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    Changes in mineral reactivity driven by pore fluid mobility in partially wetted porous media

    Access Status
    Fulltext not available
    Authors
    Harrison, A.
    Dipple, G.
    Song, W.
    Power, I.
    Mayer, K.
    Beinlich, Andreas
    Sinton, D.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Harrison, A. and Dipple, G. and Song, W. and Power, I. and Mayer, K. and Beinlich, A. and Sinton, D. 2017. Changes in mineral reactivity driven by pore fluid mobility in partially wetted porous media. Chemical Geology. 463: pp. 1-11.
    Source Title
    Chemical Geology
    DOI
    10.1016/j.chemgeo.2017.05.003
    ISSN
    0009-2541
    School
    The Institute for Geoscience Research (TIGeR)
    URI
    http://hdl.handle.net/20.500.11937/53203
    Collection
    • Curtin Research Publications
    Abstract

    Microfluidics experiments were used to examine mineral dissolution-precipitation reactions under evaporative conditions and identify pore-scale processes that control reaction rate. The entrainment of reacting mineral particles by a mobile water-gas interface driven by evaporation dramatically altered the relative abundance of reactive mineral surface area to fluid reservoir volume. This ratio, which directly influences reaction rate and reaction progress, was observed to vary by nearly two orders of magnitude as evaporation progressed in the experiments. Its dynamic evolution may have a correspondingly large impact on mineral-fluid reaction in Earth's shallow subsurface. We predict that the spatial and temporal variability of pore-scale reaction rates will be significant during evaporation, imbibition, or drainage in the vadose zone, with implications for chemical weathering, soil quality, and carbon cycling. Variable reaction rates during particle mobility are likely to be of increased significance as global rainfall patterns and soil moisture contents evolve in response to climate change.

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