Complex mixture of organic matter in a xenolithic clast from the Zag meteorite revealed by coordinated analyses using AFM-IR, NanoSIMS and STXM/XANES - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Icarus Année : 2023

Complex mixture of organic matter in a xenolithic clast from the Zag meteorite revealed by coordinated analyses using AFM-IR, NanoSIMS and STXM/XANES

Dartois E.
Ferenc Borondics
Ariane Deniset-Besseau
Takaaki Noguchi
  • Fonction : Auteur
Akira Miyake
  • Fonction : Auteur
Yohei Igami
  • Fonction : Auteur
Shohei Yamashita
  • Fonction : Auteur
KEK
Daisuke Wakabayashi
  • Fonction : Auteur
KEK
Yasuo Takeichi
  • Fonction : Auteur
KEK

Résumé

Primitive carbonaceous xenolithic clasts found in sturdy metamorphosed meteorites often provide opportunities to reach labile volatile-rich materials which are easily destroyed during atmospheric entry and materials which we do not have sampled as individual meteorites. Among them, a xenolithic carbonaceous clast in the Zag H3–6 ordinary chondrite has been providing us with the opportunity to analyze a possible sample from D/P-type asteroids. Here we performed a new suite of coordinated analyses of organic matter in the Zag clast using the atomic force microscope infrared spectroscopy (AFM-IR) combined with nanoscale secondary ion mass spectrometer (NanoSIMS), X-ray absorption near-edge spectroscopy (XANES) coupled with scanning transmission X-ray macroscope (STXM), Raman, and (scanning) transmission electron microscopy [(S)TEM] on adjacent ultramicrotomed thin sections from a single sample grain. We successfully demonstrated the practicality of coordinated analyses using AFM-IR, Raman and NanoSIMS on the same sample area, as well as STXM/XANES on adjacent (and nearly identical) thin sections to those used for AFM-IR. The AFM-IR map and STXM maps provided consistent and complementary results. We found that at least two types of organics were closely mixed in this specimen. One was deuterium-rich, CO rich organics with likely smaller aromatic domains, possibly originating in relatively oxidized environments from D-rich precursors. The other type was less deuterium-rich, but aromatic-rich organics, possibly produced in relatively reduced and higher temperature environments with less deuterium-rich precursors. These characteristics point to complex mixtures of materials with different origins and sampling a wide heliocentric range of the Solar System before accretion in the parent body of the clast.
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Dates et versions

hal-04085093 , version 1 (24-10-2023)

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Yoko Kebukawa, Jérémie Mathurin, Dartois E., Ferenc Borondics, Ariane Deniset-Besseau, et al.. Complex mixture of organic matter in a xenolithic clast from the Zag meteorite revealed by coordinated analyses using AFM-IR, NanoSIMS and STXM/XANES. Icarus, 2023, 400, pp.115582. ⟨10.1016/j.icarus.2023.115582⟩. ⟨hal-04085093⟩
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