Pore-scale spectral induced polarization signatures associated with FeS biomineral transformations

Details Pore-scale spectral induced polarization signatures associated with FeS biomineral transformations Pore-scale spectral induced polarization signatures associated with FeS biomineral transformations

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3421404s&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 21, CiteID L21404

Physics

Geophysics

12

Biogeosciences: Biogeophysics, Hydrology: Hydrogeophysics, Biogeosciences: Biomineralization, Physical Properties Of Rocks: Magnetic And Electrical Properties (0925)

Scientific paper

We measured spectral induced polarization (SIP) signatures in sand columns during (1) FeS biomineralization produced by sulfate reducing bacteria (Desulfovibrio vulgaris) under anaerobic conditions, and (2) subsequent biomineral dissolution upon return to an aerobic state. The low-frequency (0.1-10 Hz peak) relaxations produced during biomineralization can be modeled with a Cole-Cole formulation, from which the evolution of the polarization magnitude and relaxation length scale can be estimated. We find that the modeled time constant is consistent with the polarizable elements being biomineral encrusted pores. Evolution of the model parameters is consistent with FeS surface area increases and pore-size reduction during biomineral growth, and subsequent biomineral dissolution (FeS surface area decreases and pore expansion) upon return to the aerobic state. We conclude that SIP signatures are diagnostic of pore-scale geometrical changes associated with FeS biomineralization by sulfate reducing bacteria.

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