Randomly Interstratified Kaolinite-Smectite from Galicia (NW Spain): A New Procedure for Determination

Giuseppe Corti1, Maria Jose Fernández Sanjurjo2 and Fiorenzo Cesare Ugolini1
1 Dipartimento di Scienza del Suolo e Nutrizione della Pianta, Piazzale delle Cascine 28, 50144 Firenze, Italy
2 Departamento de Edafología y Química Agrícola, Facultad de Biología, 15706 Santiago de Compostela, Spain

Abstract: A new protocol was developed to examine an assemblage of kaolinite-smectite in a buried horizon of a paleosol developed on gabbro parent material. The new extraction procedure appears suitable for removing kaolinite and for ascertaining the nature of the smectite interstratified with kaolinite. Smectite was identified by X-ray diffraction (XRD) and infrared (IR) patterns, cation exchange capacity (CEC) and chemical analyses.

The results obtained provide for increased understanding of the process of transformation of smectite into kaolinite.

Key Words: Acid Soil • Gabbro • Interstratified Kaolinite-Smectite • Paleohorizons

Clays and Clay Minerals; December 1998 v. 46; no. 6; p. 705-711; DOI: 10.1346/CCMN.1998.0460611
© 1998, The Clay Minerals Society
Clay Minerals Society (www.clays.org)