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Cation diffusion in plagioclase feldspar.

S A Morse

    Science (New York, N.Y.)
    |August 3, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Intracrystalline diffusion of sodium and calcium in plagioclase feldspar is too slow to homogenize grains in slowly cooled intrusions. This suggests reactive equilibrium crystallization does not occur in dry magmatic systems.

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    Area of Science:

    • Geochemistry
    • Mineralogy
    • Petrology

    Background:

    • Igneous plagioclase feldspar exhibits compositional gradients in slowly cooled intrusive bodies.
    • Understanding diffusion kinetics is crucial for interpreting magmatic processes.

    Purpose of the Study:

    • To determine the maximum intracrystalline diffusion coefficient for NaSi-CaAl exchange in plagioclase.
    • To assess the occurrence of reactive equilibrium crystallization in dry magmatic systems.

    Main Methods:

    • Analysis of compositional gradients in plagioclase feldspar from slowly cooled intrusive bodies.
    • Modeling of diffusion processes to constrain the diffusion coefficient.

    Main Results:

    • A maximum intracrystalline diffusion coefficient (Dmax) of approximately 10(-20) cm²/s for NaSi-CaAl exchange was implied.

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  • This diffusion rate is insufficient to homogenize millimeter-sized plagioclase grains over geologic timescales.

    • Conclusions:

    • Reactive equilibrium crystallization of plagioclase from melt does not occur in dry systems due to slow diffusion kinetics.
    • The findings have implications for understanding magma evolution and the formation of igneous rocks.