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Electron microprobe analysis of lunar samples.

I Adler, L S Walter, P D Lowman

    Science (New York, N.Y.)
    |January 30, 1970
    PubMed
    Summary
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    Analysis of crystalline rock reveals variable clinopyroxene and homogeneous plagioclase, with accessory minerals like apatite. Lunar soil spherules resemble crystalline rocks, suggesting formation via rapid cooling and meteoritic impact.

    Area of Science:

    • Mineralogy and Petrology
    • Geochemistry
    • Lunar Science

    Background:

    • Crystalline rocks and lunar soil are key to understanding planetary formation.
    • Detailed mineralogical analysis provides insights into geological processes.

    Purpose of the Study:

    • To analyze the mineral composition of a type A crystalline rock and associated lunar soil.
    • To determine the formation conditions and processes of the analyzed samples.

    Main Methods:

    • Analysis of plagioclase feldspar, clinopyroxene, and ilmenite in a polished thin section.
    • Chemical analysis of accessory minerals (apatite, troilite, metallic iron).
    • Compositional comparison between crystalline rock and lunar soil spherules.

    Main Results:

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    • Clinopyroxene showed compositional variability (high and low Ca phases); plagioclase was homogeneous.
    • Ilmenite was chemically homogeneous, with minor chromium-rich areas.
    • Accessory minerals included apatite (with rare earth elements), troilite, and iron.
    • Lunar soil spherules largely matched crystalline rock compositions, with some monomineralic exceptions.
    • The crystalline rock likely formed from rapid cooling of a silicate melt under low oxygen conditions.
    • Meteoritic impact is suggested as the formation mechanism for many soil components.

    Conclusions:

    • The crystalline rock's formation involved rapid cooling and low oxygen partial pressure.
    • Lunar soil components are primarily products of meteoritic impact.
    • Mineralogical data provides crucial evidence for understanding lunar geological history.