Implications for the origins of pure anorthosites found in the feldspathic lunar meteorites, Dhofar 489 group

Hiroshi Nagaoka, Hiroshi Takeda, Yuzuru Karouji, Makiko Ohtake, Akira Yamaguchi, Shigekazu Yoneda, Nobuyuki Hasebe

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    Remote observation by the reflectance spectrometers onboard the Japanese lunar explorer Kaguya (SELENE) showed the purest anorthosite (PAN) spots (>98% plagioclase) at some large craters. Mineralogical and petrologic investigations on the feldspathic lunar meteorites, Dhofar 489 and Dhofar 911, revealed the presence of several pure anorthosite clasts. A comparison with Apollo nearside samples of ferroan anorthosite (FAN) indicated that of the FAN samples returned by the Apollo missions, sample 60015 is the largest anorthosite with the highest plagioclase abundance and homogeneous mafic mineral compositions. These pure anorthosites (>98% plagioclase) have large chemical variations in Mg number (Mg#∈=∈molar 100∈×∈Mg/(Mg∈+∈Fe)) of each coexisting mafic mineral. The variations imply that these pure anorthosites underwent complex formation processes and were not formed by simple flotation of plagioclase. The lunar highland samples with pure anorthosite and the PAN observed by Kaguya suggest that pure anorthosite is widely distributed as lunar crust lithology over the entire Moon.

    元の言語English
    記事番号115
    ジャーナルEarth, Planets and Space
    66
    発行部数1
    DOI
    出版物ステータスPublished - 2014 12 1

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    ASJC Scopus subject areas

    • Geology
    • Space and Planetary Science

    これを引用

    Nagaoka, H., Takeda, H., Karouji, Y., Ohtake, M., Yamaguchi, A., Yoneda, S., & Hasebe, N. (2014). Implications for the origins of pure anorthosites found in the feldspathic lunar meteorites, Dhofar 489 group. Earth, Planets and Space, 66(1), [115]. https://doi.org/10.1186/1880-5981-66-115