| Moine, Bernard, Fortune, Jean Pol, Moreau, Philippe, Viguier, Francis (1989) Comparative mineralogy, geochemistry, and conditions of formation of two metasomatic talc and chlorite deposits; Trimouns (Pyrenees, France) and Rabenwald (Eastern Alps, Austria) Economic Geology, 84 (5) 1398-1416 doi:10.2113/gsecongeo.84.5.1398 | Journal (article/letter/editorial) | Deposits:Trimouns (Pyrenees,France) and Rabenwald(EasternAlps, Austria) BERNARDMOINE, JEAN POL FORTUNE, Laboratoirede...F.31000 Toulouse,France PHILIPPE MOREAU, S. A. Talc de Luzenac, 2 Place Edouard Bouilli3res, F.31000...Trimouns(FrenchPyrenees)andRabenwald(AustrianAlps)talc andchloritedeposits occurwithin Paleozoicmetamo...tectonicslicing)of late Hercynian(Trimouns)andAlpine(Rabenwald) age.The studyof the mineralassemblages andthe...8 to 9 kbars at Rabenwald, where the talc- phengiteassemblage is characteristic. Talc-richoresoriginatefrom | | Chen, Yi-Xiang, DemĂ©ny, Attila, Schertl, Hans-Peter, Zheng, Yong-Fei, Huang, Fang, Zhou, Kun, Jin, Qi-Zhen, Xia, Xiao-Ping (2020) Tracing subduction zone fluids with distinct Mg isotope compositions: Insights from high-pressure metasomatic rocks (leucophyllites) from the Eastern Alps. Geochimica et Cosmochimica Acta, 271. 154-178 doi:10.1016/j.gca.2019.12.025 | Journal (article/letter/editorial) | leucophyllites, mainly composed of quartz, muscovite/phengite and Mg-chlorite, occur in several localities in...leucophyllite formation. Two leucophyllites in Austria exhibit higher ï€26Mg values of 0.05 to 0.09â° compared...ï€26Mg (>0.3â°) fluid derived from dehydration of talc-rich serpentinite. This is for the first time to...1a; Koller and Pahr, 1980; DemĂ©ny et al., 1997). Talc and ophicarbonate (limestone, Mg-calcite and dolomite)...deformation the feldspars are altered to fine-grained phengite aggregates while garnet disappears. Along the | | | Journal (article/letter/editorial) | Geologische Bundesanstalt, PO Box 154, A-1031 Wien, Austria ing, although ponded metamorphic ÂŻuids and mantle...the main orogenic phases (Erzberg, Mitterberg, Rabenwald) or which were considered to be late to post-tectonic...Fe-carbonates) Cu (quartz, carbonates) siderite (ankerite) talc (dolomite) Veins Veins Veins Replacement masses...Austroalpine: Kleinkogela Rabenwalda Baryte (quartz) Talc Veins Shear zone a Deposits investigated in more...the localities represent active mines (Erzberg, Rabenwald, Waldenstein), while others are either exhausted | | | Journal (article/letter/editorial) | of these rocks and mineral separates of pyrope, phengite, and monazite from âpyrope quartziteâ were analyzed...patterns of all granitic country-rock gneiss, phengite schist- and garnetjadeite-quartz-layer intercalations...enrichment of all, especially light, REEs, whereas in phengite only the light REEs (LREEs) La, Ce, and Nd were...(1973, 1974) for a rock type characterized by a talc ĂŸ kyanite-bearing mineral assemblage, is also quite...finding of pyrope, kyanite, high-Si- and high-XMg-phengite and quartz/coesite inclusions within zircon of | | | Journal (article/letter/editorial) | geochemical data for ââpyrope quartziteââ, various phengite-schist and jadeite-bearing rock intercalations...protoliths. Trace-element contents of the different phengite schists included in the ââpyrope quartziteââ conïŹrm... this rock should, in fact, be named a quartzâphengiteâpyropeâkyanite/(coesite) rock. However, for reasons...introduced and deïŹned by Schreyer (1973, 1974) as a talc + kyanite-bearing rock type rich in Mg and Al, but...al., 1997). Pawlig & Baumgartner (2001) studied a talcâkyaniteâchloritoid whiteschist from the Monte Rosa | | | Journal (article/letter/editorial) | have been formed. By deÂźnition, whiteschists are talc-kyanite rocks (Schreyer 1973, 1974), although this...is a pyrope-coesite rock produced by the reaction talc + kyanite = pyrope + coesite + H2O (Schertl et al...deformation the feldspars are altered to Âźne-grained phengite aggregates and garnet disappears. A general succession...reduced at the expense of increasing amounts of phengite. The leucophyllite, deÂźned by the appearance of...successions have been described in the Rabenwald (Austria) talc-chlorite deposit (Moine et al. 1989). | | | Journal (article/letter/editorial) | characterized by the mineral assemblage kyanite ? talc (?-quartz or coesite). We demonstrate that whiteschist...feldspar, or omphacite are formed instead of kyanite or talc. Furthermore, the stability field of the whiteschist...the characteristic mineral assemblage kyanite ? talc, which had undergone highpressure metamorphism (i...Petrol protoliths have been suggested for kyanite-talc-bearing rocks, including metapelites, acid volcanics...becomes evident that rocks with the mineral assemblage talc ? kyanite characteristically form at elevated pressures | | Tian, Ye, Xiao, Yilin, Chen, Yi-Xiang, Sun, He, Liu, Haiyang, Tong, Fengtai, Yang, Jie-Hua, Schertl, Hans-Peter (2019) Serpentinite-derived low ÎŽ7Li fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps. Lithos, 348. 105177 doi:10.1016/j.lithos.2019.105177 | Journal (article/letter/editorial) | samples near the eastern end of the Eastern Alps in Austria. The Mg-rich rocks from the two localities represent...composed of quartz/coesite, pyrope, kyanite, phengite and talc, occur as lenses in RI PT thickness of a...mainly include pyrope, quartz/coesite, kyanite, phengite, talc and jadeite, while in the retrogressed samples...samples, pyrope has been replaced by talc and chlorite (Schertl and Schreyer, 2008). Further samples of...come from the eastern end of the Eastern Alps in Austria described by Schertl and 7 ACCEPTED MANUSCRIPT | | Tropper, P., Harlov, D., Krenn, E., Finger, F., Rhede, D., Bernhard, F. (2007) Zr-bearing minerals as indicators for the polymetamorphic evolution of the eastern, lower Austroalpine nappes (Stubenberg Granite contact aureole, Styria, Eastern Alps, Austria) Lithos, 95 (1) 72-86 doi:10.1016/j.lithos.2006.07.008 | Journal (article/letter/editorial) | (Stubenberg Granite contact aureole, Styria, Eastern Alps, Austria) P. Tropper a,â, D. Harlov b , E. Krenn...University of Innsbruck, Innrain 52, A-6020 Innsbruck, Austria b GeoForschungsZentrum Potsdam, Telegrafenberg...Hellbrunnerstrasse 34, A-5020 Salzburg, Austria d Fasangasse 11, A-8073 Feldkirchen, Austria Received 23 November 2005;...the Eastern Alps, near the village of Stubenberg, Styria (Fig. 1). Tectonically, it belongs to the Lower...gneisses (Schuster, pers. comm.), the talc mining site Rabenwald (Moine et al., 1989), the Sopron area | | | Journal (article/letter/editorial) | extending from Belgium, in the West, through the Ruhr District, Germany, to the Upper Silesian Coal Basin, Poland...layer-type (e.g. serpentine), 2:1 layer-type (e.g. talc), 2:1:1 (2:2) layertype (e.g. chlorite) and 2:1...deposits: (1) Serpentine-kaolinite/kandite group, (2) Talc- pyrophyllite group, (3) smectite group, (4) mica...heat source at temperatures between 600°C and 500°C talc, actinolite, anthophyllite and carbonates developed...2012). 4.2 Talc-pyrophyllite group 4.2.1 Talc subgroup Similar to the serpentine s.s.s, talc [Mg3Si4O10(OH)2] | | Chen, Yi-Xiang, Schertl, Hans-Peter, Zheng, Yong-Fei, Huang, Fang, Zhou, Kun, Gong, Ying-Zeng (2016) MgâO isotopes trace the origin of Mg-rich fluids in the deeply subducted continental crust of Western Alps. Earth and Planetary Science Letters, 456. 157-167 doi:10.1016/j.epsl.2016.09.010 | Journal (article/letter/editorial) | the breakdown of Mg-rich hydrous minerals such as talc and antigorite in serpentinite at the slabâmantle...complex is mainly composed of kyaniteâalmandineâ phengite paraschist with interlayers of marble and eclogite...marked by a few decimeters to several meters of phengite-rich rocks (Schertl and Schreyer, 2008). Inside...Inside the whiteschist blocks, there are phengite schist and jadeiteâ kyanite quartzite layers (Schertl and...include quartz/coesite, pyrope, kyanite, phengite and talc. The size of pyrope crystals is highly variable | | | Journal (article/letter/editorial) | a Regional Metamorphic Terrain (Tauern Window, Austria): Parageneses and Crystal Chemistry G. Franz, G...similar metamorphic grade from the Tauem Window, Austria, were analyzed by electron microprobe. The results...K-feldspar, biotite, muscovite, margarite, chlorite, talc, amphibole, epidote, garnet, phenakite, calcite...order beryl m talc > actinolite > biotite ~--chlorite > phengite (Habachtal) beryl > phengite > biotite >...> garnet (Schrammacher) phengite > beryl > biotite (Felbertal). Textural relations show that the beryls | | Ertl, A., Marschall, H. R., Giester, G., Henry, D. J., Schertl, H.-P., Ntaflos, T., Luvizotto, G. L., Nasdala, L., Tillmanns, E. (2010) Metamorphic ultrahigh-pressure tourmaline: Structure, chemistry, and correlations to P-T conditions. American Mineralogist, 95 (1) 1-10 doi:10.2138/am.2010.3283 | Journal (article/letter/editorial) | UniversitĂ€t Wien, Althanstrasse 14, 1090 Wien, Austria Department of Earth Sciences, Wills Memorial Building...UniversitĂ€t Wien, Althanstrasse 14, A-1090 Wien, Austria 6 Institut fĂŒr Geowissenschaften, UniversitĂ€t Heidelberg...the host pyrope formed as a result of the reaction talc + kyanite = pyrope + coesite (second pyrope-forming...first pyrope forming reaction chlorite + kyanite + talc = pyrope; Schertl et al. 1991) as suggested by Schreyer...The sample is a metasedimentary piemontite- and talc-bearing garnetphengite-coesite-schist; P-T conditions | | | Journal (article/letter/editorial) | exchange. Port Vieux (Grant et al., 1990), Trimouns talc quarry (Moine et al., 1989; Boulvais et al., 2006)...325 25 Malasoma and Marroni (2007) Chlorite-phengite thermobarometry Schroyen and Muchez (2000) Fluid...Neouvielle massif Ne02 Col dâEstaragne Ne04 Trimouns talc quarry Tri04 Mg-chlorite from Ore deposit Tri07...and Table 2. Except for samples from the Trimouns talc deposit (Fig. 2C) and Navette area Chl-thermometry...and phengite. Oxygen isotope composition of phengite and garnet give a garnetâquartz and phengiteâquartz | | | Journal (article/letter/editorial) | (HP) metapelitic rocks. In addition to quartz, phengite, paragonite and rutile, the micaschists display...chloritoid + chlorite and garnet + chloritoid + kyanite. Talc has never been observed. Garnet and chloritoid are...(1979) towards higher pressures and adds the phase talc. Observed parageneses in HP metapelites are consistent...lawsonite paragonite quartz sillimanite staurolite talc zoisite INTRODUCTION The garnet-chloritoid-chlorite...phases, including chlorite, kyanite, paragonite, talc, glaucophane and a zinc-rich staurolite (Leupolt | | | Journal (article/letter/editorial) | 3.5 phengite-3T from the same whiteschist contains nano- to microscale quartz platelets and talc layers...Assuming equilibrium between garnet, pyroxene, and phengite, all present as inclusions within the same zircon...from the TEM study of phengite crystals in the matrix. Exsolution in UHP phengite? High-resolution transmission...electron micros copy (HRTEM) of the S i 3 . 5 5 phengite-3T in the pyrope whiteschist revealed the existence...sequences of 18.9 A periodicity, interpreted as talc-2M on the basis of analytical microscopy. T h e | | | Journal (article/letter/editorial) | (after coesite) (~180 = 8.1 to 8.6%0, n = 6), phengite (6.2 to 6.4%o, n = 3), kyanite (6.1%o, n = 2)...by the temperature-sensitive dehydration reaction talc + kyanite = pyrope + coesite + H20, the a(H20) must...were made on primary talc and phengite (SD~s~ow~ = - 2 7 to -32%o), on secondary talc and chlorite after...and on the surrounding biotite (SD = -64%o) and phengite (SD = -44%0) gneiss. All phases appear to be in...4809-1063, USA Correspondence to: Z.D. Sharp retrograde talc + chlorite after pyrope may be fluids evolved locally | | | Journal (article/letter/editorial) | Eastern Alps, Austria: Thermobarometry of the assemblage garnet + omphacite + phengite + kyanite + quartz...University of Innsbruck, Innrain 52, A 6020 Innsbruck, Austria Received 28 October 2005; accepted 24 March 2006...five kyanite eclogites from the Tauern Window, Austria, are evaluated on the basis of recent calibrations...calibrations of the assemblage garnet + omphacite + phengite + kyanite + quartz. Results are about 25 kbar, 630...evident from the Tauern samples. The presence of talc is consistent with these PâT values and high H2O | | Glodny, Johannes, Ring, Uwe, KĂŒhn, Alexander, Gleissner, Philipp, Franz, Gerhard (2005) Crystallization and very rapid exhumation of the youngest Alpine eclogites (Tauern Window, Eastern Alps) from Rb/Sr mineral assemblage analysis. Contributions to Mineralogy and Petrology, 149 (6) 699-712 doi:10.1007/s00410-005-0676-5 | Journal (article/letter/editorial) | eclogite geochronology is almost unexploited. Phengite Rb/Sr data were used, in combination with whole...surrounding it. Thus, the geochronologic meaning of phengite-based two-point isochrons often remains obscure...Eclogite facies mobilisate with cm-sized kyanite and phengite crystals, in a matrix of ïŹne-grained eclogite...consist of up to cm-sized quartz, kyanite, and phengite crystals, with rutile and minor garnet and omphacite...composition data for garnet, omphacite, and white mica (phengite, paragonite) are presented in Table 1 and plotted | | | Journal (article/letter/editorial) | minerals, particularly garnet but also phengite, omphacite and talc. from eclogites and surrounding schists...coexisting fen'omagnesian phases (clinopyroxene, phengite and talc in different assemblages) decreases from core...from eclogites, a talc+ garnet+kyanite 4-quartz schist and garnet + mica (phengite) schists, has been...Electron microprobe profiles across garnet in the talc+garnet+kyanite+quartz schist. garnet and is a)so...rim (Fig. 6a). In contrast to clinopyroxene, the phengite in the eclogite is clearly zoned, with Mineral | | | Journal (article/letter/editorial) | Talc-Phengite: a Widespread Assemblage in HighGrade Pelitic Blueschists of the Western Alps by CHRISTIAN...{Received 25 March 1981; in revisedform 25 May 1981) Talc-phengitc, an assemblage hitherto believed to be...characteristic mineral association chloritoidtalc-phengite (Si3.4_3.j). Talc contains up to 15 mole per cent minnesotaite...mole per cent of the magnesium end member. The talc-phengite stability results basically from the disappearance...Fe-Mg-chlorite + quartz -»talc + garnet + H2O .and Fe-Mg-chlorite + quartz -»talc + chloritoid + H2O. These | | Mueller, Andreas G., McNaughton, Neal J., Muhling, Janet R. (2021) Albite ± Actinolite-Altered Porphyry Dykes in Archean Gold Deposits of the Boulder Lefroy-Golden Mile Fault System, Yilgarn Craton, Western Australia: Petrography, Chronology, and Comparison to Canadian Albitites. Minerals, 11 (11) 1288 doi:10.3390/min11111288 | Journal (article/letter/editorial) | post-kinematic actinolite-pyrite selvages overprinting talc-chlorite-phlogopite-dolomite schist. It contains...(chl-cal-bt) and talc-dolomite-phlogopite schist (modified from biotite (chl-cal-bt) and talc-dolomite-phlogopite...talc-dolomite-phlogopite (talc-dol-phl)(talc-dol-phl) schist (modified from [14]). Surface [14]). Surface samples 59070...andlink a biotite contact zone (Bt) from talc-dolomite talc-dolomite schist. chlorite-calcite Flat quartz...production to 20.3 Mt at 2.17 g/t (1986â2009). District-scale mapping [15] established that the deposit | | | Journal (article/letter/editorial) | reactions relating chloritoid-staurolite--chlorite--talc--kyanite--garnet together with amphibole, pyroxene...stable part of the parageneses (e.g., paragonite, phengite, Naamphibole, lawsonite and epidote; see below)...highpressure metamorphic terrains in the Tauern Window, Austria (Miller, 1974, 1977; Holland, 1979a, b), New Caledonia...staurolite, chloritoid, biotite, chlorite, sometimes talc, b u t apparently not cordierite. Of the various...P --T stability fields for chlorite, garnet and talc coexisting with quartz and muscovite are shown together | | | Report (chapter) | Massif the association of pyrope, kyanite, talc, phengite and quartz with coesite relics within pyrope...temperatures as high as 700-750~ (Chopin 1984). Phengite lying in a foliation younger than the garnet yielded...at temperatures of 400-500~ The oldest Alpine phengite ages are 110 Ma; again cooling ages are down to...Ages of 100 and 110 Ma have been obtained for the phengite (Wetzel 1972, Hunziker 1974, Chopin & Moni6 1984...the Eoalpine high-pressure phengite 3T polytype into a lower-pressure phengite 2M polytype. In places the | | | Journal (article/letter/editorial) | assemblage in the sodic metapelites is quartz + phengite + jadeite + glaucophane + chloritoid + lawsonite...and the overlying metabasite-metachert sequence. Phengite RbâSr and ArâAr data from the blueschists indicate...quartz-rich greyschists at the base, and white, phengite-rich schists at the top below the marbles (Lisenbee...smaller grain aggregates. White mica, predominantly phengite, forms aggregates of slender crystals deïŹning...samples contained paragonite closely associated with phengite, similar to the textures described by Shau et |
|