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ポルフィール型鉱石の鉱床におけるCu/Au比の起源

Werner E Halter¹, Thomas Pettke, Christoph A Heinrich

¹Isotope Geochemistry and Mineral Resources, Department of Earth Sciences, Swiss Federal Institute of Technology (ETH), ETH Zentrum NO, 8092 Zürich, Switzerland. halter@erdw.ethz.ch

Science (New York, N.Y.)

|June 8, 2002

まとめ

磁性硫化物液は,銅や金などの主要金属を濃縮することによって,ポルフィール鉱石の鉱床組成に直接影響します. これらの金属は後に熱水流体に放出され,鉱石の比率を制御します.

科学分野:

地質化学地質化学
経済地質学経済地質学
ペトロロジー・ペトロロジーとは

背景:

ポルフィール型鉱石の鉱床は,銅や金などの金属の重要な供給源である.
これらの鉱床における金属の正確な起源と進化は,現在も活発な研究の対象となっている.
マグマ的過程の役割を理解することは,探査と資源評価において極めて重要です.

研究の目的:

磁性硫化物液とポルフィール型鉱石の鉱床の元素組成との直接的な関連を調査する.
金属 (Cu,Au,Fe) の濃度と,マグマの進化過程で放出するメカニズムを決定する.
マグマ硫化物溶融の進化が鉱石鉱床における経済的金属比率に及ぼす影響を評価する.

主な方法:

硫化物およびシリケート溶融の含有物における主要元素および微量元素の微小分析.
誘導結合プラズマ質量スペクトロメトリ (LA-ICP-MS) によるレーザーアブレーションを用いる.

主要な成果:

マグマ硫化物の液体組成とポルフィール型鉱石鉱床の特性との間には直接的な相関が確立されました.
銅,金,鉄は,マグマ進化の過程で硫化物溶液に濃縮されていることが判明しました.
これらの金属は,マグマの歴史の終わりに水熱流体に放出されます.
マグマ硫化物液体の組成は,マグマ源と地殻の進化によって影響を受けます.

結論:

マグマ硫化物液は,ポルフィール型鉱石鉱床の経済的金属比率を制御する上で重要な役割を果たします.
マグマと関連する硫化物溶融の進化は,鉱石形成の可能性を直接決定する.
この研究は,主要な金属資源の起源に関する重要な洞察を提供します.

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