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Ferruginous Concretions in a Poorly Drained Soil of Alberta
Author(s) -
Pawluk S.,
Dumanski J.
Publication year - 1973
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1973.03615995003700010036x
Subject(s) - authigenic , goethite , horizon , hematite , maghemite , geology , iron oxide , concretion , soil horizon , mineralogy , organic matter , geochemistry , mineral , soil water , soil science , chemistry , diagenesis , physics , organic chemistry , adsorption , astronomy
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.