Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Title data

Piani, Laurette ; Nagashima, Kazuhide ; Kawasaki, Noriyuki ; Sakamoto, Naoya ; Bajo, Ken-ichi ; 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 ; 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 ; Qin, Liping ; Russell, Sara S. ; Schönbächler, Maria ; Tafla, Lauren ; Tang, Haolan ; Terada, Kentaro ; Terada, Yasuko ; Usui, Tomohiro ; Wada, Sohei ; 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:
Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu.
In: The Astrophysical Journal Letters. Vol. 946 (2023) Issue 2 . - L43.
ISSN 2041-8213
DOI: https://doi.org/10.3847/2041-8213/acc393

Official URL:

Abstract in another language

Rock fragments of the Cb-type asteroid Ryugu returned to Earth by the JAXA Hayabusa2 mission share mineralogical, chemical, and isotopic properties with the Ivuna-type (CI) carbonaceous chondrites. Similar to CI chondrites, these fragments underwent extensive aqueous alteration and consist predominantly of hydrous minerals likely formed in the presence of liquid water on the Ryugu parent asteroid. Here we present an in situ analytical survey performed by secondary ion mass spectrometry from which we have estimated the D/H ratio of Ryugu’s hydrous minerals, D/HRyugu, to be 165 ± 19 × 10−6, which corresponds to δDRyugu = +59 ± 121‰ (2σ). The hydrous mineral D/HRyugu’s values for the two sampling sites on Ryugu are similar; they are also similar to the estimated D/H ratio of hydrous minerals in the CI chondrites Orgueil and Alais. This result reinforces a link between Ryugu and CI chondrites and an inference that Ryugu’s samples, which avoided terrestrial contamination, are our best proxy to estimate the composition of water at the origin of hydrous minerals in CI-like material. Based on this data and recent literature studies, the contribution of CI chondrites to the hydrogen of Earth’s surficial reservoirs is evaluated to be ∼3%. We conclude that the water responsible for the alteration of Ryugu’s rocks was derived from water ice precursors inherited from the interstellar medium; the ice partially re-equilibrated its hydrogen with the nebular H2 before being accreted on the Ryugu’s parent asteroid.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Research Institutions > Central research institutes > Bavarian Research Institute of Experimental Geochemistry and Geophysics - BGI
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 550 Earth sciences, geology
Date Deposited:	16 Oct 2024 12:43
Last Modified:	16 Oct 2024 12:43
URI:	https://eref.uni-bayreuth.de/id/eprint/90712