 | | Journal (article/letter/editorial) | | Pressure Meta-Acidites from Lorient-Concarneau Area (South Brittany, France) C. Triboulet Laboratoire de... Paris VI, 4 place Jussieu, 75230 Paris Cedex, France Abstract. New d a t a were obtained from mineralogical...episodes affecting the detrital series between Lorient and Concarneau. Bulk rock chemistry, Si 4 + contents...conditions known in South Brittany is given. Introduction Meta-acidites between Lorient and C o n c a r n e...5 ~ ! e~ 10 km Fig, 1. Sketch map of the Lorient-Concarneau area. -- - -- metaacidites. IdR, ~le |  | Bosse, Valérie, Féraud, Gilbert, Ballèvre, Michel, Peucat, Jean-Jacques, Corsini, Michel (2005) Rb–Sr and 40Ar/39Ar ages in blueschists from the Ile de Groix (Armorican Massif, France): Implications for closure mechanisms in isotopic systems. Chemical Geology, 220 (1) 21-45 doi:10.1016/j.chemgeo.2005.02.019 | Journal (article/letter/editorial) | | ages in blueschists from the Ile de Groix (Armorican Massif, France): Implications for closure mechanisms... 5, rue Kessler, 63038 Clermont Ferrand Cedex, France b Géosciences Azur (UMR-CNRS 6526), Université...Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France c Géosciences Rennes (UMR-CNRS 6118), Université...Université de Rennes 1, 35042 Rennes Cedex, France Received 1 October 2003; accepted 28 February 2005 Abstract...obtained on phengite from the HP/LT rocks from the Ile de Groix (Armorican Massif, France), which represents |  | | Journal (article/letter/editorial) | | glaucophanites et roches associ6es de File de Groix (Morbihan, France): 6tude min6ralogique et p6trog6n6tique...Schists and Associated Rocks in Ile de Groix (Morbihan, France): A Mineralogical and Petrogenctic Study...mineralogic study of the different rock facies on fie de Groix shows that two metamorphic episodes have affected...s'incline progressivement vers l'est, l'fle de Groix a attir6 les premiers chereheurs d~s la fin du sibcle...la constituent ; ~ 10 k m environ de la rade de Lorient, donc peu 61oign~e du continent, elle en diffbre |  | | Journal (article/letter/editorial) | | core complex formation: southern Brittany metamorphic belt, France M I C H A E L BROWN' A N D R . D A...The high-grade migmatitic core to the southern Brittany metamorphic belt has mineralogical and textural...The high-grade migmatitic core of the southern Brittany metamorphic belt represents a type of metamorphic...high-grade migmatitic core within the southern Brittany metamorphic belt is characterized by mineralogical...T E C T ON I C F R A M E W O R K The southern Brittany metamorphic belt is part of the European Variscides |  | | Journal (article/letter/editorial) | | from the estuary ofthe river Vilaine, South Brittany, France ~ C L A U D E TRIHOULET, Lahoraioire de Peirologie...Marie Curie, 4 , place Jussiru, 75230 Paris Cedex, France C L A U D E A U D R E N , Centre Arrnoricain &Etude...Rennes, campus de Beaulieu, 35042 Rennes Cedex, France Abstract. Microprobe analysis of the continuous...microstructures; orogenic processes; PTtd path; South Brittany; thermobarometry INTRODUCTION Calculation of...micaschist samples from the river Vilaine, South Brittany. General geology The micaschists from the estuary |  | | Journal (issue) | | Naturelle (Paris). Loodmineralen, door Multi Axes France, met wulfeniet, crocoiet, recent ontgonnen galeniet...storthopen zijn privaat terrein ! 3. Morbihan : Ile-de-Groix Als laatste gebied op onze zoektocht door... van het eiland lle-de-Groix, een parel van een eiland in de Golf du Morbihan. Op het eiland is er nooit...Door zijn uitzonderlijke ligging voor de baai van Lorient heeft het een aangenaam klimaat Merkwaardige rotspartijen...Sci. de France, 38 session, Saint Brieux, t.2, 28-31. CHAURIS L., LA BAIL F. (1978) "Ile de groix, Morbihan" |  | | Journal (article/letter/editorial) | | facies rocks from the ile de Groix, Armorican Massif (northwest France) J. BERNARD-GRIFFITHS, M.S.N....LITHOS Universitd de Rennes 1, 35042 Rennes C~dex (France} Bernard-Griffiths, J,, Carpenter, M.S.N., Peucat...blueschist facies rocks from the he de Groix, Armorican Massif (northwest France). In: W.L. Griffin (Editor), Second...Sampling includes the main rock types exposed on Groix, concentrating on those metabasic rocks with least...alkali-basalt debris. The volcanicsedimentary assemblage on Groix is suggestive of ocean-island magmatic activity |  | | Journal (article/letter/editorial) | | Schists and Associated Rocks from Ile de Groix, Brittany, France A.A. M a k a n j u o l a * a n d R.A. Howie...were obtained from the metamorphic rocks of lie de Groix, and their chemical, physical, optical and X-ray...composition of the glaucophane schists of Ile de Groix is given i n T a b l e 1. N i n e t y - s e v e...composition of the glaucophane schists of Ile de Groix Phengite Quartz Chloritoid Plagioclase Chlorite Glaucophane...schists a n d a s s o c i a t e d rocks of I l e de Groix h a v e been r a t h e r few. B a r r o i s (1884) |  | | Report (chapter) | | crustal-scale d&ollement (Hercynian Belt of South Brittany, France) F. L E H E B E L , D. G A P A I S , S. F...Universitd de R e n n e s 1, 35042, R e n n e s cedex, France (e-mail: F l o r e n c e . L e - H e b e l @ u...d&ollement zone from the Hercynian Belt of South Brittany. At regional scale, deformations resulted in large...large-strain unit from the Hercynian belt of South Brittany, which was downthrust to about 25km, exhumed,...late-orogenic extension. Geological setting South Brittany (Western France) is part of the internal zones of the |  | | Journal (article/letter/editorial) | | Evidence for a Variscan suture zone in the Vendee, France: a petrological study of blueschist facies rocks...considered to be the eastern equivalent of the Ile de Groix high-pressure metamorphic terrain. Petrological...Key-words: blueschists; chloritoid; phane; VendCe, France. glauco- INTRODUCTION High pressure-low temperature...Languedoc, PI. E. Bataillon, 34060 Montpellier Cedex, France. thickening of the lithosphere (Thompson & England...sporadic blueschists found mainly on the Ile de Groix (Cognt, Jeannette & Ruhland, 1966) and in the South |  | | Journal (article/letter/editorial) | | rocks (estuary of the River Vilaine, South Brittany, France) CI. TRIBOULET, Laboratoire de Pitrologie...Marie Curie, 4 place Jussieu, 75252 Paris Cedex, France CI. AUDREN, Centre Armoricain d'Etude Structurale...Rennes, Campus de Beaulieu, 35042 Rennes Cedex, France Abstract. Edeniteltremolite and edenite/magnesio-hornblende...orogeny; microstructures; P-T-t-d paths; South Brittany, France; stacking effect during collision processes;...Furthermore, a great number of geothermometers (phengite-garnet, Krogh & Raheim, 1975; Green & Hellman |  | | Journal (article/letter/editorial) | | a result of fluid–rock interactions (Ile de Groix, France) A. El Korh a,⁎, S.Th. Schmidt a, T. Vennemann...6118), University of Rennes 1, 35042 Rennes Cedex, France a r t i c l e i n f o Article history: Received...different HP–LT metamorphic rocks of the Ile de Groix were analysed to characterise geochemical fingerprints...variety of metamorphic assemblages on the Ile de Groix is thus directly related to the pre-HP rock composition...retrogression in the western part of the Ile de Groix primarily reflects stronger metasomatic intensities |  | | Journal (article/letter/editorial) | | socles, Universitk de Rennes I, 35042 Rennes Cedex, France Abstract. A detailed study of garnet-chloritoid...(HP) metapelitic rocks. In addition to quartz, phengite, paragonite and rutile, the micaschists display...chloritoid are known, for example in the Ile de Groix 136 J.P. Vuichard & M. Ballivre (Velde, 1967;...most common high-pressure assemblage is quartz t phengite + paragonite + garnet chloritoid. Though kyanite...1984; Koons, 1986). They both include quartz + phengite + garnet + rutile and differ by the presence of |  | | Journal (article/letter/editorial) | | epidote blueschists from the Ile de Groix (Armorican Massif, France): a potential geobarometer M. BALLEVRE...Université de Rennes I, F-35042 Rennes CEDEX, France (Michel.Ballevre@Univ-rennes1.fr) 2 Microsonde...Plouzané, France ABSTRACT The garnet blueschists from the Ile de Groix (Armorican Massif, France) contain...Key words: Armorican Massif; blueschist; Ile de Groix; lawsonite pseudomorph; P–T history. INTRODUCTION...& Sindern, 2002) and the Variscan belt (Ile de Groix: Cogné et al., 1966; Felix & Fransolet, 1972). |  | | Journal (article/letter/editorial) | | (Ab). A projection from quartz (Qz), H 2 0 and phengite (Ph) on the ( A 1 2 0 3 + F % O a ) - ( F e O...from Oman, New Caledonia, Seward Peninsula, Ile de Groix, Sifnos and Peloponnese, where G l n + Ctd bearing...t e ; Omph = Omphacite; Pg = Paragonite; Ph = Phengite; Prl = Pyrophyllite; Qz = Quartz; R t = Rutile;...Roever 1956; Zermatt Saas, Bearth 1967; Ile de Groix, Velde 1967). The rarity of this assemblage led...chlorite and paragonite in metapelites from Ile de Groix. Katagas (1980) reached the same conclusion after |  | | Journal (article/letter/editorial) | | Eclogites from "Massif Armoricain" (East of Nantes, France) G. Godard 1, J.-R. Kienast 2 and B. Lasnier 1...chemin de la Houssini~re, F-44072 Nantes Cedex, France 2 Laboratoire de P6trographie, Universit+ Pierre...Curie, 4 place Jussieu, F-75230 Paris Cedex 05, France Abstract. A petrological and mineralogical study...eclogite occurring near Nantes (MassifArmoricain, France) has enabled us to characterize this amphibole...(West France). In this area, three occurrences of this mineral are known: Ile de Groix (Morbihan), Bois |  | | Journal (article/letter/editorial) | | collected from three outcrops on Ile de Groix (Morbihan) France, each being not more than one kilometer...experimental work was ~hat the St+4 content of the phengite micas is directly related to their physical conditions...and petrology of the Ile de Groix and the neighbouring coastal area of France has been examined most recently...the Southern Britany coast. The geology of Ile de Groix itself is complex in structural, metamorphic and...the late metamorphic history which produced the phengite micas. The samples were collected in and around |  | Paquette, J.-L., Ballèvre, M., Peucat, J.-J., Cornen, G. (2017) From opening to subduction of an oceanic domain constrained by LA-ICP-MS U-Pb zircon dating (Variscan belt, Southern Armorican Massif, France) Lithos, 294. 418-437 doi:10.1016/j.lithos.2017.10.005 | Journal (article/letter/editorial) | | dating (Variscan belt, Southern Armorican Massif, France) J.-L. Paquette, M. Ballèvre, J.-J. Peucat, G...dating (Variscan belt, Southern Armorican Massif, France). The address for the corresponding author was...dating (Variscan belt, Southern Armorican Massif, France). J.-L. Paquettea, M. Ballèvreb, J.-J. Peucatb...Clermont-Ferrand, France Géosciences Rennes (UMR 6118), Université de Rennes , 35042 Rennes Cedex, France c Laboratoire...Planétologie et de Géodynamique (UMR 6112), Nantes, France US CR b AN Keywords: U-Pb zircon, LA-ICPMS |  | | Journal (article/letter/editorial) | | Deerite from Ile de Groix, Brittany, France K. DUDE~ Academy of Mining and Metallurgy, Institute of Geology... Curie, 4 place Jussieu, 75252 Paris Cedex 05, France Abstract Deerite has been found in layers of Fe-rich...described in the literature show that the Ile de Groix deerites most closely resemble the Mn-poor, alpine...Sifnos deerites. The P - T conditions of the Ile de Groix metamorphism do not conform with the stability field...metamorphism. KEYWORDS: deerite, metamorphism, Brittany, France Introduction THE hydrous iron-rich silicate |  | El Korh, Afifé, Luais, Béatrice, Boiron, Marie-Christine, Deloule, Etienne, Cividini, Damien (2017) Investigation of Ge and Ga exchange behaviour and Ge isotopic fractionation during subduction zone metamorphism. Chemical Geology, 449. 165-181 doi:10.1016/j.chemgeo.2016.11.017 | Journal (article/letter/editorial) | | 20, F-54501 Vandœuvre-lès- 2 MA Nancy Cedex, France GeoRessources, Université de Lorraine, CNRS, UMR...BP PT ED 70239, F-54506 Vandœuvre-lès-Nancy, France CE *Corresponding author: elkorh@crpg.cnrs-nancy...and pelitic micaschists from MA the Ile de Groix (France), to determine Ge and Ga behaviour and Ge isotope...and retrograde greenschist facies of the Ile de Groix, a well-known latePalaeozoic HP–LT terrane. In this...Geological setting and studied samples The Ile de Groix (France) is a Variscan HP terrain, bearing well-preserved |  | | Journal (article/letter/editorial) | | in 1980. passed away 30 January 2019 in Paris (France). After While having a full research position,...geochemistry. These FIELD TRIP TO THE ÎLE DE GROIX (BRITTANY, FRANCE) The SFMC organized a two-day field trip...March 2019) to the Île de Groix (Groix Island) in Brittany in northwest France. The aim was to explore...the island. The 21 attendees came from all over France and included a range of academic post-doctorates...(Géosciences Rennes), a longtime specialist in Île de Groix mineralogy and petrology who seemed to know by heart |  | | Journal (article/letter/editorial) | | ASSOCIATED ROCKS IN THE HERCYNIAN BELTOF SOUTH BRITTANY, FRANCE J.L. PAQUETTE’, J.J. PEUCAT’, J. BERNARD-GRIFFITHS’...Gdologie, 35042 Rennes Ckdex (France) et Pktrologie, 44072 Nantes Ce’dex (France) December 12, 1984) Abstract...associated rocks in the Hercynian belt of south Brittany, France. In: D.C. Smith and Ph. Vidal (Guest-Editors)...an eclogite of the Champtoceaux Complex, south Brittany, has yielded an upper intercept age of 2208 f...existence of relics of a Precambrian basement in south Brittany. The geological history of this basement can be |  | Ballèvre, M., Fourcade, S., Capdevila, R., Peucat, J.-J., Cocherie, A., Fanning, C. Mark (2012) Geochronology and geochemistry of Ordovician felsic volcanism in the Southern Armorican Massif (Variscan belt, France): Implications for the breakup of Gondwana. Gondwana Research, 21 (4) 1019-1036 doi:10.1016/j.gr.2011.07.030 | Journal (article/letter/editorial) | | in the Southern Armorican Massif (Variscan belt, France): Implications for the breakup of Gondwana M. Ballèvre...Rennes Cedex, France Open University, Chemin de Bédilières, 34120 Lézignan-la-Cèbe, France BRGM (MMA/ISO)...C. Guillemin, BP 36009, 45060 Orléans cedex 2, France d Research School of Earth Sciences, ANU, Canberra...volume of the South Armorican domain (Variscan belt, France). Their age and geochemistry are the first focus...Precambrian crustal evolution of Western Europe (Iberia, France, Germany) is marked by the development of the Cadomian |  | | Journal (article/letter/editorial) | | Montpellier 2, Place E. Bataillon, 34095 Montpellier, France † Geological Institute of the Academy of Sciences...minerals were analysed in this sample: biotite and phengite. Three grains of biotite were analysed together...last step gives an older age of 332 ± 10 Ma. The phengite in this sample gave scattered increasing ages...is a blueschist characterized by low content of phengite. The age spectrum of this mineral is complex with...taken in the Sněžný potok Valley (EK-53B), is a phengite rich blueschist. Two separate analyses were performed |  | | Report (chapter) | | 6118,Université de Rennes I, 35042 Rennes Cedex, France 2 Departamento de Geologı́a, Universidad de Salamanca...Clermont-Ferrand, 5 rue Kessler, 63000 Clermont-Ferrand, France *Corresponding author (e-mail: michel.ballevre@univ-rennes1...the similarities to the terrains of Cornwall and Brittany and the fact that both folded regions continue...nine zones, most of them continuing into western France. The authors also established a tectonic zoning...granitic orthogneisses in Spain, ‘porphyroı̈des’ in France (Le Hébel et al. 2002, 2007). They are derived |
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