まとめ
マグマ硫化物におけるプラチナ系元素 (PGE) の濃度は,マグマの親マグマと関連している.
科学分野:
- 経済地質学 経済地質学
- 地質化学 地質化学
- ミネラル埋蔵地
背景:
- プラチナ系元素 (PGE) は,重要な産業用金属である.
- PGEの堆積物は主に分離された鉄・ニッケル・銅硫化物溶液から形成される.
- 硫化物中のPGE濃度は,他のカルコフィール元素とは異なり,大きく異なる.
研究 の 目的:
- マグマ硫化物内のPGE濃度の変動を説明するために.
- PGEの比率と親マグマの特性との関係を確立するために.
- 鉱石埋蔵地におけるPGE分布を制御する地質学的プロセスを調査する.
主な方法:
- 様々な堆積物におけるマグマ硫化物におけるPGE濃度の分析.
- PGEの相対比率と母性マグマの組成の相関.
- 部分溶解,バッチ均衡,分断分離のプロセスのモデリング.
主要な成果:
- 硫化物中のPGE濃度には5つの大きさがあります.
- 相対的なPGE比率は,親マグマタイプと体系的に相関しています.
- マントルの部分融解と硫化物分離プロセスの程度は,観測された濃度を説明する.
結論:
- PGEが豊富なマグマ硫化物堆積物の形成は,マントルの融解度と硫化物分離によって制御されます.
- これらのプロセスを理解することは,新しいPGE資源を探索する鍵です.
- 特に北米 (例えば,スティルウォーター複合体) において,重要な未開発のPGE資源が存在する.
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