학술논문
Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2
Document Type
article
Author
Kawasaki, Noriyuki; Nagashima, Kazuhide; Sakamoto, Naoya; Matsumoto, Toru; Bajo, Ken-ichi; Wada, Sohei; Igami, Yohei; Miyake, Akira; Noguchi, Takaaki; Yamamoto, Daiki; Russell, Sara S; Abe, Yoshinari; Aléon, Jérôme; Alexander, Conel M O’D; Amari, Sachiko; Amelin, Yuri; Bizzarro, Martin; Bouvier, Audrey; Carlson, Richard W; Chaussidon, Marc; Choi, Byeon-Gak; Dauphas, Nicolas; Davis, Andrew M; Di Rocco, Tommaso; Fujiya, Wataru; Fukai, Ryota; Gautam, Ikshu; Haba, Makiko K; Hibiya, Yuki; Hidaka, Hiroshi; Homma, Hisashi; Hoppe, Peter; Huss, Gary R; Ichida, Kiyohiro; Iizuka, Tsuyoshi; Ireland, Trevor R; Ishikawa, Akira; Ito, Motoo; Itoh, Shoichi; Kita, Noriko T; Kitajima, Kouki; Kleine, Thorsten; Komatani, Shintaro; Krot, Alexander N; Liu, Ming-Chang; Masuda, Yuki; McKeegan, Kevin D; Morita, Mayu; Motomura, Kazuko; Moynier, Frédéric; Nakai, Izumi; Nguyen, Ann; Nittler, Larry; Onose, Morihiko; Pack, Andreas; Park, Changkun; Piani, Laurette; Qin, Liping; Schönbächler, Maria; Tafla, Lauren; Tang, Haolan; Terada, Kentaro; Terada, Yasuko; Usui, Tomohiro; Wadhwa, Meenakshi; Walker, Richard J; Yamashita, Katsuyuki; Yin, Qing-Zhu; Yokoyama, Tetsuya; Yoneda, Shigekazu; Young, Edward D; Yui, Hiroharu; Zhang, Ai-Cheng; Nakamura, Tomoki; Naraoka, Hiroshi; Okazaki, Ryuji; Sakamoto, Kanako; Yabuta, Hikaru; Abe, Masanao; Miyazaki, Akiko; Nakato, Aiko; Nishimura, Masahiro; Okada, Tatsuaki; Yada, Toru; Yogata, Kasumi; Nakazawa, Satoru; Saiki, Takanao; Tanaka, Satoshi; Terui, Fuyuto; Tsuda, Yuichi; Watanabe, Sei-ichiro; Yoshikawa, Makoto; Tachibana, Shogo; Yurimoto, Hisayoshi
Source
Science Advances. 8(50)
Subject
Language
Abstract
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: 16O-rich (associated with refractory inclusions) and 16O-poor (associated with chondrules). Both the 16O-rich and 16O-poor minerals probably formed in the inner solar protoplanetary disk and were subsequently transported outward. The abundance ratios of the 16O-rich to 16O-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.