Item talk:Q309675

From geokb

{

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   "name": "Application of iron and zinc isotopes to track the sources and mechanisms of metal loading in a mountain watershed",
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   "abstract": "Here the hydrogeochemical constraints of a tracer dilution study are combined with Fe and Zn isotopic measurements to pinpoint metal loading sources and attenuation mechanisms in an alpine watershed impacted by\u00a0acid mine drainage. In the tested mountain catchment,\u00a0\u03b456Fe and\u00a0\u03b466Zn isotopic signatures of filtered stream water samples varied by \u223c3.5\u2030 and 0.4\u2030, respectively. The inherent differences in the aqueous geochemistry of Fe and Zn provided complimentary isotopic information. For example, variations in\u00a0\u03b456Fe were linked to redox and precipitation reactions occurring in the stream, while changes in\u00a0\u03b466Zn were indicative of conservative mixing of different Zn sources.\u00a0Fen\u00a0environments contributed distinctively light dissolved Fe (<\u22122.0\u2030) and isotopically heavy suspended Fe precipitates to the watershed, while Zn from the fen was isotopically heavy (>+0.4\u2030). Acidic drainage from\u00a0mine wastes\u00a0contributed heavier dissolved Fe (\u223c+0.5\u2030) and lighter Zn (\u223c+0.2\u2030) isotopes relative to the fen.\u00a0Upwelling\u00a0of Fe-rich groundwater near the mouth of the catchment was the major source of Fe (\u03b456Fe\u00a0\u223c\u00a00\u2030) leaving the watershed in surface flow, while runoff from\u00a0mining wastes\u00a0was the major source of Zn. The results suggest that given a strong framework for interpretation, Fe and Zn isotopes are useful tools for identifying and tracking metal sources and attenuation mechanisms in mountain watersheds.",
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