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• W2011279892 abstract "The origin of carbonate accumulations in termite mounds is a controversial issue. This study is an attempt to elucidate the processes of carbonate precipitation in Macrotermes mounds built on Ferralsols in Upper Katanga, D.R. Congo, whereby a differentiation between pedogenic and inherited carbonates is considered. Carbonate features were investigated for a 9 m deep termite-mound profile, and for an 18 m wide cross-section through a termite mound and the adjacent soil, using field and laboratory techniques. Field evidence for a pedogenic origin includes morphological type (soft powdery materials, nodules, and coatings on ped surfaces) and distribution patterns of the carbonates. Thin-section studies reveal that the carbonates occur predominantly as impregnative orthic nodules and less commonly as coatings, both clearly pedogenic; calcareous pellets are interpreted as locally reworked pedogenic carbonates. X-ray diffraction (XRD), scanning electron microscopy/energy dispersive X-ray spectrometry (SEM–EDS) and stable isotope (δ13C) analyses show that all isolated carbonate features consist of high-Mg calcite (4.9–12.3 mol% MgCO3) with δ13C signatures ranging from − 13.2‰ to − 11.5‰. Weddellite (CaC2O4. 2H2O) is identified in a thin-section and by XRD analysis, and appears to be locally transformed into calcite. The stable isotope composition of carbon suggests that calcite precipitated in equilibrium with soil CO2 generated during decomposition of soil organic matter, and locally most likely during oxidation of oxalate. This study proves that carbonates which accumulated in Macrotermes mounds are pedogenic precipitates, whose deposition is partly related to microbial decay of organic matter, subsequently redistributed to some extent by abiotic dissolution–reprecipitation and termite activity." @default.
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• W2011279892 date "2011-10-01" @default.
• W2011279892 modified "2023-10-01" @default.
• W2011279892 title "The origin of carbonates in termite mounds of the Lubumbashi area, D.R. Congo" @default.
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• W2011279892 doi "https://doi.org/10.1016/j.geoderma.2011.07.009" @default.
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