Ferruginous Concretions in a Poorly Drained Soil of Alberta1
- S. Pawluk and
- J. Dumanski2
Investigations into the nature of a poorly-drained soil pedon developed from acid shales in the Peace River region of Alberta, Canada, revealed the presence of ferruginous concretions in the A and B horizons. Concretions from both horizons were separated into two groups, magnetic and nonmagnetic. Magnetic properties were attributed to the preesnce of maghemite. This mineral was associated with iron oxides amorphous to X-rays in the A horizon and with hematite in the B horizon. Iron oxide in nonmagnetic concretions from the A horizon was X-ray amorphous while that in the B was crystallized as both goethite and hematite.
Magnetic concretions from the A horizon showed dense areas when viewed in thin-sections and contained less organic matter and oxalate extractable iron than the associated nonmagnetic concretions.
An authigenic origin is suggested for the concretions.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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