北西アフリカから推論されたベースアルト隕石の新たな源 011
Akira Yamaguchi1, Robert N Clayton, Toshiko K Mayeda
1Antarctic Meteorite Research Center, National Institute of Polar Research, Tokyo 173-8515, Japan. yamaguch@nipr.ac.jp
Science (New York, N.Y.)
|April 16, 2002
まとめ
北西アフリカ (NWA) 011は,玄武岩隕石であり,ユークリットと特徴を共有しているが,ユニークな酸素同位体を持っています. これは,小惑星4 Vestaだけでなく,複数の親体があり,太陽系の初期にベースアルティック隕石が形成されたことを示唆しています.
科学分野:
- 惑星科学は惑星科学である.
- 隕石学は,隕石についてです.
- 宇宙化学 (コスモケミストリー)
背景:
- ユークリトは,小惑星4ヴェスタと結びついた玄武岩隕石です.
- それらは共通の鉱物学,同位体,化学の特徴を共有しています.
- 玄武岩隕石の起源は,初期の太陽系過程を理解するために重要である.
研究 の 目的:
- 北西アフリカ (NWA) 011.11の隕石を分析するために
- NWA 011の性質を,既知のユークリットと比較するために.
- NWA 011の独特の組成が隕石の親体に与える影響を調査する.
主な方法:
- NWA 011.の鉱物分析について
- NWA 011.の同位体分析 (貴気や酸素を含む)
- NWA 011データと既存のユークリットデータセットの比較.
主要な成果:
- NWA 011は,玄武岩のユークリットに似た質感,鉱物学,高貴ガスのシグネチャーを示しています.
- NWA 011の酸素同位体組成は,他のエウクリートと著しく異なる.
- この独特な酸素シグネチャーは,NWA 011.の独立した親体の存在を示唆しています.
結論:
- この発見は,すべての玄武岩ユークリトの単親体の仮説に異議を唱える.
- 初期の太陽系では,複数の小惑星のような天体が存在し,玄武岩隕石を生成した可能性が高い.
- 変数の酸素同位体組成は,これらの初期の太陽系材料の多様な起源を示しています.
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