Proceedings of the Japan Academy, Series B
Online ISSN : 1349-2896
Print ISSN : 0386-2208
ISSN-L : 0386-2208
Original Article
On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective
Eizo NAKAMURA Katsura KOBAYASHIRyoji TANAKATak KUNIHIROHiroshi KITAGAWAChristian POTISZILTsutomu OTAChie SAKAGUCHIMasahiro YAMANAKADilan M. RATNAYAKEHavishk TRIPATHIRahul KUMARMaya-Liliana AVRAMESCUHidehisa TSUCHIDAYusuke YACHIHitoshi MIURAMasanao ABERyota FUKAIShizuho FURUYAKentaro HATAKEDATasuku HAYASHIYuya HITOMIKazuya KUMAGAIAkiko MIYAZAKIAiko NAKATOMasahiro NISHIMURATatsuaki OKADAHiromichi SOEJIMASeiji SUGITAAyako SUZUKITomohiro USUIToru YADADaiki YAMAMOTOKasumi YOGATAMiwa YOSHITAKEMasahiko ARAKAWAAtsushi FUJIIMasahiko HAYAKAWANaoyuki HIRATANaru HIRATARie HONDAChikatoshi HONDASatoshi HOSODAYu-ichi IIJIMAHitoshi IKEDAMasateru ISHIGUROYoshiaki ISHIHARATakahiro IWATAKosuke KAWAHARAShota KIKUCHIKohei KITAZATOKoji MATSUMOTOMoe MATSUOKATatsuhiro MICHIKAMIYuya MIMASUAkira MIURATomokatsu MOROTASatoru NAKAZAWANoriyuki NAMIKIHirotomo NODARina NOGUCHINaoko OGAWAKazunori OGAWAChisato OKAMOTOGo ONOMasanobu OZAKITakanao SAIKINaoya SAKATANIHirotaka SAWADAHiroki SENSHUYuri SHIMAKIKei SHIRAIYuto TAKEIHiroshi TAKEUCHISatoshi TANAKAEri TATSUMIFuyuto TERUIRyudo TSUKIZAKIKoji WADAManabu YAMADATetsuya YAMADAYukio YAMAMOTOHajime YANOYasuhiro YOKOTAKeisuke YOSHIHARAMakoto YOSHIKAWAKent YOSHIKAWAMasaki FUJIMOTOSei-ichiro WATANABEYuichi TSUDA
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Supplementary material

2022 Volume 98 Issue 6 Pages 227-282

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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 δ18O, Δ17O, and ε54Cr 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 10’s of km), <2.6 Myr after CAI formation. Subsequently, the Ryugu progenitor planetesimal was fragmented and evolved into the current asteroid Ryugu through sublimation.

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© 2022 The Author(s).

Published under the terms of the CC BY-NC license https://creativecommons.org/licenses/by-nc/4.0/.
https://creativecommons.org/licenses/by-nc/4.0/
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