H, C, and N isotopic compositions of Hayabusa category 3 organic samples

Motoo Ito, Masayuki Uesugi, Hiroshi Naraoka, Hikaru Yabuta, Fumio Kitajima, Hajime Mita, Yoshinori Takano, Yuzuru Karouji, Toru Yada, Yukihiro Ishibashi, Tatsuaki Okada, Masanao Abe

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Abstract

Since isotopic ratios of H, C, and N are sensitive indicators for determining extraterrestrial organics, we have measured these isotopes of Hayabusa category 3 organic samples of RB-QD04-0047-02, RA-QD02-0120, and RB-QD04-0001 with ion imaging using a NanoSIMS ion microprobe. All samples have H, C, and N isotopic compositions that are terrestrial within errors (approximately ±50‰ for H, approximately ±9‰ for C, and approximately ±2‰ for N). None of these samples contain micrometer-sized hot spots with anomalous H, C, and N isotopic compositions, unlike previous isotope data for extraterrestrial organic materials, i.e., insoluble organic matters (IOMs) and nano-globules in chondrites, interplanetary dust particles (IDPs), and cometary dust particles. We, therefore, cannot conclude whether these Hayabusa category 3 samples are terrestrial contaminants or extraterrestrial materials because of the H, C, and N isotopic data. A coordinated study using microanalysis techniques including Fourier transform infrared spectrometry (FT-IR), time-of-flight secondary ion mass spectrometry (ToF-SIMS), NanoSIMS ion microprobe, Raman spectroscopy, X-ray absorption near edge spectroscopy (XANES), and transmission electron microscopy/scanning transmission electron microscopy (TEM/STEM) is required to characterize Hayabusa category 3 samples in more detail for exploring their origin and nature.

Original languageEnglish
Article number102
Journalearth, planets and space
Volume66
Issue number1
DOIs
Publication statusPublished - Aug 13 2014

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

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    Ito, M., Uesugi, M., Naraoka, H., Yabuta, H., Kitajima, F., Mita, H., Takano, Y., Karouji, Y., Yada, T., Ishibashi, Y., Okada, T., & Abe, M. (2014). H, C, and N isotopic compositions of Hayabusa category 3 organic samples. earth, planets and space, 66(1), [102]. https://doi.org/10.1186/1880-5981-66-102