2024-03-29T15:47:19Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/246982021-05-24T12:21:05Zcom_10261_129com_10261_6col_10261_382
High-Charge Smectite in Spanish "Raña" Soils
Aragoneses, F. J.
García-González, M. T.
Hihg-Charge Smectite
Hydroxy-interlayer clays
Layer charge
Raña- soils
Soil clay
7 pages, figures, and tables statistics.
In 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.
2010-05-26T07:55:06Z
2010-05-26T07:55:06Z
1991
artículo
Clays and Clay Minerals 39 (2):211-218 (1991)
009-8604
http://hdl.handle.net/10261/24698
eng
openAccess
Clay Minerals Society