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Variations in the chemistry of smectites from the Calatayud Basin (NE Spain)

Published online by Cambridge University Press:  09 July 2018

M. J. Mayayo ,
B. Bauluz  and
J. M. Gonzalez Lopez
M. J. Mayayo
Affiliation:
Departamento de Ciencias de la Tierra, Area de Cristalografía y Mineralogía, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
B. Bauluz
Affiliation:
Departamento de Ciencias de la Tierra, Area de Cristalografía y Mineralogía, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
J. M. Gonzalez Lopez
Affiliation:
Departamento de Ciencias de la Tierra, Area de Cristalografía y Mineralogía, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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Abstract

Smectites of sedimentary series from a playa lake system from Calatayud Basin have been studied by XRD and TEM chemical microanalyses. Clay particle microanalyses show complete continuity between dioctahedral aluminous and trioctahedral magnesian smectites. Aluminous smectites have been classified as montmorillonites and ferribeidellites, both with compositional variability. They represent detrital phases resulting from weathering in the source area. Compositionally-intermediate smectites (beidellite-saponite and montmorillonite-stevensite) seem to correspond to weighted mean compositions of di- and trioctahedral phases stacked together in the same particle. They represent intermediate transitional stages from detrital to authigenic smectites in more distal basin facies. Trioctahedral smectites, although called saponites and stevensites, are actually random mixed-layer kerolite-Mg-smectite with a high percentage of expandable layers. They represent authigenic clays formed from solutions with high pH and Mg content as a result of evaporative concentration. The variability in composition of smectites, both within the same sample and amongst different samples, is a possible consequence of the heterogeneity in the local chemical environment, and so, equilibrium may be only reached locally in a large variety of microsystems.

Keywords

smectiteCalatayud BasinSpainchemistry
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 2 , April 2000 , pp. 365 - 374
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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