まとめ
隕石で見つかったクリントナイトやマーガライトのようなカルシウムミカは,初期の太陽星雲の水分化を示唆しています. これらの鉱物は,惑星の蓄積が起こる前に,適度な温度変化が起こったことを示しています.
科学分野:
- ミネラロジーは,鉱物学です.
- 宇宙化学 (コスモケミストリー)
- 惑星科学は惑星科学である.
背景:
- カルシウムとアルミニウムが豊富なインクルージョン (CAI) は,原始的な太陽系材料です.
- 以前の研究では,高温でCAIが揮発性物質に富んだ蒸気によって変化することを示唆していた.
研究 の 目的:
- CAIの改変経歴を調査する.
- CAI内の鉱物形成の条件を特定する.
主な方法:
- アレンデ隕石のペトログラフィック分析.
- CAI変異製品におけるカルシウムミカ (クリントンਾਈਟとマーガライト) の特定.
主要な成果:
- クリントナイトとマーガライトは,アレンデ隕石からのCAIで特定されました.
- クリントナイトはグロスラー石の代わりに発見され,マルガライトはアノルタイトのラメラとして発生しました.
- これらのミカスの存在は,高温変化に加えて,適度な温度変化 (<=400 K) が起こったことを示唆しています.
結論:
- CAIのカルシウムミカは,初期の太陽星雲における水分化反応の証拠を提供します.
- これらの鉱物は,蓄積前に形成されたが,層状のリム配列の発達後に形成された.
- この発見は,初期の太陽星雲の変化の条件に関する以前の仮定に異議を唱える.
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