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    The compositions of the lunar crust and upper mantle: Spectral analysis of the inner rings of lunar impact basins

    Access Status
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    Authors
    Lemelin, M.
    Lucey, P.
    Miljkovic, Katarina
    Gaddis, L.
    Hare, T.
    Ohtake, M.
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Lemelin, M. and Lucey, P. and Miljkovic, K. and Gaddis, L. and Hare, T. and Ohtake, M. 2018. The compositions of the lunar crust and upper mantle: Spectral analysis of the inner rings of lunar impact basins. Planetary and Space Science. 165: pp. 230-243.
    Source Title
    Planetary and Space Science
    DOI
    10.1016/j.pss.2018.10.003
    ISSN
    0032-0633
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/71959
    Collection
    • Curtin Research Publications
    Abstract

    The innermost ring in impact basins exposes material originating from various depths, and can be used to study the composition of the lunar crust with depth. In this study, we conduct quantitative mineralogical analyses of the innermost ring in 13 lunar impact basins using reflectance data from the Kaguya Multiband Imager and radiative transfer modeling. We use results from recent hydrocode modeling to calculate the depth of origin of the material exposed by the innermost rings. We find that the most abundant rock type on the innermost ring of most basins is anorthosite. The mafic assemblages are dominated by olivine in some cases, but most often by pyroxene. The impact modeling suggests that the innermost ring material was excavated from a wide range of depths. Here we focus on two mean depths: a crustal component and a mantle component. The crustal component largely dominates the innermost ring material, and the mantle component is present on the innermost ring of 9 of the basins we studied. On these 9 rings, the abundance of low-calcium pyroxene decreases with the proportion of crustal component, suggesting a dominantly mantle origin. However, as we do not detect exposures of ultramafic material, such mantle material is possibly present at the sub-pixel scale (<62 m). This quantitative study reassesses the composition of the lunar crust and upper mantle, which is of great importance for understanding the formation of the Moon.

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