STXM-XANES analyses of Murchison meteorite samples captured by aerogel after hypervelocity impacts: A potential implication of organic matter degradation for micrometeoroid collection experiments

DOI Web Site Web Site 被引用文献8件 参考文献43件
  • Yabuta Hikaru
    Department of Earth and Planetary Systems Science, Hiroshima University
  • Hasegawa Sunao
    Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)
  • Tabata Makoto
    Department of Physics, Chiba University
  • Ito Motoo
    Kochi Institute for Core Sample Research, JAMSTEC
  • Furukawa Yoshihiro
    Department of Earth Science, Tohoku University
  • Nakato Aiko
    Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)
  • Kilcoyne A. L. David
    Advanced Light Source, Lawrence Berkeley National Laboratory
  • Kobayashi Kensei
    Faculty of Engineering, Yokohama National University
  • Yokobori Shin-ichi
    Department of Applied Life Sciences, Tokyo University of Pharmacy and Life Sciences
  • Imai Eiichi
    Nagaoka University of Technology
  • Kawaguchi Yuko
    Department of Applied Life Sciences, Tokyo University of Pharmacy and Life Sciences
  • Yano Hajime
    Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA)
  • Yamagishi Akihiko
    Department of Applied Life Sciences, Tokyo University of Pharmacy and Life Sciences
  • Okudaira Kyoko
    Research Center for Advanced Information Science and Technology, University of Aizu
  • Kebukawa Yoko
    Faculty of Engineering, Yokohama National University

書誌事項

公開日
2019
資源種別
journal article
DOI
  • 10.2343/geochemj.2.0549
公開者
一般社団法人日本地球化学会

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説明

<p>The Tanpopo mission is an astrobiology space experiment at the Japanese Experiment Module (JEM) ‘Kibo’ on the International Space Station (ISS). One of the sub-divided themes of the Tanpopo mission is for the intact capture of organic bearing micrometeoroids in low Earth orbit using ultralow density silica aerogel (0.01 g/cm3). In order to evaluate damage to organic matter in micrometeoroids during hyper velocity impacts into the aerogel, Murchison meteorite powdered samples, analogs of organic bearing micrometeoroids, were fired into flight-grade silica aerogel (0.01 g/cm3) using a two-stage light-gas gun with velocities of 4.4 and 5.9 km/s. The recovered Murchison grains were analyzed using scanning transmission X-ray microscopy/X-ray absorption near edge structure (STXM/XANES), transmission electron microscopy (TEM) and nanoscale secondary ion mass spectrometry (NanoSIMS). TEM observation did not show significant modifications of the recovered Murchison grains. Carbon-XANES spectra, however, showed a large depletion of the organic matter after the 5.9 km/s impact, but no such effects nor any significant hydrogen isotopic fractionation were observed after the 4.4 km/s impact.</p>

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