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Exhumation processes during post-collisional stage in the Variscan belt revealed by detailed 40Ar/39Ar study (Tanneron Massif, SE France)

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Abstract

Detailed 40Ar/39Ar geochronology on single grains of muscovite was performed in the Variscan Tanneron Massif (SE France) to determine the precise timing of the post-collisional exhumation processes. Thirty-two plateau ages, obtained on metamorphic and magmatic rocks sampled along an east–west transect through the massif, vary from 302 ± 2 to 321 ± 2 Ma, and reveal a heterogeneous exhumation of the lower crust that lasted about 20 Ma during late Carboniferous. In the eastern part of the massif, the closure of the K–Ar isotopic system is at 311–315 Ma, whereas in the middle part of the massif it closes earlier at 317–321 Ma. These cooling paths are likely to be the result of differential exhumation processes of distinct crustal blocks controlled by a major ductile fault, the La Moure fault that separates both domains. In the western part of the massif, the ages decrease from 318 to 303 Ma approaching the Rouet granite, which provides the youngest age at 303.6 ± 1.2 Ma. This age distribution can be explained by the occurrence of a thermal structure spatially associated to the magmatic complex. These ages argue in favour of a cooling of the magmatic body at around 15 Ma after the country rocks in the western Tanneron. The emplacement of the Rouet granite in the core of an antiform is responsible for recrystallization and post-isotopic closure disturbances of the K–Ar chronometer in the muscovite from the host rocks. These new 40Ar/39Ar ages clearly outline that at least two different processes may contribute to the exhumation of the lower crust in the later stage of collision. During the first stage between 320 and 310 Ma, the differential motion of tectonic blocks limited by ductile shear zones controls the post-collisional exhumation. This event could be related to orogen parallel shearing associated with crustal-scale strike-slip faults and regional folding. The final exhumation stages at around 300 Ma take place within the tectonic doming associated to magmatic intrusions in the core of antiformal structures. Local ductile to brittle normal faulting is coeval to Upper Carboniferous intracontinental basins opening.

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References

  • Alexandrov P, Ruffet G, Cheilletz A (2002) Muscovite recrystallization and saddle-shaped 40Ar/39Ar age spectra: example from the blond granite (Massif Central, France). Geochim Cosmochim Acta 66:1793–1807. doi:10.1016/S0016-7037(01)00895-X

    Article  Google Scholar 

  • Arthaud F, Matte P (1966) Contribution à l’étude des tectoniques superposées dans la chaîne hercynienne: étude microtectonique des séries métamorphiques du massif des Maures (Var). C R Acad Sci Paris 262:436–439

    Google Scholar 

  • Bard JP, Caruba C (1981) Les séries leptyno-amphiboliques à éclogites relictuelles et serpentinites des Maures, marqueurs d’une paléosuture varisque affectant une croûte amincie? C R Acad Sci Paris 292:611–614

    Google Scholar 

  • Bard JP, Caruba C (1982) Texture et mineralogy d’une eclogite à disthène–saphirine–hyperstène–quartz en inclusion dans les gneiss migmatitites des Cavalières, massif de Ste Maxime (Maures, Var, France). C R Acad Sci Paris 294:103–106

    Google Scholar 

  • Basso AM (1985) Le Carbonifère de Basse Provence (Sud–Est de la France). Doctorate thesis, University Aix-Marseille 1, France, p 319

  • Bellot JP, Bronner G, Laverne C (2000) Finite strain analysis and signification of ultramafic lenses from the Western Maures (SE France). Geodynamic implications. C R Acad Sci Paris 331:803–809

    Google Scholar 

  • Bellot JP, Bronner G, Marchand J, Laverne C, Triboulet C (2002) Thrust and normal faulting in the Western Maures (SE France): evidence for geometric, kinematics and thermobarometry of the Cavalaire shear zone. Geol Fr 1:21–37

    Google Scholar 

  • Bellot JP, Triboulet C, Laverne C, Bronner G (2003) Evidence for two burial/exhumation stages during the evolution of the Variscan belt, as exemplified by P-T-t-d paths of metabasites in distinct allochtonous units of the Maures Massif (SE France). Int J Earth Sci 92:7–26

    Google Scholar 

  • Bouloton J, Goncalves P, Pin C (1998) Le pointement de péridotite à grenat-spinelle de La Croix-Valmer (Maures centrales): un cumulat d’affinité océanique impliqué dans la subduction éohercynienne? C R Acad Sci Paris 326:473–477

    Google Scholar 

  • Burg JP, Podladchikov Y (1999) Lithospheric scale folding: numerical modeling and application to the Himalayan syntaxis. Int J Earth Sci 88:190–200. doi:10.1007/s005310050259

    Article  Google Scholar 

  • Burg JP, Van den Driessche J, Brun JP (1994) Syn- to post-thickening extension in the Variscan belt of Western Europe: mode and structural consequences. Geol Fr 3:33–51

    Google Scholar 

  • Burg JP, Nievergelt P, Oberli F, Seward D, Davy P, Maurin JC, Zhizhong D, Meier M (1998) The Namche Barwa syntaxis: evidence for exhumation related to compressional crustal folding. J Asian Earth Sci 16:239–252. doi:10.1016/S0743-9547(98)00002-6

    Article  Google Scholar 

  • Buscail F (2000) Contribution à la compréhension du problème géologique et géodynamique du massif des Maures : le métamorphisme régional modélisé dans le système KFMASH : analyse paragénétique, chémiographie, thermobarométrie, géochronologie 40Ar/39Ar. Ph.D. thesis, University of Montpellier, France

  • Buscail F, Leyreloup AF (1999) The collisional regional metamorphism in the Maures and Tanneron (south of France) area. A critical review. EUG10 meeting, Strasbourg, France, 28 March–1 April, J Conf Abstr, Oxford

  • Caruba C (1983) Nouvelles données pétrographiques, minéralogiques et géochmiques sur le massif métamorphique hercynien des Maures (Var, France): comparaison avec les segments varisques voisins et essais d’interprétation géotectonique. Doctorate thesis, University of Nice, France

  • Castonguay S, Ruffet G, Tremblay A, Féraud G (2001) Tectonometamorphic evolution of the southern Quebec Appalachians: 40Ar/39Ar evidence for the Middle Ordovician crustal thickening and Silurian–early Devonian exhumation of the internal Humber zone. Geol Soc Am Bull 113:144–160. doi:10.1130/0016-7606(2001)113<0144:TEOTSQ>2.0.CO;2

    Article  Google Scholar 

  • Cheilletz A, Ruffet G, Marignac C, Kolli O, Gasquet D, Féraud G, Bouillin JP (1999) 40Ar/39Ar dating of shear zones in the Variscan basement of Greater Kabilia (Algeria). Evidence of an Eo-Alpine event at 128 Ma (Hauterivian–Barremian boundary): geodynamic consequences. Tectonophysics 306:97–116. doi:10.1016/S0040-1951(99)00047-5

    Article  Google Scholar 

  • Corsini M, Ruffet G, Caby R (2004a) Alpine and late-Hercynian geochronological constraints in the Argentera Massif (Western Alps). Ecol Geol Helv 97:3–15

    Article  Google Scholar 

  • Corsini M, Bosse V, Demoux A, Billo S, Féraud G, Lardeaux JM, Rolland Y, Scharer U (2004b) Late orogenic HT-metamorphism and exhumation during ongoing convergence in the Hercynian Tanneron Massif France. Réunion des Sciences de la Terre, Strasbourg

    Google Scholar 

  • Costa S, Rey P (1995) Lower crustal rejuvenation and growth during post-thickening collapse: insights from a crustal cross section through a Variscan metamorphic core complex. Geology 23:905–908. doi:10.1130/0091-7613(1995)023<0905:LCRAGD>2.3.CO;2

    Article  Google Scholar 

  • Crevola G (1977) Etude pétrographique et structurale de la partie orientale du massif du Tanneron (Provence cristalline). Doctorate thesis, University of Nice, France

  • Crevola G, Pupin J-P (1994) Crystalline provence: structure and variscan evolution. In: Keppie JD (ed) Pre-mesozoic geology in France and related areas. Springer, Berlin, pp 426–441

    Google Scholar 

  • Crevola G, Pupin JP, Toutin-Morin N (1991) La Provence varisque: structure et évolution géologique anté-triasique. Sci Geol Bull 44:287–310

    Google Scholar 

  • Dalrymple GB (1979) Critical tables for conversion of K–Ar ages from old to new constants. Geology 7(11):558–560. doi:10.1130/0091-7613(1979)7<558:CTFCOK>2.0.CO;2

    Article  Google Scholar 

  • Del Moro A, Di Simplicio P, Ghezzo C, Guasparri G, Rita F, Sabatini G (1975) Radiometric data and intrusive sequence in northern Sardinian batholith. Neues Jahrb Miner Abh 126:28–44

    Google Scholar 

  • Demoux A, Scharer U, Corsini M (2008) Variscan evolution of the Tanneron Massif, SE-France, examined through U–Pb monazite ages. J Geol Soc Lond 165:467–478

    Article  Google Scholar 

  • Di Vincenzo G, Carosi R, Palmeri R (2004) The relationship between tectono-metamorphism evolution and argon isotope records in white mica: constraints from in situ 40Ar/39Ar laser analysis of the Variscan basement of Sardinia (Italy). J Petrol 45:1013–1043. doi:10.1093/petrology/egh002

    Article  Google Scholar 

  • Dunlap WJ (1997) Neocrystallization or cooling? 40Ar/39Ar ages of white micas from low-grade mylonites. Chem Geol 143:181–203. doi:10.1016/S0009-2541(97)00113-7

    Article  Google Scholar 

  • Dunlap WJ, Teyssier C, McDougall I, Baldwin S (1991) Ages of deformation from K–Ar and 40Ar/39Ar dating of white micas. Geology 19:1213–1216. doi:10.1130/0091-7613(1991)019<1213:AODFKA>2.3.CO;2

    Article  Google Scholar 

  • Echtler H, Malavielle J (1990) Extensional tectonics, basement uplift and Stephano-Permian collapse basin in a late Variscan metamorphic core complex (Montagne Noire, Southern Massif Central). Tectonophysics 177:125–138. doi:10.1016/0040-1951(90)90277-F

    Article  Google Scholar 

  • Faure JF (1995) Late orogenic Carboniferous extensions in the Variscan French Massif Central. Tectonics 14:132–153. doi:10.1029/94TC02021

    Article  Google Scholar 

  • Faure M, Monié P, Pin C, Maluski H, Leloix C (2002) Late Visean thermal event in the northern part of the French Massif Central: new 40Ar/39Ar and Rb–Sr isotopic constraints on the Hercynian syn-orogenic extension. Int J Earth Sci 91:53–75. doi:10.1007/s005310100202

    Article  Google Scholar 

  • Ferrara G, Ricci CA, Rita F (1978) Isotopic ages and tectonometamorphic history of the metamorphic basement of North-eastern Sardinia. Contrib Miner Petrol 68:99–106. doi:10.1007/BF00375451

    Article  Google Scholar 

  • Gardien V, Lardeaux JM, Ledru P, Allemand P, Guillot S (1997) Metamorphism during the late orogenic extension: insights from the French Variscan belt. Bull Soc Geol Fr 168(3):271–286

    Google Scholar 

  • Harrison TM, Clarke GKC (1979) A model of the thermal effects of igneous intrusion and uplift as supplied to Quottoon pluton, British Columbia. Can J Earth Sci 6:411–420

    Article  Google Scholar 

  • Innocent C, Michard A, Guerrot C, Hamelin B (2003) U–Pb zircon age of 548 Ma for the leptynites (high-grade felsic rocks) of the central part of the Maures Massif. Geodynamic significance of the so-called leptyno-amphibolitic complexes of the Variscan belt of western Europe. Bull Soc Geol Fr 174:585–594. doi:10.2113/174.6.585

    Article  Google Scholar 

  • Jerabek P, Faryadi WS, Schulmann K, Lexa O, Tajcmanova L (2008) Alpine burial and heterogeneous exhumation of Variscan crust in the West Carpathians: insight from thermodynamic and argon diffusion modelling. J Geol Soc Lond 165:479–498

    Article  Google Scholar 

  • Le Marrec A (1976) Reconnaissance pétrographique et structurale des formations cristallophylliennes catazonales du Massif de Sainte-Maxime (quart NE du massif varisque des Maures, Var, France). Thesis, University of Aix-Marseille III

  • Mahéo G, Pêcher A, Guillot S, Rolland Y, Delacourt C (2004) Exhumation of Neogene gneiss domes between oblique crustal boundaries in south Karakorum (northwest Himalaya, Pakistan). Geol Soc Am Special paper 380:141–154

    Google Scholar 

  • Malavieille J (1993) Late orogenic extension in mountain belts: insights from the Basin and Range and the late Paleozoic Variscan belt. Tectonics 12:1115–1130. doi:10.1029/93TC01129

    Article  Google Scholar 

  • Maluski H (1972) Etude 87Rb/87Sr du massif granitique de Plan-de-la-Tour (Maures). C R Acad Sci Paris 274:520–523

    Google Scholar 

  • Maquil R (1976) Contribution à l’étude pétrographique et structurale de la région SE du massif des Maures (Var, France). Ann Soc Geol Belg 99:601–613

    Google Scholar 

  • Matte P (2001) The variscan collage and orogeny (480–290 Ma) and the tectonic definition of the Armorica microplate: a review. Terra Nova 13:117–121. doi:10.1046/j.1365-3121.2001.00327.x

    Article  Google Scholar 

  • McDougall M, Harrison TM (1999) Geochronology and thermochronology by the 40Ar/39Ar method. Oxford University Press, New York

    Google Scholar 

  • Monié P, Maluski H (1983) Données géochronologiques Ar39–Ar40 sur le socle anté-Permien du massif de l’Argentera-Mercantour (Alpes-Maritimes, France). Bull Soc Geol Fr 7:247–257

    Google Scholar 

  • Morillon AC (1997) Etude thermo-chronométrique appliquée aux exhumations et contexte orogénique: le Massif des Maures (France) et Les Cordillères Bétiques (Espagne). Thesis, University of Nice, pp 289

  • Morillon AC, Féraud G, Sosson M, Ruffet G, Crévola G, Lerouge G (2000) Diachronous cooling on both side of a major strike-slip fault in the Variscan Maures Massif (SE France), as deduced from a detailed 40Ar/39Ar study. Tectonophysics 321:103–126. doi:10.1016/S0040-1951(00)00076-7

    Article  Google Scholar 

  • Moussavou M (1998) Contribution à l’histoire thermo-tectonique Varisque du Massif des Maures, par la typologie du zircon et la géochronologie U/Pb sur minéraux accessoires. Thesis, Montpellier, 179

  • Mulch A, Cosca MA, Handy MR (2002) In-situ UV-laser 40Ar/39Ar geochronology of a micaceous mylonite : an example of defect-enhanced argon loss. Contrib Miner Petrol 142:738–752

    Google Scholar 

  • Odin C, Odin GS (1990) Echelle numérique des temps géologiques, Géochronique 35

  • Onezime J, Faure M, Crevola G (1999) Petro-structural analysis of the Rouet–Plan-de-la-Tour granitic complex (Maures and Tanneron Massifs, Var, France). C R Acad Sci 328(11):773–779

    Google Scholar 

  • Paquette JL, Ménot RP, Peucat JJ (1989) REE, Sm–Nd and U–Pb zircon study of eclogites from the Alpine external Massifs (Western Alps): evidence for crustal contamination. Earth Planet Sci Lett 96:181–189. doi:10.1016/0012-821X(89)90131-3

    Article  Google Scholar 

  • Paquette JL, Ménot RP, Pin C, Orsini JB (2003) Episodic and short-lived granitic pulses in a post-collisional setting: evidence from precise U–Pb zircon dating through a crustal cross-section in Corsica. Chem Geol 198:1–20. doi:10.1016/S0009-2541(02)00401-1

    Article  Google Scholar 

  • Roddick JC (1983) High precision intercalibration of 40Ar/39Ar standards. Geochim Cosmochim Acta 47:887–898. doi:10.1016/0016-7037(83)90154-0

    Article  Google Scholar 

  • Roubault MP, Bordet FL, Sonet J, Zimmermann JL (1970) Ages absolus des formations cristallophylliennes des Massifs des Maures et du Tanneron. C R Acad Sci 271:1067–1070

    Google Scholar 

  • Rubatto D, Schaltegger U, Lombardo B, Colombo F, Compagnoni R (2001) Complex Paleozoic magmatic and metamorphic evolution in the Argentera Massif (Western Alps) resolved with U–Pb dating. Schweizerische Minér Petrogr 81:213–228

    Google Scholar 

  • Ruffet G, Féraud G, Amouric M (1991) Comparison of 40Ar/39Ar conventional and laser dating of biotites from the North Tregor Batholith. Geochim Cosmochim Acta 55:1675–1688. doi:10.1016/0016-7037(91)90138-U

    Article  Google Scholar 

  • Seyler M (1975) Pétrologie et lithostratigraphie des formations cristallophylliennes dans la chaîne de la Sauvette (Maures, Var, France). Thesis, Université of Nice

  • Seyler M (1982) Caractères pétrographiques et chimiques des métagabbros de la partie centrale du massif des Maures (Var). Bull Soc Geol Fr 24:717–725

    Google Scholar 

  • Sleep NH (1979) A thermal constraint on the duration of folding with references to Acadian geology, New England (USA). J Geol 87:583–589

    Article  Google Scholar 

  • Soula JC, Debat P, Brusset S, Bessière G, Christophoul F, Déramond J (2001) Thrust-related, diapiric, and extensional doming in a frontal orogenic wedge: example of the Montagne Noire, Southern French Hercynian belt. J Struct Geol 23:1677–1699. doi:10.1016/S0191-8141(01)00021-9

    Article  Google Scholar 

  • Steiger RH, Jäger E (1977) Submission on geochronology: convention in the use of decay constants in geo and cosmochronology. Earth Planet Sci Lett 36:359–362. doi:10.1016/0012-821X(77)90060-7

    Article  Google Scholar 

  • Toutin-Morin N, Crevola G, Giraud JD, Brocard C, Dardeau G, Bulard PF, Dubar M, Meinesz A, Bonijoly D(1994) Carte géologique Fréjus-Cannes à 1/50 000, 2ème édn (1024) carte et notice. BRGM Orléans

  • Turner G, Huneke JC, Podosek FA, Wasserburg GJ (1971) 40Ar/39Ar ages and cosmic ray exposure ages of Apollo 14 samples. Earth Planet Sci Lett 12:19–35. doi:10.1016/0012-821X(71)90051-3

    Article  Google Scholar 

  • Vauchez A, Bufalo M (1985) La limite Maures occidentales-Maures orientales (Var, France): un décrochement majeur entre deux provinces structurales très contrastées. C R Acad Sci Paris 301(14):1059–1062

    Google Scholar 

  • Vauchez A, Bufalo M (1988) Charriage crustal, anatexie, et décrochements ductiles dans les Maures orientales (Var, France) au cours de l’orogenèse varisque. Geol Rundsch 77:45–62. doi:10.1007/BF01848675

    Article  Google Scholar 

  • Villa IM (1998) Isotopic closure. Terra Nova 10:42–47. doi:10.1046/j.1365-3121.1998.00156.x

    Article  Google Scholar 

  • Whitney DL, Teyssier C, Heizler MT (2007) Gneiss domes, metamorphic core complexes, and wrench zones: thermal and structural evolution of the Nigde Massif, central Anatolia. Tectonics 26:1–23. doi:10.1029/2006TC002040

    Article  Google Scholar 

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  1. Géosciences Azur (UMR-CNRS 6526), Nice-Sophia Antipolis University, Campus Valrose, 06 108, Nice Cedex, France

    Michel Corsini & G. Féraud

  2. Laboratoire Magmas Volcans (UMR-CNRS 6524), Blaise Pascal University, Clermont-Ferrand, France

    V. Bosse

  3. Institut für Geowissenschaften, Mainz University, Mainz, Germany

    A. Demoux

  4. Institut EGID, Bordeaux III University, Pessac, France

    G. Crevola

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  1. Michel Corsini
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Correspondence to Michel Corsini.

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Corsini, M., Bosse, V., Féraud, G. et al. Exhumation processes during post-collisional stage in the Variscan belt revealed by detailed 40Ar/39Ar study (Tanneron Massif, SE France). Int J Earth Sci (Geol Rundsch) 99, 327–341 (2010). https://doi.org/10.1007/s00531-008-0397-x

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