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The First Returned Samples From A C-Type Asteroid Show Kinship to the Chemically Most Primitive MeteoritesBulk chemical and isotopic compositions, and mineralogy in the asteroid (162173) Ryugu
samples show that Ryugu is mainly composed of materials related to the CI (Ivuna-like)
carbonaceous chondrite group. The samples consist predominantly of minerals produced by
aqueous alteration in a parent planetesimal from which Ryugu was derived. The 53Mn-53Cr
systematics of dolomite suggest that this alteration occurred 5.2 (+0.7/–0.8) million years after
formation of Ca-Al-rich inclusions, the first solids formed in the Solar System. The aqueous
alteration temperature at the time dolomite and magnetite coprecipitated was 37±10°C. Unlike in CI chondrites, phyllosilicates in Ryugu have lost most of their interlayer water, but retained
structural water. This indicates that following aqueous alteration the Ryugu samples avoided
heating above ~90°C.
Document ID
20220009715
Acquisition Source
Johnson Space Center
Document Type
Accepted Manuscript (Version with final changes)
Authors
Tetsuya Yokoyama ORCID(Tokyo Institute of Technology Tokyo, Tôkyô, Japan)
Kazuhide Nagashima ORCID(University of Hawaii at Manoa Honolulu, Hawaii, United States)
Izumi Nakai ORCID(Tokyo University of Science Tokyo, Japan)
Edward D. Young ORCID(University of California, Los Angeles Los Angeles, California, United States)
Yoshinari Abe ORCID(Tokyo Denki University Tokyo, Japan)
Jérôme Aléon ORCID(Institute of Mineralogy, Materials Physics and Cosmochemistry Paris, France)
Conel M. O'D. Alexander ORCID(Carnegie Institution for Science Washington D.C., District of Columbia, United States)
Sachiko Amari ORCID(Washington University in St. Louis St Louis, Missouri, United States)
Yuri Amelin ORCID(Guangzhou Institute of Geochemistry Guangzhou, China)
Ken-ichi Bajo ORCID(Hokkaido University Sapporo, Hokkaidô, Japan)
Martin Bizzarro ORCID(University of Copenhagen Copenhagen, Denmark)
Audrey Bouvier ORCID(University of Bayreuth Bayreuth, Bayern, Germany)
Richard W. Carlson ORCID(Carnegie Institution for Science Washington D.C., District of Columbia, United States)
Marc Chaussidon ORCID(Institut De Physique Du Globe De Paris Paris, France)
Byeon-Gak Choi ORCID(Seoul National University Seoul, South Korea)
Nicolas Dauphas ORCID(University of Chicago Chicago, Illinois, United States)
Andrew M. Davis ORCID(University of Chicago Chicago, Illinois, United States)
Tommaso Di Rocco ORCID(University of Göttingen Göttingen, Germany)
Wataru Fujiya ORCID(Ibaraki University Ibaraki, Japan)
Ryota Fukai ORCID(Japan Aerospace Exploration Agency Tokyo, Japan)
Ikshu Gautam ORCID(Tokyo Institute of Technology Tokyo, Tôkyô, Japan)
Makiko K. Haba ORCID(Tokyo Institute of Technology Tokyo, Tôkyô, Japan)
Yuki Hibiya ORCID(University of Tokyo Tokyo, Japan)
Hiroshi Hidaka ORCID(Nagoya University Nagoya, Japan)
Hisashi Homma ORCID(Rigaku (Japan) Tokyo, Tôkyô, Japan)
Peter Hoppe ORCID(Max Planck Institute for Chemistry Mainz, Germany)
Gary R. Huss ORCID(University of Hawaii at Manoa Honolulu, Hawaii, United States)
Kiyohiro Ichida ORCID(Horiba (Japan) Aso, Japan)
Tsuyoshi Iizuka ORCID(University of Tokyo Tokyo, Japan)
Trevor R. Ireland ORCID(University of Queensland Brisbane, Queensland, Australia)
Akira Ishikawa ORCID(Tokyo Institute of Technology Tokyo, Tôkyô, Japan)
Motoo Ito ORCID(Japan Agency for Marine-Earth Science and Technology Yokosuka, Japan)
Shoichi Itoh ORCID(Kyoto University Kyoto, Japan)
Noriyuki Kawasaki ORCID(Hokkaido University Sapporo, Hokkaidô, Japan)
Noriko T. Kita ORCID(University of Wisconsin–Madison Madison, Wisconsin, United States)
Kouki Kitajima ORCID(University of Wisconsin–Madison Madison, Wisconsin, United States)
Thorsten Kleine ORCID(Max Planck Institute for Solar System Research Göttingen, Germany)
Shintaro Komatani ORCID(Horiba (Japan) Aso, Japan)
Ann Nguyen ORCID(Johnson Space Center Houston, Texas, United States)
Date Acquired
June 23, 2022
Publication Date
June 9, 2022
Publication Information
Publication: Science
Publisher: American Association for the Advancement of Science
Volume: 379
Issue: 6634
Issue Publication Date: February 24, 2023
ISSN: 0036-8075
e-ISSN: 1095-9203
DOI: 10.1126/science.abn7850
Subject Category
Chemistry And Materials (General)
Space Sciences (General)
Funding Number(s)
WBS: 191589.04.02.01.08
Distribution Limits
Public
Copyright
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