 | | Journal (article/letter/editorial) | | Leibniz University, Welfengarten 1 D-30167 Hannover, Germany Abstract The Central European Variscides and their...West Sudetes and its western prolongation the Fichtelgebirge-Erzgebirge Anticline which is well known for...2.1.4. The Subvariscan Foredeep 8 During the Upper Carboniferous, the Subvariscan Foredeep subsided...in the West, through the Ruhr District, Germany, to the Upper Silesian Coal Basin, Poland. The basin fill...calcareous platform sediments of the Malm series (Upper Jurassic) (Dill and Klosa, 2011). The Late Mesozoic |  | | Journal (article/letter/editorial) | | pyrargyrite, stephanite, polybasite in Obersachsen (Germany), Fresnillo in Zacatecas and acanthite appeared...Guanajuato (Mexico) and has become the richest silver mine in the world, in more recently Bou Azzer and Imiter...ceased vein. The San Juan production by the de Rayas mine in time of World War II. Guanajuato also In 1946...very city In Morocco, the of Oberschlema Bou Azzer mine, itself, which finally already very had to be relocated...and east of Schlema, 2014 Tucson show. The Imiter mine began its modern producing many quality specimens |  | Matthes, S., Okrusch, M., Schüssler, U., Richter, P., von Gehlen, K., Röhr, Ch. (1995) Talc-chlorite-amphibole felses of the KTB pilot hole, Oberpfalz, Bavaria: Protolith characteristics and phase relationships. Mineralogy and Petrology, 52 (1) 25-59 doi:10.1007/bf01163125 | Journal (article/letter/editorial) | | Printed in Austria Talc-chlorite-amphibole felses of the KTB pilot hole, Oberpfalz, Bavaria: protolith characteristics...KTB-Feldlabor, Windischeschenbach, Federal Republic of Germany With 13Figures Received August 7, 1992; accepted...in the KTB pilot hole contain intercalations of talc-chlorite-amphibole felses (or "h6sbachites"), which...cummingtonite ___tremolite/actinolite + clinochlore + talc + olivine + ilmenite ___Cr-bearing spinel + sulfides...to the formation of anthophyllite from olivine + talc at peak metamorphic temperatures of 640-700 °C, |  | | Journal (article/letter/editorial) | | at the western border of the Bohemian Massif (Germany} Received: 16 December 1991/Accepted: 7 April...complex late to post-Variscan crustal evolution. Upper Carboniferous (mainly Westphalian) granites were...Goethe-Universit/it, D-60325 Frankfurt a. M., Germany Key words Bohemian Massif structures - Palaeostress...Massif, in the northern part of the Oberpfalz (Germany). In this area three different pre-Permian tectonometamorphic...low-pressure/high-temperature (LP-- HT) stage of the upper amphibolite facies (Wagener-Lohse and B1/Jmel, 1984; |  | | Journal (article/letter/editorial) | | and vein-type barium mineralization in NE Bavaria, Germany Harald G. Dill a,∗ , Berthold Weber b , Reiner...D-30631 Hannover, Germany Bürgermeister-Knorr Str. 8, D-92637 Weiden i.d.OPf., Germany c University Kiel...Department, Olshausenstraße 40-60, D-24118 Kiel, Germany b a r t i c l e i n f o Article history: Received...Pegmatite Barium Phosphate Shear-zone NE Bavaria SE Germany a b s t r a c t Pegmatites and aplites enriched...lithological units of the NE Bavarian Basement, SE Germany. They are accompanied by Ba mineralization, in |  | | Journal (article/letter/editorial) | | D-44780 Bochum, Germany Abstract The breakdown reactions of antigorite: (1) forming talc + forsterite +...former experimental determinations by both Johannes [Johannes, W., 1975. Zur Synthese und thermischen StabilitPt...Beih. 53, 36.1 and Evans et al. [Evans, B.W., Johannes, W., Oterdoom, H., Trommsdorff, V., 1976. Stability...confirmed by equilibrium experiments on reaction (10) talc + forsterite w clinoenstatite + water, which is...analysis as well as thermodynamic calculations of the upper pressure-stability of antigorite show that the possible |  | | Journal (article/letter/editorial) | | applications to ultramafic rocks from the KTB pilot hole, Bavaria Received: 9 September 1996/Accepted: 4 December...assemblage calcic amphibole—orthoamphibole—chlorite—talc. In this study the phase relations of ultramafic...revealing that calcic amphibole—orthoamphibole—chlorite—talc assemblages cover a stability field of (650—770...of the calcic amphibole—orthoamphibole—chlorite—talc assemblage. At 580 °C the stability field extends...field of calcic amphibole—orthoamphibole—chlorite—talc extends from 10 to 11 kbar. E. Schmädicke ( ) |  | | Journal (article/letter/editorial) | | Mg3Si2Os(OH)4 + Mg(OH) 2 chrysotile brucite (1) (Johannes 1968) than the presence of serpentine ~.lone:...lone: 6Mg2SiO4 + Mg3Si40 lo(OH)2 + forsterite talc + 9H20 = 5Mg3Si2Os(O chrysotile (2) (Chernosky 1973)...higher temperature-pressure metamorphic event (upper greenschist or amphibolite facies) than is necessary...alteration or one or the other may predominate. The im- portant factors besides mineralogy and paragenesis...producing H2]** 2 serpentine 3 talc + magnesite [CO~ front producing 0~] talc + m agnesite country rock |  | | Book | | Gottfried-Wilhelm-Leibniz University Hannover, Germany Responsible Series Editor: F. Pirajno ISSN 1876-1682...much biased by science with too little sense of mine for beauty) will keep his memory and work, alive...rocks in the Bohemian Massif, which is shared by Germany, the Czech Republic, Poland and Austria, has been...the region are not very promising and mining in Germany is obviously a profession of the past, but learning...pegmatites. The geochemical atlas of the F.R. of Germany, albeit not covering all rare elements of relevance |  | | Journal (article/letter/editorial) | | may give rise to elevated B (Bea et al., 1994; Johannes et al., 1995). The data from these analyses were...present within the main phases (Bea et al., 1994; Johannes et al., 1995); it was in fact observed that quartz...barren. The Erzgebirge Stettner, 19791, the Fichtelgebirge Stettner, 1979) and the Hauzenberg migmatitic...dehydration reactions until it becomes unstable in the upper amphibolite facies (Werding and Schreyer, 1984;...silicate melts. Co&b. Miner. Petrol. 113, 492-501. Johannes, W., Holtz, F., MGller, P., 1995. REE distribution |  | | Journal (article/letter/editorial) | | Mineralogie, Ruhr-UniversitatBochum, D-44780 Bochum,Germany 2Centrede Recherchesur les M6canismesde la CroissanceCristalline...the structure may be seen as a nalrow module of talc otherwise separatinglarger domains of ideal serpentine...of ideal serpentine, Mg.SirO.(OHL, toward that of talc, Mg.SioO,o(OH)r,for the shortest modulation wavelengths...(Jasmundand Sylla 1972; lshi and Saito 1973), Johannes(1975) was first to syntheseantigorite in appreciable...Starting material was an oxide mixture or a mixture of talc and forsterite seededwith lVo natural Fe,Al-containing |  | | Journal (article/letter/editorial) | | rhythmically layered gabbro and quartz diorite in the upper section. There are three generations of shear zones...shear zones. Talc and magnesite were also mined from the State-line serpentinite. Talc occurs adjacent...adjacent to pegmatite dikes but both talc and magnesite formed in mylonite where magnesite also fills the matrix...metamorphic reactions within the active shear zones during talc and magnesite mineralization reflect fluid evolution...mineralogies and controlled the distribution of talc and magnesite deposition. Introduction The State-line |  | | Journal (article/letter/editorial) | | the gradients in aSiO2,aq and aCO2,aq set between talc–quartz–magnesite and serpentine–brucite equilibria...because the stability fields of brucite, serpentine and talc expand toward higher aCO2,aq and aSiO2,aq while...of quartz toward higher temperatures shifts the talc–quartz–magnesite equilibrium to very high aCO2,aq...followed by a zone of serpentine + carbonate, then talc + carbonate and finally quartz + carbonate. Our modeling...2003; Giammar et al., 2005; Hänchen et al., 2006; Johannes, 1967, 1969; Mckelvy et al., 2007; O'Connor et |  | | Journal (article/letter/editorial) | | Potsdam, Telegrafenberg, D-14473 Potsdam, FR Germany Institute of Earth Sciences, University of Potsdam...Potsdam, P.O. Box 601553, D-14415 Potsdam, FR Germany 3 Rooseveltlaan 964, NL-3526 BP Utrecht, The Netherlands...separated locations in the Ødegårdens Verk apatite mine, Bamble Sector, SE Norway, which was partially metasomatized...the phlogopite has been altered to aggregates of talc and chlorite as well as being overgrown by hornblende...1875). Orthopyroxene, commonly pseudomorphed by talc and minor rutile, occurs dispersed throughout the |  | | Journal (article/letter/editorial) | | and Mg-rich rim from the Erbendorf peridotite in Bavaria (Matthes and Knauer, 1981). Representative patterns...described from chlorite-talc-tremolite-olivine rock of the Erbendorf peridotite body, Germany (Mat thes and Knauer...+tremolite+9 water (1) and 5 antigorite = 6 forsterite+talc +9 water It is noted olivine same that formed...uniform composition of olivines in peridotites of upper mantle origin or cumulus origin (cf. Simkin and...consumption of magnetite on olivine com position. Talc and Ni-sulfide may play a similar role as magnetite |  | | Journal (article/letter/editorial) | | and magnesite with variable amounts of olivine, talc, serpentine, chlorite, and phlogopite and include...maucherite. Related rocks comprise olivine-magnesite-, talc-magnesite-, and olivine-orthopyroxene (saxonite)-assemblages...equilibria. The gas-deficient assemblage enstatite+talc+forsterite+magnesite is presumed to be stable at...Ruhr-Universitdt Bochum, Postfach 2148, D-463 Bochum, W. Germany 304 W. OHNMACHT—PETROGENESIS OF PETROGRAPHY...T olivine orthopyroxene phyllosilicates quartz talc Carbonate-orthopyroxenites Orthopyroxene and magnesite |  | | Journal (article/letter/editorial) | | types of alteration, namely, serpentinizationand talc-carbonatealteration. An analysis of nickeliferousopaquemineral...Ultramafic body •-• Completely serpentinized •\\•\?\• Talc carbonate alteration Zones ofdisseminated magmatic...of the body. ! Finally,'thereis a marginalzoneof talc-carbonate ! alteration present locally. This zonal...assemblages Nonopaque mineral assemblages Locality Talc-carbonate Reference facies hm ank-mgs Bert's...Cove-Tilt (ml-py) ' 'silica-carbonate" Eastern Metals mine, Quebec Pollack, Scoares, 1969, p. 93-94 Cove |  | | Journal (article/letter/editorial) | | sollten infolge der kurzen Verweilzeit dieser Elemente im Meerwasser wesentlich niedrigere REE-Gehalte und...vermutlich tiefliegenden Sepentiniren, auf die es Hinweise im Untergrund der oststeirischen Gneisskomplexe und...times of these elements in seawater. Analyses of talc pseduomorphs after magnesite indicate as well that...dolomite qui se pr&entent en masses altern6es dans la mine de magn&ite de Oberdorf/Laming (Steiermark, Autriche)...Des analyses de pseudomorphoses de magn~site en talc montrent de mfime que la distribution des terres |  | | Journal (article/letter/editorial) | | Garnet (up to 25 cm in size), phengite, kyanite, talc and rutile are in textural equilibrium in an undeformed...coexistence of nearly pure pyrope with free silica and talc, ii) the coexistence of jadeite with kyanite, iii)...Water activity must have been low. The stability of talc-phengite and the presence of rare glaucophane inclusions...nevertheless persist to considerable depths. Moreover, the upper crustal (evaporite-related?) origin of the quartzite...suggested that coesite is a stable phase in the upper mantle provided free silica exists there. Indeed |  | | Journal (article/letter/editorial) | | among antigorite, diopside, tremolite, forsterite, talc, calcite, dolomite and magnesite in progressively...partially overlapping fields in the T-Xco2 diagram. The upper temperature limit of ophicalcite rocks lies below...ophicalcite, ophidolomite, and ophirnagnesite rocks. Talc-carbonate rocks are often closely associated. The...metamorphism of siliceous dolomites and limestones, namely talc, tremolite, diopside, forsterite, calcite, and dolomite...where serpentine is stable, the H20-rich side (Johannes, 1969), has received comparatively little attention |  | | Journal (article/letter/editorial) | | deposits: Die gr6fken bergbaulichen Reserven iiegen im Veitsch Typ The world's largest reserves are found...to this trend it is here concluded by integrating Im Gegensatz zu diesem Trend wird hier auf Grund einer...A genetic model is presented, which st~itten eine im wesentlichen syngenetische Entswhung der stresses...clastic dinarily magnesite, dolomite, silicates (talc, chlorite, rocks, as at Veitsch/Austria, where nonmagnesitic...footwalls of veins are often slickensides with thin talc or serpentine bands, while hanging walls may be |  | | Journal (article/letter/editorial) | | Economic Geology, Johannes-Gutenberg-University Mainz, D-55099 Mainz, Becherweg 21, Germany a r t i c l e.... . . . . . . . . . . . . . . . . . . . 51.2.2. Talc-pyrophyllite . . . . . . . . . . . . . . . . . .... . . . . . . . . . . . . . . . . . . . 51.3.2. Talc-pyrophyllite . . . . . . . . . . . . . . . . . .... . . . . . . . . . . . . . . . . . . . 51.4.3. Talc. . . . . . . . . . . . . . . . . . . . . . . . ...atmosphere, hydrosphere and lithosphere (crust and the upper mantle). There are physical barriers hampering our | | | Journal (article/letter/editorial) | | Economic Geology, Johannes-Gutenberg-University Mainz, D-55099 Mainz, Becherweg 21, Germany a r t i c l e.... . . . . . . . . . . . . . . . . . . . 51.2.2. Talc-pyrophyllite . . . . . . . . . . . . . . . . . .... . . . . . . . . . . . . . . . . . . . 51.3.2. Talc-pyrophyllite . . . . . . . . . . . . . . . . . .... . . . . . . . . . . . . . . . . . . . 51.4.3. Talc. . . . . . . . . . . . . . . . . . . . . . . . ...atmosphere, hydrosphere and lithosphere (crust and the upper mantle). There are physical barriers hampering our |  | | Book | | Justus-Liebig-Universität Senckenbergstrasse 3 35390 Giessen Germany K. WEBER Institut für Geologie und Dynamik der...Göttingen Goldschmidtstrasse 3 37077 Göttingen Germany Cataloging-in-Publication D a t a applied for...international conference in G6ttingen/Giessen, Germany. Discussions were focused on the Tectonothermal...Geological Survey of Hessen Leberberg 9 65193 Wiesbaden Germany V. BACHTADSE Institut fur Allgemeine und Angewandte...Ludwig-Maximilians-U niversitat Theresienstr. 41 80333 Munchen Germany M. BANAS University of Mining and Metallurgy AI |  | | Journal (article/letter/editorial) | | Figure 1. Elongate olivine in postkinematic talc-olivine replacement vein, Alpe di Mea, Valle Mesolcina...p h i c ultramafic rocks showing the assemblage talc + olivine, there is a tendency for olivine to be...in the state of Washington, numerous examples of talc-olivine rocks have been encountered in which olivine...hornfels facies metaperidotites showing the assemblage talc + olivine, commonly accompanied by magnesite, that...olivine in talc-olivine schists tends to be granoblastic, albeit commonly quite coarse grained. Talc-olivine |
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