2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 17 - Sep 19, 2022新潟大学 五十嵐キャンパス
2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 17 - Sep 19, 2022新潟大学 五十嵐キャンパス
[R5-07]Petrology and mineralogy of olivine in asteroidal Ryugu samples
*Takashi Mikouchi1, Hideto Yoshida2, Tomoki Nakamura3, Michael E. Zolesnky4, Daisuke Nakashima3, Kenji Hagiya5, Mizuha Kikuiri3, Tomoyo Morita3, Kana Amano3, Eiichi Kagawa2, Hisayoshi Yurimoto6, Takaaki Noguchi7, Ryuji Okazaki8, Hikaru Yabuta9, Hiroshi Naraoka8(1. Univ. Tokyo, 2. Univ. Tokyo, 3. Tohoku Univ., 4. NASA JSC, 5. Univ. Hyogo, 6. Hokkaido Univ., 7. Kyoto Univ., 8. Kyushu Univ., 9. Hiroshima Univ.)
Keywords:
Asteroid Ryugu,Olivine,CI chondrite,FE-EPMA,Hayabusa2 spacecraft
The asteroid Ryugu sample returned by the JAXA Hayabusa2 spacecraft consists mainly of phyllosilicates, but a small amount of olivine (Fo~99), which is thought to have escaped aqueous alteration, is present. CI chondrites (Orugeil and Ivuna) analyzed as a comparison also had olivine texture (texture and size) and mineral compositions identical to those of the Ryugu sample. The absence of olivine in the Room A sample suggests that the two touchdowns yielded samples with different characteristics.