Abstract
Transformation of clay minerals (smectite-zeolite, illite, kaolinite, and bentonite) and admixtures of iron oxides (hydroxides) under the action of an alkaline cyanobacterial community was studied. The results demonstrate that the processes of transformation of clay minerals such as intensification of removal of exchange bases and dissolution of silicates and iron oxides occurred in the presence of the alkaliphilic cyanobacterial community. The main factor that determines resistance of a mineral to biochemical weathering is its composition. Transformations of clay minerals in the course of active cyanobacterial photosynthesis (up to 14 days) and at decomposition of organic matter (OM) (28–60 days) are different. For smectite-zeolite and illite, these processes are dissolution of silicates and oxides (removal of Si and Fe) and removal of exchange bases (K), which were observed at both the of biomass production and OM destruction stages. For two other clays, the processes of neosynthesis are more typical: formation of carbonates (most probably siderite for bentonite clay and Mg-calcite for kaolin clay) and transformation of ferrihydrite into the more thermodynamically stable goethite.
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Original Russian Text © T.V. Alekseeva, E.V. Sapova, L.M. Gerasimenko, A.O. Alekseev, 2009, published in Mikrobiologiya, 2009, Vol. 78, No. 6, pp. 816–825.
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Alekseeva, T.V., Sapova, E.V., Gerasimenko, L.M. et al. Transformation of clay minerals caused by an alkaliphilic cyanobacterial community. Microbiology 78, 776–784 (2009). https://doi.org/10.1134/S0026261709060150
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DOI: https://doi.org/10.1134/S0026261709060150