Does anyone knows any article about the influence o calcium carbonate on soil color, especificaly in hematite formation?
OK, there appears to be two questions here:
1) what is the effect of the presence/addition of CaCO3 on soil colour (presumably upon Fe-rich soils)?
2) Does the presence/addition of CaCO3 affect the development of Fe oxy-hydroxides in soils?
The first should be easy to quantify (if appropriate literature cannot be found) by taking example material, milling it, then adding known volumes (e., 5, 10, 20% etc.) by volume of pure CaCO3 powder and then comparing the resultant powder mixes to a Munsell colour diagram. This would be a simple, neat experiment with quantifiable results.
The second question is complex since it requires a priori knowledge of the catalysing or inhibiting properties of CaCO3 upon hematite formation. I know of experiments investigating the influence of Si upon Fe oxy-hydroxide development, but not directly of CaCO3. Does anyone else?
Another way forward might be to determine the likely alkalinity of groundwater derived from interacting with a CaCO3 - rich substrate, and then asses the stabilities of Fe oxyhydroxides within the estimated pH range exhibited by these modelled groundwaters.
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