Abstract
Eight soil profiles, representing major soils of the Pampean Plain, were sampled by horizons and analyzed for various properties, including magnesium contents of calcites. Samples of four horizons were further analyzed by X-ray diffraction for additional identification of carbonates. Five samples of groundwater were also analyzed. Contents of magnesium in calcites were low (0–7.8%) in the well-drained soils (all Mollisols) and higher (mostly 15–25%) in soils with natric or salic horizons. Furthermore, the mol-% of magnesium in calcites was directly correlated with Mg/Ca ratios of saturation extracts from horizon samples. From the evidence obtained, the origin of these magnesium-bearing calcites was attributed to groundwaters affecting the soils.
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