A contribution to the study of the stability of clay minerals from the soil solution composition at different pF values

(EN)The composition of the soil solution of various horizons of Galician soils was studied to gain insight into the direction of the processes of weathering and neoformation by means of stability diagrams of the clay minerals. The soil solution was extracted by compression at various pF values. The...

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Detalles Bibliográficos
Autores: Fernández Marcos, María Luisa, Macías Vázquez, Felipe, Guitián Ojea, Francisco
Tipo de recurso: artículo
Fecha de publicación:1979
País:España
Institución:Universidad de Santiago de Compostela (USC)
Repositorio:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
Idioma:inglés
OAI Identifier:oai:minerva.usc.gal:10347/11812
Acceso en línea:http://hdl.handle.net/10347/11812
Access Level:acceso abierto
Palabra clave:Materias::Investigación::25 Ciencias de la tierra y del espacio::2511 Ciencias del suelo (Edafología)::251110 Mineralogía de suelos
Descripción
Sumario:(EN)The composition of the soil solution of various horizons of Galician soils was studied to gain insight into the direction of the processes of weathering and neoformation by means of stability diagrams of the clay minerals. The soil solution was extracted by compression at various pF values. The most significant results are as follows: In all the cases studied the mineral in equilibrium with the soil solution is a 1:1 phyllosilicate. As the pF at which the soil solution is extracted increases, corresponding to smaller pore size, pH increases and silica concentration falls. The stable mineral does not vary significantly between different horizons of the same profile. Each parent material gives rise to a different zonation in the stability diagrams. The predictions of the stability diagrams are in general agreement with the mineralogical data of the clays of the horizons in question. Finally, weathering processes in Galicia are briefly commented on.

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