| Autor: |
David W. Blowes, Richard T. Amos, Sean A. Sinclair, Jeff B. Langman, Hoang N. Pham, David C. Sego, Andrew Krentz, Leslie Smith, Lianna J.D. Smith |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Journal of Geochemical Exploration. 156:61-71 |
| ISSN: |
0375-6742 |
| DOI: |
10.1016/j.gexplo.2015.05.004 |
| Popis: |
Leachate from a humidity cell experiment provided a geochemical framework to evaluate the early evolution of weathering of the same waste rock in an Arctic environment. Comparison of laboratory and field results indicates the hydrogeochemical system within the higher sulfide (0.01–0.27 wt.% S) waste rock pile has attained a peak weathering state, indicated by a shift to acid neutralization by weathering products of Al-bearing minerals, stabilization of the pH near 4.5, mobility of metals from sulfide and Al-bearing minerals, and a highly correlated relation between SO 4 release and outflow from the waste rock pile. Further weathering of the waste rock should be driven by external environmental factors of temperature and precipitation/infiltration instead of internal factors of wetting and transient acid-neutralization processes. An evaluation of sulfide depletion indicates that 4% of the sulfide in the 4 . Weathering is strongly seasonal because of the Arctic climate, which produced a daily sulfide-depletion rate corresponding 0–0.02% and a peak annual depletion of 100 kg or 1.5% of the remaining sulfide content in the |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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