マフィカルマグマの拡散性同位体汚染は,マスコックス侵入における共存するシリコン液体によって引き起こされる
まとめ
ムスコックスの侵入における同位体比は,マグマ層間の化学的および同位体交換の分離を明らかにする. この拡散汚染プロセスは,数千年にわたってマグマ室内のシリケート液体に大きな影響を及ぼします.
科学分野:
- 地質化学 地質化学
- イグネウス Petrology (イグネウス・ペトロロジー) とは,イグネウス・ペトロロジー (イグネウス・ペトロロジー) とは
- イソトープ地球化学 イソトープ地球化学
背景:
- 層層のマフィック侵入は,マグマ室のプロセスに関する洞察を提供します.
- マグマの混合と分化を理解することは,地質学的記録の解釈に不可欠です.
- 同位体シグネチャー (ストロンチウムとネオジミウム) は,マグマの進化の強力なトレーサーである.
研究 の 目的:
- 層状マグマ系における同位体と大量化学交換の分離を調査する.
- マフィックとシリシックの液体界面の間の拡散交換の効果をモデル化するために.
- マグマ室の進化を制御する時間スケールと物理的プロセスを制限するために.
主な方法:
- Muskox侵入からの累積物における (87) Sr/ (86) Srおよび (143) Nd/ (144) Nd比の分析.
- 層状の液体層間の拡散交換をシミュレートする数値モデルの開発.
- モデル予測と観測された同位体変動の比較.
主要な成果:
- (87) Sr/ (86) Srと (143) Nd/ (144) Ndの比率の観測されたシフトは,切り離された交換を示しています.
- モデリングは,拡散交換が10 ^ 3から10 ^ 4年間で同位体組成を大幅に変化させることを示しています.
- このプロセスは,異なる液体界面を持つ層状マグマ室で特に効果的です.
結論:
- 拡散汚染は,マグマ系における同位体シグネチャに影響を与える重要なプロセスである.
- このメカニズムは,層状の侵入における同位体異質性を説明するのに役立ちます.
- この研究は,マグマ室のダイナミクスと時間スケールを制限するために拡散汚染を使用するための枠組みを提供します.
関連する概念動画
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