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Gadolinium: Distribution between Aqueous and Silicate Phases.

R L Cullers, L G Medaris, L A Haskin

    Science (New York, N.Y.)
    |August 7, 1970
    PubMed
    Summary
    This summary is machine-generated.

    This study investigated trivalent gadolinium partitioning between silicate and aqueous phases at high temperatures and pressures. Gadolinium

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    Area of Science:

    • Geochemistry
    • High-temperature and high-pressure experimental petrology
    • Trace element partitioning

    Background:

    • Understanding trace element behavior in geological systems is crucial for interpreting Earth's processes.
    • Trivalent rare earth elements, like gadolinium, serve as important geochemical tracers.
    • High-pressure, high-temperature phase equilibria provide insights into magma evolution and ore formation.

    Purpose of the Study:

    • To quantify the partition coefficients of trivalent gadolinium (Gd³⁺) between silicate melts, silicate crystals, and aqueous fluids.
    • To investigate the influence of temperature and pressure on Gd³⁺ partitioning.
    • To compare experimental partitioning data with natural system estimates.

    Main Methods:

    • High-pressure, high-temperature piston-cylinder apparatus experiments.
    • Analysis of silicate phases (forsterite, enstatite, diopside) and coexisting aqueous phases.
    • Inductively Coupled Plasma Mass Spectrometry (ICP-MS) for trace element concentration measurements.

    Main Results:

    • Constant distribution coefficients for Gd³⁺ were observed across a wide range of concentrations in forsterite, enstatite, and diopside.
    • Ratios of crystal/aqueous to melt/aqueous distribution coefficients align with estimates from natural systems.
    • The activity of Gd³⁺ in silicate melts is significantly lower (<1/100) than in aqueous phases at equivalent concentrations.

    Conclusions:

    • Trivalent gadolinium exhibits predictable partitioning behavior in silicate-water systems under experimental conditions.
    • Experimental data support the use of Gd³⁺ as a tracer in understanding magmatic and hydrothermal processes.
    • The low activity of Gd³⁺ in melts has implications for its incorporation into accessory minerals and its mobility in the Earth's crust.