biostudies-literatureUnknown98(6)Nakamura EPresented 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 thProceedings of the Japan Academy. Series B, Physical and biological sciences227-282https://www.ebi.ac.uk/biostudies/studies/S-EPMC9246647biostudies-literatureOn the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective.PMC9246647Kumagai KYachi YKikuchi SHosoda SOgawa KYogata KOzaki MYokota YSakaguchi CMorota THayakawa MKawahara KKobayashi KKumar RTatsumi EUsui TAvramescu MLFukai RShirai KTakeuchi HShimaki YSoejima HFujimoto MIshiguro MYamanaka MNoda HTsuchida HYamada THatakeda KWada KNakamura ENakazawa SYoshikawa KYamada MKitazato KYoshikawa MWatanabe SISuzuki AAbe MHirata NIkeda HHitomi YIshihara YYamamoto YYano HOgawa NSenshu HNakato AFujii AOta TSugita SMiura HTsuda YHayashi TYoshitake MSawada HNoguchi RSakatani NFuruya STanaka STanaka RYoshihara KKunihiro TYamamoto DTsukizaki RTerui FKitagawa HMiura AMimasu YTripathi HHonda CMiyazaki ANishimura MMichikami TSaiki TNamiki NOkamoto CIijima YIIwata THonda RRatnayake DMMatsumoto KPotiszil CArakawa MOno GYada TOkada TMatsuoka MTakei YfalseOn the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective.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 th2022-01-01T00:00:00Z20222025-04-05T11:48:44.467Z2025-04-05T11:48:44.467ZS-EPMC92466473569184510.2183/pjab.98.015