Abstract

Abstract The nature and origin of the amorphous coatings in the albic and spodic horizons of three Spodosolic soils from the Chapleau area of northeastern Ontario, Canada were studied by optical and scanning electron microscopy, energy dispersive analysis and wavelength dispersive electron microprobe analysis. The feldspar grains in the eluviated horizons exhibited a wide variety of dissolution features. The composition of the amorphous materials within the illuviated horizons was dominated by Si, Al, and Fe. Line scans through grain coatings indicated that Fe-rich and Al-rich coatings formed zonally distinct subparallel phases. The morphology of the grain coatings varied from thick patchy coatings to imogolite-like structures, with Si:Al ratios averaging 1:3.

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