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Orthopyroxene exsolution in augite: a two-step, diffusion-transformation process.

A M Isaacs, D R Peacor

    Science (New York, N.Y.)
    |October 8, 1982
    PubMed
    Summary
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    Orthopyroxene lamellae grow from augite via a two-step process: calcium diffusion and clinohypersthene inversion. This mechanism explains orthopyroxene formation with clinohypersthene margins, supported by elemental gradient analysis.

    Area of Science:

    • Mineralogy
    • Geochemistry
    • Crystallography

    Background:

    • Augite, a calcium-rich pyroxene, commonly contains exsolved orthopyroxene lamellae.
    • The precise mechanism of orthopyroxene lamellae growth within augite has been a subject of ongoing research.

    Purpose of the Study:

    • To elucidate the growth mechanism of orthopyroxene lamellae exsolved from augite.
    • To investigate the role of diffusion and phase transformation in lamellae formation.

    Main Methods:

    • Analysis of elemental concentration gradients at lamellar interfaces using techniques like electron microprobe analysis.
    • Microstructural examination of exsolved lamellae to identify crystallographic features.

    Main Results:

    • Orthopyroxene lamellae growth occurs via a two-step process: (i) diffusion of calcium and (magnesium, iron) to form clinohypersthene, and (ii) inversion of clinohypersthene to orthopyroxene.

    Related Experiment Videos

  • Incomplete inversion, due to cooling or concentration gradients, results in orthopyroxene with clinohypersthene margins.
  • Measured elemental concentration gradients at (100) interfaces support the proposed two-step growth mechanism.

    • Conclusions:

    • The exsolution of orthopyroxene from augite is a complex process involving both diffusion and solid-state inversion.
    • The presence of clinohypersthene margins is a direct consequence of incomplete inversion during lamellae growth.
    • This study provides a detailed mechanistic understanding of pyroxene exsolution phenomena.