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  • 1995-1999  (1)
  • 1980-1984  (2)
  • 1930-1934  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Ordering and unmixing of alkali feldspars in a porphyritic granite and its country rocks (1982)
    Springer
    Mineralogy and petrology 30 (1982), S. 117-128 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung 60 Alkalifeldspäte aus einem varistischen porphyrischen Granit und 27 Alkalifeldspäte aus zwei verschiedenen Nebengesteinen (Metamorphosealter kaledonisch bzw. varistisch) wurden chemisch analysiert und auf ihren Strukturzustand hin untersucht. Der Ordnungszustand wird imbc-Diagramm nachStewart undWright (1974) dargestellt, die Entmischung in einem Variationsdiagramm mit den Or-Gehalten des Gesamtfeldspats bzw. der entmischten K-reichen Phase als Achsen. Die Feldspäte des Granits sind hinsichtlich Chemismus, Ordnungsgrad und Entmischungsgrad variabler als die der Nebengesteine. Ordnung und Entmischung hängen im wesentlichen vom Einfluß der wäßrigen fluiden Phase ab. Während der in situ-Bildung des Granits muß sich H2O im Magma angereichert haben und nach der Erstarrung noch im Granit gewesen sein. Anhand des Zwei-Feldspat-Geothermometers wurden Modelltemperaturen abgeleitet. Die erhaltenen Werte weisen auf einen selektiven Velust von Natrium aus dem Alkalifeldspat während des postmagmatischen Stadiums vor der Entmischung hin. Der Na-Verlust macht den Entmischungsvorgang träger.
    Notes: Summary 50 alkali feldspars from a Variscan porphyritic granite and 27 from two country rocks of Caledonian and Variscan age respectively have been investigated for their bulk chemistries and their structural states. Ordering is illustrated in thebc-plot afterStewart andWright (1974); unmixing is illustrated in a newly designed diagram with the Or-contents of the bulk feldspar and that of the unmixed K-rich phase on the coordinates. The feldspars from the granite have a greater variability with regand to chemistry, degree of ordering and degree of unmixing than those of the country rocks. Ordering and unmixing depend mainly on the action of a hydrous fluid phase. During the in situ formation of the granite, water must have accumulated in the granitic magma and must have remained in the granite after consolidation. Temperatures derived by means of the two feldspar geothermometer indicate selective loss of sodium during the postmagmatic stage and before unmixing of the alkali feldspars. Loss of sodium makes unmixing increasingly sluggish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082499
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  • 2
    Electronic Resource
    Electronic Resource
    Petrology of garnet-, spinel-, and sillimanite-bearing granites from the bavarian forest, West Germany (1984)
    Springer
    Mineralogy and petrology 33 (1984), S. 67-75 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Zusammenfassung Proben von 17 kleinen, spätvariskischen Granitintrusionen wurden chemisch und petrographisch untersucht. Alle 17 enthalten Biotit, 14 Cordierit, 6 Andalusit, 2 Granat, grünen Spinell und Sillimanit. Die Granite sind peralumisch (normativer Korund zwischen 1,0 und 3,5%) und haben hohe Differentiationsindizes (DI zwischen 87 und 97). Der Biotit und der Granat der granatführenden Granite sind reich an Eisen, der Mangangehalt ist mäßig hoch (MnO zwischen 3 und 5%), der Spinell ist im wesentlichen Hercynit mit 2 bis 16% ZnO. Aus den Gefügebeziehungen läßt sich folgende Kristallisationsfolge der Al-haltigen Minerale (ohne Feldspäte) ableiten: Cordierit 1+Biotit 1, Reaktion von Biotit 1 und etwas Cordierit 1 zu Granat (+ Sillimanit?), Säume von Cordierit 2 und Biotit 2 um Granat, Sprossung von grünem Spinell in Plagioklaskernen, Cordierit 1 und um Sillimanit. Während des magmatischen Stadiums lag der Druck zwischen 2 und 3 kb. Der Spinell ist keine magmatische Phase.
    Notes: Summary Samples from 17 small granitic intrusions of late-Variscan age have been investigated for their chemical compositions and petrographic characteristics. All of them contain biotite, 14 cordierite, 6 andalusite, 2 gamet, green spinel, and rare sillimanite. The granites are peraluminous (normative corundum between 1.0 and 3.5 per cent) and highly evolved (DI between 87 and 97). Biotite and garnet in the garnet bearing granites are highly ferrous, MnO in garnet is moderate (3 to 5 per cent), the spinel is essentially hercynite with 2 to 16 per cent ZnO. From textural relationships the sequence of crystallization of the aluminous minerals is deduced as: cordierite 1+biotite 1, reaction of biotite 1 and some cordierite 1 to garnet (+ sillimanite?), rimming of garnet by cordierite 2 and biotite 2, growth of spinel in plagioclase, in cordierite 1, and around sillimanite. The pressure during the magmatic stage was between 2 and 3 kb. The spinel is not a magmatic phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01082302
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  • 3
    Electronic Resource
    Electronic Resource
    Cytologische Untersuchungen an Antirrhinum (1934)
    Springer
    Planta 22 (1934), S. 368-374 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01916326
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  • 4
    Electronic Resource
    Electronic Resource
    Fortschritte der Cytologie in der Austausch- und Konjugationsfrage (1933)
    Springer
    Theoretical and applied genetics 5 (1933), S. 249-257 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01831185
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  • 5
    Electronic Resource
    Electronic Resource
    Referate (1934)
    Springer
    Theoretical and applied genetics 6 (1934), S. 310-316 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01813303
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  • 6
    Electronic Resource
    Electronic Resource
    Referate (1934)
    Springer
    Theoretical and applied genetics 6 (1934), S. 241-248 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01811848
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  • 7
    Electronic Resource
    Electronic Resource
    Ocean floor basalt, not continental gabbro: a reinterpretation of the Hoher Bogen amphibolites, Teplá-Barrandian, Bohemian massif (1998)
    Springer
    Geologische Rundschau 87 (1998), S. 303-313 
    Details
    ISSN: 0016-7835
    Keywords: Key words Bohemian massif ; Teplá-Barrandian ; Hoher Bogen ; Ocean floor basalt ; Variscan metamorphism ; High grade
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract At its southern margin along the Hoher Bogen mountain, the Teplá-Barrandian (Bohemian massif, Central Europe) is made up of a 1- to 4-km wide belt of amphibolites. An upper amphibolite/lower granulite facies Variscan metamorphism has brought forth coarse-grained, weakly foliated rocks with hbl+pl±cpx±opx±grt parageneses. Since the beginning of this century, these rocks, together with fine-grained or mylonitized amphibolites, have been regarded as metamorphic gabbros (gabbro amphibolites) of the Neukirchen-Kdyne igneous complex. Relics of magmatic textures, however, cannot be found anywhere. The amphibolites are therefore reinterpreted as metamorphic basalts. The Hoher Bogen amphibolites (HBA) derive from N-type MORB. The most primitive samples have Mg#s between 60 and 65. Locally occurring (garnet-)hornblendites and leucodioritic mobilisates are the products of partial melting of amphibolites during the Variscan metamorphism and do not belong to the primary magmatic rock association. Ultramafic rocks are tectonically emplaced between the HBA belt and the metapelitic rocks of the Moldanubian. At the very least, the metapyroxenites among them seem to have a cumulus origin. Together with the ultramafic rocks, the HBA belt may be regarded as a metaophiolite, comparable to the Mariánské Lazne complex. The reinterpretation of the former "gabbro amphibolites" as a metaophiolite has consequences for the geology of the Teplá-Barrandian: the size of the Neukirchen-Kdyne igneous complex is reduced. The HBA belt is a piece of oceanic crust which is possibly younger than the Precambrian metasedimentary/metavolcanic country rock of the Neukirchen-Kdyne igneous complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050211
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  • 8
    Electronic Resource
    Electronic Resource
    Cytologische Untersuchungen an Limnanthes Douglasii R. Br. (1934)
    Springer
    Cell & tissue research 21 (1934), S. 357-374 
    Details
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00587420
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    Paper (German National Licenses)
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