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  • 1
    Electronic Resource
    Electronic Resource
    Crystal growth and characterization of ''striation-free'' KTa"1"-"xNb"xO"3 (x ~ 0.26) solid solutions
    Amsterdam : Elsevier
    Journal of Crystal Growth 62 (1983), S. 291-298 
    Details
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(83)90306-8
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new partial substitution mechanism of CO 3 2− /CO3OH3− and SiO 4 4− for the PO 4 3− group in hydroxyapatite from the Kaiserstuhl alkaline complex (SW-Germany) (1985)
    Springer
    Contributions to mineralogy and petrology 91 (1985), S. 360-368 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Based on a detailed mineral-chemical investigation of apatite from a series of carbonatites and associated silicate volcanic rocks of the Kaiserstuhl tertiary alkaline volcanic centre, evidence for a new substitution mechanism was found within the hydroxyapatite group, yielding the following simplified formula: (Ca, Sr, LREE)10(SiO4)x(CO3)x(PO4)6−2x(OH, F)2 with 0〈x〈1.2 LREE represents light rare-earth elements such as Ce, La, and Nd. Other elements were detected included Cl, S and traces of Mg, Al, K, Fe, Mn, and Th, however they have no effect on the substitution mechanism found. F is present in varying amounts, although well under half of the total possible halogen content (3.7 wt.% F), and shows a distinct antipathetic concentration correlation with REE and Si (and in turn with C). Charge balance is generally maintained by the coupled substitution of CO 3 2− and SiO 4 4− for PO 4 3− ; however, excess charge may be subsequently adjusted by CO3OH3− partly accompanied by the REE in the Ca site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00374692
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Trace elements and the behaviour of the U-Pb system in inherited and newly formed zircons (1974)
    Springer
    Contributions to mineralogy and petrology 43 (1974), S. 71-82 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The distribution of U, Y, P, and Ca was studied with an electron microprobe in detrital zircons from paragneisses of amphibolite to granulite facies as well as in zircons formed in their present-day host rocks, such as a granite, anatectic and aplitic gneisses and a migmatite from the Southern Alps. Detrital paragneiss zircons have low trace element contents, whereas zircons formed in their present-day host rocks have elevated trace element contents. According to the isotopic U-Pb age pattern one may distinguish two types of zircon populations formed in their present-day host rocks: one which lost lead without any known exogene cause, and one the U-Pb system of which was only opened in response to a geological event. Different modes of incorporation of the trace elements in the zircon crystals are thought to be responsible for this different behaviour and are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384653
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  • 4
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00403423
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  • 5
    Electronic Resource
    Electronic Resource
    Trapped phosphate melt inclusions in silicate-carbonate-hydroxyapatite from comb-layer alvikites from the Kaiserstuhl carhonatite complex (SW-Germany) (1985)
    Springer
    Contributions to mineralogy and petrology 91 (1985), S. 354-359 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Structural and crystal-chemical observations on acicular and skeletal silicate-carbonate-hydroxyapatite crystals (SCHap) from comb-layer alvikite dykes of the Kaiserstuhl carbonatite complex yield strong evidence for their being quenched products. As well as being intimately intergrown with calcite, they also contain distinctive primary phosphate inclusions. In contrast to the host apatite, these inclusions are free of Si, low in LREE but enriched in Sr and the volatiles F and S, and contain a high concentration of Na. This pronounced fractionation combined with the absence of x-ray diffraction and electron diffraction patterns suggests that the phosphate inclusions represent portions of a trapped residual phosphate melt. Therefore the SCHap are considered to be the direct liquidus phase of a carbonate-phosphate melt. That two phosphate phases coexist, however, presumes strong enrichment of phosphorous in the parental carbonatitic melt, since the eutectic would otherwise produce calcite and apatite only. The formation of sharply interfaced apatite- and calcite-comb-layers and the occurrence of trapped phosphate melt inclusions in the quench apatites argue for the existence of two immiscible liquids such as a phosphate-rich and a carbonate-rich melt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00374691
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    Paper (German National Licenses)
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