 | | Journal (article/letter/editorial) | | SOURCE OF JADE USED FOR POLISHED STONE AXES IN BRITTANY SIR,—Since my paper on Jade axes from sites in...information bearing on the search for a source of jadeite in Brittany. This information is contained in a paper...the petrography of the polished stone axes of Brittany and in two papers by J. Cogne on the crystalline...crystalline schists and granites of southern Brittany. In their 1957 paper the authors state that in some of...of He de Groix. In the same paper they also record the finding " dans les champs " of a jadeite-rock with |  | | 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) | | 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) | | 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...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) |  | | 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) | | 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 |  | | 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) | | 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) | | 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...chlorite coesite cordierite chloritoid garnet jadeite kyanite lawsonite paragonite quartz sillimanite...chloritoid are known, for example in the Ile de Groix 136 J.P. Vuichard & M. Ballivre (Velde, 1967;...end-members and for omphacites with 50 mol.% of jadeite, assuming that the H 2 0 activity equals 1 (see...after Maresch (1977). (Cx) Champtoceaux nappe, Brittany, France. (DM) Dora-Maira nappe, Western Alps. (Fa) |  | | 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 |  | | 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 |  | | Catalog/List | | 1973 Mail Order Only Minerals principally from FRANCE and IRELAND. All the min~rals were collected by...Omphacite. An Eclogite rock type. (Tulle, Correze, France) 2 x 2 I Op. lb. 30p. to 18 x 9 ins. 3. ANALCITE...breakages, in dark, dense Schist. (Salle de Rohan, Brittany, France) 1 x 2 1 Op. 2 x 2 20p. lb. 70p. to 12 x 12...Pyrite. The Andalusite is FL SW white. {Glomel, Brittany, France) 2 x 2 20p. 2 x 4 40p. lb. 60p. to 12 x 12...inclusions of glassy Plagioclase. (La Chevade, Murat, France) 1 x 2 l0p. 2 x 2 20p. lb. S0p. 7. APATITE, small |  | | Journal (article/letter/editorial) | | SOURCE OF JADE USED FOR POLISHED STONE AXES IN BRITTANY SIR,—Since my paper on Jade axes from sites in...information bearing on the search for a source of jadeite in Brittany. This information is contained in a paper...the petrography of the polished stone axes of Brittany and in two papers by J. Cogne on the crystalline...crystalline schists and granites of southern Brittany. In their 1957 paper the authors state that in some of...of He de Groix. In the same paper they also record the finding " dans les champs " of a jadeite-rock with |  | | Journal (article/letter/editorial) | | calculating all possible reactions among Gln, Ctd, Chl, jadeite (Jd), Ab, Gt, Pg, talc (Tc), pyrophyllite (Prl)...from Oman, New Caledonia, Seward Peninsula, Ile de Groix, Sifnos and Peloponnese, where G l n + Ctd bearing...phase "i"; Hem = Hematite; Ilm = Ilmenite; Jd=Jadeite; Ky=Kyanite; L w s = L a w s o n i t e ; M g t...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) | | Universit~ d'Orl~ans, B.P. 6759, F-45067 Orleans, France Received February 1, 1993 AcceptedAugust 4, 1993...like glaucophane and jadeite have lower values (Glancophane: 2.69 x 10-5K-*; Jadeite: 2.81 x 1 0 5 K -1)...et al. 1992); C, San Andrea di Cotone, Corsica, France (Caron et al. 1981 ; Verni6 et al. 1986; Fournier...Schliestcdt 1984; Brown 1986); G, lle de Groix, Brittany, France (Barrientos 1992; Barrientos and Selverstone...Corsica (France; cf. Verni6 et al. 1986; "C" box in Fig. 9), and in the lle de Groix (Bretagne, France; Dudek |  | | Journal (article/letter/editorial) | | glaucophane 386 302825- Amphibole + 2 Ou~tz + Jadeite 2422- 20- o,~'~ ZZ E,o,tD] 18/ / 16- I-...80%) + quartz + jadeite was observed. These mixtures of amphibole + quartz + jadeite recrystallized almost...glaucophane seed, jd = jadeite.* Note that at 800°C, 28 kbar, the assemblage amphibole + jadeite + melt (+ fluid)...expected [18]. The observed assemblage amphibole + jadeite + quartz can be explained by the loss of the aqueous... synthesized from gel. Amphibole 2 + quartz + jadeite, synthesized from sodic smectite + albite. hydrothermal |  | | Journal (article/letter/editorial) | | metacherts and pyroxenes intermediate between jadeite and diopside (omphacite) from basic rocks. I n...silicates in the in situ rocks suggest equilibrium. Jadeite has not been found either in the Ou6goa district...below the albite ~ jadeite + q u a r t z breakdown temperature, suggests jadeite is unlikely to be found...sediments are intermediate between diopside and jadeite; omphacites occurring in basic rocks have higher...gneisses. 284 P.M. Black JADEITE IMPURE JADEITE OMPHACI TE JADEITE /CC 9833 ":~ 10708 ~10675 |  | | Journal (article/letter/editorial) | | 5, Rue Kessler, UA 10, Clermont-Ferrand, 63038 (France) (Re~u le 7 octobre 1988; rdvision accept~e le...granoblastique, le rapport X M g (~80) et la teneur en jadeite (42-46%, rarement 36%) varient peu. La composition...grenats montrent une diminution de la teneur en jadeite entre 45 et 33% (et une augmentation du rapport...° C). En rabsence de plagioclase, la teneur en jadeite de l'omphacite donne des indications de pressions...Experimental determination of the reaction paragonite=jadeite+kyanite+H20 and internally consistent thermodynamic |  | | Journal (article/letter/editorial) | | Champtoceaux complex of the Armorican Massif in France (Ballèvre et al., 1994); in like manner, the Upper...Oceanic Unit can be correlated with the Île de Groix metabasites and metasediments in the same area (Shelley...4 Lawsonite þ Jadeite ¼ Quartz þ 2 Zoisite þ Paragonite þ H2 O 9 Lawsonite þ 2 Jadeite þ 3 Diopside ¼...interpreted in the same way in metabasites from Île de Groix (Felix, 1972), western Alps (Pognante, 1989) and...eclogite-facies conditions, as can be seen in jadeite-bearing metagranitoids (Gil Ibarguchi, 1995) and |  | | Journal (article/letter/editorial) | | al. / Gondwana Research 22 (2012) 20–25 Île de Groix Study area VARISCAN BELT Allochthonous complexes...(published in this article) and from Île de Groix, France (Philippon et al., 2009). arc detached from...system described here is also exposed in Île de Groix, France (Fig. 1). There, Philippon et al. (2009) reported...from the Armorican Massif. However, the Île de Groix lithologies and tectonometamorphic evolution are...the structural position is equivalent in Île de Groix, and the Ibero-Armorican Arc is restored to a straight |  | | Book | | face (ie end-section). Granite; St. Jacut, Brittany, France. (d) Anhedral spessartine garnet; Nisserdal...twinning (plagioclase) in granite; St.Jacut, Brittany, France; c) cross-hatched twinning (microcline) in...glaucophane schist (blueschist); Ile de Groix, Brittany, France. x100 81 Intense prussian blue-indigo...Oxo-hornblende phenocryst in andesite; Plomb du Cantal, France. x100 85 Note: The black iron-oxides often seen...PPL 47 JADEITE( ◻ ) x100 Jadeite (end section) in blueschist; Ile de Groix, Brittany, France. Note: |  | | Journal (article/letter/editorial) | | Socles, Universitt de Rennes 1, 35042 Rennes Cedex, France Abstract. Crystal-chemical relationships between...Di = diopside GI = glaucophane Gt = garnet Jd = jadeite Kf = potassium felspar Ky = kyanite Lw = lawsonite...whether quartz is present or not (around 40% of jadeite component). Sample B A R 6 also contains the two...data we have obtained. Pressure estimates 1. The jadeite content of omphacites is around 35-40 mo1.Y' in...maximum pressure at around 20 kbar at 500°C. 3. Jadeite + quartz assemblages have been reported in eclogitic |  | Oberti, Roberta, Boiocchi, Massimo, Smith, David C., Medenbach, Olaf, Helmers, Henk (2008) Potassic-aluminotaramite from Sierra de los Filabres, Spain. European Journal of Mineralogy, 20 (6) 1005-1010 doi:10.1127/0935-1221/2008/0020-1837 | Journal (article/letter/editorial) | | d’Histoire Naturelle, 61 Rue Buffon, 75005 Paris 4 France & Laboratoire de Tectonique, CNRS UMR7072, Université...Université Paris VI, 4 Place Jussieu, 75005, Paris, France 5 Institut für Geologie, Mineralogie und Geophysik...Aluminotaramite was later found on Ile Dumet, Brittany, France where the depressurisation retrogression trend...(LiF); Cr, Cr metal (PET); Mg, periclase (TAP); Na, jadeite (TAP); K, orthoclase (PET); F, synthetic fluorophlogopite...(1999): Ile Dumet (Brittany) and its glaucophane eclogite: the little sister of Ile de Groix? Mineralogical |  | | Journal (article/letter/editorial) | | according to Currie & Curtis (1976); (6): low albite = jadeite + quartz (see text); (7): stability field of barroisitic...pyroxene, curve (5) was obtained for the least jadeite-rich omphacite. Other compositions require pressures...Maximum pressures are given by the reaction albite = jadeite + quartz (curve 6), for albite is a stable mineral...lawsonite des glaucophanoschistes de l'lle de Groix (Bretagne—France): considerations sur la possibility d'une... P., & Kiss, E., 1968. Eclogite and almandine-jadeite-quartz rock from the Guajira Peninsula, Colombia |
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