Coesite and stishovite in a shocked lunar meteorite, Asuka-881757, and impact events in lunar surface.

E. Ohtani, S. Ozawa, M. Miyahara, Y. Ito, T. Mikouchi, M. Kimura, T. Arai, K. Sato, K. Hiraga

研究成果: Article査読

35 被引用数 (Scopus)

抄録

Microcrystals of coesite and stishovite were discovered as inclusions in amorphous silica grains in shocked melt pockets of a lunar meteorite Asuka-881757 by micro-Raman spectrometry, scanning electron microscopy, electron back-scatter diffraction, and transmission electron microscopy. These high-pressure polymorphs of SiO(2) in amorphous silica indicate that the meteorite experienced an equilibrium shock-pressure of at least 8-30 GPa. Secondary quartz grains are also observed in separate amorphous silica grains in the meteorite. The estimated age reported by the (39)Ar/(40)Ar chronology indicates that the source basalt of this meteorite was impacted at 3,800 Ma ago, time of lunar cataclysm; i.e., the heavy bombardment in the lunar surface. Observation of coesite and stishovite formed in the lunar breccias suggests that high-pressure impact metamorphism and formation of high-pressure minerals are common phenomena in brecciated lunar surface altered by the heavy meteoritic bombardment.

本文言語English
ページ(範囲)463-466
ページ数4
ジャーナルProceedings of the National Academy of Sciences of the United States of America
108
2
DOI
出版ステータスPublished - 2011 1月 11

ASJC Scopus subject areas

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