まとめ
ノルウェーの偽タキライト.
科学分野:
- 地質学 地質学 地質学
- テクトニクス (地質学) とは
- ペトロロジー・ペトロロジーとは
背景:
- 偽タキライトは,通常,地震断層の際に摩擦による融解によって形成されます.
- ベルゲン弧におけるそれらの発生は,深層の地殻の過程についての洞察を提供します.
研究 の 目的:
- ベルゲン弧におけるシドオタキライト形成の起源と条件を調査する.
- プシドタキライトの発生におけるエコロギチゼーションの役割を理解する.
主な方法:
- プシドタキリート微石 (オンファサイト,ガーネット,プラジオクラゼ,クォーツ) のペトログラフィック分析.
- 安定した鉱物集合体とP-T条件を決定するための熱力学モデリング.
主要な成果:
- 偽タキライトにはエクロジット面鉱物が含まれており, ~800°Cと18-19 kbar (深さ>60 km) で形成されたことを示しています.
- これらの岩は,カレドニアのオロゲニー (orogeny) 期間に流体誘発によるエコロギチゼーションを経験したグレンヴィリアの粒岩に含まれています.
- エクロジチゼーションにより,宿主岩の体積が約10%減少した.
結論:
- 疑似タキライトは,流体誘発によるエコロギチゼーションによる急速なストレス緩和から形成された可能性が高い.
- この研究は,深層地殻の液体活動,相変換,地震断層の間の関連性を示唆しています.
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