It is found that Apollo 11 low-K and in particular Apollo 17 mare basalts show a wide range of Th/U ratios unlike other rocks; such variations cannot be explained by near surface crystal fractionation. A two-stage fractional crystallization-partial melting model involving a clinopyroxene cumulate as the major phase can explain the variations in Th/U ratios. Due to the Sm-Nd systematics constraint, several source cumulates are invoked to explain the observed Th/U continuum.


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    Titel :

    Thorium and uranium variations in Apollo 17 basalts, and K-U systematics


    Beteiligte:
    Laul, J. C. (Autor:in) / Fruchter, J. S. (Autor:in)

    Kongress:

    Lunar Science Conference ; 1976 ; Houston, TX


    Erscheinungsdatum :

    01.01.1976


    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch






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    The petrology of the Apollo 17 mare basalts

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    APOLLO 17 Mare Basalts: Serenely Sampling Taurus-Littrow

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