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

Stroud, R. M. et al. (2024) Electron microscopy observations of the diversity of Ryugu organic matter and its relationship to minerals at the micro- to nano-scale. Meteoritics and Planetary Science, (doi: 10.1111/maps.14128) (Early Online Publication)

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 C100N3O9S1 and C100N3O7S1, 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 (CHn), 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 (CO3) absorption, comparable to prior observations of clay-bound organic matter in CI meteorites.

• Item Type: Articles
• Additional Information: RMS acknowledges funding from NASA LARS Award 80NSSC23K0424. This research used beamline 5.3.2.2 of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. JSPS KAKENHI grant numbers to TN related to this study are JP19H00725, JP19KK0094, and JP21H05424.
• Status: Early Online Publication
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Lee, Professor Martin and Daly, Dr Luke and McFadzean, Dr Sam
• Authors: Stroud, R. M., Barosch, J., Bonal, L., Burgess, K., Cody, G. D., De Gregorio, B. T., Daly, L., Dartois, E., Dobrică, E., Duprat, J., Engrand, C., Harries, D., Hashiguchi, M., Ishii, H., Kebukawa, Y., Kilcoyne, A. D., Langenhorst, F., Lee, M. R., Nittler, L. R., Quirico, E., Okumura, T., Remusat, L., Sandford, S., Yabuta, H., Abe, M., Abreu, N. M., Bagot, P. A. J., Beck, P., Bejach, L., Bland, P. A., Bridges, J. C., Cymes, B. A., Dazzi, A., de la Peña, F., Deniset-Besseau, A., Enju, S., Enokido, Y., Frank, D. R., Gray, J., Haruta, M., Hata, S., Hicks, L., Igami, Y., Jacob, D., Kamide, K., Komatsu, M., Laforet, S., Leroux, H., Le Guillou, C., Martins, Z., Marinova, M., Martinez, J., Mathurin, J., Matsumoto, M., Matsumoto, T., Matsuno, J., McFadzean, S., Michikami, T., Mitsukawa, I., Miyake, A., Miyahara, M., Miyazaki, A., Montagnac, G., Mostefaoui, S., Nakamura, T., Nakato, A., Naraoka, H., Nakauchi, Y., Nakazawa, S., Nishimura, M., Noguchi, T., Ohtaki, K., Ohigashi, T., Okada, T., Okumura, S., Okazaki, R., Phan, T. H. V., Rebois, R., Sakamoto, K., Saiki, T., Saito, H., Seto, Y., Shigenaka, M., Smith, W., Suga, H., Sun, M., Tachibana, S., Takahashi, Y., Takeichi, Y., Takeuchi, A., Takigawa, A., Tamenori, Y., Tanaka, S., Terui, F., Thompson, M. S., Tomioka, N., Tsuchiyama, A., Tsuda, Y., Uesugi, K., Uesugi, M., Usui, T., Verdier-Paoletti, M., Wakabayashi, D., Watanabe, S.-i., Yada, T., Yamashita, S., Yasutake, M., Yogata, K., Yoshikawa, M., Yurimoto, H., Zanetta, P.-M., Zega, T., and Zolensky, M. E.
• College/School: College of Science and Engineering > School of Geographical and Earth Sciences; College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Meteoritics and Planetary Science
• Publisher: Wiley
• ISSN: 1086-9379
• ISSN (Online): 1945-5100
• Published Online: 25 January 2024
• Copyright Holders: Copyright © 2024 The Authors
• First Published: First published in Meteoritics and Planetary Science 2024
• Publisher Policy: Reproduced under a Creative Commons licence