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- 富岡 尚敬
- 海洋研究開発機構 高知コア研究所
書誌事項
- タイトル別名
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- Akimotoite, a new mineral discovered in a shocked meteorite
抄録
<p>Akimotoite (IMA1997-044), (Mg,Fe)SiO3, a new silicate mineral of the ilmenite group, has been discovered in the shocked Tenham chondritic meteorite. It occurs as aggregates adjacent to clinoenstatite in host-rock fragments trapped into shock-induced melt veins. Chemical analysis gives the simplified formula to be (Mg0.79Fe0.21)SiO3, the same as for clinoenstatite. Selected-area electron diffraction (SAED) patterns correspond to the synthetic (Mg,Fe)SiO3 ilmenite phase with the space group R3. The lattice parameters estimated from the SAED patterns are a = 0.478(5) nm, c = 1.36(1) nm in the hexagonal setting. The calculated density is 4.0(1) g/cm3. In a shock-induced melt vein, akimotoite and clinoenstatite are intergrown with a topotaxial relationship in which close-packed oxygen layers of both phases are preserved. This occurrence suggests that the enstatite-akimotoite transition was caused by a shear transformation mechanism without long-range atomic diffusion.</p>
収録刊行物
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- 岩石鉱物科学
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岩石鉱物科学 53 (1), n/a-, 2024
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390580143068236672
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- ISSN
- 13497979
- 1345630X
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
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- 抄録ライセンスフラグ
- 使用不可