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Boron in sillimanite.

E S Grew, J R Hinthorne

    Science (New York, N.Y.)
    |August 5, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Sillimanite in high-temperature rocks incorporates boron, influencing its chemical composition. This boron substitution is linked to magnesium and occurs under specific high-temperature, low-water conditions.

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    Area of Science:

    • Mineralogy
    • Geochemistry
    • Petrology

    Background:

    • Sillimanite is a key aluminum silicate mineral in metamorphic rocks.
    • The role of trace elements, like boron, in mineral stability is an active area of research.
    • Previous studies have not fully elucidated boron incorporation in sillimanite under granulite-facies conditions.

    Purpose of the Study:

    • To quantify boron (B2O3) and magnesium (MgO) content in sillimanite from kornerupine-bearing granulites.
    • To investigate the coupled substitution mechanisms of boron and magnesium in sillimanite.
    • To determine the conditions under which sillimanite incorporates significant amounts of boron.

    Main Methods:

    • Chemical analysis of sillimanite from six granulite-facies rock samples.

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  • Microprobe analysis to determine B2O3 and MgO concentrations (weight percent).
  • Thermodynamic modeling to assess the influence of boron on sillimanite stability.

    • Main Results:

    • Sillimanite contains 0.035–0.43% B2O3 and 0.02–0.23% MgO.
    • Coupled substitution of B for Si and Mg for Al occurs, with a Mg:B ratio of approximately 0.5.
    • Significant boron incorporation (>0.1% B2O3) requires high temperatures, boron-rich environments, and very low water partial pressures.

    Conclusions:

    • Boron substitution in sillimanite is controlled by temperature, boron availability, and water fugacity.
    • The observed Mg-Al and B-Si coupled substitutions are significant in granulite-facies sillimanite.
    • In amphibolite-facies conditions, boron content in sillimanite is too low to affect its stability relative to kyanite and andalusite.