Abstract
Long-term experimental (bio)weathering revealed that Fe-rich sandstone was more susceptible to biodeterioration as compared to Fe-depleted sandstone. Leaching data combined with surface observations indicated higher susceptibility of goethite (FeOOH) than hematite (Fe2O3) to dissolution. Organic-rich weathering conditions were found to have a larger impact on sandstones as compared to inorganic weathering. Element release from the mineral lattice can be largely enhanced by organic conditions affecting dissolution of hematite cement and changing stoichiometric proportions of elements initially bound in matrix and cement minerals. This study highlights that long-term episodes of biotic and abiotic weathering constitute key factors affecting susceptibility of sandstones to degradation processes.
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