Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu
-
Published:2023-04-01
Issue:2
Volume:946
Page:L43
-
ISSN:2041-8205
-
Container-title:The Astrophysical Journal Letters
-
language:
-
Short-container-title:ApJL
Author:
Piani LauretteORCID, Nagashima Kazuhide, Kawasaki Noriyuki, Sakamoto NaoyaORCID, Bajo Ken-ichi, Abe Yoshinari, Aléon Jérôme, O’D. Alexander Conel M.ORCID, Amari SachikoORCID, Amelin Yuri, Bizzarro MartinORCID, Bouvier AudreyORCID, Carlson Richard W.ORCID, Chaussidon MarcORCID, Choi Byeon-Gak, Dauphas Nicolas, Davis Andrew M.ORCID, Di Rocco Tommaso, Fujiya WataruORCID, Fukai RyotaORCID, Gautam IkshuORCID, Haba Makiko K., Hibiya YukiORCID, Hidaka HiroshiORCID, Homma HisashiORCID, Hoppe PeterORCID, Huss Gary R.ORCID, Ichida Kiyohiro, Iizuka TsuyoshiORCID, Ireland Trevor R., Ishikawa AkiraORCID, Itoh Shoichi, Kita Noriko T., Kitajima KoukiORCID, Kleine Thorsten, Komatani Shintaro, Krot Alexander N., Liu Ming-Chang, Masuda YukiORCID, McKeegan Kevin D., Morita MayuORCID, Motomura KazukoORCID, Moynier Frédéric, Nakai Izumi, Nguyen AnnORCID, Nittler Larry, Onose Morihiko, Pack Andreas, Park ChangkunORCID, Qin Liping, Russell Sara S., Schönbächler MariaORCID, Tafla LaurenORCID, Tang HaolanORCID, Terada Kentaro, Terada Yasuko, Usui Tomohiro, Wada SoheiORCID, Wadhwa MeenakshiORCID, Walker Richard J.ORCID, Yamashita Katsuyuki, Yin Qing-ZhuORCID, Yokoyama TetsuyaORCID, Yoneda ShigekazuORCID, Young Edward D.ORCID, Yui Hiroharu, Zhang Ai-ChengORCID, Nakamura Tomoki, Naraoka HiroshiORCID, Okazaki RyujiORCID, Sakamoto Kanako, Yabuta Hikaru, Abe Masanao, Miyazaki Akiko, Nakato Aiko, Nishimura Masahiro, Okada TatsuakiORCID, Yada ToruORCID, Yogata Kasumi, Nakazawa SatoruORCID, Saiki Takanao, Tanaka SatoshiORCID, Terui Fuyuto, Tsuda Yuichi, Watanabe Sei-ichiroORCID, Yoshikawa MakotoORCID, Tachibana ShogoORCID, Yurimoto HisayoshiORCID
Abstract
Abstract
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.
Funder
Agence Nationale de la Recherche Centre National d’Etudes Spatiales
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|