異常な金属に富んだ液体は,水熱鉱石の鉱床を形成する
Jamie J Wilkinson1, Barry Stoffell, Clara C Wilkinson
1Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, Exhibition Road, London SW7 2AZ, UK. j.wilkinson@imperial.ac.uk
まとめ
水熱鉱石の鉱床は,金属に富んだ液体から形成されます. スファレライトの液体インクルージョンを分析すると,以前に理解されていたよりもはるかに高い金属濃度が明らかになり,鉱石形成の既存のモデルに挑戦しました.
科学分野:
- 地質化学 地質化学
- 経済地質学 経済地質学
- ミネラロジーは,鉱物学です.
背景:
- 水熱鉱石堆積物は,地殻の金属を沈殿する水溶液から形成されます.
- シリケート/炭酸塩の液体含有物は,伝統的に鉱石形成液体の研究に情報を与えています.
- このパラダイムは,インクルージョンが鉱石を沈殿させるソリューションを反映していると仮定しています.
研究 の 目的:
- 鉱石形成流体分析のために伝統的な流体インクルージョンを使用するパラダイムをテストする.
- 亜鉛鉱石システムからのスファレライト内の流体インクルージョンの金属濃度を調べる.
主な方法:
- レーザーアブレーション誘導結合プラズマ質量スペクトロメトリー (LA-ICP-MS).
- 2つの異なる亜鉛鉱石鉱床からのスファレライトに宿る流体インクルージョンの分析.
主要な成果:
- スファレライトが宿る液体インクルージョンの金属濃度は,クォーツが宿るインクルージョンよりも最大2倍の大きさです.
- 観測された金属含有量は,以前に報告された値を大幅に超えています.
- これは,鉱石の形成が金属に富んだ液体の流入と関連していることを示している.
結論:
- シリケート/カーボネート主体の流体インクルージョンを使用する伝統的なパラダイムは,鉱石流体の金属含有量を過小評価する可能性があります.
- 鉱石形成システムには,金属に富んだ流体の偶発的な流入が伴う可能性が高い.
- スファレライトに宿る流体インクルージョンは,鉱石形成流体化学のより正確な表現を提供します.
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