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Rates of hydrothermal reactions.

B J Wood, J V Walther

    Science (New York, N.Y.)
    |October 28, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Silicate and aqueous fluid reaction rates follow zero-order kinetics, determined by surface area. A single equation accurately predicts reaction rate constants across various silicate reactions and temperatures.

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    Area of Science:

    • Geochemistry
    • Chemical Kinetics
    • Materials Science

    Background:

    • Silicate mineral reactions are fundamental to geological processes.
    • Understanding reaction kinetics is crucial for predicting mineral behavior in geological systems.
    • Previous models often lacked a unified approach for diverse silicate-fluid interactions.

    Purpose of the Study:

    • To establish a universal kinetic model for silicate-aqueous fluid reactions.
    • To determine the relationship between reaction rate, temperature, and surface area.
    • To validate the model across different reaction types.

    Main Methods:

    • Analysis of reaction rate data for various silicate minerals.
    • Application of zero-order kinetic principles.

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  • Derivation and validation of a predictive equation for the rate constant (k).

    • Main Results:

    • Silicate-fluid reaction rates exhibit zero-order kinetics dependent on reacting surface area.
    • A single equation, log k = -2900/T - 6.85, accurately describes the rate constant (k) across temperatures (T).
    • This kinetic model is applicable to dissolution, fluid production, and solid-solid transformations in moderate to high pH fluids.

    Conclusions:

    • A unified kinetic framework simplifies the study of diverse silicate-fluid reactions.
    • The derived equation provides a powerful tool for geochemical modeling and predicting mineral alteration.
    • The findings have implications for understanding geological fluid-rock interactions and material transformations.