東南極と西南極の間のケノゾイク運動
1Scripps Institution of Oceanography, La Jolla, California 92093-0215, USA. scande@ucsd.edu
Nature
|March 21, 2000
まとめ
新しい研究により,東南極と西南極は,エオセーンとオリゴセーン時代に約180kmの距離が隔てられていたことが明らかになった. この西南極裂け目システムの開発は,重要な構造的出来事を説明し,地球板の運動モデルを洗練します.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- プレート・テクトニクス (プレート・テクトニクス)
- パレオジオグラフィー パレオジオグラフィー
背景:
- 西南極裂け目系は,メソゾーイクとケノゾーイク時代の東南極と西南極の間の延長から形成された主要な活動的な大陸裂け目である.
- 裂け目システムの発展に関する以前の理解は,海底の広がりの制約,特に磁気異常と断裂ゾーンのデータがないことによって制限されていました.
研究 の 目的:
- 西南極裂け目システムの形成に起因するプレート運動のタイミングと大きさを決定する.
- オーストラリア・南極・太平洋プレートを含むプレート回路の再構築を改善する.
主な方法:
- 南タスマン海と北ロス海で収集された磁気データ,重力データ,スワットバチメトリーの分析.
- 東南極と西南極のケノゾイク期中期の回転パラメータの計算.収集された地質学的データに基づいて.
主要な成果:
- 東南極と西南極の間の約180kmの分離の証拠は,エオセーンとオリゴセンの間,ロス海の西部の湾岸にある.
- 東南極と西南極のケノゾイク期中期の回転パラメータを確立した.
- ニュージーランド地域の初期の三次元の再構築における不一致を解決し,南極の変形が地球板回路に与える貢献を明らかにした.
結論:
- 計算された東西南極の移動は,南極大陸を越えた山脈の上昇と広範なオリゴセンの堆積物堆積を含む,ロス海の海域における重要なケノゾイク時代の出来事の構造的枠組みを提供します.
- この運動を組み込むことは,プレート再構築を精錬し,太平洋プレート相互作用に関する長年の論争を解決します.
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