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  • 1
    Electronic Resource
    Electronic Resource
    Metamorphism and metallogeny in the Eastern Alps (1999)
    Springer
    Mineralium deposita 34 (1999), S. 614-629 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The two Alpine orogenic phases of the Eastern Alps, in the Cretaceous and in the Tertiary, were both accompanied by the formation of mineral deposits. However, subduction-related magmatic belts as well as the typical “Andean” ore deposits are missing. Therefore, the role of metamorphism in East Alpine metallogeny was tentatively explored for more than 60 y, although for a long time without tangible results. Microthermometric, geochemical and isotopic investigations of fluid inclusions from selected Alpine mineral deposits presented allow a preliminary confirmation of the involvement of metamorphic fluids in their origin. Deposits which were formed immediately after the first, Cretaceous orogeny, were produced at high pressures by fluids of very high salinity and high density, and with an isotopic composition of the water falling into the metamorphic field. These fluids are best understood as products of metamorphic de-volatilization of rocks of the subducted South Pennine domain. In contrast to this, the deposits formed after the second, Tertiary orogeny, originated at relatively low pressures from fluids with an appreciable content of CO2 and of low to moderate salinities. Isotopic compositions of this carbon indicate a deep crustal or even mantle source for CO2, while the water is isotopically more heterogeneous and may have mixed sources, both surficial and metamorphic. Tectonic control of these mineralizations is late-orogenic trans-tensional faulting, which exposed hot metamorphic rocks to fluid convection along brittle structures. These deposits conform best to the model of metamorphogenic metallogenesis by retrograde leaching, although ponded metamorphic fluids and mantle volatiles may also have been involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001260050223
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  • 2
    Electronic Resource
    Electronic Resource
    On an implementation of standard bases and syzygies in SINGULAR (1996)
    Springer
    Applicable algebra in engineering, communication and computing 7 (1996), S. 235-249 
    Details
    ISSN: 1432-0622
    Keywords: Standard bases ; Syzygies ; Computer algebra system ; Highest corner ; EcartMethod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract We describe an implementation of a general standard basis algorithm, valid for any monomial ordering compatible with the natural semigroup structure. We concentrate on new strategies which have proved useful, in particular in the non-wellordering case. Moreover, we describe the first implementation of Schreyer's method to compute syzygies and compare it with other, more classical methods. Comparisons of the computing time of several examples in the system SINGULAR give hints as to which strategies should be used in different classes of examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190332
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  • 3
    Electronic Resource
    Electronic Resource
    On an Implementation of Standard Bases and Syzygies in SINGULAR (1996)
    Springer
    Applicable algebra in engineering, communication and computing 7 (1996), S. 235-249 
    Details
    ISSN: 1432-0622
    Keywords: Key words Standard bases ; Syzygies ; Computer algebra system ; Highest corner ; EcartMethod.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract  We describe an implementation of a general standard basis algorithm, valid for any monomial ordering compatible with the natural semigroup structure. We concentrate on new strategies which have proved useful, in particular in the non-wellordering case. Moreover, we describe the first implementation of Schreyer’s method to compute syzygies and compare it with other, more classical methods. Comparisons of the computing time of several examples in the system SINGULAR give hints as to which strategies should be used in different classes of examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190332
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Tertiary metallogenesis in the Eastern Alps: the Waldenstein hematite deposit (Austria) (1995)
    Springer
    Geologische Rundschau 84 (1995), S. 831-842 
    Details
    ISSN: 0016-7835
    Keywords: Key words Austroalpine Crystalline Complex ; Tertiary mineralization ; Hydrothermal veins ; Stable isotope analyses ; Microthermometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The specularite deposit at Waldenstein is an epigenetic replacement/vein-type hematite mineralization with distinct alteration zones. It is situated in highly metamorphosed schists and gneisses of the Koralm Crystalline Complex. Sericitization and chloritization are strictly bound to this alteration and occur within a few meters of the hematite veins. Radiometric dating of the sericitization and the implicity of the mineralization yield a Middle Eocene age. Petrographic evidence proves an early, relatively reduced paragenesis (magnetite, ilmenite) being partly replaced by hematite and chlorite during the main phase of ore formation. Fluid inclusion and stable isotope investigations indicate that formation temperatures were approximately 300  °C during the main stage and decreased to 200  °C in the latest stage of the hydrothermal event. The H-isotope compositions of chlorites and of fluid inclusions in quartz indicate the influence of seawater. This also explains the high salinities determined by fluid inclusion studies (20–30% NaCl equiv.). According to the genetic model presented in this paper the hydrothermal activity started when the deformation accompanying the uplift of the Koralm Crystalline Complex passed from a ductile to brittle regime (Middle Eocene). The brittle faults acted as channelways for rising, deep fluids, probably of metamorphic origin. Temperature differences between the different uplifting crustal segments supported fluid circulation. Precipitation of the ore occurred at shallow crustal levels where the hydraulic regime was dominated by seawater, and oxidation of the original reducing fluids took place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240571
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  • 5
    Electronic Resource
    Electronic Resource
    Tertiary metallogenesis in the Eastern Alps: the Waldenstein hematite deposit (Austria) (1995)
    Springer
    International journal of earth sciences 84 (1995), S. 831-842 
    Details
    ISSN: 1437-3262
    Keywords: Austroalpine Crystalline Complex ; Tertiary mineralization ; Hydrothermal veins ; Stable isotope analyses ; Microthermometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The specularite deposit at Waldenstein is an epigenetic replacement/vein-type hematite mineralization with distinct alteration zones. It is situated in highly metamorphosed schists and, gneisses of the Koralm Crystalline Complex. Sericitization and chloritization are strictly bound to this alteration and occur within a few meters of the hematite veins. Radiometric dating of the sericitization and the implicity of the mineralization yield a Middle Eocene age. Petrographic evidence proves an early, relatively reduced paragenesis (magnetite, ilmenite) being partly replaced by hematite and chlorite during the main phase of ore formation. Fluid inclusion and stable isotope investigations indicate that formation temperatures were approximately 300°C during the main stage and decreased to 200°C in the latest stage of the hydrothermal event. The H-isotope compositions of chlorites and of fluid inclusions in quartz indicate the influence of seawater. This also explains the high salinities determined by fluid inclusion studies (20–30% NaCl equiv.). According to the genetic model presented in this paper the hydrothermal activity started when the deformation accompanying the uplift of the Koralm Crystalline Complex passed from a ductile to brittle regime (Middle Eocene). The brittle faults acted as channelways for rising, deep fluids, probably of metamorphic origin. Temperature differences between the different uplifting crustal segments supported fluid circulation. Precipitation of the ore occurred at shallow crustal levels where the hydraulic regime was dominated by seawater, and oxidation of the original reducing fluids took place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240571
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen zur armverhältnisbestimmung am spätreplizierenden X-Chromosom des Menschen (1971)
    Springer
    Human genetics 〈Berlin〉 12 (1971), S. 302-315 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Das Armverhältnis des spätreplizierenden X-Chromosoms wurde bei 5 Kontrollpersonen, 5 47,XXY Klinefelter-Patienten, 1 46/47,XX/XXX-Mosaik und 1 45/46,X/XX-Mosaik bestimmt. Die statistische Analyse der erhaltenen Werte zeigt, daß die Methode der Armverhältnisbestimmung durch Messung der Armlängen an vergrößert projizierten Chromosomen als geeignet erscheint. Die Mittelwerte der Armverhältnisse der 5 Kontroll-personen können nicht als gleich angesehen werden. Der gesamte Mittelwert der Armverhältnisse ist signifikant kleiner (1,487) für die Klinefelter-Patienten als für die Kontrollpersonen (1,546). Die Werte für die Mosaike XX/XXX (1,557) und XO/XX (1,528) liegen im Bereich der Normalwerte.
    Notes: Summary The arm ratio of the late replicating X-chromosome was determined in 5 control persons, 5 47,XXY Klinefelter patients, 1 46/47,XX/XXX mosaic and 1 45/46,X/XX mosaic. The analysis of the values obtained shows that the method of defining the arm ratio by means of measuring arm lengths on drawings of highly magnified projected chromosomes proves practicable. The mean values of the arm ratios of the 5 control persons cannot be valued as equal. The total mean value of the arm ratios is significantly smaller (1.487) for the Klinefelter patients than for the normal control persons (1.546). The values of the mosaics XX/XXX (1.557) and XO/XX (1.528) lie in the range of the control values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278050
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Die Hellphase des Elektrooculogramms bei unterschiedlichen Beleuchtungsstärken (1971)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 182 (1971), S. 357-362 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Von 80 gesunden Versuchspersonen 200 EOG abgeleitet. Es sollte der Einfluß unterschiedlicher Netzhautbeleuchtungsstärke im Bereich von 10 000–70 000 td auf das EOG untersucht werden. Die Versuchsergebnisse zeigen, daß Netzhautbeleuchtungsstärken dieser Größenordnung (über 10 000 td) zu keiner weiteren Beeinflussung des EOG führen.
    Notes: Summary 80 normal persons were studied in order to access possible interrelationships between the EOG- and the retinal illumination of 10 000–70 000 td. The results of these experiments clearly indicated that the EOG is not affected by these different levels of retinal illumination. Increasing illumination beyond 10 000 td causes no further increase of the potentials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411968
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