太陽系科学研究系

春山 純一

ハルヤマ ジュンイチ  (Junichi Haruyama)

基本情報

所属
国立研究開発法人宇宙航空研究開発機構 宇宙科学研究所

研究者番号
40373443
J-GLOBAL ID
202001002664981989
researchmap会員ID
R000013965

受賞

 4

論文

 93
  • Dehua Wang, John R. Elliott, Gang Zheng, Tim J. Wright, Andrew R. Watson, Jack D. McGrath
    Earth and Planetary Science Letters 644 118919-118919 2024年10月  査読有り
  • Marcin Chwała, Goro Komatsu, Junichi Haruyama
    Icarus 411 115928-115928 2024年3月  査読有り
  • Junichi Haruyama
    Journal of Evolving Space Activities 1(108) 2023年12月  査読有り筆頭著者
  • Satoru Yamamoto, Hiroshi Nagaoka, Makiko Ohtake, Masahiro Kayama, Yuzuru Karouji, Yoshiaki Ishihara, Junichi Haruyama
    Journal of Geophysical Research: Planets 128(5) 2023年5月  査読有り
    We studied the lunar mantle composition based on the characteristics of low-Ca pyroxene (LCP)-rich and olivine-rich rocks exposed on the lunar surface. Using data mining with SELENE (Kaguya) hyperspectral data, we found 531 sites with spectra dominated by an ultramafic LCP end-member mineral, most of which are located in the Imbrium basin and the South Pole-Aitken (SPA) basin. Stratigraphic analysis of each site revealed that LCP-rich rock bodies are exposed on fresh geological features that are less affected by space-weathering, such as steep slopes at peaks, and crater walls and ejecta deposits at smaller craters. We also found that, in the SPA and Imbrium basins, LCP-rich bodies are more numerous and more widely distributed than olivine-rich rocks, suggesting that LCP-rich materials deep in the mantle were excavated during the formation of these huge basins. However, olivine-rich rocks were abundant, and no LCP-rich rocks were found in the Moscoviense, Crisium, and Humboldtianum basins, which are known to have almost-zero crustal thicknesses, indicative of mantle excavation. Thus, our results suggest that the composition of rocks derived from the lunar mantle varies with the impact basin. Such a difference might indicate a layered structure of mantle composition, with the olivine-rich upper mantle overlying the LCP-rich mantle, a horizontal heterogeneity in the mantle composition, a regional heterogeneity in early lunar basaltic magmatism, or an impact melt origin. The layered structure or horizontal heterogeneity might have resulted from a mantle overturn caused by gravitational instability in the early stages of the lunar magma ocean.
  • Junichi Haruyama, Kazuki Kariya, Yuji Katsumata, Masaru Koga, Naoki Sato, Seiichi Hara
    Journal of Evolving Space Activities 1 2022年12月  査読有り筆頭著者

MISC

 424

書籍等出版物

 1

講演・口頭発表等

 49

共同研究・競争的資金等の研究課題

 4