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 journalArticlepeer-review

3 Citations (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

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

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