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Abstract
Mineralogical and micromorphological examination of Solodized Solonetz pedons show the presence of both crystalline and non-crystalline authigenic minerals in the Ae horizons and the solodized zones of the columnar Bnt horizons. A zeolite mineral with the characteristics of clinoptilolite was detected in the coarse clay (1.0–2.0 μm) separates and was the mineral species dominant in the < 2.35 specific gravity separates of the fine (2.0–5.0 μm) and medium (5.0–20.0 μm) silt fractions. Measurement of pH (1.0 M NaF) of whole soil samples from the solodized zone of these pedons indicated the presence of high levels of active aluminum. Treatment with acid ammonium oxalate and hot 0.5 M KOH indicated that the poorly crystalline material was composed predominantly of silicon, aluminum and iron. Differential FT-IR analyses of these clay fractions before and after the chemical extractions indicated that components of this phase have characteristics reported for both opaline silica and allophane. Key words: Authigenic, clinoptilolite, solodization, allophane, smectite, opaline silica
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