主要な小惑星の衝突後,隕石を地球に素早く送還する
Philipp R Heck1, Birger Schmitz, Heinrich Baur
1ETH Zürich, Isotope Geology, NO C61, CH-8092 Zürich, Switzerland.
Nature
|July 16, 2004
まとめ
大きな小惑星の衝突は,隕石を地球に素早く届ける可能性があります. この研究は,小惑星の断片を約10 ^ 5年という短い転送時間を確認し,軌道シミュレーションを検証しています.
科学分野:
- 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)
- 地質学 地質学 地質学
背景:
- 小惑星帯の衝突は,地球の隕石の衝突率を増やす可能性があります.
- 軌道ダイナミクスは,現在観測されているよりも早く,断片が地球に到達することを示唆しています.
- 小惑星の衝突による高効率な隕石配送メカニズムには,実証的検証が必要です.
研究 の 目的:
- 小惑星の衝突から地球への隕石の移動時間を調査する.
- 軌道シミュレーションによって予測された急速な隕石の配送の経験的証拠を提供するために.
- 古代の化石隕石の宇宙線で生成された高貴なガスを分析するために.
主な方法:
- クロミット粒子の高感度高貴ガス測定.
- 約4億8千万年前の堆積物からの化石隕石の分析.
- 移転時間と層図の高さとの相関関係.
主要な成果:
- 推論された隕石移転時間は,およそ10^5年ほど短い.
- 移転時間は,堆積の持続時間と一致して,層図の高さとともに増加した.
- 破壊された小惑星からの長期間の隕石雨の証拠.
結論:
- 小惑星の衝突により,地球への高効率な隕石運送軌跡が作られることが確認された.
- 小惑星帯の強い共鳴が,短期間で太陽系の内部に物質を運ぶことができることを示しています.
- 大規模な衝突イベント後の小惑星の断片の急速な配送のための強力な証拠を提供します.
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