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原始的な隕石の親体における初期の水性活動
M Endress1, E Zinner, A Bischoff
1Institute of Planetology, University of Münster, Germany.
Nature
|February 22, 1996
まとめ
隕石の水性変異は,太陽系初期に,最も古い太陽雲凝縮物が形成されてから2千万年以内に発生した. この発見は,初期の太陽系プロセスと隕石の進化に関する私たちの理解を洗練します.
科学分野:
- コスミック・ケミストリー 宇宙の化学
- 惑星科学は惑星科学である.
- ジオクロノロジー (Geochronology) について
背景:
- 初期の太陽系では,恒星間物質の化学的,物理的な処理が顕著であった.
- 炭酸性CIコンドライトは,原始的な太陽系天体についての洞察を提供しますが,その変化過程の詳細な研究が必要です.
- 隕石の蓄積後の変化,特に炭酸塩の形成は完全に理解されていません.
研究 の 目的:
- CIコンドライトの水性変化のタイミングを調査する.
- 隕石の母体における無水物質と流体間の反応の時間スケールを制限するために.
- 太陽系の初期の化学的進化における水質変化の役割を確立する.
主な方法:
- CIコンドライトのオルゲイルとイヴナから得られた炭酸塩断片の過剰53Cr (短期間の53Mn分解の産物) の測定.
- 53Mn-53Crシステムを用いた放射線年代測定.
主要な成果:
- 炭酸塩の断片に 53Cr の過多量が検出されました.
- 小さな原始惑星の天体の水質の変化は,最も古い太陽雲の凝縮物が形成されてから2千万年以内に始まった.
- このタイムスケールは,以前に推測された限界よりもかなり短い.
結論:
- 水による変異は,太陽系の歴史において非常に初期のプロセスでした.
- 水質変化の初期発生は,原惑星体の化学的進化に大きく影響した.
- これらの発見は,初期の太陽系における出来事の年代順を洗練している.
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