Discovery of moganite in a lunar meteorite as a trace of H2O ice in the Moon's regolith

Masahiro Kayama, Naotaka Tomioka, Eiji Ohtani, Yusuke Seto, Hiroshi Nagaoka, Jens Götze, Akira Miyake, Shin Ozawa, Toshimori Sekine, Masaaki Miyahara, Kazushige Tomeoka, Megumi Matsumoto, Naoki Shoda, Naohisa Hirao, Takamichi Kobayashi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Moganite, a monoclinic SiO2 phase, has been discovered in a lunar meteorite. Silicamicrograins 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 H2Omay 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.

Original languageEnglish
Article numbereaar4378
JournalScience Advances
Volume4
Issue number5
DOIs
Publication statusPublished - 2018 May 2

ASJC Scopus subject areas

  • General

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