- Main
Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2
- 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
- et al.
Published Web Location
https://doi.org/10.1126/sciadv.ade2067Abstract
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.
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