サドベリー構造から得られた地質化学的証拠は,大ボリドの衝突によって地殻の再分配があったことを示している
James E Mungall1, Doreen E Ames, Jacob J Hanley
1Department of Geology, University of Toronto, 22 Russell St, Toronto, Ontario M5S 3B1, Canada. mungall@geology.utoronto.ca
Nature
|June 4, 2004
まとめ
大きな小惑星の衝突は,地球の初期の地殻を大幅に変化させ,サドベリーの構造は,平均的な地殻材料ではなく,地殻の下部から派生した融解板を明らかにしました. これは,インパクトの逆転した地殻層と混合材料を示唆しています.
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.
- 地質化学 地質化学
背景:
- 大規模衝突クレーター形成の際に地殻の変形と融解は,初期の地球進化に不可欠ですが,理解は不十分です.
- 18億年前のサドベリー構造は,希少で完全な衝突セクションを提供しています.
研究 の 目的:
- サドベリー・イグネウス・コンプレックス・メルトシートの構成と起源を調査する.
- 大陸の地殻の層化に及ぼす超高速衝撃の影響を理解するために.
主な方法:
- サドベリー・イグネウス・コンプレックスとオナピング・フォーメーションの地化学分析.
- プラチナグループ元素の豊富度分析.
主要な成果:
- サドベリー溶融板は,主に下部大陸の地殻から派生しており,以前の仮定に異議を唱えている.
- オナピング形成のマトリクスは,堆積層,地殻下部の溶融,インパクター物質の混合物です.
- 衝突は大陸の構成層を部分的に逆転させた.
結論:
- 超高速の衝撃は,大陸の地殻の組成層を大幅に変化させ,逆転させることができます.
- サドベリー衝突は,地球や他の地表惑星の大規模な地殻改変プロセスに関する重要な洞察を提供します.
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