広範囲にわたるアクティブ・デタッチメント・フォールティングとコア・コンプレックス・フォーメーションは,北緯13度近くの中大西洋のリッジにある
Deborah K Smith1, Johnson R Cann, Javier Escartín
1Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA. dsmith@whoi.edu
Nature
|July 28, 2006
まとめ
海洋の中核複合体は,海洋中部の山脊の分離断層から形成されます. この研究は,ミッド・アトランティック・リッジのこれらの地質学的特徴の活発な断層と進化を明らかにしています.
科学分野:
- 地質学 地質学 地質学
- 海洋地球物理学 海洋地球物理学
- テクトニクス (地質学) とは
背景:
- 海洋コア複合体は,海底の下層地殻と上層マントルの岩石を露出させる.
- 中洋の山脊の下にある分離断層から発生します.
- 以前の研究は,不活性で古い複合体,拡散軸から離れたものに焦点を当てていた.
研究 の 目的:
- 中大西洋山脊沿いの活発な海洋核複合体の形成を調査する.
- 活性複合体の地形特性と進化の段階を記録する.
- 脱離断層形態学と地震性を相関させるため.
主な方法:
- 北13度近くにある中大西洋山脈の地質学的調査.
- リンクされた分離欠陥と関連するコア複合体のマッピング.
- 海底の形態学的分析と水音学的に記録された地震性.
主要な成果:
- 75kmのアクティブでリンクされた分離断層のセグメントが特定されました.
- 絶滅したコア・コンプレックスは,山脊軸から少なくとも100kmに及ぶ.
- 分離断層形態学と高い地震地震率との間には相関関係がある.
結論:
- アクティブ・デタッチメント・フォールティングは,ゆっくり広がる山脊の海殻生成に極めて重要です.
- この研究は,コア複合体の開始,開発,不活性化についての洞察を提供します.
- 脱離断層の断層は,こののタイプについて,これまで考えられていたよりも大きく見えます.
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