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Iron Isotope Fractionation by Biogeochemical Processes in Mine Tailings

机译：尾矿中生物地球化学过程分离铁同位素的研究

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Iron isotope ratios were determined for the pore water, the 1 M HCl/1 M hydroxylamine hydrochloride (HAH)-extractable solid phase, and the total extractable solid phase from sulfidic mine tailings in Impoundment 1, Kristineberg mine, northern Sweden. Within the tailings, pyrite oxidation occurs in a distinct Fe-depleted oxidation zone, and the greatest number of Fe(Ⅱ)-oxidizing bacteria in the profile occur close to the boundary between oxidized and unoxidized tailings. Above the oxidation front in the oxidized tailings, a large iron isotope fractionation (-1.3 to -2.4%) is measured between the pore water and the HAH-extractable solid phase. This isotope fractionation is explained by aqueous Fe(Ⅱ)—Fe(Ⅲ) equilibrium, microbial Fe(Ⅱ) oxidation, and Fe(Ⅲ) oxyhydroxide precipitation. The data suggests that pyrite in the tailings is enriched in ~(56)Fe relative to Fe-rich silicates in the same material, such that pyrite oxidation results in a decrease in the mean δ~(56)Fe value for the bulk tailings in the oxidized zone: a change in isotope composition that is not attributable to isotope fractionation. Iron isotope analyses yield valuable information on iron cycling in mine wastes, and they have the potential for becoming a tool for the prediction and control of acid mine drainage.
机译：确定了孔隙水，1 M HCl / 1 M盐酸羟胺（HAH）可萃取的固相以及瑞典北部克里斯蒂安贝格矿区Impoundment 1的硫化矿尾矿中总可萃取固相的铁同位素比。在尾矿中，黄铁矿氧化发生在一个明显的贫Fe氧化带中，并且剖面中最大数量的Fe（Ⅱ）氧化细菌出现在氧化和未氧化尾矿之间的边界附近。在氧化尾矿的氧化前沿上方，在孔隙水和可萃取HAH的固相之间测得较大的铁同位素分馏（-1.3至-2.4％）。 Fe（Ⅱ）-Fe（Ⅲ）水溶液平衡，微生物Fe（Ⅱ）氧化和羟基氢氧化Fe（Ⅲ）沉淀解释了这种同位素分馏。数据表明，相对于同一材料中富铁的硅酸盐而言，尾矿中的黄铁矿富含〜（56）Fe，因此黄铁矿的氧化导致大块尾矿中平均δ〜（56）Fe值降低。氧化区：同位素组成的变化，这不归因于同位素分馏。铁同位素分析可提供有关矿山废料中铁循环的有价值的信息，它们有潜力成为预测和控制酸性矿山排水的工具。

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