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    Surficial weathering of iron sulfide mine tailings under semi-arid climate

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    Author
    Hayes, Sarah M
    Root, Robert A
    Perdrial, Nicolas
    Maier, Raina
    Chorover, Jon
    Affiliation
    Univ Arizona, Dept Soil Water & Environm Sci
    Issue Date
    2014-09-15
    Keywords
    QXRD
    XAS
    iron XANES
    semi-arid mine tailings
    sulfur XANES
    
    Metadata
    Show full item record
    Publisher
    PERGAMON-ELSEVIER SCIENCE LTD
    Citation
    Hayes, S. M., Root, R. A., Perdrial, N., Maier, R. M., & Chorover, J. (2014). Surficial weathering of iron sulfide mine tailings under semi-arid climate. Geochimica et cosmochimica acta, 141, 240-257.
    Journal
    GEOCHIMICA ET COSMOCHIMICA ACTA
    Rights
    Copyright © 2014 Elsevier Ltd. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Mine wastes introduce anthropogenic weathering profiles to the critical zone that often remain unvegetated for decades after mining cessation. As such, they are vulnerable to wind and water dispersion of particulate matter to adjacent ecosystems and residential communities. In sulfide-rich ore tailings, propagation to depth of the oxidative weathering front controls the depth-variation in speciation of major and trace elements. Despite the prevalence of surficial mine waste deposits in arid regions of the globe, few prior studies have been conducted to resolve the near-surface profile of sulfide ore tailings weathered under semi-arid climate. We investigated relations between gossan oxidative reaction-front propagation and the molecular speciation of iron and sulfur in tailings subjected to weathering under semi-arid climate at an EPA Superfund Site in semi-arid central Arizona (USA). Here we report a multi-method data set combining wet chemical and synchrotron-based X-ray diffraction (XRD) and X-ray absorption near-edge spectroscopy (XANES) methods to resolve the tight coupling of iron (Fe) and sulfur (S) geochemical changes in the top 2 m of tailings. Despite nearly invariant Fe and S concentration with depth (130-140 and 100-120 g kg-1, respectively), a sharp redox gradient and distinct morphological change was observed within the top 0.5 m, associated with a progressive oxidative alteration of ferrous sulfides to (oxyhydr)oxides and (hydroxy)sulfates. Transformation is nearly complete in surficial samples. Trends in molecular-scale alteration were co-located with a decrease in pH from 7.3 to 2.3, and shifts in Fe and S lability as measured via chemical extraction. Initial weathering products, ferrihydrite and gypsum, transform to schwertmannite, then jarosite-group minerals with an accompanying decrease in pH. Interestingly, thermodynamically stable phases such as goethite and hematite were not detected in any samples, but ferrihydrite was observed even in the lowest pH samples, indicating its metastable persistence in these semiarid tailings. The resulting sharp geochemical speciation gradients in close proximity to the tailings surface have important implications for plant colonization, as well as mobility and bioavailability of co-associated toxic metal(loid)s.
    Note
    24 month embargo; published online: 5 June 2014
    ISSN
    0016-7037
    PubMed ID
    25197102
    DOI
    10.1016/j.gca.2014.05.030
    Version
    Final accepted manuscript
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0016703714003597
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.gca.2014.05.030
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