Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2.
Noriyuki KawasakiKazuhide NagashimaNaoya SakamotoToru MatsumotoKen-Ichi BajoSohei WadaYohei IgamiAkira MiyakeTakaaki NoguchiDaiki YamamotoSara S RussellYoshinari AbeJérôme AléonConel M O'D AlexanderSachiko AmariYuri AmelinMartin BizzarroAudrey BouvierRichard W CarlsonMarc ChaussidonByeon-Gak ChoiNicolas DauphasAndrew M DavisTommaso Di RoccoWataru FujiyaRyohta FukaiIkshu GautamMakiko K HabaYuki HibiyaHiroshi HidakaHisashi HommaPeter HoppeGary R HussKiyohiro IchidaTsuyoshi IizukaTrevor R IrelandAkira IshikawaMotoo ItoShoichi ItohNoriko T KitaKouki KitajimaThorsten KleineShintaro KomataniAlexander N KrotMing-Chang LiuYuki MasudaKevin D McKeeganMayu MoritaKazuko MotomuraFrederic MoynierIzumi NakaiAnn N NguyenLarry R NittlerMorihiko OnoseAndreas PackChangkun ParkLaurette PianiLiping QinMaria SchönbächlerLauren TaflaHaolan TangKentaro TeradaYasuko TeradaTomohiro UsuiMeenakshi WadhwaRichard J WalkerKatsuyuki YamashitaQing-Zhu YinTetsuya YokoyamaShigekazu YonedaEdward D YoungHiroharu YuiAi-Cheng ZhangTomoki NakamuraHiroshi NaraokaRyuji OkazakiKanako SakamotoHikaru YabutaMasanao AbeAkiko MiyazakiAiko NakatoMasahiro NishimuraTatsuaki OkadaToru YadaKasumi YogataSatoru NakazawaTakanao SaikiSatoshi TanakaFuyuto TeruiYuichi TsudaSei'ichiro WatanabeMakoto YoshikawaShogo TachibanaHisayoshi YurimotoPublished in: Science advances (2022)
The extraterrestrial materials returned from asteroid (162173) Ryugu consist predominantly of low-temperature aqueously formed secondary minerals and are chemically and mineralogically similar to CI (Ivuna-type) carbonaceous chondrites. Here, we show that high-temperature anhydrous primary minerals in Ryugu and CI chondrites exhibit a bimodal distribution of oxygen isotopic compositions: 16 O-rich (associated with refractory inclusions) and 16 O-poor (associated with chondrules). Both the 16 O-rich and 16 O-poor minerals probably formed in the inner solar protoplanetary disk and were subsequently transported outward. The abundance ratios of the 16 O-rich to 16 O-poor minerals in Ryugu and CI chondrites are higher than in other carbonaceous chondrite groups but are similar to that of comet 81P/Wild2, suggesting that Ryugu and CI chondrites accreted in the outer Solar System closer to the accretion region of comets.