Lunar farside Th distribution measured by Kaguya gamma-ray spectrometer

Shingo Kobayashi*, Yuzuru Karouji, Tomokatsu Morota, Hiroshi Takeda, Nobuyuki Hasebe, Makoto Hareyama, Masanori Kobayashi, Eido Shibamura, Naoyuki Yamashita, Claude d'Uston, Olivier Gasnault, Olivier Forni, Robert C. Reedy, Kyeong Ja Kim, Yoshiaki Ishihara

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    23 Citations (Scopus)


    Kaguya gamma-ray spectrometer measured thorium (Th) distribution on the lunar farside with the highest sensitivity among past gamma-ray remote sensing missions. The newly obtained Th map has revealed that two regions near the equator on the farside have the lowest Th abundances. We found that the variation of the Th abundance perfectly correlates with the crustal thickness in the farside and the southern nearside, and it could be a result of the crystallization of the lunar magma ocean.

    Original languageEnglish
    Pages (from-to)10-16
    Number of pages7
    JournalEarth and Planetary Science Letters
    Publication statusPublished - 2012 Jul 1


    • Imbrium ejecta
    • Lunar crust
    • Lunar magma ocean
    • SELENE (Kaguya) gamma-ray spectrometer
    • Thorium

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geophysics
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science


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