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    Troctolite 76535: A sample of the Moon's South Pole-Aitken basin?

    Access Status
    Fulltext not available
    Authors
    Garrick-Bethell, I.
    Miljkovic, Katarina
    Hiesinger, H.
    van der Bogert, C.H.
    Laneuville, M.
    Shuster, D.L.
    Korycansky, D.G.
    Date
    2020
    Type
    Journal Article
    
    Metadata
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    Citation
    Garrick-Bethell, I. and Miljkovic, K. and Hiesinger, H. and van der Bogert, C.H. and Laneuville, M. and Shuster, D.L. and Korycansky, D.G. 2020. Troctolite 76535: A sample of the Moon's South Pole-Aitken basin? Icarus. 338: ARTN 113430.
    Source Title
    Icarus
    DOI
    10.1016/j.icarus.2019.113430
    ISSN
    0019-1035
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/90200
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 Elsevier Inc. Lunar samples returned by the Apollo program have provided insights into numerous solar system processes. However, no samples were returned from the lunar farside, where one of the Moon's most geologically important features resides: the 2500-km-diameter South Pole-Aitken basin (SPA). Here, we explore the hypothesis that lunar troctolite 76535 was excavated by SPA. This hypothesis is motivated by the sample's low peak shock pressure (<6 GPa), its substantial depth of origin (45–65 km), and its ancient 40Ar/39Ar age of 4.25 Ga. We use hydrodynamic simulations of crater formation to show that for vertically incident impactors, SPA is the only known basin that can excavate material from the depth and shock pressure range relevant to 76535. The thermal history of 76535 also rules out excavation where a magma ocean was locally present. However, for the vertical impacts modeled, delivery of 76535 to the Apollo 17 site, where it was collected, requires a second impact event that preserved the sample's low shock state. An alternative interpretation of the SPA origin is that 76535 originates from the Serenitatis, Fecunditatis, or Australe basins, if the inferred origin depth of 76535 is in error by ~20 km, or its inferred peak shock pressure is in error by a factor of ~2. These basins could also be candidates for excavating 76535, if oblique impacts yield lower shock pressures of material excavated from the relevant depth. If troctolite 76535 is in fact a sample of SPA, we find that its 4.25 Ga excavation age and the density of large (100–300 km diameter) impact basins within and on the rim of SPA are consistent with the monotonically decaying Neukum (1983) chronology.

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