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タイトル: | Discovery of moganite in a lunar meteorite as a trace of H2O ice in the Moon’s regolith |
著者: | Kayama, Masahiro Tomioka, Naotaka Ohtani, Eiji Seto, Yusuke Nagaoka, Hiroshi Götze, Jens Miyake, Akira https://orcid.org/0000-0002-6197-4656 (unconfirmed) Ozawa, Shin Sekine, Toshimori Miyahara, Masaaki Tomeoka, Kazushige Matsumoto, Megumi Shoda, Naoki Hirao, Naohisa Kobayashi, Takamichi |
著者名の別形: | 鹿山, 雅裕 富岡, 尚敬 大谷, 栄治 瀬戸, 雄介 長岡, 央 三宅, 亮 小澤, 信 関根, 利守 宮原, 正明 留岡, 和重 松本, 恵 平尾, 直久 小林, 敬道 |
発行日: | 2-May-2018 |
出版者: | American Association for the Advancement of Science (AAAS) |
誌名: | Science Advances |
巻: | 4 |
号: | 5 |
論文番号: | eaar4378 |
抄録: | Moganite, a monoclinic SiO2 phase, has been discovered in a lunar meteorite. Silica micrograins occur as nanocrystalline aggregates of mostly moganite and occasionally coesite and stishovite in the KREEP (high potassium, rare-earth element, and phosphorus)–like gabbroic-basaltic breccia NWA 2727, although these grains are seemingly absent in other lunar meteorites. We interpret the origin of these grains as follows: alkaline water delivery to the Moon via carbonaceous chondrite collisions, fluid capture during impact-induced brecciation, moganite precipitation from the captured H2O at pH 9.5 to 10.5 and 363 to 399 K on the sunlit surface, and meteorite launch from the Moon caused by an impact at 8 to 22 GPa and >673 K. On the subsurface, this captured H2O may still remain as ice at estimated bulk content of >0.6 weight %. This indicates the possibility of the presence of abundant available water resources underneath local sites of the host bodies within the Procellarum KREEP and South Pole Aitken terranes. |
記述: | 月の地下に大量の氷が埋蔵されている可能性 --月隕石から氷の痕跡である「モガナイト」を発見、月で利用可能な水資源に期待--. 京都大学プレスリリース. 2018-05-09. |
著作権等: | © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/231031 |
DOI(出版社版): | 10.1126/sciadv.aar4378 |
PubMed ID: | 29732406 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2018-05-09-0 |
出現コレクション: | 学術雑誌掲載論文等 |
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