日本結晶学会誌
Online ISSN : 1884-5576
Print ISSN : 0369-4585
1.鉱物の微細組織と結晶学
隕石と地球深部におけるメージャライトガーネットの秩序-無秩序転移
富岡 尚敬
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ジャーナル フリー

2018 年 60 巻 1 号 p. 2-8

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Microstructures and symmetries of synthetic and natural(Mg, Fe)SiO3 garnet(majorite)have been investigated by transmission electron microscopy. Modulated and twin structures commonly observed in the synthetic majorite suggest a cubic-tetragonal phase transition due to cation ordering in its octahedral sites during quenching. Natural tetragonal majorite, which was newly discovered in a shock meteorite, has less-ordered octahedral cations than those in the synthetic samples. The order-disorder state of majorite provides important constraints not only on shock metamorphism of meteorites, but also on the deep Earth's mineralogy.

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© 2018 日本結晶学会
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