Noguchi, T. et al. (2023) Mineralogy and petrology of fine‐grained samples recovered from the asteroid (162173) Ryugu. Meteoritics and Planetary Science, (doi: 10.1111/maps.14093) (Early Online Publication)
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Abstract
Samples returned from the carbonaceous asteroid (162173) Ryugu by the Hayabusa2 mission revealed that Ryugu is composed of materials consistent with CI chondrites and some types of space weathering. We report detailed mineralogy of the fine-grained Ryugu samples allocated to our “Sand” team and report additional space weathering features found on the grains. The dominant mineralogy is composed of a fine-grained mixture of Mg-rich saponite and serpentine, magnetite, pyrrhotite, pentlandite, dolomite, and Fe-bearing magnesite. These grains have mineralogy comparable to that of CI chondrites, showing severe aqueous alteration but lacking ferrihydrite and sulfate. These results are similar to previous works on large Ryugu grains. In addition to the major minerals, we also find many minerals that are rare or have not been reported among CI chondrites. Accessory minerals identified are hydroxyapatite, Mg-Na phosphate, olivine, low-Ca pyroxene, Mg-Al spinel, chromite, manganochromite, eskolaite, ilmenite, cubanite, polydymite, transjordanite, schreibersite, calcite, moissanite, and poorly crystalline phyllosilicate. We also show scanning transmission electron microscope and scanning electron microscope compositional maps and images of some space-weathered grains and severely heated and melted grains. Although our mineralogical results are consistent with that of millimeter-sized grains, the fine-grained fraction is best suited to investigate impact-induced space weathering.
| Item Type: | Articles |
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| Additional Information: | The Hayabusa2 project has been developed and led by JAXA in collaboration with Deutsches Zentrum für Luft- und Raumfahrt (DLR) and Centre national d'études spatiales (CNES), and supported by NASA and Australian Space Agency (ASA). We thank all of the members of the Hayabusa2 project for their technical and scientific contributions. TEM works at Kyushu University was supported by the Advanced Characterization Platform of the Nanotechnology Platform Japan (grant number JPMXP09A21KU0393) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. The SR-CT at SPring-8 was conducted under the proposals 2021A0166, 2021A0602, and 2021B0188. SR experiments at SPring-8 are supported by RIKEN. Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. PB, HVP, and RR acknowledge the Centre National d'Etude Spatiale (CNES). MZ was supported by NASA's Hayabusa2 Mission Participating Scientist Program. HAI and JPB were supported by NASA's Laboratory Analysis of Returned Samples Program. HL, CLG, DJ, FDLP, and MM acknowledge the advanced characterization platform, University of Lille–CNRS. JSPS KAKENHI Grant Numbers related to this study are JP19H00725, JP19KK0094, JP21H05424, JP20H01965, JP20H00198, JP20H00205, JP15H05695, 16H06348, and 20H00188. UK Science and Technology Facilities Council (STFC) grant numbers related to this study are ST/T002328/1 and ST/S000429/1. Start-up funds from Purdue University, University of Glasgow COVID-19 Researcher Support Scheme (LD) ISITE ULNE, Métropole Européenne de Lille, the region “Hauts-de-France” and the ERDF program of the European Union, European Research Council (ERC) under grant agreement number 771691 (Solarys) are also used for this study. AT was supported by the Chinese Academy of Sciences' Presidentʼs International Fellowship Initiative, grant no. 2019VCA0004. |
| Status: | Early Online Publication |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | McFadzean, Dr Sam and Lee, Professor Martin |
| Authors: | Noguchi, T., Matsumoto, T., Miyake, A., Igami, Y., Haruta, M., Saito, H., Hata, S., Seto, Y., Miyahara, M., Tomioka, N., Ishii, H. A., Bradley, J. P., Ohtaki, K. K., Dobrică, E., Leroux, H., Guillou, C. L., Jacob, D., de la Peña, F., Laforet, S., Mouloud, B.‐E., Marinova, M., Langenhorst, F., Harries, D., Beck, P., Phan, T. H. V., Rebois, R., Abreu, N. M., Gray, J., Zega, T., Zanetta, P.‐M., Thompson, M. S., Stroud, R., Burgess, K., Cymes, B. A., Bridges, J. C., Hicks, L., Lee, M. R., Daly, L., Bland, P. A., Smith, W. A., McFadzean, S., Martin, P.‐E., Bagot, P. A. J., Fougerouse, D., Saxey, D. W., Reddy, S., Rickard, W. D. A., Zolensky, M. E., Frank, D. R., Martinez, J., Tsuchiyama, A., Yasutake, M., Matsuno, J., Okumura, S., Mitsukawa, I., Uesugi, K., Uesugi, M., Takeuchi, A., Sun, M., Enju, S., Takigawa, A., Michikami, T., Nakamura, T., Matsumoto, M., Nakauchi, Y., Abe, M., Nakazawa, S., Okada, T., Saiki, T., Tanaka, S., Terui, F., Yoshikawa, M., Miyazaki, A., Nakato, A., Nishimura, M., Usui, T., Yada, T., Yurimoto, H., Nagashima, K., Kawasaki, N., Sakamotoa, N., Hoppe, P., Okazaki, R., Yabuta, H., Naraoka, H., Sakamoto, K., Tachibana, S., Watanabe, S.‐i., and Tsuda, Y. |
| 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: | 22 November 2023 |
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