for Geochemistry and Petrology, Zürich, Switzerland ; Now at Géosciences Environnement Toulouse, UMR-CNRS 5563, Toulouse, France
Melis, Raphaël; Université Côte d'Azur, IRD, CNRS, Observatoire de la Côte d'Azur, Valbonne, France ; Now at LGL-TPE, UMR-CNRS 5276, Université Claude Bernard, Lyon 1, Villeurbanne, France
Language :
English
Title :
Late-Orogenic Evolution of the Southern European Variscan Belt Constrained by Fabric Analysis and Dating of the Camarat Granitic Complex and Coeval Felsic Dykes (Maures–Tanneron Massif, SE France)
Bernard Charlier is thanked for the SEM analysis and Michaël Mintrone for help during sample preparation for geochronology. Jean-Bernard Edel kindly made available to us his raw AMS data on the Corsica–Sardinia Batholith in N. Sardinia and Leonardo Casini enthusiastically commented on the petrology, structure and geochronology of that part of the batholith. We also acknowledge José R. Martínez Catalán, Jiří Žák, and Leonardo Casini for their insightful and constructive reviews that significantly helped to improve the original manuscript and Taylor Schildgen for careful editorial handling.
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