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Updated: Jul 13, 2026

10:44
Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
Published on: July 1, 2016
合成液体インクルージョンで測定された超臨界水熱塩水における黄金の溶解度
1Research School of Earth Sciences, Department of Geology, Australian National University, Canberra, A.C.T. 0200, Australia.
まとめ
超臨界塩水における金の溶解性は,以前考えられていたよりも,特に硫化物種において,著しく高い. 高圧は,硫化水素のような溶けたガスの金属複合効果を高めます.
科学分野:
- 地質化学 地質化学
- 経済地質学 経済地質学
- 高圧/高温実験ペトロロジー
背景:
- 地質学的流体における金の溶解性を理解することは,鉱石鉱床の探査に不可欠です.
- 以前の研究では,特定の条件下で熱水システムで限られた金輸送が示唆されていました.
研究 の 目的:
- 高温および高圧下での塩化塩水中の溶けた金の濃度を実験的に決定する.
- 黄金の輸送における硫化物種と溶けたガスの役割を調査する.
主な方法:
- 金と関連する鉱物 (磁石,硫化物,フィールドスパート,ミカ) との塩漬けの実験的飽和.
- 誘導結合プラズマ質量スペクトロメトリ (LA-ICP-MS) を使用した流体インクルージョン微分析.
- 実験は550〜725°C,100〜400MPaで実施した.
主要な成果:
- 超臨界塩水における金の溶解性は,以前に推定されたよりも大幅に高い.
- 硫化物の複合化により,実験条件下で金の溶解性が著しく向上します.
- 溶解したガス,特に硫化水素は,高圧下では非常に効果的な金属複合剤になります.
結論:
- 硫化物種は,高圧深層水熱系における高金濃度のための重要な結合体である.
- 金鉱床の形成に関する地質学的なモデルは,金鉱床の深さでの溶解性の向上を考慮する必要があります.
- 高圧条件は,地質流体における金属の特異化と複合化行動を劇的に変化させる.
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