Advertisement

International Journal of Earth Sciences

, Volume 106, Issue 2, pp 501–515 | Cite as

Ordovician magmatism in the Lévézou massif (French Massif Central): tectonic and geodynamic implications

  • Caroline Lotout
  • Pavel Pitra
  • Marc Poujol
  • Jean Van Den Driessche
Original Paper

Abstract

New U–Pb dating on zircon yielded ca. 470 Ma ages for the granitoids from the Lévézou massif in the southern French Massif Central. These new ages do not support the previous interpretation of these granitoids as syn-tectonic intrusions emplaced during the Late Devonian-Early Carboniferous thrusting. The geochemical and isotopic nature of this magmatism is linked to a major magmatic Ordovician event recorded throughout the European Variscan belt and related to extreme thinning of continental margins during a rifting event or a back-arc extension. The comparable isotopic signatures of these granitoids on each side of the eclogite-bearing leptyno-amphibolitic complex in the Lévézou massif, together with the fact that they were emplaced at the same time, strongly suggest that these granitoids were originally part of a single unit, tectonically duplicated by either isoclinal folding or thrusting during the Variscan tectonics.

Keywords

Variscan Orthogneiss Geochronology U/Pb Ordovician Geochemistry 

Notes

Acknowledgments

We sincerely thank X. Le Coz and Y. Lepagnot for the sample preparation, J. Langlade for the assistance with microprobe analysis, and D. Vilbert for the Sm/Nd and Sr isotopic analysis. V. Janoušek and P. Boulvais are thanked for helpful discussions about the whole-rock and isotopic geochemistry. Constructive reviews of P. Jeřábek and J.M. Lardeaux helped to improve the manuscript.

Supplementary material

531_2016_1387_MOESM1_ESM.docx (16 kb)
Supplementary material 1 (DOCX 15 kb)
531_2016_1387_MOESM2_ESM.xlsx (114 kb)
Supplementary material 2 (XLSX 113 kb)

References

  1. Abati J, Dunning GR, Arenas R, García FD, Cuadra PG, Catalán JM, Andonaegui P (1999) Early Ordovician orogenic event in Galicia (NW Spain): evidence from U–Pb ages in the uppermost unit of the Ordenes Complex. Earth and Planetary Science Letters 165:213–228CrossRefGoogle Scholar
  2. Ballèvre M, Bosse V, Ducassou C, Pitra P (2009) Palaeozoic history of the Armorican Massif: models for the tectonic evolution of the suture zones. C R Geosci 341:174–201CrossRefGoogle Scholar
  3. Ballèvre M, Fourcade S, Capdevila R, Peucat JJ, Cocherie A, Fanning CM (2012) Geochronology and geochemistry of Ordovician felsic volcanism in the Southern Armorican Massif (Variscan belt, France): implications for the breakup of Gondwana. Gondwana Res 21:1019–1036CrossRefGoogle Scholar
  4. Ballèvre M, Martínez Catalán JR, López-Carmona A, Pitra P, Abati J, Díez Fernández R, Ducassou C, Arenas R, Bosse V, Castiñeiras P, Fernández-Suárez J, Gómez Barreiro J, Paquette J-L, Peucat J-J, Poujol M, Ruffet G, Sánchez Martínez S (2014) Correlation of the nappe stack in the Ibero-Armorican arc across the Bay of Biscay: a joint French-Spanish project. In: Schulmann K, Martínez Catalán JR, Lardeaux J-M, Janoušek V, Oggiano G (eds) The Variscan orogeny: extent, timescale and the formation of the European Crust. Geol Soc Lond 405:77–113Google Scholar
  5. Ballouard C, Boulvais P, Poujol M, Gapais D, Yamato P, Tartèse R, Cuney M (2015) Tectonic record, magmatic history and hydrothermal alteration in the Hercynian Guérande leucogranite, Armorican Massif, France. Lithos 220–223:1–22CrossRefGoogle Scholar
  6. Bard JP, Burg JP, Matte P, Ribeiro A (1980) La Chaîne Hercynienne d’Europe Occidentale en termes de tectonique des plaques. In: International geological congress, 26th mémber BRGM, Paris, vol 108, pp 233–246Google Scholar
  7. Barrat JA, Zanda B, Moynier F, Bollinger C, Liorzou C, Bayon G (2012) Geochemistry of CI chondrites: major and trace elements, and Cu and Zn Isotopes. Geochim Cosmochim Acta 83:79–92CrossRefGoogle Scholar
  8. Berger J, Féménias O, Ohnenstetter D, Bruguier O, Plissart G, Mercier JC, Demaiffe D (2010) New occurrence of UHP eclogites in Limousin (French Massif Central): age, tectonic setting and fluid–rock interactions. Lithos 118:365–382CrossRefGoogle Scholar
  9. Briand B, Piboule M, Bouchardon JL (1988) Diversité géochimique des métabasites des groupes leptyno-amphiboliques du Rouergue et de Marvejols (Massif central). Origine et implications. Bull Soc Géol France 8:489–498Google Scholar
  10. Burg JP (1987) Regional shear variation in relation to diapirism and folding. J Struct Geol 9:925–934CrossRefGoogle Scholar
  11. Burg JP, Matte P (1978) A cross section through the French Massif Central and the scope of its Variscan evolution. Z Dtsch Geol Ges 129:429–440Google Scholar
  12. Burg JP, Teyssier C (1983) Contribution à l’étude tectonique et microtectonique des séries cristallophyliennes du Rouergue oriental: la déformation des laccolites syntectoniques, type Pinet. Géol France 1:3–30Google Scholar
  13. Burg JP, Delor C, Leyreloup A (1986) Le massif du Lévezou et les séries adjacentes du Rouergue oriental. Nouvelles données pétrographiques et structurales. Géol France 3:229–272Google Scholar
  14. Burg JP, Van Den Driessche J, Brun JP (1994) Syn-to post-thickening extension in the Variscan Belt of Western Europe: modes and structural consequences. Géol France 3:33–51Google Scholar
  15. Carignan J, Hild P, Mevelle G, Morel J, Yeghicheyan D (2001) Routine analyses of trace elements in geological samples using flow injection and low pressure on-line liquid chromatography coupled to ICP-MS: a study of geochemical reference materials BR, DR-N, UB-N, AN-G and GH. Geostandards Newslett 25:187–198CrossRefGoogle Scholar
  16. Collomb P (1970) Etude géologique du Rouergue cristallin. Mém. Expl. Serv. Carte Géological, ParisGoogle Scholar
  17. Crowley QG, Floyd PA, Winchester JA, Franke W, Holland JG (2000) Early Palaeozoic rift-related magmatism in Variscan Europe: fragmentation of the Armorican Terrane Assemblage. Terra Nova 12(4):171–180CrossRefGoogle Scholar
  18. Debon F, LeFort P (1983) A chemical–mineralogical classification of common plutonic rocks and associations. Trans R Soc Edinburgh: Earth Sci 73:135–149CrossRefGoogle Scholar
  19. Del Greco K, Johnston ST, Shaw J (2016) Tectonic setting of the North Gondwana margin during the Early Ordovician: a comparison of the Ollo de Sapo and Famatina magmatic events. Tectonophysics 681:73–84CrossRefGoogle Scholar
  20. Delbos L, Lasserre M, Roques M (1964) Géochronologie et rétromorphose dans la série cristallophyllienne du Rouergue (Massif central français). Sci Terre 10:329–342Google Scholar
  21. Delor C, Leyreloup A, Burg JP (1985) Nouveaux arguments pétrologiques enfaveur de l’allochtonie du Lévézou (Massif Central français): les enclaves basiques des granites calco-alcalins et les métacornéennes associées. C R Acad Sci Paris 301:1037–1042Google Scholar
  22. Delor C, Burg JP, Leyreloup A, Teyssier C (1989) Carte géol France (1/50000), feuille Salles Curan(908). BRGM, OrléansGoogle Scholar
  23. Dewey JF, Burke KCA (1973) Tibetan, Variscan, and precambrian basement reactivation: products of continental collision. J Geol 81:683–692CrossRefGoogle Scholar
  24. Ducrot J, Lancelot JR, Marchand J (1983) Datation U–Pb sur zircons de l’éclogite de la Borie (Haut-Allier, France) et conséquences sur l’évolution anté-hercynienne de l’Europe occidentale. Earth Planet Sci Lett 18:97–113Google Scholar
  25. Duguet M, Faure M (2004) Successive shearing tectonics during the hercynian collisional evolution of the southwestern French Massif Central. Bull Soc Geol France 175:49–59CrossRefGoogle Scholar
  26. Dutruge G, Burg JP (1997) Strain localisation in an orthogneiss laccolith (the Pinet massif, Aveyron, southern France). Tectonophysics 280:47–60CrossRefGoogle Scholar
  27. Forestier FH (1961) Métamorphisme hercynien et antéhercynien dans le bassin du haut-Allier (Massif Central français), PhD Thesis, Clermont-Ferrand UniversityGoogle Scholar
  28. Forestier FH, Lasnier B, Leyreloup A, Marchand J (1973) Vues nouvelles sur la catazone dans le Massif Central français et le Massif Armoricain de l’affleurement au Moho. Bull Soc Géol France 15:562–578CrossRefGoogle Scholar
  29. Franke W (2006) The Variscan orogen in Central Europe: construction and collapse. Memoirs Geol Soc London 32:333–343CrossRefGoogle Scholar
  30. Guérangé-Lozes J, Burg JP, Vinchon C, Alabouvette B, Defaut B, Astruc JG, Galharague J, Leyreloup A, Michard AG, Perrin C, Servelle S (1995) Carte géol France (1/50000), feuille Requista(934). BRGM, OrléansGoogle Scholar
  31. Harris NB, Pearce JA, Tindle AG (1986) Geochemical characteristics of collision-zone magmatism. Geol Soc Lond Spec Publ 19:67–81CrossRefGoogle Scholar
  32. Helbing H, Tiepolo M (2005) Age determination of Ordovician magmatism in NE Sardinia and its bearing on Variscan basement evolution. J Geol Soc 162:689–700CrossRefGoogle Scholar
  33. Jackson SE, Pearson NJ, Griffin WL, Belousova EA (2004) The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U–Pb zircon geochronology. Chem Geol 211:47–69CrossRefGoogle Scholar
  34. Janousek V, Moyen JF, Martin H, Erban V, Farrow C (2015) Geochemical modelling of igneous processes–principles and recipes in R Language: bringing the Power of R to a Geochemical Community. Springer, Berlin, 347 pGoogle Scholar
  35. Janoušek V, Farrow CM, Erban V (2006) Interpretation of whole-rock geochemical data in igneous geochemistry: introducing Geochemical Data Toolkit (GCDkit). J Petrol 47:1255–1259CrossRefGoogle Scholar
  36. Lafon JM (1984) La granodiorite de Caplongue, nouveau témoin d'un magmatisme cambrien dans le Rouergue oriental. C R Acad Sci Paris 298:595–600Google Scholar
  37. Lardeaux JM (2014) Deciphering orogeny: a metamorphic perspective Examples from European Alpine and Variscan belts Part II: Variscan metamorphism in the French Massif Central—a review. Bull Soc Géol France 185:281–310CrossRefGoogle Scholar
  38. Lasnier B (1968) Découverte de roches éclogitiques dans le groupe leptyno-amphibolique des monts du Lyonnais (Massif central français). Bull Soc Géol France 7:179–185Google Scholar
  39. Ledru P, Lardeaux JM, Santallier D, Autran A, Quenardel JM, Floc’h JP, Lerouge G, Maillet N, Marchand J, Ploquin A (1989) Où sont les nappes dans le Massif central français? Bull Soc Géol Fr 3:605–618Google Scholar
  40. Liew TC, Hofmann AW (1988) Precambrian crustal components, plutonic associations, plate environment of the Hercynian Fold Belt of central Europe: indications from a Nd and Sr isotopic study. Contrib Miner Petrol 98:129–138CrossRefGoogle Scholar
  41. Linnemann U, McNaughton NJ, Romer RL, Gehmlich M, Drost K, Tonk C (2004) West African provenance for Saxo-Thuringia (Bohemian Massif): Did Armorica ever leave pre-Pangean Gondwana?—U/Pb-SHRIMP zircon evidence and the Nd-isotopic record. Int J Earth Sci 93(5):683–705CrossRefGoogle Scholar
  42. Ludwig KR (2012) User’s manual for a geochronological toolkit for Microsoft Excel. Berkeley Geochronological Cent, 75Google Scholar
  43. Martínez Catalán JR, Arenas R, Abati J, Sánchez Martínez S, Díaz García F, Fernández-Suárez J, González Cuadra P, Castiñeiras P, Gómez Barreiro J, Díez Montes A, Gónzalez Clavijo E, Pascual FJR, Andonaegui P, Jeffries TE, Alcock JE, Díez Fernández R, López Carmona A (2009) A rootless suture and the loss of the roots of a mountain chain: the Variscan belt of NW Iberia. CR Geosci 341:114–126CrossRefGoogle Scholar
  44. Matte P (1986) Tectonics and plate tectonics model for the Variscan belt of Europe. Tectonophysics 126:329–374CrossRefGoogle Scholar
  45. Matte P (1991) Accretionary history of the Variscan belt in western Europe. Tectonophysics 196:309–337CrossRefGoogle Scholar
  46. Matte P (2001) The Variscan collage and orogeny (480–290 Ma) and the tectonic definition of the Armorica microplate: a review. Terra Nova 13(2):122–128CrossRefGoogle Scholar
  47. Matte P, Burg JP (1981) Sutures, thrusts and nappes in the Variscan arc of Western Europe: plate tectonic implication. In: McClay K, Price NJ (eds) Thrust and Nappe Tectonics. Geol Soc Lond Spec Publ 8:353–357Google Scholar
  48. Montero P, Talavera C, Bea F, Lodeiro FG, Whitehouse MJ (2009) Zircon Geochronology of the Ollo de Sapo formation and the age of the Cambro-Ordovician Rifting in Iberia. J Geol 117(2):174–191CrossRefGoogle Scholar
  49. Nicollet C (1978) Pétrologie et tectonique des terrains cristallins anté-permiens du versant sud du dôme du Lévezou (Rouergue, Massif central). Bull BRGM 3:225–263Google Scholar
  50. Paquette JL, Monchoux P, Couturier M (1995) Geochemical and isotopic study of a norite-eclogite transition in the European Variscan Belt: implications for U–Pb zircon systematics in metabasic rocks. Geochim Cosmochim Acta 59:1611–1622CrossRefGoogle Scholar
  51. Paquette JL, Piro JL, Devidal JL, Bosse V, Didier A, Sanac S, Abdelnour Y (2014) Sensitivity enhancement in LA-ICP-MS by N2 addition to carrier gas: application to radiometric dating of U–Th-bearing minerals. Agilent ICP-MS J 58:1–5Google Scholar
  52. Piboule M (1979) L’origine des amphibolites: approche géochimique et mathématique. Application aux amphibolites du Massif central français. Thèse d’Etat, Lyon I UniversityGoogle Scholar
  53. Pin C (1979) Géochronologie U–Pb et microtectonique des séries métamorphiques anté-stéphaniennes de l’Aubrac et de la région de Marvejols (Massif central). PhD Thesis, Montpellier UniversityGoogle Scholar
  54. Pin C (1981) Old inherited zircons in two synkinematic variscan granitoids: the «granite du Pinet» and the «orthogneiss de Marvejols» (southern French Massif central). N J Miner Abh 142:27–48Google Scholar
  55. Pin C (1990) Variscan oceans: ages, origins and geodynamic implications inferred from geochemical and radiometric data. Tectonophysics 177:215–227CrossRefGoogle Scholar
  56. Pin C, Lancelot J (1982) U–Pb dating of an early Paleozoïc bimodal magmatism in the French Massif central and its further metamorphic evolution. Contrib Mineral Petrol 79:1–12CrossRefGoogle Scholar
  57. Pin C, Marini F (1993) Early Ordovician continental break-up in Variscan Europe: Nd–Sr isotope and trace element evidence from bimodal igneous associations of the Southern Massif Central, France. Lithos 29(3):177–196CrossRefGoogle Scholar
  58. Pin C, Piboule M (1988) Upper Devonian U–Pb zircon age of the calc-alkaline series in the Levezou mafic belt, Rouergue (Massif Central, France). A composite leptyno-amphibolitic association. Bull Soc Géol Fr 4:261–265Google Scholar
  59. Pin C, Vielzeuf D (1983) Granulites and related rocks in Variscan median Europe: a dualistic interpretation. Tectonophysics 93:47–74CrossRefGoogle Scholar
  60. Pitra P, Poujol M, Van Den Driessche J, Poilvet JC, Paquette JL (2012) Early Permian extensional shearing of an Ordovician granite: the Saint-Eutrope “C/S-like” orthogneiss (Montagne Noire, French Massif Central). Comptes Rendus Géoscience 344:377–384CrossRefGoogle Scholar
  61. Ribeiro A, Munhá J, Dias R, Mateus A, Pereira E, Ribeiro L, Fonseca P, Araújo A, Oliveira T, Romão J, Chaminé H, Coke C, Pedro J (2007) Geodynamic evolution of the SW Europe Variscides. Tectonics 26:1–24 TC6009Google Scholar
  62. Roger F, Respaut JP, Brunel M, Matte P, Paquette JL (2004) U–Pb dating of Augen orthogneisses from the axial zone of the Montague Noire (Southern of Massif Central): new witness of Ordovician magmatism into the Variscan Belt. Comptes Rendus Géoscience 336:19–28CrossRefGoogle Scholar
  63. Sánchez-García T, Bellido F, Quesada C (2003) Geodynamic setting and geochemical signatures of Cambrian-Ordovician rift-related igneous rocks (Ossa-Morena Zone, SW Iberia). Tectonophysics 365(1–4):233–255CrossRefGoogle Scholar
  64. Sánchez-García T, Quesada C, Bellido F, Dunning GR, González del Tánago J (2008) Two-step magma flooding of the upper crust during rifting: the Early Paleozoic of the Ossa Morena Zone (SW Iberia). Tectonophysics 461(1–4):72–90CrossRefGoogle Scholar
  65. Santallier D, Briand B, Menot RP, Piboule M (1988) Les complexes leptyno-amphiboliques (C.L.A.); revue critique et suggestions pour un meilleur emploi de ce terme. Bull Soc Géol Fr 4:3–12Google Scholar
  66. Schulmann K, Catalán JR, Lardeaux JM, Janoušek V, Oggiano G (2014) The Variscan orogeny: extent, timescale and the formation of the European crust. Geol Soc Lond Spec Publ 405:1–6CrossRefGoogle Scholar
  67. Shand SJ (1943) Eruptive rocks. Their genesis, composition, classification, and their relation to ore-deposits with a chapter on meteorite. Wiley, New YorkGoogle Scholar
  68. Solá AR, Pereira MF, Williams IS, Ribeiro ML, Neiva AM, Montero P, Bea F, Zinger T (2008) New insights from U–Pb zircon dating of Early Ordovician magmatism on the northern Gondwana margin: the Urra Formation (SW Iberian Massif, Portugal). Tectonophysics 461:114–129CrossRefGoogle Scholar
  69. Sun SS, McDonough WF (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Geol Soc Lond Spec Publ 42:313–345CrossRefGoogle Scholar
  70. Talavera C, Montero P, Bea F, González Lodeiro F, Whitehouse M (2013) U–Pb Zircon geochronology of the Cambro-Ordovician metagranites and metavolcanic rocks of central and NW Iberia. Int J Earth Sci 102:1–23CrossRefGoogle Scholar
  71. Van Achterbergh E, Ryan CG, Jackson SE, Griffin WL (2001) Data reduction software for LA-ICP-MS: appendix. In: Sylvester PJ (ed) Laser Ablation-ICP-mass spectrometry in the earth sciences: principles and applications. In Mineralog Assoc Canada (MAC) Short Courses Series, Ottawa, vol 29, pp 239–243Google Scholar
  72. Vermeesch P (2012) On the visualisation of detrital age distributions. Chem Geol 312–313:190–194CrossRefGoogle Scholar
  73. Wiedenbeck M, Allé P, Corfu F, Griffin WL, Meier M, Oberli F, von Quadt A, Roddick JC, Spiegel W (1995) Three natural zircon standards for U–Th–Pb, Lu–Hf, trace element and REE analyses. Geostand Newsl 19:1–23CrossRefGoogle Scholar
  74. Young TP (1990) Ordovician sedimentary facies and faunas of southwest Europe: palaeogeographic and tectonic implications. Geol Soc Lond Memoirs 12(1):421–430CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Caroline Lotout
    • 1
  • Pavel Pitra
    • 1
    • 2
  • Marc Poujol
    • 1
  • Jean Van Den Driessche
    • 1
  1. 1.UMR CNRS 6118, Géosciences RennesOSURRennes CedexFrance
  2. 2.Česká Geologická SlužbaPrague 1Czech Republic

Personalised recommendations