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CBコンドライトの若いコンドルールは,太陽系の初期に起きた巨大衝突によるコンドライトである
Alexander N Krot1, Yuri Amelin, Patrick Cassen
1Hawai'i Institute of Geophysics & Planetology, School of Ocean & Earth Science & Technology, University of Hawai'i at Manoa, 2525 Correa Rd, Honolulu, Hawaii 96822, USA. sasha@higp.hawaii.edu
Nature
|August 19, 2005
まとめ
隕石の原始的なコンドルルは,太陽系初期の塵から形成された. CBコンドライトに関する新しい研究は,それらは巨大な衝突によって形成され,小惑星帯の初期の惑星形成を示唆していることを示唆しています.
科学分野:
- 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.
- 初期の太陽系進化について
背景:
- コンドルル (chondrules) は,コンドリート隕石の主要成分で,太陽系初期に粉を溶かして形成されたものです.
- その形成の年齢は,原惑星円盤の消散時間尺度と一致しています.
- 以前のモデルでは,原惑星円盤における衝撃波による形成が示唆されていた.
研究 の 目的:
- 金属に富んだCB炭酸性コンドライトにおけるコンドロールの形成年齢とメカニズムを決定する.
- これらの発見が初期の太陽系形成モデルに及ぼす影響を調査する.
主な方法:
- 207Pb-206Pb同位体系を用いた放射線年代測定.
- グジュバとハマダ・アル・ハムラにおけるコンドルル時代の分析 237個の隕石.
主要な成果:
- グジバとハマダハ・アル・ハムラ237のCBコンドルルは,それぞれ4,562.7 +/- 0.5 Myrと4,562.8 +/- 0.9 Myrの年齢を持っています.
- これらのコンドルールは,単一の高エネルギーイベントで形成されました.
- 年代と形成の特徴は,星雲の衝撃波の起源と矛盾しています.
結論:
- CBコンドルールと関連する金属粒は,惑星の胚の間の巨大な衝突によって発生した蒸気溶融の羽根から形成された可能性が高い.
- この衝突は,原惑星円盤における大きな塵の消去後に発生した.
- この発見は,初期の小惑星帯に惑星サイズの物体が存在している証拠を提供し,現在の惑星形成シミュレーションを裏付けている.
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