 | | Journal (article/letter/editorial) | | core complexformation: southernBrittany metamorphic belt,FranceM I C H A E L BROWN' A N D R . D A...The high-grade migmatitic core to the southernBrittany metamorphic belt has mineralogical and textural...The high-grade migmatitic core of the southernBrittany metamorphic belt represents a type ofmetamorphic...high-grade migmatitic core within the southernBrittany metamorphic belt is characterized by mineralogical...T E C T ON I C F R A M E W O R KThe southernBrittany metamorphic belt is part of theEuropean Variscides |  | | Journal (article/letter/editorial) | | Schistsand Associated Rocks from Ile deGroix,Brittany,FranceA.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 deGroix, and their chemical,physical, optical and X-ray...suspected in a specimen of blue amphibole. Thebarroisite has a Compositionbetween glaucophane and hornblende...composition of the glaucophane schists of Ile deGroix 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 ofIle deGroixAluminousschistsCalcareousschistsBasicschists |  | | Journal (article/letter/editorial) | | Evidence for a Variscan suture zone in the Vendee,France:a petrological study of blueschist facies rocks...consideredto be the eastern equivalent of the Ile deGroixhigh-pressure metamorphic terrain. Petrological...Key-words: blueschists; chloritoid;phane; VendCe,France.glauco-INTRODUCTIONHigh pressure-low temperature...Languedoc, PI. E. Bataillon, 34060 MontpellierCedex,France.thickening of the lithosphere (Thompson &England...sporadic blueschists found mainly on the Ile deGroix(Cognt, Jeannette & Ruhland, 1966) and inthe South |  | | Journal (article/letter/editorial) | | a result offluid–rock interactions (Ile deGroix,France)A. El Korh a,⁎, S.Th. Schmidt a, T. Vennemann...6118), University of Rennes 1, 35042 Rennes Cedex,Francea r t i c l ei n f oArticle history:Received...different HP–LT metamorphic rocks of the Ile deGroixwere analysed to characterise geochemical fingerprints...variety ofmetamorphic assemblages on the Ile deGroix is thus directly related to the pre-HP rock composition...retrogression in the western part of the Ile deGroix primarily reflects stronger metasomatic intensities |  | | Journal (article/letter/editorial) | | glaucophanites et roches associ6esde File deGroix (Morbihan,France):6tude min6ralogique et p6trog6n6tique...Schists and Associated Rocks in Ile deGroix (Morbihan,France):A Mineralogical and Petrogenctic Study...mineralogic study of the different rock facies on fie deGroixshows that two metamorphic episodes have affected...s'incline progressivement vers l'est, l'fle deGroix a attir6 lespremiers chereheurs d~s la fin du sibcle...la constituent ; ~ 10 k m environde la rade deLorient, donc peu 61oign~e du continent, elle en diffbre |  | | Journal (article/letter/editorial) | | Deerite from Ile deGroix,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 deGroix deerites most closely resemble the Mn-poor, alpine...Sifnos deerites. The P - T conditions of the Ile deGroix 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. 165-181doi:10.1016/j.chemgeo.2016.11.017 | Journal (article/letter/editorial) | | 20, F-54501 Vandœuvre-lès-2MANancy Cedex,FranceGeoRessources, Université de Lorraine, CNRS, UMR...BPPTED70239, F-54506 Vandœuvre-lès-Nancy,FranceCE*Corresponding author: elkorh@crpg.cnrs-nancy...and pelitic micaschists fromMAthe Ile deGroix (France), to determine Ge and Ga behaviour and Ge isotope...and retrograde greenschist facies of the Ile deGroix, a well-known latePalaeozoic HP–LT terrane. In this...Geological setting and studied samplesThe Ile deGroix (France) is a Variscan HP terrain, bearing well-preserved |  | | Journal (article/letter/editorial) | | epidote blueschists from the Ile deGroix(Armorican Massif,France): a potential geobarometerM. BALLEVRE...Université de Rennes I, F-35042 Rennes CEDEX,France(Michel.Ballevre@Univ-rennes1.fr)2Microsonde...Plouzané,FranceABSTRACTThe garnet blueschists from the Ile deGroix (Armorican Massif,France) contain...Key words: Armorican Massif; blueschist; Ile deGroix; lawsonite pseudomorph; P–T history.INTRODUCTION...& Sindern, 2002)and the Variscan belt (Ile deGroix: Cogné et al., 1966;Felix & Fransolet, 1972). |  | | Journal (article/letter/editorial) | | in 1980.passed away 30 January 2019 in Paris (France). AfterWhile having a full research position,...geochemistry. TheseFIELD TRIP TO THE ÎLE DEGROIX(BRITTANY,FRANCE)The SFMC organized a two-day field trip...March 2019) to the ÎledeGroix (Groix Island) inBrittany in northwestFrance. The aim wasto explore...the island. The 21 attendees camefrom all overFrance and included a range of academic post-doctorates...(Géosciences Rennes), a longtime specialistin Île deGroix mineralogy and petrology who seemed to know byheart |  | | Journal (article/letter/editorial) | | 7S2S2, Paris Cedex,France'BRGM SGN CEO, BP 6009, 45060 Orl6ans La Source,France3Centre Armoricain...Ge'ologie, Universite de Rennes, 35042Rennes Cedex,FranceA B S TR A C T In order to illustrate different...limits forsymptomatic minerals (glaucophane,barroisite, chlorite,epidote). The estimated part of the...7 kbar); both unitslater evolved inside thebarroisite stability field towardsgreenschist facies conditions...the area of the Vilaine Riverestuary, SouthBrittany,France (Triboulet &Audren, 1985a,b, 1988)Only one |  | | Journal (article/letter/editorial) | | 5, Rue Kessler, UA 10, Clermont-Ferrand, 63038 (France)(Re~u le 7 octobre 1988; rdvision accept~e le...et sont parfois frang~s d'un mince liser~debarroisite. Cette derni~re, ~galement interstitielledans...centraledu grenat tandis que des inclusions debarroisite et d'omphacite se localisentdans la moitidexterne...~quilibre avec la paragen~se $clogitique; unebarroisite (III) bleu-vert, peuabondante et interstitielle;de...~quilibre avec la paragen~se ~clogitique; (5)barroisite (III) interstitieUe; (6) hornblende actinolitique |  | | Journal (article/letter/editorial) | | subduction‑related high‑pressuremetabasites (Ile deGroix,France)Afifé El Korh1,2 · Béatrice Luais1 · Etienne...and retrograde greenschists) fromthe Ile deGroix (France), a Variscan high-pressure terrane, to determine...Pauvres, BP 20,54501 Vandœuvre‑Lès‑Nancy Cedex,France2Unit of Earth Sciences, Department of Geosciences...hydrothermally alteredmetabasites (Ile deGroix,France) of prograde blueschistand eclogite facies...greenschist facies from theIle deGroix (Armorican Massif,France), a well-knownVariscan HP–LT unit |  | | Journal (article/letter/editorial) | | (3.4–3.3 Si p.f.u.) + paragonite + winchite +barroisite + hornblende + chloritoid + chlorite +epidote...several high-P terranes around the world (e.g. Île deGroix, Kiénast and Triboulet, 1972; the Kaczawa Complex...certain geological units of the Armorican Massif (Brittany)Fig. 1. Schematic geological maps and cross...allows correlation of the latter with the ÎledeGroix (Kiénast and Triboulet, 1972; Shelley and Bossière...glaucophane.They include bluish-green winchite andbarroisite, and smalleramounts of green hornblende and |  | | Journal (article/letter/editorial) | | Socles, Universitt de Rennes 1, 35042 Rennes Cedex,FranceAbstract. Crystal-chemical relationships between...actinolite and glaucophane orglaucophane andbarroisite have been reportedby numerous authors (Robinson...i.e. barroisitic amphiboles. During stageC,barroisite forms epitactic overgrowths onglaucophane (Fig...is characterized by the development of albite-barroisitesymplectites at intergranular boundaries. Such...on glaucophane (stage C). In thesymplectiticbarroisite-plagioclase intergrowths(stage D), grains are |  | | Journal (article/letter/editorial) | | of the rock.Omphacite + garnet + paragonite +barroisite + epidote + rutile/iknenite + quartz + pyrite...diablastic amphibole intergrowth. Dark grey =barroisite; light grey =hornblende; interstices (black)...terminology as in Fig. 5.bulk of the amphibole isbarroisite, while the thin alteration rims forming along...along grain boundaries and cleavage partings inbarroisite, is evident(Fig. 4). Analyses of the chlorite...single composition(Table 5). For amphibole abarroisite composition has been used for calculations,because |  | Guo, S., Ye, K., Wu, T. F., Chen, Y., Yang, Y. H., Zhang, L. M., Liu, J. B., Mao, Q., Ma, Y. G. (2013) A potential method to confirm the previous existence of lawsonite in eclogite: the mass imbalance of Sr and LREEs in multistage epidote (Ganghe, Dabie UHP terrane)Journal of Metamorphic Geology, 31 (4) 415-435doi:10.1111/jmg.12027 | Journal (article/letter/editorial) | | minerals (garnet, omphacite, quartz, kyanite,barroisite, phengite and accessory minerals) play a very...found multistageepidote in eclogite from Ile deGroix and suggestedthat the early-stage epidote with...exhumation process, resulting in the formation ofbarroisite and phengite porphyroblasts as well as the rims...vol.%), kyanite (~6vol.%), quartz (~7 vol.%),barroisite (~7 vol.%) andphengite (~3 vol.%), which occur...UHP conditions(Guo et al., 2012). Later-stagebarroisite and phengite always occur as porphyroblasts and |  | | Journal (article/letter/editorial) | | retrogressivealteration to amphibole (glaueophane and/orbarroisite)-bearing assemblages (e.g.Makanjuola and Howie...schists and associatedrocks from fie deGroix,Brittany,France. Contr. Mineral. and Petrol. 35, 83-118 |  | | Journal (article/letter/editorial) | | + PgCzQWGlaucophane-bearingassemblagesBarroisite-bearingassemblagesCGro, Jd, AbFOmphHed...facies assemblagepargasite + albite ± epidote.Barroisite is overgrownby pargasitic amphibole, which coexists...+ Ep + Q + Ru + Sph(Gar–Bar–Ab assemblage).Barroisite is overgrown bymagnesio-hornblende. Albite appears...from garnet–barroisite–albite assemblages;Β, from eclogitic assemblages, garnet–barroisite–omphacite....eclogite-facies metapelites from Champtoceaux Nappe (Brittany,France). Journal of Petrology 30, 1321–1349.Berman |  | | Journal (article/letter/editorial) | | Université d’Orléans, BP 6759, 45067-Orléans,FrancecLaboratoire de Géophysique, Tectonique et Sédimentologie...UMII, Pl. E. Bataillon, 34095 Montpellier Cédex,FranceReceived 14 November 2001; accepted 10 July 2002...Sodic amphibole commonly shows replacementbybarroisite, and there is continuous petrographic transition...transition from blueschist – metabasites tobarroisite-bearing epidote –amphibolites. Eclogite with the mineral...developmentofbarroisite-bearing epidote – amphibolites. Phengite, sodic amphibole andbarroisite Ar/Ar ages |  | | Journal (article/letter/editorial) | | is rimmed by Ca-Na amphibole(barroisite) or a symplectite ofbarroisite + albite(Fig. 3D). Fine-grained...varyingamounts of glaucophane, Ca-Na amphibole (barroisite), epidote (zoisite or clinzoisite), paragonite...inclusions in garnet cores,or withinbarroisite (Figs. 4B and 4C).Barroisiteoccurs either as (1) coarse-grained...after omphacites or aroundgarnets (Fig. 4D).Barroisite also occurs as rimsaround omphacites. Paragonite...grew along fractures ingarnets, omphacites, andbarroisite prophyroblasts,suggesting that chlorite must |  | | Report (article/chapter) | | southern Britain and northwestFrance.By comparison with N WFrance and the Channel Islands, Precambrian...(Monian/Avalonian/Cadomian) rocks in Canada, British Isles and NWFrance. A, Anglesey; L, Ll~n peninsula.ignimbritic Arfon...magnesio-hornblende to actinolitic hornblende,actinolite andbarroisite. Both blueschists andgneissic rocks occur as...progressive transformation of actinoliteinto firstbarroisite and then sodic amphibole ina reaction that may...ancient orogenic belts (e.g.on the Isle deGroix in westernBrittany).However, there is a danger that by adopting |  | LÜ, Z., ZHANG, L., DU, J., BUCHER, K. (2009) Petrology of coesite-bearing eclogite from Habutengsu Valley, western Tianshan, NW China and its tectonometamorphic implication.Journal of Metamorphic Geology, 27 (9) 773-787doi:10.1111/j.1525-1314.2009.00845.x | Journal (article/letter/editorial) | | garnet, omphacite, paragonite, glaucophane andbarroisite, minor amounts of rutile and dotted (or banded)...for Coe(coesite), Cha (chalcedony) and Bar (barroisite).GEOLOGICAL SETTINGThe Chinese western Tianshan...relatively fresh eclogiteare omphacite, garnet,barroisite (and ⁄ or glaucophane), epidote (or clinozoisite)...filled with albite in Fig. 3f). Rare fine-grainedbarroisite was found in the garnet (Figs S1 & S2).Coesite...Publishing Ltdmonly rimmed by secondarybarroisite.Barroisiteformation may be related to retrograde |  | | Journal (article/letter/editorial) | | Université de Rennes 1, F-35042 Rennes Cedex,France2Institut pour la Recherche et le Développement...Chaînes Alpines, BP 53,F-38041 Grenoble Cedex 9,France3Institut de Minéralogie et Géochimie, Université...been performed with the Microsonde Ouest(Brest,France). In both cases, operating conditions were:15...amphibole being aglaucophane and/or abarroisite, or abarroisite rimmed byglaucophane (Raspas Complex:...are consistent with glaucophane overgrowths onbarroisite (Koons, 1982; Tropper & Essene, 2002;Gabriele |  | | Journal (article/letter/editorial) | | www.elsevier.com/locate/lithosChloritoid andbarroisite-bearing pelitic schists from the eclogiteunit...eclogite and noneclogite units.Chloritoid andbarroisite-bearing pelitic schists occur as interlayers...matrix phases of the schists are garnet, chlorite,barroisite,paragonite, phengite, and quartz. Eclogite facies...estimated using equilibria among chloritoid,barroisite, chlorite, interlayeredchlorite–talc, paragonite...Eclogite; Pelitic schist; P–T trajectory; Chloritoid;Barroisite* Corresponding author. Tel./fax: +81 52 789 |  | | Journal (article/letter/editorial) | | Aln, allanite; Ap, apatite; Aug, augite; Bar,barroisite; Bt, biotite;Cc, calcite; Chl, chlorite; Cpx...porphyroblasts are usually overgrown bywinchite orbarroisite (Table 4), and appear to havecrystallized later...and fractures,and of matrix clinopyroxene withbarroisite–winchite+albite+magnetite±epidote. In a few...Most epidote amphibolites are fine grained.Barroisiteand winchite occur as prismatic or fibrous, randomly...replacement of clinopyroxene, garnet andglaucophane bybarroisite or winchite+magnetite+albite+epidote+chlorite |
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