マグマが少ない大陸の縁の進化は,裂け目から海底に広がり,海底に広がります
R B Whitmarsh1, G Manatschal, T A Minshull
1Southampton Oceanography Centre, European Way, Southampton, SO14 3ZH, UK. rbw@soc.soton.ac.uk
Nature
|September 15, 2001
まとめ
大陸の裂け方は,テクトニズムとマグマティズムの別々のモデルを含んでいます. 新しい研究は,発掘された大陸マントルのゾーンを明らかにし,大陸と海洋の地殻を分解する際に橋渡ししている.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- テクトニクス (地質学) とは
- 地質学 地質学 地質学
背景:
- 大陸の裂け目モデルでは,しばしばテクトニズムとマグマティズムを別々に扱います.
- 大陸の崩壊,融解,そして海底の広がりへの進化をシミュレートするモデルはほとんどありません.
- 従来のモデルは,大陸と海洋の地殻を並べている.
研究 の 目的:
- マグマが少ない裂け目縁の掘り出された大陸マントルのゾーンを支持する観測を提示する.
- 大陸の拡大と分裂の最終段階のための概念モデルを提案する.
- 海底の広がりへの大陸裂けの進化を記述する.
主な方法:
- 西イベリアマージンからの地質学的および地質学的観測.
- アルプス山脈の旧テティス海の海辺の地質学的な地図作成.
- フィールド観測に基づく概念モデルの開発.
主要な成果:
- 大陸と海洋の地殻の間の,数十キロメートル幅の,発掘された大陸のマントルのゾーンの証拠.
- 西イベリアとアルプスの観測は,このモデルを支持する.
- 大陸の崩壊の最終段階を図解する概念モデル.
結論:
- 大陸の崩壊は,発掘された大陸のマントルのゾーンが,海底の広がりへと進化することを意味します.
- ストレスと熱場は,上昇するアステノスフィアのマントルによって制約されます.
- マグマティズムと拡張率は,海に向かって体系的に増加します.
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