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パレオゾイク時代の海面変化の年代表
Bilal U Haq1, Stephen R Schutter
1National Science Foundation, Arlington, VA 22230, USA. bhaq@nsf.gov
Science (New York, N.Y.)
|October 4, 2008
まとめ
この研究は,古生紀の海面を再構築し,長期の傾向と172のユースタティックイベントを明らかにしました. 海水位は,ヒルナント氷河のような出来事の影響で,最大125メートルの大きさで,著しく変動しました.
科学分野:
- パレオントロジー・パレオントロジー
- ストラティグラフィー ストラティグラフィー
- パレオセアノグラフィーとは
背景:
- パレオゾーイク時代の海平面の歴史は,まだ完全に統合されていない.
- 以前の研究では,特定の期間に焦点を当て,包括的な概要が欠けていました.
- 過去の海面の変化を理解することは,古気候と地質学の再構築に不可欠です.
研究 の 目的:
- パレオゾーイク時代全体における海面変動の包括的な歴史を再構築する.
- 個々のエウスタティック現象とその大きさを特定し,記録する.
- 長期の海面上昇傾向とその要因を分析する.
主な方法:
- ペリカートン盆地とクラトン盆地からの地層学断面を利用した.
- 個々の海面イベントの評価されたタイミングと振幅.
- パレオゾーイクにおける統一された海平面曲線を確立するための統合データ.
主要な成果:
- パレオゾイク全体で172のユースタティックイベントを記録した.
- カンブリア時代からオルドビキア期末の頂点までの長期の海面上昇を特定した.
- ヒルナンティウスの氷河期における撤退や,その後の高低をはじめ,海面の大きな変動を観測した.
- 海面の変化の大きさは数十メートルから約125メートルまで変化した.
結論:
- パレオゾーイク時代の詳細な海面の歴史が確立されています.
- 海平面の変動は,氷河期と地質学的な活動によって影響を受け,ダイナミックでした.
- 海面の変化の大きさを正確に推定することは,依然として課題です.
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