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Nature and characteristics of 1:1 phyllosilicates from weathered granite, Central Spain

Published online by Cambridge University Press:  09 July 2018

J. Garcia-Talegon ,
E. Molina  and
M. A. Vicente
J. Garcia-Talegon
Affiliation:
Inst. Recursos Naturales y Agrobiología, CSIC, Salamanca
E. Molina
Affiliation:
Dpt. Geología Universidad de Salamanca, Spain
M. A. Vicente
Affiliation:
Inst. Recursos Naturales y Agrobiología, CSIC, Salamanca
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Abstract

The nature and characteristics of 1:1 phyllosilicates (crystallinity, order and proportion of kaolinite, disordered kaolinite and 7 Å-halloysite) in deep palaeoweathering profiles developed on granitic rocks in Central Spain have been studied. The profile displays a lower part of non-silicified saprolite and an upper part of silicified saprolite, with or without a sedimentary silicified cover. The <2 µm fraction was studied using XRD, TG-DTA and IR techniques. Towards the top of the profile there is a progressive decrease in both 1:1 phyllosilicates and kaolinite contents and an increase in opal. In the upper part (silicified saprolite) two weathering fades can be distinguished: the 'white fades', in which the crystallinity of kaolinite is greater than in the 'red facies. The kaolinite in the upper parts of the profile is probably a remnant of that existing in the non-silicified saprolite, whereas disordered kaolinite and 7Å-halloysite are, at least in part, a product of transformation and/or neoformation under more surface-like conditions.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 5 , December 1994 , pp. 727 - 734
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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