The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites
Creators: name: Spitzer, Fridolin
name: Kleine, Thorsten
name: Burkhardt, Christoph
name: Hopp, Timo
name: Yokoyama, Tetsuya
name: Abe, Yoshinari
name: Aléon, Jérôme
name: Alexander, Conel M. O'D.
name: Amari, Sachiko
name: Amelin, Yuri
name: Bajo, Ken-ichi
name: Bizzarro, Martin
name: Bouvier, Audrey
name: Carlson, Richard W.
name: Chaussidon, Marc
name: Choi, Byeon-Gak
name: Dauphas, Nicolas
name: Davis, Andrew M.
name: Di Rocco, Tommaso
name: Fujiya, Wataru
name: Fukai, Ryota
name: Gautam, Ikshu
name: Haba, Makiko K.
name: Hibiya, Yuki
name: Hidaka, Hiroshi
name: Homma, Hisashi
name: Hoppe, Peter
name: Huss, Gary R.
name: Ichida, Kiyohiro
name: Iizuka, Tsuyoshi
name: Ireland, Trevor R.
name: Ishikawa, Akira
name: Itoh, Shoichi
name: Kawasaki, Noriyuki
name: Kita, Noriko T.
name: Kitajima, Kouki
name: Komatani, Shintaro
name: Krot, Alexander N.
name: Liu, Ming-Chang
name: Masuda, Yuki
name: Morita, Mayu
name: Moynier, Fréderic
name: Motomura, Kazuko
name: Nakai, Izumi
name: Nagashima, Kazuhide
name: Nguyen, Ann
name: Nittler, Larry
name: Onose, Morihiko
name: Pack, Andreas
name: Park, Changkun
name: Piani, Laurette
name: Qin, Liping
name: Russell, Sara S.
name: Sakamoto, Naoya
name: Schönbächler, Maria
name: Tafla, Lauren
name: Tang, Haolan
name: Terada, Kentaro
name: Terada, Yasuko
name: Usui, Tomohiro
name: Wada, Sohei
name: Wadhwa, Meenakshi
name: Walker, Richard J.
name: Yamashita, Katsuyuki
name: Yin, Qing-Zhu
name: Yoneda, Shigekazu
name: Young, Edward D.
name: Yui, Hiroharu
name: Zhang, Ai-Cheng
name: Nakamura, Tomoki
name: Naraoka, Hiroshi
name: Noguchi, Takaaki
name: Okazaki, Ryuji
name: Sakamoto, Kanako
name: Yabuta, Hikaru
name: Abe, Masanao
name: Miyazaki, Akiko
name: Nakato, Aiko
name: Nishimura, Masahiro
name: Okada, Tatsuaki
name: Yada, Toru
name: Yogata, Kasumi
name: Nakazawa, Satoru
name: Saiki, Takanao
name: Tanaka, Satoshi
name: Terui, Fuyuto
name: Tsuda, Yuichi
name: Watanabe, Sei-ichiro
name: Yoshikawa, Makoto
name: Tachibana, Shogo
name: Yurimoto, Hisayoshi
Publisher: name: arXiv
Year: 2024
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct from other carbonaceous chondrites, which has led to the suggestion that Ryugu and CI chondrites formed in a different region of the accretion disk, possibly around the orbits of Uranus and Neptune. We show that, like for Fe, Ryugu and CI chondrites also have indistinguishable Ni isotope anomalies, which differ from those of other carbonaceous chondrites. We propose that this unique Fe and Ni isotopic composition reflects different accretion efficiencies of small FeNi metal grains among the carbonaceous chondrite parent bodies. The CI chondrites incorporated these grains more efficiently, possibly because they formed at the end of the disk's lifetime, when planetesimal formation was also triggered by photoevaporation of the disk. Isotopic variations among carbonaceous chondrites may thus reflect fractionation of distinct dust components from a common reservoir, implying CI chondrites and Ryugu may have formed in the same region of the accretion disk as other carbonaceous chondrites.
description: Published open access in Science Advances