ボスムトウィの衝撃変形は,衝撃クレーターの岩石,衝撃減弱,上昇形成を伴う
Ludovic Ferrière1, Christian Koeberl, Boris A Ivanov
1Department of Lithospheric Research, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria.
Science (New York, N.Y.)
|December 17, 2008
まとめ
ボスムツィククレーターの調査は,その中央の上昇における衝撃の弱まりを明らかにします. 屈折性変形ではなく,脆性欠損が,適度な大きさの衝突クレーターにおける上昇を支配する.
科学分野:
- 地質学 地質学 地質学
- 惑星科学は惑星科学である.
- インパクトクラテリング (インパクトクラテリング)
背景:
- 複雑な衝突構造には,衝撃波の減弱と中央の上昇形成に関する正確な制約がない.
- これらのプロセスを理解することは,地球や他の惑星の衝撃イベントの解釈に不可欠です.
研究 の 目的:
- 中等サイズの複雑な衝突クレーターにおける衝撃波減弱と中央上昇力学を抑制するために.
- ボスムツィククレーターで掘削された地下岩の衝突前の位置を再構築する.
主な方法:
- ボスムツィククレーターから掘削された地下岩の衝撃変異の分析.
- 中央上昇中の不弾性岩の変形と変化の数値モデリング.
- 衝撃を受けたクォーツの粒と平面変形の特徴を定量化するためのペトログラフィック分析.
主要な成果:
- 衝突前の岩石の位置を再構築し,中央の上昇の最上位200メートルで約5ギガパスカルの衝撃減衰を明らかにしました.
- 衝撃圧の敏感な指標として,衝撃を受けたクォーツ粒子の割合と平面変形の特徴を特定しました.
- 柔らかな変形ではなく,脆性の欠陥が,中等サイズのクレーターにおける中央の上昇形成を支配していることを実証した.
結論:
- 複雑なクレーターにおける衝撃波減衰は,衝撃変形指標を使用して定量化することができます.
- 中等サイズの衝突構造における中央上昇形成は,主に脆い故障メカニズムによって制御されます.
- この研究は,インパクトクレーターの進化を理解するための洗練されたモデルを提供します.
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