Reykjanesの"V"形の山脊は,パルスと脱水するマントルの羽根から発生しています
1Department of Geology, University of California, Davis 95616, USA. gito@geology.ucdavis.edu
Nature
|June 8, 2001
まとめ
新しい地力学モデルがアイスランドについて説明しています.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- マントルの羽根ダイナミクス マントルの羽根ダイナミクス
- アイスランドの地質学
背景:
- アイスランドの南にあるレイクヤネス山脈に沿って,顕著なV形地殻の線が観察されています.
- これらの特徴は,マグマ生成の時間的変動と,アイスランド・プルーム・マテリアル・フローの,リッジ・アックスに沿った変動と関連している.
研究 の 目的:
- V形地殻の脊椎の形成を説明する地力学モデルを提示する.
- これらの特徴を生成する脈動し,放射的に流れるマントルの羽根の役割を調査する.
主な方法:
- マントルの羽根の行動と地殻との相互作用をシミュレートするジオダイナミックモデルの開発.
- 羽根パルスとマントルの粘度が地殻の厚さや重力の異常にどのように影響するかについての分析.
主要な成果:
- このモデルは,放射的に膨張するマントルの羽根パルスによって形成されたV形の脊を予測しています.
- 融解ゾーンの高い粘度が地殻の変動に対応し,羽根材料の好ましい軸向チャネリングを防ぐ.
- V形状の特徴の角度は,斜面の羽根の流れが山脊の広がり速度を超えていることを示しています.
結論:
- 脈動し,放射的に流れるマントルの羽根は,レイクヤネス山脊の観測されたV形地殻の線形を生成することができます.
- このモデルは,地殻の厚さ,重力の異常,そして羽根-山頂相互作用の観測を調和させています.
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