マントルの溶融分数の変化によって調節される大陸裂のエピソード動力学
Simon Lamb1, James D P Moore2, Euan Smith1
1Institute of Geophysics, Victoria University of Wellington, Wellington, New Zealand.
Nature
|July 7, 2017
まとめ
ニュージーランドからの地質GPSデータ
科学分野:
- 地理学
- 構造学
- 火山学
背景:
- マントルの岩が溶ける海底の広がりの中心で形成される
- 海底のマントルの融解を 直接観察することは困難です
- 大陸の断層は地質データを用いてマントルの融解を研究する機会を提供します.
研究 の 目的:
- マントルの流れと融解の過程を推測するために,大陸の裂け目を用いた地質データを用いる.
- マントルの上流と融解のダイナミクスを調査する.
- マントルのプロセスと表面変形の間の関係を理解する.
主な方法:
- ニュージーランドのタウポ火山地帯での10年間のキャンペーンと連続したGPS測定の分析.
- 観測された地殻変形を説明するために,屈曲モデルを適用する.
- マントルの上流と融解のダイナミクスの文脈における地質学的データの解釈
主要な成果:
- タウポの火山地帯は年間6~15ミリメートル伸びている.
- 70kmの断片は水平収縮と沈没を示し,その横には上昇と拡張があります.
- これらの特徴は,地殻の屈曲に影響を与える上流マントルのエピソード的,溶融誘発力と一致しています.
結論:
- 大陸の裂け目から得た地質学的なデータは,海洋の広がりの中心に関するマントルの融解過程の洞察を提供します.
- マントルの溶解分数のエピソード的な変化は,一時的な下層地殻の流れと表面変形を引き起こします.
- この研究は,地球深層のプロセスを理解する上で,地質学的手法の有用性を示しています.
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