Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu

Author:

Nguyen Ann N.1ORCID,Mane Prajkta2ORCID,Keller Lindsay P.1ORCID,Piani Laurette3ORCID,Abe Yoshinari4ORCID,Aléon Jérôme5ORCID,Alexander Conel M. O'D.6ORCID,Amari Sachiko78ORCID,Amelin Yuri9ORCID,Bajo Ken-ichi10ORCID,Bizzarro Martin11ORCID,Bouvier Audrey12ORCID,Carlson Richard W.6ORCID,Chaussidon Marc13ORCID,Choi Byeon-Gak14ORCID,Dauphas Nicolas15ORCID,Davis Andrew M.15ORCID,Di Rocco Tommaso16ORCID,Fujiya Wataru17ORCID,Fukai Ryota18ORCID,Gautam Ikshu19ORCID,Haba Makiko K.19ORCID,Hibiya Yuki20ORCID,Hidaka Hiroshi21ORCID,Homma Hisashi22ORCID,Hoppe Peter23ORCID,Huss Gary R.24ORCID,Ichida Kiyohiro25ORCID,Iizuka Tsuyoshi26ORCID,Ireland Trevor R.27ORCID,Ishikawa Akira19ORCID,Itoh Shoichi28ORCID,Kawasaki Noriyuki10ORCID,Kita Noriko T.29ORCID,Kitajima Kouki29ORCID,Kleine Thorsten30ORCID,Komatani Shintaro25ORCID,Krot Alexander N.24ORCID,Liu Ming-Chang31ORCID,Masuda Yuki19ORCID,McKeegan Kevin D.31ORCID,Morita Mayu25ORCID,Motomura Kazuko32ORCID,Moynier Frédéric13ORCID,Nakai Izumi33ORCID,Nagashima Kazuhide24ORCID,Nesvorný David34ORCID,Nittler Larry635ORCID,Onose Morihiko25ORCID,Pack Andreas16ORCID,Park Changkun36ORCID,Qin Liping37,Russell Sara S.38ORCID,Sakamoto Naoya39ORCID,Schönbächler Maria40ORCID,Tafla Lauren31,Tang Haolan31,Terada Kentaro41ORCID,Terada Yasuko42ORCID,Usui Tomohiro17ORCID,Wada Sohei10ORCID,Wadhwa Meenakshi35ORCID,Walker Richard J.43ORCID,Yamashita Katsuyuki44ORCID,Yin Qing-Zhu45ORCID,Yokoyama Tetsuya19ORCID,Yoneda Shigekazu46ORCID,Young Edward D.31ORCID,Yui Hiroharu47ORCID,Zhang Ai-Cheng48ORCID,Nakamura Tomoki49ORCID,Naraoka Hiroshi50ORCID,Noguchi Takaaki28ORCID,Okazaki Ryuji50ORCID,Sakamoto Kanako18ORCID,Yabuta Hikaru51ORCID,Abe Masanao18ORCID,Miyazaki Akiko18ORCID,Nakato Aiko18ORCID,Nishimura Masahiro18ORCID,Okada Tatsuaki18ORCID,Yada Toru18ORCID,Yogata Kasumi18ORCID,Nakazawa Satoru18ORCID,Saiki Takanao18ORCID,Tanaka Satoshi18ORCID,Terui Fuyuto52ORCID,Tsuda Yuichi18ORCID,Watanabe Sei-ichiro21ORCID,Yoshikawa Makoto18ORCID,Tachibana Shogo53ORCID,Yurimoto Hisayoshi1038ORCID

Affiliation:

1. Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX 77058, USA.

2. Universities Space Research Association, Lunar and Planetary Institute, Houston, TX 77058, USA.

3. Centre de Recherches Pétrographiques et Géochimiques, CNRS - Université de Lorraine, Nancy 54500, France.

4. Graduate School of Engineering Materials Science and Engineering, Tokyo Denki University, Tokyo 120-8551, Japan.

5. Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, Museum National d'Histoire Naturelle, CNRS UMR 7590, IRD, Paris 75005, France.

6. Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC 20015, USA.

7. McDonnell Center for the Space Sciences and Physics Department, Washington University, St. Louis, MO 63130, USA.

8. Geochemical Research Center, The University of Tokyo, Tokyo 113-0033, Japan.

9. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, GD 510640, China.

10. Department of Natural History Sciences, IIL, Hokkaido University, Sapporo 001-0021, Japan.

11. Centre for Star and Planet Formation, GLOBE Institute, University of Copenhagen, Copenhagen K 1350, Denmark.

12. Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth 95447, Germany.

13. Université Paris Cités, Institut de physique du globe de Paris, CNRS, Paris 75005, France.

14. Department of Earth Science Education, Seoul National University, Seoul 08826, Republic of Korea.

15. Department of the Geophysical Sciences and Enrico Fermi Institute, The University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637, USA.

16. Faculty of Geosciences and Geography, University of Göttingen, Göttingen D-37077, Germany.

17. Faculty of Science, Ibaraki University, Mito 310-8512, Japan.

18. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara 252-5210, Japan.

19. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo 152-8551, Japan.

20. General Systems Studies, The University of Tokyo, Tokyo 153-0041, Japan.

21. Earth and Planetary Sciences, Nagoya University, Nagoya 464-8601, Japan.

22. Osaka Application Laboratory, SBUWDX, Rigaku Corporation, Osaka 569-1146, Japan.

23. Max Planck Institute for Chemistry, Mainz 55128, Germany.

24. Hawai‘i Institute of Geophysics and Planetology, University of Hawai‘i at Mānoa, Honolulu, HI 96822, USA.

25. Analytical Technology, Horiba Techno Service Co. Ltd., Kyoto 601-8125, Japan.

26. Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan.

27. School of Earth and Environmental Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia.

28. Earth and Planetary Sciences, Kyoto University, Kyoto 606-8502, Japan.

29. Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, USA.

30. Max Planck Institute for Solar System Research, Göttingen 37077, Germany.

31. Earth, Planetary, and Space Sciences, UCLA, Los Angeles, CA 90095, USA.

32. Thermal Analysis, Rigaku Corporation, Tokyo 196-8666, Japan.

33. Applied Chemistry, Tokyo University of Science, Tokyo 162-8601, Japan.

34. Department of Space Studies, Southwest Research Institute, Boulder, CO 80302, USA.

35. School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85281, USA.

36. Earth System Sciences, Korea Polar Research Institute, Incheon 21990, Korea.

37. CAS Key Laboratory of Crust-Mantle Materials and Environments, University of Science and Technology of China, School of Earth and Space Sciences, Anhui 230026, China.

38. Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK.

39. Isotope Imaging Laboratory, Creative Research Institution, Hokkaido University, Sapporo 001-0021, Japan.

40. Institute for Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, Zurich, Switzerland.

41. Earth and Space Science, Osaka University, Osaka 560-0043, Japan.

42. Spectroscopy and Imaging, Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan.

43. Department of Geology, University of Maryland, College Park, MD 20742, USA.

44. Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan.

45. Earth and Planetary Sciences, University of California, Davis, Davis, CA 95616, USA.

46. Science and Engineering, National Museum of Nature and Science, Tsukuba 305-0005, Japan.

47. Department of Chemistry, Tokyo University of Science, Tokyo 162-8601, Japan.

48. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.

49. Department of Earth Science, Tohoku University, Sendai 980-8578, Japan.

50. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 819-0395, Japan.

51. Earth and Planetary Systems Science Program, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.

52. Kanagawa Institute of Technology, Atsugi 243-0292, Japan.

53. UTokyo Organization for Planetary and Space Science, University of Tokyo, Tokyo 113-0033, Japan.

Abstract

Preliminary analyses of asteroid Ryugu samples show kinship to aqueously altered CI (Ivuna-type) chondrites, suggesting similar origins. We report identification of C-rich, particularly primitive clasts in Ryugu samples that contain preserved presolar silicate grains and exceptional abundances of presolar SiC and isotopically anomalous organic matter. The high presolar silicate abundance (104 ppm) indicates that the clast escaped extensive alteration. The 5 to 10 times higher abundances of presolar SiC (~235 ppm), N-rich organic matter, organics with N isotopic anomalies (1.2%), and organics with C isotopic anomalies (0.2%) in the primitive clasts compared to bulk Ryugu suggest that the clasts formed in a unique part of the protoplanetary disk enriched in presolar materials. These clasts likely represent previously unsampled outer solar system material that accreted onto Ryugu after aqueous alteration ceased, consistent with Ryugu’s rubble pile origin.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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