An experimental study on impact-induced alterations of planetary organic simulants

Yasuhito Sekine, Kenya Kodama, Takamichi Kobayashi, Seiji Obata, Yu Chang, Nanako O. Ogawa, Yoshinori Takano, Naohiko Ohkouchi, Koichiro Saiki, Toshimori Sekine

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The present study systematically investigates shock-induced alteration of organic simulants of planetary bodies (OSPBs) as a function of peak shock pressure and temperature by impact experiments. Our results show that the composition and structure of OSPBs are unchanged upon impacts at peak pressures ≤~5 GPa and temperatures ≤~350 °C. On the other hand, these are dramatically changed upon impacts at >7–8 GPa and > ~400 °C, through loss of hydrogen-related bonds and concurrent carbonization, regardless of the initial compositions of OSPBs. Compared with previous results on static heating of organic matter, we suggest that shock-induced alteration cannot be distinguished from static heating only by Raman and infrared spectroscopy. Our experimental results would provide a proxy indicator for assessing degree of shock-induced alteration of organic matter contained in carbonaceous chondrites. We suggest that a remote-sensing signature of the 3.3–3.6 μm absorption due to hydrogen-related bonds on the surface of small bodies would be a promising indicator for the presence of less-thermally-altered (i.e., <350 °C) organic matter there, which will be a target for landing to collect primordial samples in sample-return spacecraft missions, such as Hayabusa2 and OSIRIS-REx.

Original languageEnglish
Pages (from-to)1267-1282
Number of pages16
JournalMeteoritics and Planetary Science
Volume53
Issue number6
DOIs
Publication statusPublished - Jun 2018
Externally publishedYes

Fingerprint

experimental study
shock
organic matter
OSIRIS
hydrogen
heating
carbonaceous chondrite
Raman spectroscopy
hydrogen bonds
infrared spectroscopy
carbonaceous chondrites
carbonization
landing
spacecraft
temperature
remote sensing
signatures
experiment
indicator
loss

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

Cite this

Sekine, Y., Kodama, K., Kobayashi, T., Obata, S., Chang, Y., Ogawa, N. O., ... Sekine, T. (2018). An experimental study on impact-induced alterations of planetary organic simulants. Meteoritics and Planetary Science, 53(6), 1267-1282. https://doi.org/10.1111/maps.13075

An experimental study on impact-induced alterations of planetary organic simulants. / Sekine, Yasuhito; Kodama, Kenya; Kobayashi, Takamichi; Obata, Seiji; Chang, Yu; Ogawa, Nanako O.; Takano, Yoshinori; Ohkouchi, Naohiko; Saiki, Koichiro; Sekine, Toshimori.

In: Meteoritics and Planetary Science, Vol. 53, No. 6, 06.2018, p. 1267-1282.

Research output: Contribution to journalArticle

Sekine, Y, Kodama, K, Kobayashi, T, Obata, S, Chang, Y, Ogawa, NO, Takano, Y, Ohkouchi, N, Saiki, K & Sekine, T 2018, 'An experimental study on impact-induced alterations of planetary organic simulants', Meteoritics and Planetary Science, vol. 53, no. 6, pp. 1267-1282. https://doi.org/10.1111/maps.13075
Sekine, Yasuhito ; Kodama, Kenya ; Kobayashi, Takamichi ; Obata, Seiji ; Chang, Yu ; Ogawa, Nanako O. ; Takano, Yoshinori ; Ohkouchi, Naohiko ; Saiki, Koichiro ; Sekine, Toshimori. / An experimental study on impact-induced alterations of planetary organic simulants. In: Meteoritics and Planetary Science. 2018 ; Vol. 53, No. 6. pp. 1267-1282.
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