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This article in SSSAJ

  1. Vol. 37 No. 1, p. 124-127
    Received: May 15, 1972
    Accepted: Sept 29, 1972

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Ferruginous Concretions in a Poorly Drained Soil of Alberta1

  1. S. Pawluk and
  2. 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.

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