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Influence of Geological Material in the Composition of Surface Waters of Galicia (Nw Spain). Genesis of Clay Minerals

Published online by Cambridge University Press:  09 July 2018

R. Calvo De Anta  and
F. Macias
R. Calvo De Anta
Affiliation:
Departamento de Edafologia, Universidad de Santiago de Compostela, Spain
F. Macias
Affiliation:
Departamento de Edafologia, Universidad de Santiago de Compostela, Spain
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Abstract

The composition of fluvial waters can be used to predict the processes of formation and evolution of secondary minerals in Galician soils. These processes are similar in areas with different rocks, from acid to basic, the only exception being strongly serpentinized materials. In general, the nature of the rock has less influence than the characteristics of the alteration system, which is always open, acid and freely draining. Mineral neoformation is always of the monosialitic type, having different degrees of evolution. The incipient phases tend to form gibbsite as a more stable mineral, and halloysite, allophanes and imogolite as metastable forms. With time, a crystalline kaolinite would be the only stable species. These results agree with the mineralogy and the andic or ferralic properties of the soils.

Type
Research Article
Information
Clay Minerals , Volume 28 , Issue 2 , June 1993 , pp. 285 - 296
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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