マントル由来の溶融の源における再利用された地殻の量
Alexander V Sobolev1, Albrecht W Hofmann, Dmitry V Kuzmin
1Max Planck Institute (MPI) for Chemistry, Post Office Box 3060, 55020 Mainz, Germany. sobolev@geokhi.ru
まとめ
リサイクルされた海洋地殻 (エクロジット) はマントルの融解に大きく影響し,ハイブリッド型ピロキセナイトを生み出します. オリビンフェノクリスタ分析は,このリサイクルされた地殻の貢献を,様々な玄武岩種とコマチートで定量化します.
科学分野:
- 地質化学 地質化学
- ペトロロジー・ペトロロジーとは
- テクトニクス (地質学) とは
背景:
- プレートテクトニクスは,玄武岩の海洋地殻 (エクロジット) を地球の大気マントルに再利用する.
- マントルの溶融に対するエクロジットとペリドチットの相対的な貢献は,十分に制限されていません.
研究 の 目的:
- エクロジット由来の溶融とペリドートイットの相互作用によって生じるマントルの溶融の化学的進化を調査する.
- 異なる種類のマントルの溶融を生成するのに関与するリサイクルされた地殻物質の割合を定量化するために.
主な方法:
- 様々な玄武岩やコマチートにおけるオリヴィン・フェノクリスタの組成を分析した.
- ハイブリッドピロキセナイトから派生した部分溶融の化学シグネチャーのモデリング.
主要な成果:
- エクロジット・ペリドート反応産物 (ハイブリッド・ピロクセニート) の部分溶解は,NiとSiで濃縮されているが,ペリドート溶解と比較してMn,Ca,Mgが乏しい.
- オリビンのフェノクリストの組成は,海中山脊の玄武岩 (10-30%),海洋島と大陸の玄武岩 (>60%),コマチート (20-30%) のピロクセニット由来の溶融の有意な貢献を示しています.
結論:
- この研究では,マントルの融解におけるリサイクルされた地殻の関与を,2%から20% (最大28%) の範囲で定量化しています.
- オリビンのフェノクリスタ化学は,マントル由来マグマのリサイクルされた地殻成分のための信頼できるトレーサーとして機能します.
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