まとめ
酸性湖の孔水に溶けた亜鉛は,不溶性硫化物を形成し,堆積物に堆積する. 地下亜鉛ピークは,湖の酸性化だけでなく,ダイアゲネティックなプロセスを示す可能性があります.
科学分野:
- 環境化学 環境化学
- 地質化学 地質化学
- リムテクノロジーとは
背景:
- 酸性湖は,水と無酸素の孔水の間に,溶けた亜鉛の急なグラデーションを示します.
- 無酸素の孔水における亜鉛濃度の低さは,不溶性亜鉛硫化物鉱物の形成を示唆する.
研究 の 目的:
- 酸性湖の堆積物中の溶けた亜鉛の運命を調査するために.
- 亜鉛の堆積に下向きの拡散性流の寄与を決定する.
- 湖の堆積物における地下亜鉛マキシマムの原因を調査する.
主な方法:
- 溶けた亜鉛濃度の分析,上下水と無酸素の孔水.
- 溶けた亜鉛の向下拡散フローの定量化.
- 沈殿体内における全亜鉛分布の観測.
主要な成果:
- 溶けた亜鉛の下向きの拡散流は,最近の亜鉛堆積に50-75%の貢献をします.
- 総亜鉛の顕著な地下の最大値は,堆積物-水界面より2-3cm下に見られる.
- これらの地下亜鉛ピークは,最近の湖酸性化とは無関係なダイアゲネティック活動の結果である可能性があります.
結論:
- 硫化亜鉛の降水は,無酸素の孔水の亜鉛濃度を制御する重要なプロセスです.
- 最近の酸性化とは無関係なダイアゲネティックなプロセスは,湖の堆積物の中に地下亜鉛のピークを作り出すことができます.
- 亜鉛ダイアゲネシスの理解は,酸性湖の堆積物記録の解釈に極めて重要です.
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