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  • 1
    Monographie ausleihbar
    Monographie ausleihbar
    Applied isotope hydrogeology : a case study in Northern Switzerland (1991)
    Amsterdam [u.a.] : Elsevier
    Dazugehörige Bände
    Details Verfügbarkeit
    Signatur: M 92.1174
    In: Studies in environmental science
    Materialart: Monographie ausleihbar
    Seiten: XXIV, 439 S.
    ISBN: 0444889833
    Serie: (Studies in environmental science 43) (Technical report/NAGRA 88-01)
    Sprache: Englisch
    Standort: Kompaktmagazin oben
    Zweigbibliothek: GFZ Bibliothek
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  • 2
    Digitale Medien
    Digitale Medien
    Introduction to mineralogy by C. W. Correns (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 286-286 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889870006258
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  • 3
    Digitale Medien
    Digitale Medien
    The Cerchar Abrasivity Index and its relation to rock mineralogy and petrography (1982)
    Springer
    Rock mechanics and rock engineering 15 (1982), S. 1-8 
    Details
    ISSN: 1434-453X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie
    Notizen: Summary The Cerchar Abrasivity Index and Its Relation to Rock Mineralogy and Petrography To evaluate the relation between the Cerchar Abrasivity Index (a parameter used in calculating advance rates of full face tunnelling machines) and the petrography of the rocks, measurements were made on minerals and monomineralic rocks. From these data a theoretical abrasivity (quartz equivalence) can be calculated for every rock composition. From the comparison of the theoretical and experimentally determined abrasivity the influence of fabric and other factors besides mineralogical composition were deduced.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01239473
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  • 4
    Digitale Medien
    Digitale Medien
    Pyroxmangite: Stability in H2O-CO2 mixtures at a total pressure of 2000 bars (1971)
    Springer
    Contributions to mineralogy and petrology 32 (1971), S. 267-273 
    Details
    ISSN: 1432-0967
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract The curve of the reaction: 1 Rhodochrosite + 1 Quartz ⇌ Pyroxmangite was determined experimentally using gas mixtures with different CO2H2O ratios at a total pressure of 2 kb. In pure CO2, the equilibrium temperature is 508±2° C. By plotting the equilibrium data in terms of InXCO2 versus reciprocal temperature, a ΔH of reaction of 51.7 kcal was obtained. This plot shows a straight-line relationship, indicating internal consistency of the data, and is in good agreement with previous findings that CO2 and H2O mix ideally within the investigated temperature range (400–600° C). When applied to pyroxmangites formed during moderate greenschist facies metamorphism, these data indicate a high acitivity of H2O.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00373344
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  • 5
    Digitale Medien
    Digitale Medien
    Hydrothermal synthesis of pyroxenoids in the system MnSiO3-CaSiO3 at Pf=2 kb (1975)
    Springer
    Contributions to mineralogy and petrology 50 (1975), S. 241-246 
    Details
    ISSN: 1432-0967
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Pyroxenoids on the join MnSiO3-CaSiO3 were synthesized from (Mn, Ca)-carbonate solid solutions and SiO2 in CO2-H2O mixtures at a total pressure of 2 kb. The type of structure found (pyroxmangite, rhodonite, bustamite or wollastonite) is mainly dependent on the Mn/Ca ratio, but also to a lesser extent on temperature. Johannsenite-type structures were encountered at low temperatures over a wide compositional range. It has been possible to convert the pyroxenoids pyroxmangite → rhodonite, rhodonite → bustamite, bustamite → wollastonite, and johannsenite → bustamite or wollastonite with increase of temperature, but not the reverse. The compositional ranges of the synthetic pyroxenoids are very similar to those found in natural pyroxenoids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00394851
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  • 6
    Digitale Medien
    Digitale Medien
    Manganese pyroxenoids and carbonates: Critical phase relations in metamorphic assemblages from the Alps (1978)
    Springer
    Contributions to mineralogy and petrology 66 (1978), S. 383-388 
    Details
    ISSN: 1432-0967
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract The compositions of coexisting pyroxmangites, rhodonites, rhodochrosites and manganese calcites in regional metamorphosed manganese cale-silicate marbles from Val Scerscen and Alagna were analysed by microprobe and permit definition of critical tie lines at metamorphic grades appropriate to temperatures between 400 and 450 °C. Variations in composition of coexisting mineral pairs in one and the same locality are attributed to variations in $$f_{{\text{CO}}_{\text{2}} }$$ and not to metamorphic temperatures. From the analysed assemblages isothermal $$f_{{\text{CO}}_{\text{2}} } - X_{{\text{Ca/Ca + Mn}}}$$ plots (with SiO2 as excess component) were constructed for the system CaO-MnO-SiO2-CO2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00403423
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  • 7
    Digitale Medien
    Digitale Medien
    The miscibility gap between rhodonite and bustamite along the join MnSiO3-Ca0.60Mn0.40SiO3 (1980)
    Springer
    Contributions to mineralogy and petrology 74 (1980), S. 261-269 
    Details
    ISSN: 1432-0967
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract The miscibility gap between rhodonite and bustamite has been experimentally determined at temperatures between 600° and 1,100° C. For temperatures below 700° C the resulting limbs have been extrapolated on T-X-diagram as at such low temperatures equilibrium could not be attained. According to microprobe analyses for the natural assemblages of Ravinella di Sotto (Ivrea zone, Italy) and Broken Hill (N.S.W., Australia) equilibrium temperatures are estimated to be at 500° to 550° C. However these assemblages are thought to have re-equilibrated during cooling and the compositions of equilibrium assemblages are also pressure dependent. According to experiments and to molar volume data the rhodonite structure is stabilized by high pressures whereas bustamite by high temperatures. Based on available experimental results and natural data an isobaric T-X Ca diagram and two isotherm $$X_{CO_2 }$$ -X Ca diagrams (for T=400° C and T=600° C) are given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00371696
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  • 8
    Digitale Medien
    Digitale Medien
    Distribution of Mg, Fe, Al, Ca and Na in coexisting olivine, orthopyroxene and clinopyroxene in the Totalp serpentinite (Davos, Switzerland) and in the Alpine metamorphosed Malenco serpentinite (N. Italy) (1968)
    Springer
    Contributions to mineralogy and petrology 18 (1968), S. 65-75 
    Details
    ISSN: 1432-0967
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract The primary minerals of a partly serpentinized Alpine type ultrabasic mass, lying in a zone of low Alpine metamorphism, were analysed with an electron microprobe. The distribution coefficients of Mg and Fe in coexisting orthopyroxenes, clinopyroxenes and olivines indicates an equilibrium temperature of around 1400°C. The Ca/Ca+Mg ratios in the clinopyroxenes indicate temperatures between 800° and 1000°C. This discrepancy in temperature estimations can partly be explained by the high Al2O3-contents of the clinopyroxenes, since a good correlation between Al2O3-contents and Ca/Ca+Mg ratio was found. The Na2O-content of the clinopyroxenes decreases in the successive pyroxenites that differentiated from the main lherzolite. From the mineralogical composition of the different rock types and the chemical compositions of the minerals it is concluded that the Totalp peridotite originated in the Upper Mantle. In the Malenco serpentinite, the clinopyroxenes formed during the rather strong Alpine metamorphism are much poorer in Al2O3 and Na2O than the primary clinopyroxenes. On the other hand, the olivines, grown postdeformationally during the Alpine metamorphism, are not much different in composition to the primary olivines.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00371986
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  • 9
    Digitale Medien
    Digitale Medien
    The experimental investigation of the reactions MnCO3+SiO2=MnSiO37#x002B;CO2 and MnSiO3+MnCO3=Mn2SiO4+CO2 in CO2/H2O gasmixtures at a total pressure of 500 bars (1975)
    Springer
    Contributions to mineralogy and petrology 52 (1975), S. 261-266 
    Details
    ISSN: 1432-0967
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract The equilibrium constants for the reaction (2) Rhodochrosite + Quartz=Pyroxmangite+CO2 obtained are:logK(2)(bars)= $$\begin{gathered}{\text{log}}f_{co_2 } = - \frac{{(9862 \pm 102)}}{T} \hfill \\+ (15.887 \pm 0.220) + (0.1037 \pm 0.0020)\frac{{P - 1}}{T} \hfill \\\end{gathered} $$ and for the reaction (3) Rhodochrosite+Pyroxmangite=Tephroite+CO2: logK(3)(bars)= $$\begin{gathered}{\text{log}}f_{co_2 } = - \frac{{(6782 \pm 205)}}{T} \hfill \\+ (11.296 \pm 0.304) + (0.0835 \pm 0.0030)\frac{{P - 1}}{T} \hfill \\\end{gathered} $$ The present data lie within reasonable limits of error of the values calculated from previous experimental results at P tot = 2000 bars.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00401456
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  • 10
    Digitale Medien
    Digitale Medien
    Chromite deposits in the ophiolite complex of Northern Oman (1974)
    Springer
    Mineralium deposita 9 (1974), S. 253-259 
    Details
    ISSN: 1432-1866
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract In the ophiolite series of N. Oman numerous small and large elongated podiform chromite deposits occur within the peridotite complex at a certain level of 100–200 meters below the layered zone, which grades into the overlying gabbro complex. The chromite grains were corroded after their deposition; their composition shows a large variation in Cr/Al ratio and a small variation in Cr/Fe ratio. The chromium is thought to have been liberated from clino-pyroxenes during partial melting of lherzolitic upper mantle material. Precipitation of large quantities of chromite at the specific level below the gabbro complex is related to the plagioclase- /spinel-lherzolite transition, but the influence of a change in oxygen fugacity is also considered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00203999
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