 | | Journal (article/letter/editorial) | | garnet- and spinel-bearing high-temperature peridotite bodies in the southern Bohemian massif (lower Austria)...Re^Os systematics of orogenic peridotites from lower Austria (Bohemian massif) were studied. The trace element...background In the southern Bohemian massif (lower Austria and Czech Republic) peridotite massifs occur...were obtained for garnet-bearing massifs from lower Austria [14,20]. Pyroxenite layers (garnet pyroxenite...massifs represent fragments of upper Devonian or lower Carboniferous (350^400 Ma) supra-subduction zone |  | | Journal (article/letter/editorial) | | Geochemistry of garnet peridotite massifs from lower Austria and the composition of deep lithosphere beneath...garnet lherzolites, spine1 and spinel-garnet harzburgites from lower Austria show major and trace element...element composition of the peridotites from lower Austria is more depleted than the average of continental...peridotit:; Ultramatic massif; Geochemistry; Lower Austria; Subduction 1. Introduction 1 Now at Department...presented on garnet-bearing peridotite massifs from lower Austria (southern Bohemian massif) which once equilibrated |  | | Journal (article/letter/editorial) | | peraluminous granulites from the Gföhl Nappe System, Austria Konstantin Petrakakis1 , Nathalie Schuster-Bourgin2...Vienna, Vienna, Austria of Lithospheric Research, University of Vienna, Vienna, Austria Correspondence:...tectono-metamorphic evolution of the Gföhl Nappe System, Austria. They contain the primary assemblage garnet + Al-rich...sapphirine + spinel + plagioclase formed around kyanite inclusions, (b) orthopyroxene + spinel + plagioclase...their rims and (c) clinopyroxene + orthopyroxene + spinel + plagioclase ± hornblende formed within cracks |  | | Journal (article/letter/editorial) | | Pfalz, alkali feldspar, 489. Dreiser Weiher, Eifel, spinel-lherzolite xcnoliths, 736. Harzgerode, Harz, ulhnannite...Berkshire; Ha#on attd Shabbington Wood, Buckinghamshire; Lower Froyle, Selt)orne, and West Worldham, tlampshire;...alkali feldspar, 489. France Le Puy, IIaute-Loire, spinel-lherzolite xenoliths, 726. Lherz, Aridge, omphacite...omphacite, 61. Montboissier, Pto,-de-DOme, spinel-lherzolite xenoliths, 726. Montebras, Creuse, amblygonite...Beaunit, Puy-de-D6me, spinel-lherzolite xcnoliths, 726. Rentikres, Pu.v-de-DOme, spinel-lherzolite xcnoliths |  | | Journal (article/letter/editorial) | | from a Paleozoic convergent plate $ margin (lower Austria) Harry Becker a,b,*, Richard W. Carlson a, Steven...massifs from a Paleozoic convergent plate margin (lower Austria) is slightly suprachondritic to highly radiogenic...background In the southern Bohemian massif (lower Austria and Czech Republic), peridotite massifs occur...were obtained for garnet-bearing massifs from lower Austria (Carswell, 1991; Becker, 1997a), whereas pyroxenite...layers (garnet clinopyroxenite, garnet websterite, spinel orthopyroxenite, garnetite) and megacrysts enclosed |  | | Journal (article/letter/editorial) | | producing one-sided, asymmetric profiles with XMg lower against biotite. As a consequence, rim compositions...containing higher Ca than the first-formed garnet but at lower XMg. Use of such garnet compositions for geothermobarometrical...bodies, like their counterparts in neighbouring Lower Austria, belong to the tectonically uppermost part of...(plagioclase XA, -- 0.35--0.40 and K-feldspar) texture. Spinel (XMg= 0.36) is found in the core of plagioclase...is clearly replacing (Fig. 2). The presence of spinel (and corundum will be discussed in more detail |  | | Journal (article/letter/editorial) | | orthopyroxene–plagioclase–spinel in garnet; plagioclase– sapphirine, plagioclase–corundum and plagioclase–spinel in kyanite;...microfaults. Releasing bends filled with amphibole and spinel form along microfaults in garnet. The faulting...Kayal et al., 1993) are evidence that the present lower crust may fracture. Pseudotachylyte formed at granulite...facies assemblage: orthopyroxene, anorthite and spinel (Fig. 3b). Some fractures have a zonal distribution...part consisting of intergrown orthopyroxene and spinel and an outer part consisting of anorthite and orthopyroxene |  | | Journal (article/letter/editorial) | | minerals (e.g. orthopyroxene, augite, plagioclase and spinel). Most garnet grains are <3 mm in diameter, but...and/or hematite) associated with Fe–Mg aluminous spinel [Mg/(Fe + Mg) ¼ 0.62–0.63] in places, but also...between omphacite and garnet. (b) Symplectite of spinel (Spl) + plagioclase (Pl) develops around kyanite...pervasively replaced by very fine-grained Fe–Mg aluminous spinel [Mg/ (Fe + Mg) ¼ 0.60–0.62] + Ca-rich plagioclase...92] symplectites (Fig. 3b). Such development of spinel + plagioclase symplectites is relatively common |  | | Journal (article/letter/editorial) | | high-temperature peridotite massifs in lower INTRODUCTION Austria were exhumed during Carboniferous plate...in KEY WORD& garnet pyroxtmUs; geochemistry; lower Austria; ultrathe parent melt (Pearson et al., 1993)...Pyroxenites from Garnet Peridotite Massifs from Lower Austria JOURNAL OF PETROLOGY VOLUME 37 AUGUST 1996...1992). The peridotites are garnet lherzolites and spinel- and Znojmo Ductile high-temperature shear zones...belt of central Europe, (b) Geological map of the lower Auitrian and Czech part of the toutheastern Bohemian |  | | Journal (article/letter/editorial) | | Zone in Lower Austria and W Moravia present evidence for introduction of segments of the Lower Palaeozoic...peridotite massifs in the Moldanubian Zone of Lower Austria (Becker, 1996). Besides, some metasedimentary...lenses or boudins of serpentinized spinel peridotite, two-pyroxene spinel pyroxenite and less abundant boudins...normalized REE pattern. Although the rock shows a lower-pressure overprinting, fine-grained garnet has highly...from Dunkelsteiner Wald granulite, Gföhl unit, Lower Austria (Becker & Altherr, 1992) are also shown. Rock |  | | Journal (article/letter/editorial) | | replaced by a symplectite of plagioclase, corundum, spinel and sapphirine. The sapphirine is amongst the most...eclogite is often replaced by a plagioclase" corundumq spinel " sapphirine symplectite Že.g., Matthes et al....symplectite (S2 in Fig. 1a,b): Spinel has a composition intermediate between spinel ŽMgAl 2 O4 . and hercynite...ratio equal to 0.49 ŽTable 1.. As for corundum, spinel vermicules are disposed radially and perpendicular...irregular strip at the rim of the kyanite pseudomorph. Spinel also occurs in this outer zone. Plagioclase is |  | | Journal (article/letter/editorial) | | ASSOCIATED PYRICLASITES, BOHEMIAN MASSIF OF LOWER AUSTRIA, AUSTRIA Heinz G. SCHARBERT Mineralogisch-Petrographisehes...ehes Institut der Universitat, A 1010 Vienna (Austria) Received 24 May 1973 Revised version received...been metamorphosed under the conditions of the lower cru st, lumps and fragments of the upper mantle...looses efficiency in comparison to garnets from lower metamorphic rocks [3]. Granulite facies complexes...granulite facies complexes needed conditions of the lower crust. F r o m the deep-reaching tectonic movements |  | | Journal (article/letter/editorial) | | symplectitic intergrowths with plagioclase±corundum±spinel after kyanite. Kyanite and omphacite were the main...eclogitization at 969±14 Ma (Johansson et al., 1998). The lower age limit for the peak metamorphism and the deformation...conspicious tectonic and metamorphic break to overlying lower-grade amphibolite facies rocks in the Western Segment...(Johansson & Möller, 1986), the Moldanubian Zone in Austria (Carswell et al., 1989), the Central Gneiss Belt...intergrowths of sapphirine, plagioclase, corundum and spinel (Fig. 3a–d). Kyanite locally contains some Cr O |  | Kröner, A., O'Brien, P. J., Nemchin, A. A., Pidgeon, R. T. (2000) Zircon ages for high pressure granulites from South Bohemia, Czech Republic, and their connection to Carboniferous high temperature processes. Contributions to Mineralogy and Petrology, 138 (2) 127-142 doi:10.1007/s004100050013 | Journal (article/letter/editorial) | | clinopyroxene. A further high temperature overprint at lower pressure (ca. 4 kbar) is re¯ected in the development...prevalent. These conditions can be those of a stable lower crustal geotherm or, alternatively, those attained...information pertaining to conditions and processes in the lower continental crust. The most voluminous of the scattered...bodies, like their counterparts in neighbouring Lower Austria, comprise part of the GfoÈhl Unit, the tectonically...is compositionally zoned with XMg [Mg/(Mg+Fe)] lower at the rim than in the core (e.g. core: XAlm 0 |  | | Journal (article/letter/editorial) | | authors are printed in SMALLCAPITALS,Subjects in lower-case roman, and Localities in italics. The minerals...Zealand, grandidierite, 615. Blende, Algeria, Austria, Congo, France, Greece Spain, Yugoslavia, cathodoluminescence...nodules, olivine, orthopyroxene, clinopyroxene, spinel, 375. Brockham, Surrey, heulandite, 480. Brittle...see ATTEWELL(P. R.), 428. Burgstein, Oetztal, Austria, omphacite, 61. BURKE (E. A. J.), KIEFT(C.), FELItJS(R...posjnakite, 74o. Dreiser Weiher, Eifel, Germany, spinel-lherzolite xenoliths, 726. Dunite, New Zealand |  | | Journal (article/letter/editorial) | | as staurolite, corundum, and hercynite-dominant spinel. Detailed analysis of these domains indicates that...Alrich minerals such as corundum, Fe–Mg-bearing spinel and sapphirine surrounding relics of kyanite or...SiO2deficient area, corundum and Fe–Mg-bearing spinel may develop, although free quartz is ubiquitous...the appearance of corundum, hercynite-dominant spinel, and staurolite. One goal of the study is to analyze...the P–T conditions at which hercynite-dominant spinel, corundum and staurolite may be stabilized in eclogites |  | Vrabec, Mirijam, Janák, Marian, Froitzheim, Nikolaus, De Hoog, Jan C.M. (2012) Phase relations during peak metamorphism and decompression of the UHP kyanite eclogites, Pohorje Mountains (Eastern Alps, Slovenia) Lithos, 144. 40-55 doi:10.1016/j.lithos.2012.04.004 | Journal (article/letter/editorial) | | biotite after phengite and sapphirine+ corundum + spinel+ anorthite after kyanite. Sapphirine has composition...formation of peraluminous sapphirine, corundum and spinel after kyanite. 2. Geological setting UHP metamorphic...where the NW parts of the Austroalpine domain (Lower Central Austroalpine) formed the footwall, as they...Cretaceous HP/UHP metamorphism is restricted to the Lower Central Austroalpine domain. After the collisional...downward removal (subduction) of the mantle and lower crustal wedge overlying the subducted rocks (Froitzheim |  | | Journal (article/letter/editorial) | | spherical symplectitic aggregates consisting of lower-Al 2 O 3 clinopyroxene ŽCPX II. Ž- 5 wt.%. and plagioclase...plagioclase. Corundum is associated with spinel and plagioclase. Sapphirine occurs in two different mineralogical...partially converted to symplectitic aggregate of spinel and plagioclase. The earliest metamorphic mineral...collected aluminous mafic rocks from the garnet–spinel mylonite zone of Van der Wal and Vissers Ž1993...associated with clinopyroxene, orthopyroxene, green spinel and opaque minerals. Microfractures appear to provide |  | | Journal (article/letter/editorial) | | oisite1phengite1rutile1quartz. Corundum, Fe-Mg-spinel, sapphirine and högbomite occur as products of...various symplectites [corundum-plagioclase (pl), spinel-pl, sapphirine-pl, clinopyroxene-pl, biotite-pl...Greece and the approximate boundary between the lower and upper tectonic unit marked by the thrust faults...(1981) subdivided western and central Rhodope into a lower and an upper tectonic unit separated by an approximately...approximately SSE–NNW striking thrust plane. A lower and an upper tectonic unit were recognized also by Mposkos |  | | Journal (article/letter/editorial) | | Moldanubian Zone of the Bohemian Massif in Lower Austria 1 Department of Earth Sciences, University...granulites from exposed granulite complexes in Lower Austria. Thermobarometric evaluation integrated with...tectonic regime may have been concealed either because lower-pressure assemblages have overprinted mineralogical...indicated the granulites of the Moldanubian Zone in Lower Austria to have equilibrated at 8-5 kbar and 770 °C...the Moldanubian Zone of the Bohemian Massif in Austria, must have formed at higher pressures than his |  | | Journal (article/letter/editorial) | | com/locate/lithos Relict sapphirine + kyanite and spinel + kyanite associations in pyropic garnet from the...Available online 22 August 2006 Abstract Sapphirine, spinel, orthoamphibole ± quartz and kyanite are included...(1) sapphirine + kyanite, (2) spinel + kyanite, (3) sapphirine + spinel, (4) kyanite, and (5) orthoamphibole...Theoretical calculations of garnet + corundum + spinel ± sapphirine + kyanite equilibria in the FMAS system...constrain possible P–T conditions for a sapphirine + spinel + kyanite + garnet (XMg ≈ 0.55) assemblage to form |  | | Journal (article/letter/editorial) | | eclogites have been extensively overprinted by lower pressure assemblages and exhibit a variety of coronitic...replacement of kyanite by sapphirine–plagioclase, spinel–plagioclase and corundum–plagioclase symplectites;...rims can form during the subsequent unloading to lower crustal levels, and provide information on the shape...after omphacite; symplectite 2: associated with spinel in symplectites after kyanite; reaction rim: associated...the post-eclogite facies partial development of lower pressure mineral assemblages. High-P breakdown of |  | | Journal (article/letter/editorial) | | 1) comprising parts of Czechoslovakia, Poland, Austria and Germany. The block is truncated to the north-east...similar high grade nappes within the Moldanubian of Austria and Czecho- slovakia. On this basis, and following...granodioritic (Finger et al., 1989) Thaya (in Austria) or Brno (in Czechoslovakia) batholith yielding...now exposed, beneath the MZ, in the Thaya (in Austria) and Svratka (in Czechoslovakia) windows (Schulmann...with the Ramzova overthrust separating it from the lower temperature garnet-staurolite-andalusite schists |  | | Journal (article/letter/editorial) | | kyanite; instead it grew by digestion of former spinel-bearing symplectites, which, together with corundum...step. Initial kyanite breakdown to plagioclase, spinel, and corundum occurred through metasomatic addition...containing the alternative corundum + plagioclase or spinel + plagioclase two-phase assemblages, bounded by...components. The sapphirine overprint is confined to the spinel-bearing symplectite. Sapphirine laths display a...nearly constant volume replacement of the former spinel-bearing symplectite that is ascribed to an increase |  | | Journal (article/letter/editorial) | | secondary and is a product of reactions at pressures lower than the peak recorded pressure. In contrast to...which form at conditions attainable in the mid to lower levels of normal continental crust, high-pressure...Ca-Tschermaks-rich granulite facies pyroxene from those of lower grade (cf. Lovering & White, 1969). In metapelitic...orthopyroxene is taken to mark the transition to the lower temperature amphibolite facies. In this study, HP...replaced by orthopyroxene as melting occurs. At lower pressures, in the sillimanite field, this marks the |
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