Three-dimensional microstructure of samples recovered from asteroid 25143 Itokawa: Comparison with LL5 and LL6 chondrite particles

Akira Tsuchiyama, Masayuki Uesugi, Kentaro Uesugi, Tsukasa Nakano, Ryo Noguchi, Toru Matsumoto, Junya Matsuno, Takashi Nagano, Yuta Imai, Akira Shimada, Akihisa Takeuchi, Yoshio Suzuki, Tomoki Nakamura, Takaaki Noguchi, Masanao Abe, Toru Yada, Akio Fujimura

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

In this study, the three-dimensional (3-D) microstructure of 48 Itokawa regolith particles was examined by synchrotron microtomography at SPring-8 during the preliminary examination of Hayabusa samples. Moreover, the 3-D microstructure of particles collected from two LL6 chondrites (Ensisheim and Kilabo meteorites) and an LL5 chondrite (Tuxtuac meteorite) was investigated by the same method for comparison. The modal abundances of minerals, especially olivine, bulk density, porosity, and grain size are similar in all samples, including voids and cracks. These results show that the Itokawa particles, which are surface materials from the S-type asteroid Itokawa, are consistent with the LL chondrite materials in terms of not only elemental and isotopic composition of the minerals but also 3-D microstructure. However, we could not determine whether the Itokawa particles are purely LL5, LL6, or a mixture of the two. No difference between the particles collected from Rooms A and B of the sample chamber, corresponding to the sampling sequence of the spacecraft's second and first touchdowns, respectively, was detected because of the statistically small amount of particles from Room B.

Original languageEnglish
Pages (from-to)172-187
Number of pages16
JournalMeteoritics and Planetary Science
Volume49
Issue number2
DOIs
Publication statusPublished - 2014 Feb

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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    Tsuchiyama, A., Uesugi, M., Uesugi, K., Nakano, T., Noguchi, R., Matsumoto, T., Matsuno, J., Nagano, T., Imai, Y., Shimada, A., Takeuchi, A., Suzuki, Y., Nakamura, T., Noguchi, T., Abe, M., Yada, T., & Fujimura, A. (2014). Three-dimensional microstructure of samples recovered from asteroid 25143 Itokawa: Comparison with LL5 and LL6 chondrite particles. Meteoritics and Planetary Science, 49(2), 172-187. https://doi.org/10.1111/maps.12177