On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective

Eizo Nakamura(Okayama University), K. Kobayashi(Okayama University), Ryoji Tanaka(Okayama University), T. Kunihiro(Okayama University), Hiroshi Kitagawa(Okayama University), Christian Potiszil(Okayama University), Tsutomu Ota(Okayama University), Chie Sakaguchi(Okayama University), Masahiro Yamanaka(Okayama University), Dilan M. Ratnayake(Okayama University), Havishk TRIPATHI(Okayama University), Rahul KUMAR(Okayama University), Maya-Liliana Avramescu(Okayama University), Hidehisa TSUCHIDA(Okayama University), Yusuke Yachi(Okayama University), Hitoshi Miura(Nagoya City University), Masanao Abe(The Graduate University for Advanced Studies, SOKENDAI), Ryota Fukai(Japan Aerospace Exploration Agency), Shizuho Furuya(Japan Aerospace Exploration Agency), Kentaro Hatakeda(Japan Aerospace Exploration Agency), Tasuku Hayashi(Japan Aerospace Exploration Agency), Yuya Hitomi(Japan Aerospace Exploration Agency), Kazuya Kumagai(Japan Aerospace Exploration Agency), Akiko Miyazaki(Japan Aerospace Exploration Agency), Aiko Nakato(Japan Aerospace Exploration Agency), Masahiro Nishimura(Japan Aerospace Exploration Agency), Tatsuaki Okada(Japan Aerospace Exploration Agency), Hiromichi Soejima(Japan Aerospace Exploration Agency), Seiji Sugita(The University of Tokyo), Ayako Suzuki(Japan Aerospace Exploration Agency), Tomohiro Usui(Japan Aerospace Exploration Agency), Toru Yada(Japan Aerospace Exploration Agency), Daiki Yamamoto(Japan Aerospace Exploration Agency), Kasumi Yogata(Japan Aerospace Exploration Agency), Miwa Yoshitake(Japan Aerospace Exploration Agency), Masahiko Arakawa(Kobe University), Atsushi Fujii(Japan Aerospace Exploration Agency), Masahiko Hayakawa(Japan Aerospace Exploration Agency), Naoyuki Hirata(University of Aizu), Naru Hirata(University of Aizu), Rie Honda(Kōchi University), Chikatoshi Honda(University of Aizu), S Hosoda(Japan Aerospace Exploration Agency), Yuichi Iijima(Japan Aerospace Exploration Agency), Hitoshi Ikeda, Masateru Ishiguro(Seoul National University), Yoshiaki Ishihara(Japan Aerospace Exploration Agency), Takahiro Iwata(The Graduate University for Advanced Studies, SOKENDAI), Kosuke Kawahara(Japan Aerospace Exploration Agency), Shota Kikuchi(Japan Aerospace Exploration Agency), K. Kitazato(University of Aizu), Koji Matsumoto(National Astronomical Observatory of Japan), M. Matsuoka(Observatoire de Paris), Tatsuhiro Michikami(Kindai University), Yuya Mimasu(Japan Aerospace Exploration Agency), Akira Miura(Japan Aerospace Exploration Agency), Tomokatsu Morota(Nagoya University), Satoru Nakazawa(Japan Aerospace Exploration Agency), Noriyuki Namiki(National Astronomical Observatory of Japan), Hirotomo Noda(National Astronomical Observatory of Japan), Rina Noguchi(Japan Aerospace Exploration Agency), Naoko Ogawa(Japan Aerospace Exploration Agency), Kazunori Ogawa(Japan Aerospace Exploration Agency), Chisato Okamoto(Kobe University), Go Ono, Masanobu Ozaki(Japan Aerospace Exploration Agency), Takanao Saiki(Japan Aerospace Exploration Agency), Naoya Sakatani(Rikkyo University), Hirotaka Sawada(Japan Aerospace Exploration Agency), Hiroki Senshu(Chiba Institute of Technology), Yuri Shimaki(Japan Aerospace Exploration Agency), K. Shirai(Japan Aerospace Exploration Agency), Yuto Takei(Japan Aerospace Exploration Agency), Hiroshi Takeuchi(Japan Aerospace Exploration Agency), Satoshi Tanaka(The Graduate University for Advanced Studies, SOKENDAI), Eri Tatsumi(Universidad de La Laguna), Fuyuto Terui(Kanagawa Institute of Technology), Ryudo Tsukizaki(Japan Aerospace Exploration Agency), Koji Wada(Chiba Institute of Technology), Manabu Yamada(Chiba Institute of Technology), Tetsuya Yamada(Japan Aerospace Exploration Agency), Yukio Yamamoto(Japan Aerospace Exploration Agency), Hajime Yano(Japan Aerospace Exploration Agency), Y. Yokota(Japan Aerospace Exploration Agency), Keisuke Yoshihara(Japan Aerospace Exploration Agency), Makoto Yoshikawa(The Graduate University for Advanced Studies, SOKENDAI), Kent Yoshikawa, M. Fujimoto(Japan Aerospace Exploration Agency), Sei‐ichiro Watanabe(Nagoya University), Yuichi Tsuda(Japan Aerospace Exploration Agency)
Proceedings of the Japan Academy Series B
June 9, 2022
10.2183/pjab.98.015
Cited by 193Open Access
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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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