Influence of a tundra freeze-thaw cycle on sulfide oxidation and metal leaching in a low sulfur, granitic waste rock

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• 作者：Jeff B. Langman^a ; ^b ; ^{jlangman@uidaho.edu} ; David W. Blowes^b ; Richard T. Amos^c ; Colleen Atherton^b ; David Wilson^b ; Leslie Smith^d ; David C. Sego^e ; Sean A. Sinclair^b
• 关键词：Freeze-thaw cycle ; Sulfide oxidation ; Metal leaching ; Differential weathering ; Enrichment zone
• 刊名：Applied Geochemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：76
• 期：Complete
• 页码：9-21
• 全文大小：3509 K
• 卷排序：76

文摘

The freeze-thaw cycle of a tundra climate causes differential sulfide weathering within waste rock. Vertical and horizontal weathering fronts were identified from pyrrhotite alteration. Differential weathering produced a spatial distribution of metal forms. A seasonal frozen surface likely retained leachate causing a nickel and sulfur enrichment zone. The tundra climate induces a seasonal cycle of metal sulfide weathering and element mobilization.