In situ investigation of an organic micro‐globule and its mineralogical context within a Ryugu “sand” grain

Author:

Phan Van T. H.1ORCID,Beck Pierre1,Rebois Rolando1,Quirico Eric1,Noguchi Takaaki2ORCID,Matsumoto Toru23,Miyake Akira2,Igami Yohei2,Haruta Mitsutaka4,Saito Hikaru56,Hata Satoshi78,Seto Yusuke9,Miyahara Masaaki10ORCID,Tomioka Naotaka11ORCID,Ishii Hope A.12ORCID,Bradley John P.12,Ohtaki Kenta K.12,Dobrică Elena12ORCID,Leroux Hugues13ORCID,Le Guillou Corentin13,Jacob Damien13,de la Peña Francisco13,Laforet Sylvain13,Marinova Maya14,Langenhorst Falko15,Harries Dennis16ORCID,Abreu Neyda M.17,Gray Jennifer18,Zega Thomas19ORCID,Zanetta Pierre‐M.19,Thompson Michelle S.20,Stroud Rhonda21,Mathurin Jérémie22ORCID,Dazzi Alexandre22,Dartois Emmanuel23,Engrand Cécile24ORCID,Burgess Kate25ORCID,Cymes Brittany A.26ORCID,Bridges John C.27,Hicks Leon2728,Lee Martin R.29ORCID,Daly Luke293031ORCID,Bland Phil A.32,Zolensky Michael E.33ORCID,Frank David R.12,Martinez James34,Tsuchiyama Akira353637,Yasutake Masahiro38,Matsuno Junya35,Okumura Shota2,Mitsukawa Itaru2,Uesugi Kentaro38,Uesugi Masayuki38ORCID,Takeuchi Akihisa38,Sun Mingqi363739,Enju Satomi40,Takigawa Aki41,Michikami Tatsuhiro42,Nakamura Tomoki43,Matsumoto Megumi43,Nakauchi Yusuke44,Abe Masanao4445,Nakazawa Satoru44,Okada Tatsuaki4445,Saiki Takanao44,Tanaka Satoshi4445,Terui Fuyuto46,Yoshikawa Makoto4445,Miyazaki Akiko44,Nakato Aiko44,Nishimura Masahiro44,Usui Tomohiro44,Yada Toru44,Yurimoto Hisayoshi44ORCID,Nagashima Kazuhide12ORCID,Kawasaki Noriyuki47ORCID,Sakamotoa Naoya48,Hoppe Peter49,Okazaki Ryuji50,Yabuta Hikaru10,Naraoka Hiroshi50,Sakamoto Kanako44,Tachibana Shogo51ORCID,Watanabe Sei‐ichiro52,Tsuda Yuichi44

Affiliation:

1. Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) CNRS, Université Grenoble Alpes Grenoble France

2. Division of Earth and Planetary Sciences Kyoto University Kyoto Japan

3. The Hakubi Center for Advanced Research Kyoto University Kyoto Japan

4. Institute for Chemical Research Kyoto University Kyoto Japan

5. Institute for Materials Chemistry and Engineering Kyushu University Fukuoka Japan

6. Pan‐Omics Data‐Driven Research Innovation Center Kyushu University Fukuoka Japan

7. Interdisciplinary Graduate School of Engineering Sciences Kyushu University Fukuoka Japan

8. The Ultramicroscopy Research Center Kyushu University Fukuoka Japan

9. Department of Geosciences Osaka Metropolitan University Osaka Japan

10. Department of Earth and Planetary Systems Science Hiroshima University Hiroshima Japan

11. Kochi Institute for Core Sample Research X‐Star, JAMSTEC Nankoku Japan

12. Hawai‘i Institute of Geophysics and Planetology The University of Hawai‘i at Mānoa Honolulu Hawaii USA

13. CNRS, INRAE, Centrale Lille, UMR 8207‐UMET‐Unité Matériaux et Transformations Université de Lille Lille France

14. CNRS, INRAE, Centrale Lille, Université Artois, FR 2638‐IMEC‐Institut Michel‐Eugène Chevreul Université de Lille Lille France

15. Institut für Geowissenschaften Friedrich‐Schiller‐Universität Jena Jena Germany

16. European Space Resources Innovation Centre Luxembourg Institute of Science and Technology Belvaux Luxembourg

17. NASA Langley Research Center Hampton Virginia USA

18. Materials Characterization Lab The Pennsylvania State University Materials Research Institute University Park Pennsylvania USA

19. Lunar and Planetary Laboratory, Department of Planetary Sciences The University of Arizona Tucson Arizona USA

20. Department of Earth, Atmospheric and Planetary Sciences Purdue University West Lafayette Indiana USA

21. Buseck Center for Meteorite Studies Arizona State University Tempe Arizona USA

22. Institut Chimie Physique CNRS, Univ. Paris‐Saclay Orsay France

23. Institut des Sciences Moléculaires d'Orsay CNRS, Univ. Paris‐Saclay Orsay France

24. IJCLab, UMR 9012 CNRS, Univ. Paris‐Saclay Orsay France

25. Materials Science and Technology Division U.S. Naval Research Laboratory Washington DC USA

26. U.S. Naval Research Laboratory Washington DC USA

27. Space Park Leicester The University of Leicester Leicester UK

28. School of Geology, Geography and the Environment The University of Leicester Leicester UK

29. School of Geographical and Earth Sciences The University of Glasgow Glasgow UK

30. Australian Centre for Microscopy and Microanalysis The University of Sydney Sydney New South Wales Australia

31. Department of Materials The University of Oxford Oxford UK

32. School of Earth and Planetary Sciences Curtin University Perth Western Australia Australia

33. ARES, NASA Johnson Space Center Houston Texas USA

34. Jacobs Engineering Dallas Texas USA

35. Research Organization of Science and Technology Ritsumeikan University Kusatsu Japan

36. CAS Key Laboratory of Mineralogy and Metallogeny, Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry Chinese Academy of Sciences (CAS) Guangzhou China

37. CAS Center for Excellence in Deep Earth Science Guangzhou China

38. Japan Synchrotron Radiation Research Institute Sayo‐gun Japan

39. University of Chinese Academy of Sciences Beijing China

40. Department of Mathematics, Physics, and Earth Science Ehime University Matsuyama Japan

41. Department of Earth and Planetary Science The University of Tokyo Tokyo Japan

42. Faculty of Engineering Kindai University Hiroshima Japan

43. Department of Earth Science Tohoku University Sendai Japan

44. Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Sagamihara Japan

45. The Graduate University for Advanced Studies, SOKENDAI Hayama Japan

46. Department of Mechanical Engineering Kanagawa Institute of Technology Atsugi Japan

47. Department of Earth and Planetary Sciences Hokkaido University Sapporo Japan

48. Creative Research Institution Sousei Hokkaido University Sapporo Japan

49. Nano‐ und Mikropartikelforschung Max Planck Institut für Chemie Mainz Germany

50. Department of Earth and Planetary Sciences Kyushu University Fukuoka Japan

51. UTokyo Organization for Planetary and Space Science The University of Tokyo Tokyo Japan

52. Department of Earth and Environmental Sciences Nagoya University Nagoya Japan

Abstract

AbstractThe Hayabusa2 mission from the Japan Aerospace Exploration Agency (JAXA) returned to the Earth samples of carbonaceous asteroid (162173) Ryugu. This mission offers a unique opportunity to investigate in the laboratory samples from a C‐type asteroid, without physical or chemical alteration by the terrestrial atmosphere. Here, we report on an investigation of the mineralogy and the organo‐chemistry of Hayabusa2 samples using a combination of micro‐ and nano‐infrared spectroscopy. Particles investigated with conventional FTIR spectroscopy have spectra dominated by phyllosilicate‐related absorption, as observed for samples of CI‐chondrites, selected ungrouped carbonaceous chondrites, and selected hydrated micrometeorites. Ryugu samples show smaller sulfate‐related absorption than CI‐chondrites. Our samples that were only briefly exposed to the Earth atmosphere show absorptions related to molecular water, revealing fast terrestrial contamination of the spectral signature at 3 μm. Overall, our FTIR data are in agreement with other work done on Ryugu samples, revealing a low degree of mineralogical variability across Ryugu samples. AFM‐IR mapping of the grains shows the presence of a micrometer‐sized organic globule in one of our analyzed grains. The AFM‐IR spectra obtained on this globule are similar to IR spectra obtained on IOM suggesting that it is constituted of refractory organic matter. This globule may host silicate in its interior, with a different mineralogy than bulk Ryugu phyllosilicate. The shape, presence of peculiar silicate, and the nature of organic constituting the globule point toward a pre‐accretionary origin of this globule and that at least part of Ryugu organics were inherited from the protosolar nebulae or the interstellar media. Altogether, our results show the similarities between Ryugu samples and CI chondrites.

Funder

National Aeronautics and Space Administration

Publisher

Wiley

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