EDAFOLOGÍA

Publicada por la Sociedad Española de la Ciencia del Suelo

 

Volumen 8. Abril 2001. pág 61-73.

 

 

Suelos policíclicos en el macizo gabroico de Monte Castelo (Galicia, España): estudio de su evolución edáfica

 

M.J. Fernández Sanjurjo, G. Corti(1), F.C. Ugolini(1)

 

Dpto. Edafoloxía e Química Agrícola. Facultade de Bioloxía. Universidade de Santiago de Compostela, 15706, Santiago de C. (España)

(1) Dpto. di Scienza del Suolo e Nutrizione della Pianta. UniversitÓ di Firenze. Piazzale delle Cascine, 28, 50144 Firenze (Italia)

 

Abstract. The soils of Galicia, NW Spain, developed on a gabbro parent material, often include one or more buried profiles. In the buried soil the interstratified kaolinite-smectite abounds, gibbsite is present in traces and the Fe oxyhydroxydes are mostly represented by goethite. In the modern soil the interstratified mineral is absent, gibbsite abounds and the Fe oxyhydroxydes are constituted by maghemite. Chemical results confirm that the modern solum has originated under conditions that strongly contrast with those that favoured the formation of the buried one. We inferred that the interstratified kaolinite-smectite is a fossil mineral that could help in reconstructing the pedogenetic history of these soils.

Keywords: kaolinite-smectite interstratified, leaching, weathering, buried soil, pedogenetic processes

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