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Discovery of an albite gneiss from the Ile de Groix (Armorican Massif, France): geochemistry and LA-ICP-MS U–Pb geochronology of its Ordovician protolith

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Abstract

For the first time, an albite orthogneiss has been recognised and dated within the HP–LT blueschist facies metabasites and metapelites of the Ile de Groix. It is characterised by a peraluminous composition, high LILE, Th and U contents, MORB-like HREE abundances and moderate Nb and Y values. A U–Pb age of 480.8 ± 4.8 Ma was obtained by LA-ICP-MS dating of zircon and titanite. It is interpreted as the age of the magmatic emplacement during the Early Ordovician. Morphologically different zircon grains yield late Neoproterozoic ages of 546.6–647.4 Ma. Zircon and titanite U–Pb ages indicate that the felsic magmatism from the Ile de Groix is contemporaneous with the acid, pre-orogenic magmatism widely recognised in the internal zones of the Variscan belt, related to the Cambro-Ordovician continental rifting. The magmatic protolith probably inherited a specific chemical composition from a combination of orogenic, back-arc and anorogenic signatures because of partial melting of the Cadomian basement during magma emplacement. Besides, the late Devonian U–Pb age of 366 ± 33 Ma obtained for titanite from a blueschist facies metapelite corresponds to the age of the HP–LT peak metamorphism.

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References

  • Altherr R, Siebel W (2002) I-type plutonism in a continental back-arc setting: Miocene granitoids and monzonites from the central Aegean Sea, Greece. Contrib Mineral Petrol 143:397–415

    Article  Google Scholar 

  • Arenas R, Martínez Catalán JR, Sánchez Martínez S, Fernández-Suárez J, Andonaegui P, Pearce JA, Corfu F (2007) The vila de Cruces Ophiolite: a remnant of the early Rheic Ocean in the Variscan suture of Galicia (Northwest Iberian Massif). J Geol 115:129–148

    Article  Google Scholar 

  • Audren C, Lefort JP (1977) Géologie du plateau continental sud armoricain entre les îles de Glénan et de Noirmoutier. Implications geodynamiques. Bull Soc Géol France 7(XIX):395–404

    Google Scholar 

  • Audren C, Triboulet C, Chauris L, Lefort JP, Vigneresse JL, Audrain J, Thiéblemont D, Goyallon J, Jégouzo P, Guennoc P, Augris C, Carn A (1993) Notice explicative de la feuille Ile de Groix à 1/25000 (carte géologique). BRGM, Orléans

    Google Scholar 

  • Azor A, Rubatto D, Simancas JF, Lodeiro FG, Martínez Poyatos D, Martín Parra LM, Matas J (2008) Rheic Ocean ophiolitic remnants in southern Iberia questioned by SHRIMP U–Pb zircon ages on the Beja-Acebuches amphibolites. Tectonics 27 TC5006 doi:10.1029/2008TC002306

  • Ballèvre M, Paris F, et Robardet M (1992) Corrélations ibéro-armoricaines au Paléozoïque : confrontation des données paléobiogéographiques et tectonométa-morphiques. CR Acad Sci Paris (II) 315:1783–1789

    Google Scholar 

  • Ballèvre M, Bosse V, Gapais D (1998) Les schistes bleus de l’île de Groix (Massif armoricain): un paléoprisme d’accrétion. Réunion des Sciences de la Terre XVII, Brest, Soc Géol France ed., Paris, pp 66–67

  • Ballèvre M, Le Goff E, Hébert R (2001) The tectonothermal evolution of the Cadomian belt of northern Brittany, France: a Neoproterozoic arc. Tectonophysics 331:19–43

    Article  Google Scholar 

  • Ballèvre M, Capdevila R, Guerrot C, Peucat JJ (2002) Discovery of an alkaline orthogneiss in the eclogite-bearing cellier unit (Champtoceaux Complex, Armorican Massif): a new witness of the Ordovician rifting. CR Geosci 334:303–311

    Article  Google Scholar 

  • Ballèvre M, Pitra P, Bohn M (2003) Lawsonite growth in the epidote blueschists from the Ile de Groix (Armorican massif, France): a potential geobarometer. J Metam Geol 21:723–735

    Article  Google Scholar 

  • Ballèvre M, Bosse V, Ducassou C, Pitra P (2009) Palaeozoic history of the Armorican Massif: models for the tectonic evolution of the suture zones. CR Geosci 341:174–201

    Article  Google Scholar 

  • Ballèvre M, Fourcade S, Capdevila R, Peucat JJ, Cocherie A, Fanning CM (2011) Geochronology and geochemistry of the Ordovician felsic volcanism in the Southern Armorican Massif (Variscan belt, France). Implications for the breakup of Gondwana. Gondwana Res. doi:10.1016/j.gr.2011.07.030

  • Bard JP (1971) Sur l’alternance des zones métamorphiques et granitiques dans le segment hercynien sud-ibérique; comparaison de la variabilité des caractères géotectoniques de ces zones avec les orogènes “orthotectoniques”. Bol Geol Minero 82:321–345

    Google Scholar 

  • Bea F, Montero P, González-Lodeiro F, Talavera C (2007) Zircon inheritance reveals exceptionally fast crustal magma generation processes in Central Iberia during the Cambro-Ordovician. J Petrol 48:2327–2339

    Article  Google Scholar 

  • Béchennec F, Guennoc P, Guerrot C, Lebret P, Thieblemont D (1997) Notice explicative de la feuille Concarneau à 1/50000 (carte géologique). BRGM, Orléans

    Google Scholar 

  • Bernard-Griffiths J, Carpenter MSN, Peucat JJ, Jahn BM (1986) Geochemical and isotopic characteristics of blueschist facies rocks from the Ile de Groix, Armorican Massif (northwest France). Lithos 19:235–253

    Article  Google Scholar 

  • Bosse V, Ballèvre M, Vidal O (2002) Ductile thrusting recorded by the garnet isograd from blueschist-facies metapelites of the Ile de Groix, Armorican Massif, France. J Petrol 43:485–510

    Article  Google Scholar 

  • Bosse V, Féraud G, Ballèvre M, Peucat JJ, Corsini M (2005) Rb–Sr and 40Ar/39Ar ages in blueschists from the Ile de Groix (Armorican Massif, France): Implications for closure mechanisms in isotopic systems. Chem Geol 220:21–45

    Article  Google Scholar 

  • Boudier F, Nicolas A (1976) Interprétation nouvelle des relations entre tectonique et métamorphisme dans l’|le de Groix (Bretagne). Bull Soc Geol France XVIII:135–144

    Google Scholar 

  • Boyer C (1974) Volcanismes acides paléozoïques dans le Massif armoricain, thèse, université Paris-Sud, Orsay, 384 p

  • Brun JP, Guennoc P, Truffert C, Vairon J (2001) Cadomian tectonics in northern Brittany: a contribution of 3-D crustal-scale modelling. Tectonophysics 331:229–246

    Article  Google Scholar 

  • Bucher K, Frost BR (2006) Fluid transfer in high-grade metamorphic terrains intruded by anorogenic granites: the Thor range, Antartica. J Petrol 47:567–593

    Article  Google Scholar 

  • Bussy F, Péronnet V, Ulianov A, Epard JL, von Raumer J (2011) Ordovician magmatism in the external French Alps: witness of a peri-gondwanan active continental margin. In: Gutiérrez-Marco JC, Rábano I, García-Bellido D (eds) Ordovician of the World. Cuadernos del Museo Geominero 14. Instituto Geológico y Minero de España, Madrid, pp 567–574

    Google Scholar 

  • Carpenter MSN (1976) Petrogenetic study of the glaucophane schists and associated rocks from the Ile de Groix, Brittany, France. Unpublished PhD Thesis, Oxford University, 271 pp

  • Carpenter MSN, Civetta L (1976) Hercynian high pressure/low temperature metamorphism in the Ile de Groix blueschists. Nature 262:276–277

    Article  Google Scholar 

  • Chantraine J, Egal E, Thiéblemont D, Le Goff E, Guerrot C, Ballèvre M, Guennoc P (2001) The Cadomian active margin (North Armorican Massif, France): a segment of the North Atlantic Panafrican belt. Tectonophysics 331:1–18

    Article  Google Scholar 

  • Chappell BW, White AJR (1974) Two contrasting granite types. Pac Geol 8:173–174

    Google Scholar 

  • Clark AH, Scott DJ, Sandeman HA, Bromley AV, Farrar E (1998) Siegenian generation of the Lizard ophiolite: U–Pb zircon age for plagiogranite, Porthkerris, Cornwall. J Geol Soc Lond 155:595–598

    Article  Google Scholar 

  • Cogné J (1971) Le Massif armoricain et sa place dans la structure des socles ouest-européens; 1′arc hercynien ibéro-armoricain. In: Debysser J, Le Pichon X, Montadert L (Eds.), Histoire Structurale du Golfe de Gascogne vol 1, Paris, Technip, pp 1–23

  • Cogné J, Jeannette D, Ruhland M (1966) L’Ile de Groix: étude structurale d’une série métamorphique à glaucophane en Bretagne méridionale. Bulletin du Service de la Carte Géologique d’Alsace-Lorraine 19:41–95

    Google Scholar 

  • Crowley QG, Floyd PA, Winchester JA, Franke W, Holland JG (2000) Early Paleozoic rift-related magmatism in Variscan Europe: fragmentation of the Armorican Terrane Assemblage. Terra Nova 12:171–180

    Article  Google Scholar 

  • Díaz Garcia F, Arenas R, Martínez Catalán JR, González del Tánago J, Dunning GR (1999) Tectonic evolution of the Careón Ophiolite (Northwest Spain): a remnant of oceanic lithosphere in the Variscan belt. J Geol 107:587–605

    Article  Google Scholar 

  • Djro SC, Triboulet C, Audren C (1989) Les chemins pression-température-temps-déformation-espace (P–T–t–d–e) dans les micaschistes associés aux schistes bleus de l’île de Groix, Bretagne Méridionale, France. Schweiz Mineral Petrogr Mitt 69:73–90

    Google Scholar 

  • El Korh A (2006) Métamorphisme HP-BT dans les métabasites de l’Ile de Groix, France: étude pétrologique et géochimique. Unpublished Master Thesis, University of Geneva, 334 pp

  • El Korh A (2010) Geochemical fingerprints of devolatilisation reactions in the high-pressure rocks of Ile de Groix, France. PhD Thesis, University of Geneva, Terre et Environnement 99, 361 pp

  • El Korh A, Schmidt STh, Ulianov A, Potel S (2009) Trace element partitioning in HP–LT metamorphic assemblages during subduction-related metamorphism, Ile de Groix, France: a detailed LA-ICP-MS study. J Petrol 50:1107–1148

    Article  Google Scholar 

  • El Korh A, Schmidt STh, Vennemann T, Ulianov A (2011) Trace element and O-isotope composition of polyphase metamorphic veins of the Ile de Groix (Armorican Massif, France): implication for fluid flow during HP subduction and exhumation processes. In: Dobrzhinetskaya L, Faryad W, Wallis S, Cuthbert S (eds) Ultrahigh pressure metamorphism: 25 years after discovery of coesite and diamond. Elsevier, Amsterdam, pp 243–291

    Chapter  Google Scholar 

  • England PC, Thompson AB (1984) Pressure–temperature–time paths of regional metamorphism; I. Heat transfer during the evolution of regions of thickened continental crust. J Petrol 25:894–928

    Google Scholar 

  • Floyd PA, Winchester JA, Seston R, Kryza R, Crowley QG (2000) Review of geochemical variation in Lower Palaeozoic metabasites from the NE Bohemian Massif: intracratonic rifting and plume–ridge interaction. In: Franke W, Haak V, Oncken O, Tanner D (eds.) Orogenic processes: quantification and modelling in the Variscan Belt. Geol Soc Lond Spec Pub 179:155–174

  • Frost BR, Chamberlain KR, Schumacher JC, Scott DJ, Moser DE (2000) Sphene (titanite); phase relations and role as a geochronometer. Chem Geol 172:131–148

    Article  Google Scholar 

  • Frost BR, Barnes CG, Collins WJ, Arculus RJ, Ellis DJ, Frost CD (2001) A geochemical classification of granitic rocks. J Petrol 42:2033–2048

    Article  Google Scholar 

  • Gapais D, Lagarde JL, Le Corre C, Audren C, Jégouzo P, Casas Sainz A, Van Den Driessche J (1993) La zone de cisaillement de Quiberon: témoin d’extension de la chaîne varisque en Bretagne méridionale au Carbonifère. Comptes Rendus de l’Académie des Sciences de Paris II 316:1123–1129

    Google Scholar 

  • Guerrot C, Béchennec F, Thiéblemont D (1997) Le magmatisme paléozoïque de la partie nord-ouest du domaine nord-armoricain: données géochronologiques nouvelles. Comptes-Rendus de l’Académie des Sciences de Paris (IIa) 324:977–984

    Google Scholar 

  • Guillocheau F, Rolet J (1982) La sédimentation paléozoïque ouest-armoricaine. Histoire sédimentaire; relations tectonique–sédimentation. Bulletin de la Société Géologique et Minéralogique de Bretagne (C) 14:45–62

    Google Scholar 

  • Haapala I, Rämö OT, Frindt S (2005) Comparison of Proterozoic and Phanerozoic rift related basaltic-granitic magmatism. Lithos 80:1–32

    Article  Google Scholar 

  • Harris NBW, Pearce JA, Tindle AG (1986) Geochemical characteristics of collision-zone magmatism. In: Coward MP, Ries AC (eds), Collision Tectonics 19, Geol Soc Lond Spec Pub, pp 67–81

  • Heaman L (2009) The application of U–Pb geochronology to mafic, ultramafic and alkaline rocks: an evaluation of three mineral standards. Chem Geol 261:43–52

    Article  Google Scholar 

  • 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 211:47–69

    Article  Google Scholar 

  • Jégouzo P, Peucat JJ, Audren C (1986) Caractérisation et signification géodynamique des orthogneiss calcoalcalins d’âge ordovicien de Bretagne méridionale. Bull Soc Géol France (8) II, pp 839–848

  • Klimas-August K (1990) Genesis of gneisses and granites from the eastern part of the Izera metamorphic complex in the light of studies on zircons from selected geological profiles. Geol Sudetica 24:1–71

    Google Scholar 

  • Kretz R (1983) Symbols for rock-forming minerals. Am Mineral 68:277–279

    Google Scholar 

  • Kryza R, Pin C (2010) The central-sudetic ophiolites (SW Poland): petrogenetic issues, geochronology and palaeotectonic implications. Gondwana Res 17:292–305

    Article  Google Scholar 

  • Le Corre C (1977) Le Briovérien de Bretagne centrale: essai de synthèse lithologique et structurale. Bull Bur Rech Géol Min I (3), pp 219–254

  • Le Hébel F, Vidal O, Kiénast JR, Gapais D (2002a) Les « Porphyroïdes » de Bretagne méridionale: une unité de HP-BT dans la chaîne Hercynienne. CR Geosci 334:205–211

    Article  Google Scholar 

  • Le Hébel F, Gapais D, Fourcade S, Capdevila R (2002b) Fluid-assisted large strains in a crustal-scale décollement (Hercynian belt of South Brittany, France). In: De Meer S, Drury MS, De Bresser JHP, Pennock GM (Eds.), Deformation mechanisms, rheology and tectonics: current status and future perspectives. Geol Soc Lond Spec Pub 200:85–101

  • López-Carmona A, Abati J, Reche J (2010) Petrologic modelling of chloritoid-glaucophane schists from the NW Iberian Massif. Gondwana Res 17:377–391

    Article  Google Scholar 

  • Ludwig KR (2003) Isoplot 3.0: a geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication 4, 71 p

  • Maas R, Nicholls IA, Legg C (1997) Igneous and metamorphic enclaves in the S-type Deddick granodiorite, Lachlan Fold Belt, SE Australia: petrographic, geochemical and Nd–Sr isotopic evidence for crustal melting and magma mixing. J Petrol 38:815–841

    Article  Google Scholar 

  • Maluski H (1976) Intérêt de la méthode 40Ar/39Ar pour la datation des glaucophanes. Exemple des glaucophanes de l’île de Groix. Comptes-rendus de l’Académie des Sciences de Paris (D) 283:223–226

    Google Scholar 

  • Martínez Catalán JR, Arenas R, Díaz García F, González Cuadra P, Gómez-Barreiro P, Abati J, Castiñeiras P, Fernández-Suárez S, Sánchez Martínez S, Andonaegui P, González Clavijo E, Díez Montes A, Rubio Pascual FJ, Valle Aguado B (2007) Space and time in the tectonic evolution of the northwestern Iberian Massif. Implications for the Variscan belt. Geol Soc Am Mem 200:403–423

    Article  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 13:122–128

    Article  Google Scholar 

  • Mazur S, Turniak K, Bröcker M (2004) Neoproterozoic and Cambro-Ordovician magmatism in the Variscan Klodzko Metamorphic Complex (West Sudetes, Poland): new insights from U/Pb zircon dating. Int J Earth Sci 93:758–772

    Article  Google Scholar 

  • Ménot RP, Peucat JJ, Scarenzi D, Piboule M (1988) 496-My age of plagiogranites in the Chamrousse ophiolite complex (external crystalline massifs in the French Alps)–evidence of a lower Paleozoic oceanization. Earth Planet Sci Lett 88:82–92

    Article  Google Scholar 

  • Milord I, Sawyer EW, Brown M (2001) Formation of diatexite migmatite and granite magma during anatexis of semi-pelitic metasedimentary rocks: an example from St. Malo, France. J Petrol 42:487–505

    Article  Google Scholar 

  • Nance RD, Gutiérrez-Alonso G, Keppie JD, Linnemann U, Murphy JB, Quesada C, Strachan RA, Woodcock NH (2010) Evolution of the Rheic Ocean. Gondwana Res 17:194–222

    Article  Google Scholar 

  • Pearce JA (1983) Role of the sub-continental lithosphere in magma genesis at active continental margins. In: Hawkesworth CJ, Norry MJ (eds) Continental basalts and mantle xenoliths. Shiva, Nantwich, pp 230–249

    Google Scholar 

  • Pearce JA, Harris NBW, Tindle AG (1984) Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. J Petrol 25:956–983

    Google Scholar 

  • Pearce NJG, Perkins WT, Westgate JA, Gorton MP, Jackson SE, Neal CR, Chenery SP (1997) A compilation of new and published major and trace element data for NIST SRM 610 and NIST SRM 612 glass reference materials. Geostand Newsl 21:115–144

    Article  Google Scholar 

  • Peucat JJ (1986) Rb–Sr and U–Pb dating of the blueschists of the Ile de Groix. In: Evans BW, Brown EH (eds), Blueschists and eclogites, Geol Soc Am Mem 164:229–238

  • Peucat JJ, Cogné J (1977) Geochronology of some blueschists from ile de Groix, France. Nature 268:131–132

    Article  Google Scholar 

  • Philippon M, Brun JP, Gueydan F (2009) Kinematic records of subduction and exhumation in the Ile de Groix blueschists (Hercynian belt; Western France). J Struct Geol 31:1308–1321

    Article  Google Scholar 

  • Pin C, Carme F (1987) A Sm–Nd isotopic study of 500 Ma old oceanic crust in the Variscan belt of Western Europe–the Chamrousse ophiolite complex, Western Alps (France). Contrib Mineral Petrol 96:406–413

    Article  Google Scholar 

  • Pin C, Paquette JL, Santos Zalduegui JF, Gil Ibarguchi JI (2002) Early Devonian suprasubduction-zone ophiolite related to incipient collisional processes in the Western Variscan Belt: The Sierra de Careón unit, Ordenes Complex, Galicia. Geol Soc Am Spe Pap 364:57–71

    Google Scholar 

  • Plank T, Langmuir CH (1998) The chemical composition of subducting sediment and its consequences for the crust and mantle. Chem Geol 145:325–394

    Article  Google Scholar 

  • Pupin JP (1980) Zircon and granite petrology. Contrib Mineral Petrol 73:207–220

    Article  Google Scholar 

  • Quinquis H (1980) Schistes bleus et déformation progressive: l’exemple de l’île de Groix. Thèse de 3ème cycle, Université de Rennes, 145 pp

  • Quinquis H, Choukroune P (1981) Les schistes bleus de l’île de Groix dans la chaîne hercynienne: implications cinématiques. Bulletin de la Société Géologique de France (7) XXIII:409–418

  • Robardet M (1981) Evolution géodynamique du Nord-est du Massif armoricain au Paléozoïque Mém Soc Géol Min Bretagne 20, 342 pp

  • Rodríguez Aller J (2005) Recristalización y deformación de litologías supracorticales sometidas a metamorfismo de alta presión (Complejo de Malpica-Tuy, NO del Macizo Ibérico). Nova Terra 29:1–572

    Google Scholar 

  • Sánchez Martínez S, Arenas R, Díaz García FD, Martínez Catalán JR, Gómez-Barreiro J, Pearce JA (2007) Careón ophiolite, NW Spain: suprasubduction zone setting for the youngest Rheic Ocean floor. Geology 35:53–56

    Article  Google Scholar 

  • Schmitz MD, Bowring SA (2001) U–Pb zircon and titanite systematics of the Fish Canyon Tuff: an assessment of high-precision U–Pb geochronology and its application to young volcanic rocks. Geochim Cosmochim Acta 65:2571–2587

    Article  Google Scholar 

  • Schulz B, Triboulet C, Audren C, Pfeifer HR, Gilg A (2001) Two-stage prograde and retrograde Variscan metamorphism of glaucophane-eclogites, blueschists and greenschists from the Ile de Groix (Brittany, France). Int J Earth Sci 90:871–889

    Article  Google Scholar 

  • Schulz B, Bombach K, Pawlig S, Brätz H (2004) Neoproterozoic to Early-Palaeozoic magmatic evolution in the Gondwana-derived Austroalpine basement to the south of the Tauern Window (Eastern Alps). Int J Earth Sci 93:824–843

    Article  Google Scholar 

  • Simonetti A, Heaman LM, Chacko T, Banerjee NR (2006) In situ petrographic thin section U–Pb dating of zircon, monazite, and titanite using laser ablation MC-ICP-MS. Int J Mass Spectr 253:87–97

    Article  Google Scholar 

  • Stacey JS, Kramers JD (1975) Approximation of terrestrial lead isotope evolution by a two-stage model. Earth Planet Sci Lett 26(2):207–221

    Article  Google Scholar 

  • Stampfli GM, von Raumer J, Wilhem C (2011) The distribution of Gondwana-derived terranes in the early paleozoic. In: Gutiérrez-Marco JC, Rábano I, García-Bellido D (eds) Ordovician of the world. Cuadernos del Museo Geominero 14. Instituto Geológico y Minero de España, Madrid, pp 567–574

    Google Scholar 

  • Storey CD, Jeffries TE, Smith M (2006) Common lead-corrected laser ablation ICP–MS U–Pb systematics and geochronology of titanite. Chem Geol 227:37–52

    Article  Google Scholar 

  • Sun SS, McDonough WF (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders AD, Norry MJ (eds), Magmatism in ocean basins, Geol Society Lond Spec Pub 42:313–345

  • Taylor SR, McLennan SM (1981) The composition and evolution of the continental crust: rare earth element evidence from sedimentary rocks. Phil Trans R Soc Lond A301:381–399

    Article  Google Scholar 

  • Tera F, Wasserburg GJ (1972) U–Th–Pb systematics in three Apollo 14 basalts and the problem of initial Pb in lunar rocks. Earth Planet Sci Lett 14:281–304

    Article  Google Scholar 

  • Triboulet C (1974) Les glaucophanites et roches associées de l’île de Groix (Morbihan, France): étude minéralogique et pétrogénétique. Contrib Mineral Petrol 45:65–90

    Article  Google Scholar 

  • Valverde-Vaquero P, Dunning CR (2000) New U–Pb ages for the early ordovician magmatism in central Spain. J Geol Soc Lond 157:15–26

    Article  Google Scholar 

  • von Raumer J, Stampfli GM (2008) The birth of the Rheic Ocean–early palaeozoic subsidence patterns and tectonic plate scenarios. Tectonophysics 461:9–20

    Article  Google Scholar 

  • von Raumer JF, Stampfli GM, Borel G, Bussy F (2002) Organization of pre-Variscan basement areas at the north-Gondwanan margin. Int J Earth Sci 91:35–52

    Article  Google Scholar 

  • Wiedenbeck M, Allé P, Corfu F, Griffin WL, Meier M, Oberli F, von Quadt A, Roddick JC, Spiegel W (1995) Three nature zircon standards for U–Th–Pb, Lu–Hf, trace element and REE analyses. Geostand Newsl 19:1–23

    Article  Google Scholar 

  • Williamson BJ, Downes H, Thirlwall MF, Beard A (1997) Geochemical constraints on restite composition and unmixing in the Velay anatectic granite, French Massif Central. Lithos 40:295–319

    Article  Google Scholar 

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Acknowledgments

Field work has been allowed by the Scientific Committee of the Réserve Naturelle Nationale François Le Bail. Thanks to Fabio Capponi for providing XRF analyses and to Rossana Martini and Agathe Martignier for assistance with the SEM analyses. We are grateful to Larry Heaman for providing the Khan titanite standard and to Daniel Condon for providing the Fish Canyon Tuff titanite standard. Thanks to Catherine Robert for her help with the sampling on the island. Discussions with Blair Schoene, Maria Ovtcharova and Urs Schaltegger at various stages of this study were much appreciated. Constructive reviews of Jürgen von Raumer and Bernhard Schulz helped us to improve the earlier version of this manuscript. The editorial work of Wolf-Christian Dullo and Ingo Braun was greatly appreciated. The research was supported by project Nr. 20021-113280 of the Swiss National Science Foundation to S.Th. Schmidt and T.W. Vennemann.

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Author notes

  1. Afifé El Korh

    Present address: Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3012, Bern, Switzerland

Authors and Affiliations

  1. Department of Mineralogy, University of Geneva, Rue des Maraîchers 13, 1205, Geneva, Switzerland

    Afifé El Korh & Susanne Th. Schmidt

  2. Geosciences Rennes (UMR CNRS 6118), University of Rennes 1, 35042, Rennes Cedex, France

    Michel Ballèvre

  3. Institute of Mineralogy and Geochemistry, University of Lausanne, Anthropole, 1015, Lausanne, Switzerland

    Alexey Ulianov

  4. Geosciences Montpellier (UMR CNRS 6250), University of Montpellier 2, 34095, Montpellier Cedex 05, France

    Olivier Bruguier

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Correspondence to Afifé El Korh.

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El Korh, A., Schmidt, S.T., Ballèvre, M. et al. Discovery of an albite gneiss from the Ile de Groix (Armorican Massif, France): geochemistry and LA-ICP-MS U–Pb geochronology of its Ordovician protolith. Int J Earth Sci (Geol Rundsch) 101, 1169–1190 (2012). https://doi.org/10.1007/s00531-011-0732-5

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  • DOI: https://doi.org/10.1007/s00531-011-0732-5

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