start-ver=1.4 cd-journal=joma no-vol=98 cd-vols= no-issue=6 article-no= start-page=227 end-page=282 dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=20220610 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective en-subtitle= kn-subtitle= en-abstract= kn-abstract=Presented here are the observations and interpretations from a comprehensive analysis of 16 representative particles returned from the C-type asteroid Ryugu by the Hayabusa2 mission. On average Ryugu particles consist of 50% phyllosilicate matrix, 41% porosity and 9% minor phases, including organic matter. The abundances of 70 elements from the particles are in close agreement with those of CI chondrites. Bulk Ryugu particles show higher 18O, 17O, and 54Cr values than CI chondrites. As such, Ryugu sampled the most primitive and least-thermally processed protosolar nebula reservoirs. Such a finding is consistent with multi-scale H-C-N isotopic compositions that are compatible with an origin for Ryugu organic matter within both the protosolar nebula and the interstellar medium. The analytical data obtained here, suggests that complex soluble organic matter formed during aqueous alteration on the Ryugu progenitor planetesimal (several 10fs of km), <2.6 Myr after CAI formation. 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kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=80 ORCID= en-aut-name=YAMADATetsuya en-aut-sei=YAMADA en-aut-mei=Tetsuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=81 ORCID= en-aut-name=YAMAMOTOYukio en-aut-sei=YAMAMOTO en-aut-mei=Yukio kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=82 ORCID= en-aut-name=YANOHajime en-aut-sei=YANO en-aut-mei=Hajime kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=83 ORCID= en-aut-name=YOKOTAYasuhiro en-aut-sei=YOKOTA en-aut-mei=Yasuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=84 ORCID= en-aut-name=YOSHIHARAKeisuke en-aut-sei=YOSHIHARA en-aut-mei=Keisuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=85 ORCID= en-aut-name=YOSHIKAWAMakoto en-aut-sei=YOSHIKAWA en-aut-mei=Makoto kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=86 ORCID= en-aut-name=YOSHIKAWAKent en-aut-sei=YOSHIKAWA en-aut-mei=Kent kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=87 ORCID= en-aut-name=FUJIMOTOMasaki en-aut-sei=FUJIMOTO en-aut-mei=Masaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=88 ORCID= en-aut-name=WATANABESei-ichiro en-aut-sei=WATANABE en-aut-mei=Sei-ichiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=89 ORCID= en-aut-name=TSUDAYuichi en-aut-sei=TSUDA en-aut-mei=Yuichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=90 ORCID= affil-num=1 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=2 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=3 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=4 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=5 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=6 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=7 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=8 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=9 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=10 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=11 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=12 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=13 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=14 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=15 en-affil=The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Planetary Materials, Okayama University kn-affil= affil-num=16 en-affil=Department of Information and Basic Science, Nagoya City University kn-affil= affil-num=17 en-affil=The Graduate University for Advanced Studies (SOKENDAI) kn-affil= affil-num=18 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=19 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=20 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=21 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=22 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=23 en-affil=Marine Works Japan, Ltd. kn-affil= affil-num=24 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=25 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=26 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=27 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=28 en-affil=Marine Works Japan, Ltd. kn-affil= affil-num=29 en-affil=Graduate School of Science, The University of Tokyo kn-affil= affil-num=30 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=31 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=32 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=33 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=34 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=35 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=36 en-affil=Graduate School of Science, Kobe University kn-affil= affil-num=37 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=38 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=39 en-affil=Graduate School of Science, Kobe University kn-affil= affil-num=40 en-affil=Faculty of Computer Science and Engineering, The University of Aizu kn-affil= affil-num=41 en-affil=Faculty of Science and Technology, Kochi University kn-affil= affil-num=42 en-affil=Faculty of Computer Science and Engineering, The University of Aizu kn-affil= affil-num=43 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=44 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=45 en-affil=Research and Development Directorate, JAXA kn-affil= affil-num=46 en-affil=Department of Physics and Astronomy, Seoul National University kn-affil= affil-num=47 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=48 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=49 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=50 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=51 en-affil=Faculty of Computer Science and Engineering, The University of Aizu kn-affil= affil-num=52 en-affil=National Astronomical Observatory of Japan kn-affil= affil-num=53 en-affil=Observatoire de Paris kn-affil= affil-num=54 en-affil=Faculty of Engineering, Kindai University kn-affil= affil-num=55 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=56 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=57 en-affil=Graduate School of Environmental Studies, Nagoya University kn-affil= affil-num=58 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=59 en-affil=National Astronomical Observatory of Japan kn-affil= affil-num=60 en-affil=National Astronomical Observatory of Japan kn-affil= affil-num=61 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=62 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=63 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=64 en-affil=Graduate School of Science, Kobe University kn-affil= affil-num=65 en-affil=Research and Development Directorate, JAXA kn-affil= affil-num=66 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=67 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=68 en-affil=College of Science, Rikkyo University kn-affil= affil-num=69 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=70 en-affil=Planetary Exploration Research Center (PERC), Chiba Institute of Technology kn-affil= affil-num=71 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=72 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=73 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=74 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=75 en-affil=The Graduate University for Advanced Studies (SOKENDAI) kn-affil= affil-num=76 en-affil=Graduate School of Science, The University of Tokyo kn-affil= affil-num=77 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=78 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=79 en-affil=Planetary Exploration Research Center (PERC), Chiba Institute of Technology kn-affil= affil-num=80 en-affil=Planetary Exploration Research Center (PERC), Chiba Institute of Technology kn-affil= affil-num=81 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=82 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=83 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=84 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=85 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=86 en-affil=The Graduate University for Advanced Studies (SOKENDAI) kn-affil= affil-num=87 en-affil=Research and Development Directorate, JAXA kn-affil= affil-num=88 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= affil-num=89 en-affil=Graduate School of Environmental Studies, Nagoya University kn-affil= affil-num=90 en-affil=Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency kn-affil= END