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Rare Earth elements in returned lunar samples.

L A Haskin, P A Helmke, R O Allen

    Science (New York, N.Y.)
    |January 30, 1970
    PubMed
    Summary
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    Lunar samples show a correlation between samarium (Sm) and europium (Eu) concentrations, suggesting partial melting of a common source. This indicates specific mineral compositions and melting fractions for lunar magmas.

    Area of Science:

    • Geochemistry
    • Planetary Science
    • Lunar Geology

    Background:

    • Understanding the origin and evolution of lunar magmas is crucial for deciphering the Moon's geological history.
    • Previous studies have analyzed the elemental composition of lunar samples to infer magmatic processes.

    Purpose of the Study:

    • To investigate the relationship between samarium (Sm) and europium (Eu) concentrations in lunar samples.
    • To determine the potential source composition and melting conditions for these lunar samples.

    Main Methods:

    • Analysis of Sm and Sm/Eu ratios in nine lunar samples.
    • Application of partition coefficients from terrestrial systems to model lunar magmatic processes.
    • Evaluation of partial melting and fractional crystallization models.

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    Main Results:

    • A linear correlation was observed between Sm concentrations and Sm/Eu ratios.
    • The data suggests lunar samples originated from equilibrium partial melting of a common source.
    • Melting fraction likely did not exceed 15%, with a source rich in feldspar and mafic minerals.
    • Significant Eu depletions were noted, potentially explained by fractional crystallization with a high Eu(2+)/Eu(3+) ratio.

    Conclusions:

    • The observed elemental correlations support a common source and specific melting conditions for the studied lunar samples.
    • Fractional crystallization offers an alternative explanation for Eu depletions, contingent on lunar magma redox states.