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Título

High-Charge Smectite in Spanish "Raña" Soils

AutorAragoneses, F. J.; García-González, M.T.
Palabras claveHihg-Charge Smectite
Hydroxy-interlayer clays
Layer charge
Raña- soils
Soil clay
Fecha de publicación1991
EditorClay Minerals Society
CitaciónClays and Clay Minerals 39 (2):211-218 (1991)
ResumenIn a study of "raña" soils of central Spain, hydroxy-interlayered 2:1 clay minerals were identified in the upper horizons and high-charge smectite in the lower horizons, with kaolinite the most abundant phylosilicate. The high-charge smectite showed a basal spacing of 18 Á on Mg-satnration and glycerol solvation and 10 Á on K-saturation and air-drying. It is concentrated in the coarse fractions and appears to be basically a berdellite in the fine-silt fractions and a montmonllonite in the clay fractions. Pre-existing illite was probably transformed into hydroxy-interlayered 2:1 clays in the surface honzons, whercas high-charge smectite formed in the deper horizons. These minerals, which were apparently not stable in the existing soil conditions, were the first stage in the degradation process of illite. The stable mineral in these soil profiles was kaolinite.
Descripción7 pages, figures, and tables statistics.
URIhttp://hdl.handle.net/10261/24698
ISSN009-8604
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