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Electron microscopy observations of the diversity of Ryugu organic matter and its relationship to minerals at the micro‐ to nano‐scale

2024; Wiley; Volume: 59; Issue: 8 Linguagem: Inglês

10.1111/maps.14128

1945-5100

R. M. Stroud, Jens Barosch, L. Bonal, Katherine Burgess, George D. Cody, B. T. De Gregorio, Luke Daly, E. Dartois, E. Dobricǎ, J. Duprat, C. Engrand, Dennis Harries, Minako Hashiguchi, H. A. Ishii, Yoko Kebukawa, A. David Kilcoyne, F. Langenhorst, Martin Lee, L. R. Nittler, É. Quirico, Taiga Okumura, Laurent Rémusat, Scott A. Sandford, Hikaru Yabuta, Masanao Abe, N. M. Abreu, Paul A.J. Bagot, Pierre Beck, Laure Bejach, P. A. Bland, J. C. Bridges, Brittany A. Cymes, Alexandre Dazzi, Francisco de la Peña, Ariane Deniset‐Besseau, Satomi Enju, Yuma Enokido, D. Frank, Jennifer L. Gray, Mitsutaka Haruta, Satoshi Hata, L. J. Hicks, Yohei Igami, Damien Jacob, Kanami Kamide, M. Komatsu, Sylvain Laforet, Hugues Leroux, Corentin Le Guillou, Zita Martins, Maya Marinova, James Martinez, Jérémie Mathurin, Megumi Matsumoto, Toru Matsumoto, Junya Matsuno, Samuel McFadzean, Tatsuhiro Michikami, Itaru Mitsukawa, Akira Miyake, Masaaki Miyahara, Akiko Miyazaki, Gilles Montagnac, S. Mostefaoui, Tomoki Nakamura, Aiko Nakato, Hiroshi Naraoka, Yusuke Nakauchi, Satoru Nakazawa, Masahiro Nishimura, T. Noguchi, Kenta K. Ohtaki, Takuji Ohigashi, Tatsuaki Okada, Shota Okumura, Ryuji Okazaki, Van T. H. Phan, Rolando Rebois, Kanako Sakamoto, Takanao Saiki, Hikaru Saito, Yusuke Seto, Miho Shigenaka, William Smith, Hiroki Suga, Mingqi Sun, Shogo Tachibana, Yoshio Takahashi, Yasuo Takeichi, Akihisa Takeuchi, Aki Takigawa, Y. Tamenori, Satoshi Tanaka, Fuyuto Terui, M. S. Thompson, Naotaka Tomioka, A. Tsuchiyama, Yuichi Tsuda, Kentaro Uesugi, Masayuki Uesugi, Tomohiro Usui, Maximilien Verdier‐Paoletti, Daisuke Wakabayashi, Sei‐ichiro Watanabe, Toru Yada, Shohei Yamashita, Masahiro Yasutake, Kasumi Yogata, Makoto Yoshikawa, Hisayoshi Yurimoto, Pierre-Marie Zanetta, T. J. Zega, M. E. Zolensky,

Astrophysics and Star Formation Studies

Abstract Transmission electron microscopy analyses of Hayabusa2 samples show that Ryugu organic matter exhibits a range of morphologies, elemental compositions, and carbon functional chemistries consistent with those of carbonaceous chondrites that have experienced low‐temperature aqueous alteration. Both nanoglobules and diffuse organic matter are abundant. Non‐globular organic particles are also present, and including some that contain nanodiamond clusters. Diffuse organic matter is finely distributed in and around phyllosilicates, forms coatings on other minerals, and is also preserved in vesicles in secondary minerals such as carbonate and pyrrhotite. The average elemental compositions determined by energy‐dispersive spectroscopy of extracted, demineralized insoluble organic matter samples A0107 and C0106 are C 100 N 3 O 9 S 1 and C 100 N 3 O 7 S 1 , respectively, with the difference in O/C slightly outside the difference in the standard error of the mean. The functional chemistry of the nanoglobules varies from mostly aromatic C=C to mixtures of aromatic C=C, ketone C=O, aliphatic (CH n ), and carboxyl (COOH) groups. Diffuse organic matter associated with phyllosilicates has variable aromatic C, ketone and carboxyl groups, and some localized aliphatics, but is dominated by molecular carbonate (CO 3 ) absorption, comparable to prior observations of clay‐bound organic matter in CI meteorites.