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      Accretion regions of meteorite parent bodies inferred from a two-endmember isotopic mixing model

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          ABSTRACT

          The diverse isotopic anomalies of meteorites demonstrate that the protoplanetary disc was composed of components from different stellar sources, which mixed in the disc and formed the planetary bodies. However, the origin of the accretion materials of different planetary bodies and the cosmochemical relationship between these bodies remain ambiguous. The noncarbonaceous (NC) planetary bodies originate from the inner solar system and have isotopic compositions distinct from those of the carbonaceous (CC) bodies. We combined Ca, Ti, Cr, Fe, Ni, Mo, and Ru isotopic anomalies to develop a quantitative two-endmember mixing model of the NC bodies. Correlations of the isotopic anomalies of different elements with different cosmochemical behaviors originate from the mixing of two common endmembers. Using this mixing model, we calculated the isotopic anomalies of NC bodies for all the considered isotopes, including the isotopic anomalies that are difficult to measure or have been altered by spallation processes. The mixing proportion between the two endmembers in each NC body has been calculated as a cosmochemical parameter, which represents the compositional relationship of the accretion materials between the NC bodies. Using the calculated mixing proportions, the feeding zones of the NC bodies could be estimated. The estimated feeding zones of NC bodies indicate a large population of interlopers in the main asteroid belt and an indigenous origin of Vesta. The feeding zones estimated in different planet formation scenarios indicate that the orbits of Jupiter and Saturn during formation of terrestrial planets were likely to be more circular than their current ones.

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                Author and article information

                Contributors
                Journal
                Monthly Notices of the Royal Astronomical Society
                Oxford University Press (OUP)
                0035-8711
                1365-2966
                June 2022
                April 22 2022
                June 2022
                April 22 2022
                March 29 2022
                : 513
                : 1
                : 363-373
                Affiliations
                [1 ]State Key Laboratory for Mineral Deposits Research & Lunar and Planetary Science Institute, School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
                [2 ]CAS Center for Excellence in Comparative Planetology, Hefei, Anhui 230026, China
                [3 ]School of Astronomy and Space Science & MOE Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Nanjing, Jiangsu 210023, China
                Article
                10.1093/mnras/stac849
                10716f3f-8560-43c7-a4e6-e3cec5af8e03
                © 2022

                https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model

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