連続断層は,結合縁の非対称性と拡張不一致を説明する
César R Ranero1, Marta Pérez-Gussinyé
1ICREA at CSIC, Barcelona Center for Subsurface Imaging, Instituto de Ciencias del Mar, CSIC, Passeig Marítim de la Barcelona 37-49, 08003, Barcelona, Spain. cranero@icm.csic.es
Nature
|November 5, 2010
まとめ
断層の縁は,大陸の石層の薄めから形成されます. この研究は,検出されていない変形ではなく,断層制御された薄めを示し,裂け目の盆地と結合した縁の構造を説明することによって,拡張不一致を解決します.
科学分野:
- 地質学 地質学 地質学
- テクトニクス (地質学) とは
- 地質物理学 地質物理学とは地質物理学です.
背景:
- コンチネンタル・リトスフィアの薄めと沈着は,早期の拡張時にリフト盆地を作り出します.
- 継続的な拡張はプレート崩壊につながり,結合した裂け目の縁を形成します.
- 盆地から縁部への変形プロセス,および拡張不一致 (地殻の薄め > 脆い断層) は不明のままです.
研究 の 目的:
- 大陸の裂け目発生時に地殻の薄れに起因する変形過程を調査する.
- 裂け目盆地と結合縁で観察された"拡張不一致"を解決するために.
- 結合縁の非対称構造を説明する運動モデルを開発する.
主な方法:
- 断層の拡張を正確に測定するために,深度移住の地震画像を使用しました.
- 測定された断層拡張を,観測された地殻の薄めと比較した.
- 地震観測に基づいたリフティングのバランスのとれた運動モデルを開発した.
主要な成果:
- 精密な地震測定により,断層の拡大が明らかにされ,地殻の薄れが説明される.
- 開発された動力学モデルは,拡張不一致を解決する.
- このモデルは,断層流域から非対称な結合縁まで進行する断層制御による薄化を説明している.
結論:
- 大陸の裂け目と結合縁の形成は,主に目に見えるアンダーソンの断層によって説明される.
- 延伸の不一致は,検知されていない変形ではなく,故障制御された薄めを考慮することによって解決されます.
- これは,裂け流域の進化と結合縁の非対称性についての新しい理解を提供します.
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