 | | 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 |  | | 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) | | 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) | | 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) | | Fe-Al-celadonite enstatite pyrophyllite quartz Fe-stilpnomelane talc Al-talc PY Gru Kao Kf Chlorite (Chl)...Phengite (WM) Orthopyroxene Pyrophyllite QUartZ Stilpnomelane Talc (Tc) Dap Ctd cs Dsp Alm KY MS MAC FAC...phases with additional potassium, which are stilpnomelane and biotite. For corresponding endmembers, thermodynamic...According to Eggleton (1972), the ideal formula of stilpnomelane (Table 1) was given for a Fe2+ endmember fully...Tschermak’s substitution. The molar volume of the stilpnomelane endmember was estimated to be 3037 cm3 on the |  | | Journal (article/letter/editorial) | | 7S2S2, Paris Cedex, France 'BRGM SGN CEO, BP 6009, 45060 Orl6ans La Source, France 3Centre Armoricain...Ge'ologie, Universite de Rennes, 35042 Rennes Cedex, France A B S TR A C T In order to illustrate different...the hornblende parageneses are replaced by stilpnomelane parageneses quite early in the retrograde history...the area of the Vilaine River estuary, South Brittany, France (Triboulet & Audren, 1985a,b, 1988) Only one...GuernehuC area, Vilaine River estuary, South Brittany, France (Triboulet & Audren, 1985a, 1988). (a) Threedimensional |  | | Journal (issue) | | a diverse mineral assemblage that includes stilpnomelane, spessartine, riebeckite, crocidolite, quartz...metamorphic history, howieite, riebeckite, stilpnomelane and a more Mn-rich variety ofzussmanite replaced...Caledonia, by Ellenberger in 1958 from near Termignon, France, and by Coleman in 1959 at Cuzadero, California...Deerite is relatively common in the Alps of Italy and France; it is found in meta-ironstone in the Ambin massifand...elsewhere in the Cottian Alps, Northern Italy and France. In the Alpine terrain of Eastern Corsica, deerite |  | | Journal (article/letter/editorial) | | metamorphic rocks with ferroglaucophane + albite + stilpnomelane + muscovite +lawsonite _4:pumpetlyite are described...glaucophane and albite in varying: proportions. Stilpnomelane is present in all thes,: rocks, its volume not...44.0 3 i .5 46 0 3 ! .5 40.0 Pumpellyite Stilpnomelane White mica Hornblende Brown mica Chlorite Apatite...carefully handpicked mineral separate of sample 3. Stilpnomelane is always present and occurs in plates and stellate...chlorite partly replacing ferroglaucophane (and stilpnomelane) and green (presumably actinolitic) hornblende |  | | Journal (article/letter/editorial) | | Curie, 4 place Jussieu, 75252 Paris Cedex 05, France Abstract. A deerite-bearing rock occurs at the...1979); (A):Sifnos (Schliestedt, 1980); (W): Ile de Groix, (Kienast, 1983); (0):Shuksan Unit (Brown, 1974);...Quartz Blue amphibole Riebeckite Crossite Garnet Stilpnomelane Magnetite Hematite Aegirine Aegirine augite...1979; Caron er a/., 1981; this study). 12: Ile de Groix (Kienast. 1983). 13: Finney Creek (Brown, 1974)... and in a deerite-bearing rock from the Ile de Groix described by Kienast (1983). At Salbertrand (Agrell |  | | 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...oriented central biotite crystal of Fig. 1.13a,and stilpnomelane of Fig. 1.19a). For small elongate grains with...M inerals showing straight extinction. a) Stilpnomelane (note lower left E-W crystal and central N-S...glaucophane schist (blueschist); Ile de Groix, Brittany, France. x100 81 Intense prussian blue-indigo |  | | Journal (article/letter/editorial) | | au CNRS, 4, place Jussieu, 75252, Paris Cedex, France ABSTRACT The proposed geothermobarometer is based...internal zone of the Variscan orogenic belt at VendCe, France (ThiCblemont et al., 1987, 1988; ThiCblemont, 1988)...shortened because the amphiboles are replaced by stilpnomelane early in the retrograde history. The three A1"-Na...associts aux schistes bleus de I'lle de Groix, Bretagne mCmridionale, France. Schweize Mineralogie und Petrologie...varisque. Bulletin de la Socie'te' Ce'ologique de France, 8-111, 159-166. Thitblemont, D., Triboulet, C |  | | Journal (article/letter/editorial) | | several high-P terranes around the world (e.g. Île de Groix, 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 Île de Groix (Kiénast and Triboulet, 1972; Shelley and Bossière...retrograde minerals, such as chlorite, sericite, stilpnomelane, carbonates and sulfurs and sphene, in the C´...epidote blueschists from the Ile de Groix (Armorican Massif, France): a potential geobarometer. Journal |  | | Journal (article/letter/editorial) | | d'Histoire Naturelle, 61, rue Buffon, F-75005 Paris, France Offprint requests to: M. Guiraud ab alto ames...because there are no thermodynamic data for stilpnomelane; moreover addition of K to the system involves...cannot take into account minerals like phengite, stilpnomelane or iron oxides which are common in the blueschist...respect to stilpnomelane or biotite. However, it can be deduced from rocks that stilpnomelane appears only...Evidence for a Variscan suture zone in the Vendee, France: a petrological study of blueschist facies rocks |  | | Journal (article/letter/editorial) | | Rhode Island, U.S.A. Venasque, Pyrenees Mts., France St. Marcel, Piedmont, Italy Prost, 1883-4 Igelstrom...analyses of ottrelite from the Ardennes of Belgium and France (52-56, Table 6) showed varying and lesser amounts...1-44 007 0-24 404 1000 21. Venasque, Pyrenees, France. Manasse (1911, p. 41). This analysis and specific...quartz, and sericite. 34. Monte Fenouillet, Var, France. Manasse (1911). This analysis and specific gravity...The analysed chloritoid 61. Venasque, Pyrenees, France. Damour (1879). The analysed chloritoid was too |  | | Journal (article/letter/editorial) | | zoned amphibole, phengite, zoned epidote, stilpnomelane, chlorite, quartz, minor albite, magnetite,...white mica, garnet, epidote, chlorite, and stilpnomelane from glaucophane schist, garnet-epidote amphibolite... Irregular patches and seams of dark brown stilpnomelane are also present. Pyrite is enclosed by magnetite...with minor albite, chlorite, and traces of stilpnomelane and sphene, (2) The zoned amphiboles commonly...Meta-ironstone and chert with blue amphibole-garnet-stilpnomelane-quartz Downloaded from http://petrology.oxfordjournals |  | | Journal (article/letter/editorial) | | the glaucophane- and garnet-bearing rocks. Stilpnomelane may occur in all of these rocks. The sub- w...chloritoid; 12=localities of appearance of stilpnomelane; 13=localities of analyzed phengite; 14=tops...Range and also identified and mapped out the stilpnomelane schists. Further north, in the Rudawy Janowickie...CA calcian; Chl chlorite; Phe phengite; Stp stilpnomelane 3. T h e vicinity of N i e d a m i r 6 w w...%5 l0 of this kind a small a m o u n t of stilpnomelane (Table 4) is present as fine flakes. Magnetite |  | | Catalog/List | | Mine.Ravalli Co unty, Montana U.S.A Glomel. Brittany, France I x½ £2.50 l x2 6 0p variety YIRIDI NE (Mangan...x2 £3 2x2 £6 2x3 £ 10 Bo ulouris. St Raphael. France 2x2 £3 2x3 £5 3x4 £8 l x2 £8 2x2 £ 16 2x3...Les Ang)ais Mine, Masiac, lxl £1 Quartz Brouse, France Rich grey to yellowish, some fibrous. Rio Grande...Good green crusts on quartzite Cap Garonne, Var. France rich mass of smal l grey cylinders in matrix....2x3 £2.50 k m£3 2cm £6 Fonte Sant Mine, Var .France lx l £3 l."2 £5 2x2 £8 Weardale l x l £4 |  | | Journal (article/letter/editorial) | | albite + epidote + pumpellyite þ glaucophane ± stilpnomelane ± calcite + quartz. In the field, the ratio of...+ pumpellyite (Pmp-II; Fe-rich) ± biotite ± stilpnomelane ± calcite ± quartz as well as more actinolite...pumpellyites (Pmp), epidotes (Ep), lawsonite (Lws) and stilpnomelane (Stp). Sample SiO2 TiO2 Al2O3 FeOt MnO MgO...Omphacite Phengite Lawsonite Biotite Calcite Stilpnomelane Quartz indicating that part of the Fe is in...with minor Fe3+ substituting for Al (Table 1). Stilpnomelane occurs as a late-stage mineral in both the blueschists |  | v. Blanckenburg, F., Villa, I. M., Baur, H., Morteani, G., Steiger, R. H. (1989) Time calibration of a PT-path from the Western Tauern Window, Eastern Alps: the problem of closure temperatures. Contributions to Mineralogy and Petrology, 101 (1) 1-11 doi:10.1007/bf00387196 | Journal (article/letter/editorial) | | Alpine ages within the stability field of Alpine stilpnomelane, Central Alps Biotite Ar 410__50 Giletti...published recently from the blueschist facies Isle de Groix (Peucat 1986), namely phengite R b Sr > Phengite...index mineral stilpnomelane (J/iger et al. 1967). Since that study, the range for stilpnomelane appearance...Brown EH (1971) Phase relations of biotite and stilpnomelane in the greenschist facies. Contrib Mineral Petrol...and U-Pb dating of the blueschists of the Ile de Groix. Mere Geol Soc Am 164:229-238 Purdy JW, J/iger E |  | SPALLA, , CARMINATI, , CERIANI, , OLIVA, , BATTAGLIA, (2001) Influence of deformation partitioning and metamorphic re-equilibration on P-T path reconstruction in the pre-Alpine basement of central Southern Alps (Northern Italy) Journal of Metamorphic Geology, 17 (3) 319-336 doi:10.1046/j.1525-1314.1999.00199.x | Journal (article/letter/editorial) | | metamorphic imprint (chlorite, white mica and stilpnomelane) associated with the earlier Alpine fabrics...overlie the peak conditions estimated for the Île de Groix high-P/low-T Variscan belt, namely T =430– 530 °C...orogeny of the Alps. Memoires Societé Géologique de France, N.S. 156, 345–367. Powell, R. & Holland, T. J...glaucophanites et roches associées de l’Ile de Groix (Morbihan, France): étude minéralogique et pétrogénétique |  | | Book | | Geology in France and Related Areas (1994) J. D. Keppie (Ed.) Pre-Mesozoic Geology in France and Related...Cataloging-in-Publication Data. Pre-Mesozoic geology in France and related areas / J. D. Keppie (ed.). p.cm.Developed...2. Geology, Stratigraphic-Paleozoic. 3. Geology-France.!. Keppie, J. Duncan. II. IGCP Project 233-Terranes...comprehensive account of the PreMesozoic Geology of France (Armorican and Central Massifs) and related areas...the international copference held in Montpellier, France, in August, 1988, where a vast amount of new information |  | Kryza, R., Willner, A. P., Massonne, H.-J., Muszyński, A., Schertl, H.-P. (2011) Blueschist-facies metamorphism in the Kaczawa Mountains (Sudetes, SW Poland) of the Central-European Variscides: P-T constraints from a jadeite-bearing metatrachyte. Mineralogical Magazine, 75 (1) 241-263 doi:10.1180/minmag.2011.075.1.241 | Journal (article/letter/editorial) | | pumpellyite, Qz = quartz, Rt = rutile, St = stilpnomelane, Tt = titanite, V = H2O as hydrous fluid, Wm...(Tt) in the matrix; (b) pseudomorphs after stilpnomelane (St) filled with hematite, quartz and white mica;...0.5 mm. interpreted as pseudomorphs after stilpnomelane because similar aggregates were observed in...transitions between green stilpnomelane (enclosed in quartz), brown stilpnomelane and such aggregates are...for Fe2+and Fe3+-pumpellyite, Fe2+- and Mg-stilpnomelane, actinolite and magnesioriebeckite (Massonne |  | | Journal (article/letter/editorial) | | Eastern Alps (Selverstone et al. 1992), and Brittany, France (Barrientos and Selverstone, 1993; El Korh...metapelite, and ferruginous metasediments with stilpnomelane (Hervé, 1988; Hervé et al., 2007; Hyppolito...overprinting of epidote blueschist, Ile de Groix, France. Geology 21, 69–72. Baziotis, I., Mposkos, E...during subduction-related metamorphism, Ile de Groix, France: a detailed LA-ICP-MS study. Journal of Petrology...a result of fluid–rock interactions (Ile de Groix, France). Gondwana Research 23, 880–900. El-Shazly, |  | | Journal (article/letter/editorial) | | Université Rennes 1 & CNRS, 35042 Rennes cedex, France ABSTRACT The Malpica–Tui Unit (Galicia, NW Spain)...⁄ Ti-ox), hornblende (hb), sericite (ser), stilpnomelane (stp), sulphides (sul), tschermakite (ts), tourmaline...3a; Table 2). Minor proportions of sericite, stilpnomelane, carbonates and sulphides are commonly concentrated...epidote blueschists from the Ile de Groix (Armorican Massif, France): a potential geobarometer. Journal...blueschist-facies metapelites of the Ile de Groix, Armorican Massif, France. Journal of Petrology, 12, 485–510 |  | | Journal (article/letter/editorial) | | chloritoid has not been found stably coexisting with stilpnomelane, K-feldpar or albite, which is supported by...et al. (2002) Hirajima et al. (1988) Ile de Groix/France Spitsbergen 12–18/440–500 11 Okrusch et al...blueschist-facies metapelites of the Ile de Groix, Armorican Massif, France. Journal of Petrology, 43, 485–510 |
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