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| Geochemistry of garnet peridotite massifs from lower Austria and the composition of deep lithosphere beneath...spine1 and spinel-garnet harzburgites from lower Austria show major and trace element variations with...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 |
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| 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...granoblastic matrix of Al-rich clinopyroxene, Ca-rich plagioclase and minor hornblende. They were partially replaced...spinel + plagioclase formed around kyanite inclusions, (b) orthopyroxene + spinel + plagioclase ± hornblende |
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| Mineralogy pcao°logy © Springer-Verlag 1996 Printed in Austria Metamorphism and partial melting of paragneisses...Moldanubicum (Austria) M. Linner Institute of Petrology, University of Vienna, Austria With 7 Figures...of the Monotonous Group in the SE Moldanubicum (Austria). Two types of paragneisses have been distinguished:..."Granulitlamelle" (Fuchs and Scharbert, 1979). In the lower Ysper Valley, rocks of the Gf6hl Unit are exposed...Fig. 1. Tectonic map of the SE Moldanubicum (Lower Austria) from H6"gelsberger and Jawecki (1993) after |
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| 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...recrystallised to a granoblastic two-feldspar (plagioclase XA, -- 0.35--0.40 and K-feldspar) texture. Spinel...Spinel (XMg= 0.36) is found in the core of plagioclase aggregates and as inclusions in garnet. In the |
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| Berkshire; Ha#on attd Shabbington Wood, Buckinghamshire; Lower Froyle, Selt)orne, and West Worldham, tlampshire;...orthoclase, 489. Schyn-Schhtcht, Grisons, albite, I56. Austria (Osterreich) Burgstein, Oetztal, omphacite, 61...153. Meidling im Tal, Lower Austria, omphacite, 6I. Mitterbachgraben, Lower Austria, omphacite, 6i. Mitterburg... montebrasite, 414. Poland (Polska) Jordan6w, Lower Silesia, chromian hydrogrossular, 241. Nowa Wies...hydrogrossular, sheridanite, 735. India Chikla, Bhandara district, Maharashtra, juddite, 317, 7o8. Goldongri, Panchmahal |
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| 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...isotopic compositions and negative Eu anomalies in plagioclase-free pyroxenites indicate that the Os was derived...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 |
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| later-stage minerals (e.g. orthopyroxene, augite, plagioclase and spinel). Most garnet grains are <3 mm in...(Qtz) are present near this grain in the matrix. Plagioclase laths (Pl) invade margins of garnet in places...fine-grained kelyphites which consist of pyroxene + plagioclase [Ca/(Ca + Na) ¼ 0.60–0.91] + Fe-oxide (magnetite...[Mg/(Fe + Mg) ¼ 0.62–0.63] in places, but also plagioclase laths invade the garnet margin in some places...Kelyphite is absent from the places where the plagioclase laths develop. Thus, the mechanism of garnet |
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| 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...stability of the assemblage garnet + clinopyroxene + plagioclase + quartz in quartz-normative metabasites (De...indicated the granulites of the Moldanubian Zone in Lower Austria to have equilibrated at 8-5 kbar and 770 °C |
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| than 2.0 GPa at temperatures of 700–800 °C. Plagioclase-bearing assemblages, rich in hydrous phases,...orthopyroxene–plagioclase–spinel in garnet; plagioclase– sapphirine, plagioclase–corundum and plagioclase–spinel...plagioclase–spinel in kyanite; and diopside–plagioclase in omphacite. The microfractures are often arranged en echelon...Kayal et al., 1993) are evidence that the present lower crust may fracture. Pseudotachylyte formed at granulite...from orthopyroxene, spinel and anorthite to plagioclase and diopside, and when it crosses into quartz |
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| 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...belt of central Europe, (b) Geological map of the lower Auitrian and Czech part of the toutheastern Bohemian...garnetbearing high-temperature peridotite massifs from lower Austria (southern Bohemian massif). Taken together, |
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| 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 |
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| kyanite has been replaced by a symplectite of plagioclase, corundum, spinel and sapphirine. The sapphirine...been completely transformed into clinopyroxeneq plagioclase symplectite. A quantification of material transfer... kyanite in eclogite is often replaced by a plagioclase" corundumq spinel " sapphirine symplectite Že...corundumq plagioclase symplectite (S1 in Fig. 1a,b): Corundum is pure Al 2 O 3 and plagioclase is Ca-rich...symplectitisation front ŽFig. 1b.; (iii) spinelq plagioclase symplectite (S2 in Fig. 1a,b): Spinel has a composition |
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| sapphirine forms symplectitic intergrowths with plagioclase±corundum±spinel after kyanite. Kyanite and omphacite...to reaction textures suggests that sapphirine+plagioclase-forming reactions are a universal feature in...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 |
 | 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) |
| kbar, 700±800 °C) during which orthopyroxene (+plagioclase) formed from garnet and clinopyroxene. A further...further high temperature overprint at lower pressure (ca. 4 kbar) is re¯ected in the development of cordieriteand/or...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 |
 | 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) |
| symplectites of diopside + plagioclase + amphibole after omphacite, plagioclase + biotite after phengite...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...includes the Saualpe and Koralpe regions in Southern Austria. Three nappes are recognized in Pohorje Massif |
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| prior to the complete conversion of igneous plagioclase to omphacite. In the evolution following the... et grenat, avant la conversion complète du plagioclase igné en omphacite. Au cours de l’évolution suivant...have been reported to contain symplectites of plagioclase and Alrich minerals such as corundum, Fe–Mg-bearing...clinopyroxene breakdown cause the formation of a plagioclase mantle between kyanite and quartz. Local SiO2...which would otherwise produce amphibole and plagioclase. In this SiO2deficient area, corundum and Fe–Mg-bearing |
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| 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...orthoclase, anal., d2oi, 489; blende, galena, 852; plagioclase, 729; ullmannite (willyamite), 26. BROTHERS(R...see ATTEWELL(P. R.), 428. Burgstein, Oetztal, Austria, omphacite, 61. BURKE (E. A. J.), KIEFT(C.), FELItJS(R...grain-growth in strained, 852. Garbham, Srikakulam district, Andhra Pradesh, India, sahlite, hypersthene, |
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| 15, 203–222 Evolution of Moldanubian rocks in Austria: review and synthesis K . PE T R AK A KI S Institute...Vienna, Austria (Konstantin.petrakakis@univie.ac.at) A B S TR A CT The Moldanubian zone in Austria comprises...the Moravian zone. The range c. 340–335 Ma is the lower limit for completion of tectonic activity in the...of the early granitoid types took place in the lower crust in connection with the Hercynian high-grade...overprint. The Moldanubian Monotone series in Austria is separated from the other Moldanubian units by |
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| aggregates consisting of lower-Al 2 O 3 clinopyroxene ŽCPX II. Ž- 5 wt.%. and plagioclase. Corundum is associated...associated with spinel and plagioclase. Sapphirine occurs in two different mineralogical associations, i...fine-grained crystals in plagioclase-rich domain. The sapphirineq plagioclase aggregate suggests the former...converted to symplectitic aggregate of spinel and plagioclase. The earliest metamorphic mineral assemblage...decompression had possibly followed the compression of plagioclase-rich, low-pressure cumulate or residue. q 2001 |
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| pressures, whereas various symplectites [corundum-plagioclase (pl), spinel-pl, sapphirine-pl, clinopyroxene-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...metamorphic overprint), in rocks close together: the lower and upper tectonic units are characterized by metamorphic |
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| poikilitic clinopyroxene-plagioclase intergrowths indicating former plagioclase-free, i.e. eclogite facies...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...(Opx + Pl not stable). At higher pressures, plagioclase disappears in basic rocks by reactions such as |
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| eclogites have been extensively overprinted by lower pressure assemblages and exhibit a variety of coronitic...data indicate that the initial high-pressure, plagioclase-free assemblage was garnet q omphacite" kyanite"...clinopyroxene–plagioclase intergrowths after omphacite; the replacement of kyanite by sapphirine–plagioclase, spinel–plagioclase...spinel–plagioclase and corundum–plagioclase symplectites; and resorption of garnet by amphibole–plagioclase...rims can form during the subsequent unloading to lower crustal levels, and provide information on the shape |
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| the Area near Gloggnitz in the Graywacke Zone of Austria With 3 text-figures and 7 photos By A. V. PHADKE...of the 14 occurrences in the Graywacke Zone of Austria. This body occurs within the Silbersberg serie...serie of the Graywacke Zone of Upper Eastalpine of Austria. The Silbersberg serie, together with the quartz...the Graywacke zone of the Upper Eastalpine of Austria. The riebeckite gneiss forms a small body within...the riebeckite gneiss. Some minor outcrops of plagioclase porphyroid and diabase (?) also occur in the |
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| 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 |
 | Medaris, L. G., Ghent, E. D., Wang, H. F., Fournelle, J. H., Jelínek, E. (2006) The Spačice eclogite: constraints on the P–T–t history of the Gföhl granulite terrane, Moldanubian Zone, Bohemian Massif. Mineralogy and Petrology, 86 (3) 203-220 doi:10.1007/s00710-005-0095-3 | Journal (article/letter/editorial) |
| assemblage, garnet þ omphacite þ quartz þ rutile plagioclase, yields an estimate for peak metamorphic conditions...within amphibolite, and the presence of amphibole-plagioclase kelyphite around garnet in many amphibolite samples...to an assemblage of garnet þ clinopyroxene þ plagioclase amphibole, but eclogite is locally preserved...replaced by a relatively coarse symplectite of plagioclase, low-Na clinopyroxene, and amphibole. Minor amounts...amphibole and plagioclase are concentrated at the margins of garnet, and small grains of plagioclase are sporadically |
