カリウム,ルビジウム,ストロンチウム,バリウム,そして稀土の濃度は,月の岩石と分離した相にある
まとめ
アポロ11号の月面サンプルには,高濃度のバリウムと希土元素が含まれている. 微量元素のデータは,これらの月面岩が隕石のような物質の部分的な融解によって形成されたことを示唆しています.
科学分野:
- 月面の地質学と地化学
- 惑星科学は惑星科学である.
- 宇宙化学 (コスモケミストリー)
背景:
- 月面のサンプルの元素組成を理解することは,その起源と進化を解読する上で極めて重要です.
- 以前の研究では,比較のために隕石と地上の岩石における基本元素の豊富さを確立しました.
研究 の 目的:
- アポロ11号のサンプルの特定の微量元素 (カリウム,ルビジウム,ストロンチウム,バリウム,希土元素) の濃度を測定する.
- これらの元素の豊富さを,隕石や地上の材料で見つかったものと比較する.
- 月面サンプルを形成した石油生成過程を推論する.
主な方法:
- 精度の高い元素濃度測定のために,質量スペクトロメトリック同位素の希釈を用いた.
- アポロ11号の月面から採取した8つのサンプルとその分離した鉱物相を分析した.
主要な成果:
- カリウムとルビジウムの濃度はコンドリートレベルであることが判明しました.
- ストロンチウムの濃度は約15倍,バリウムと希土元素の濃度は30~100倍であった.
- 重要な微量元素の類似性は,月面のサンプル,玄武岩アコンドライト,地上の掘削玄武岩,および地球の大量物体間で観察されました.
結論:
- 微量元素のデータは,アポロ11号の月面サンプルが,限られた部分的融合から生まれたという仮説を裏付けている.
- この部分的融合の原料は,ブレキ化ユークリート隕石と似ています.
- これらの発見は,月,地,隕石の材料の関係を理解するのに役立ちます.
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