フィジーの下には,大量に浸透した石層が残っている証拠があります
1Department of Geology, University of Illinois, Urbana, IL 61801, USA. w-chen@uiuc.edu
まとめ
トンガ・バック・アークの下の深い地震は,ワダティ・ベニオフ・ゾーンと相互作用する分離したスラブによって説明される. この相互作用によって,原始的なマントルの物質が保存されることがあります.
科学分野:
- 地質物理学 地質物理学とは地質物理学です.
- 地震学 地震学とは
- テクトニクス (地質学) とは
背景:
- トンガのバック・アークは,複雑な地震性と断層パターンを示しています.
- 潜水石層のダイナミクスを理解することは,マントルの進化の研究に不可欠です.
研究 の 目的:
- トンガのバック・アーチの下の沈殿した石層と深い地震の性質を調査します.
- 地質学的データを用いて複雑な地震パターンを説明する.
主な方法:
- P波とS波の速度を組み合わせた分析.
- 1000の故障平面ソリューションを使用しました.
- 6600個の明確に定義された下心部が組み込まれました.
主要な成果:
- 崖っぷちのワダティ・ベニオフ・ゾーンと,分離した亜水平板の並列が確認された.
- 切り離された板は,化石のヴィティアズ溝 (5-800万年前) から来た可能性がある.
- この構成は,マントルの移行領域に潜水した物質を閉じ込めます.
結論:
- 離散型板模型は,観測された地震性および断層平面の解決策を説明します.
- このプロセスは,下層マントルの原始物質の保存につながる可能性があります.
- このようなスラブ構成が一般的であり,初期の地球マントルの組成に影響を与えることを示唆しています.
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