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火星半球二分法のメガインパクト形成
Margarita M Marinova1, Oded Aharonson, Erik Asphaug
1California Institute of Technology, Division of Geological and Planetary Sciences, MC 150-21, Pasadena, California 91125, USA. mmm@caltech.edu
Nature
|June 27, 2008
まとめ
単一のメガインパクトは,火星の半球二分法を説明するかもしれない. シミュレーションでは,角度やエネルギーを含む特定の衝撃条件が,南部の高地と北部の低地間の観測された地殻の違いを生じさせることが示されています.
科学分野:
- 惑星科学は惑星科学である.
- 地質物理学 地質物理学とは地質物理学です.
- インパクトクラテリング (インパクトクラテリング)
背景:
- 火星半球の二分論は,半球間の高さと地殻の厚さの激しいコントラストであり,まだ十分に理解されていません.
- エンドジェニックコンベクションや複数の衝撃などの既存の形成モデルには,限界や統計的不可能性があります.
研究 の 目的:
- 火星半球二分論の起源に関する単一のメガインパクト仮説を調査する.
- 観測された二分法と一致する特徴を生成できる衝撃条件をモデル化するために.
主な方法:
- 単一の大きな衝撃イベントをモデル化するために3次元水力力学シミュレーションを使用しました.
- 衝撃後の状態への影響を評価するために,さまざまな衝撃エネルギー,速度,角度.
主要な成果:
- シミュレーションによると, (3-6) x 10(29) Jのエネルギーと低速度 (6-10 km/s) の斜面衝突 (30-60°) は,北部の低地規模と円性に一致する地殻除去境界を生成することができる.
- これらの条件下での融解の分布は主に局所化しており,衝撃の証拠を保存しています.
結論:
- 単一のメガインパクトイベントは,火星半球二分論の実行可能な説明です.
- タイミングと衝突角度は,初期の太陽系条件とインパクター集団と一致しています.
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