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Relationships between composition and structure in Fe-rich smectites

Published online by Cambridge University Press:  09 July 2018

Maria Franca Brigatti
Maria Franca Brigatti*
Affiliation:
Istituto di Mineralogica e Petrologia dell'Università, Piazza S. Eufemia 19, 41.100—Modena, Italy
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Abstract

Chemical and crystallochemical properties of natural dioctahedral Fe-rich smectites formed by weathering of basaltic rocks in the Berici-Euganei Area, northern Italy, were investigated. It was found that: (i) the b-dimension could be correlated both to Fe3+/Σ ratio (Σ = octahedral occupancy) and to dehydroxylation peak temperature in the range 400–600°C; (ii) it is not correct to impose a total octahedral occupancy strictly equal to 2 for dioctahedral smectites; (iii) in the smectite group there is not a continuous isomorphous series as would appear on the basis of chemical features only.

Resume

Resume

Des propriétés chimiques et cristallochimiques de smectites dioctaédriques naturelles, riches en fer, formées par l'érosion de roches basaltiques dans la région de Berici-Euganei (Italie du Nord), ont été examinées. L'étude a conduit aux conclusions suivantes: (i) le paramètre b peut être relié au rapport Fe3+/Σ (Σ: occupation des sites octaédriques) et à la température du pic de déshydroxylation dans le domaine de températures 400–600°C; (ii) dans le cas des smectites dioctaédriques, il n'est pas judicieux d'imposer une occupation des sites octaédriques égale à 2; (iii) dans le groupe des smectites, il n'existe pas de série isomorphe continue, telle que les seules propriétés chimiques le laisseraient prévoir.

Kurzreferat

Kurzreferat

Die chemischen und kristallchemischen Eigenschaften natürlicher dioktaedrischer eisenreicher Smektite, die durch Verwitterung basaltischer Gesteine in Berici-Euganei-Bereich (Nord-Italien) entstanden waren, wurden untersucht. Es wurde gefunden, daß die Größe der b-Achse sowohl mit den Fe3+/Σ-Verhältnis (Σ = oktaedrische Besetzungsdichte) als auch zur Temperatur des Dehydroxylierungspeaks im Bereich von 400 bis 600°C korreliert ist, (ii) daß für die gesamte oktaedrische Besetzungsdichte nicht ein Wert von exakt 2 für die oktaedrische Smektite vorausgesetzt werden darf, (iii) daß es in der Smektitgruppe keine kontinuierliche isomorphe Serie gibt, wie es auf der Basis chemischen Eigenschaften angenommen werden könnte.

Resumen

Resumen

Se han estudiado las propiedades quimicas y cristaloquimicas de unas esmectitas dioctaédricas naturales ricas en hierro, formadas por alteración de rocas basálicas en el área de Berici-Euganei, al norte de Italia. Los resultados indican que: (i) el valor del parámetro b podría estar correlacionado con la relación Fe+3/Σ (Σ = nivel de ocupación octaédrica) y con la temperatura de deshidroxilación en el rango de 400–600°C (ii) no es correcto imponer una ocupación octaédrica exactamente igual a 2 para las esmectitas dioctaédricas; (iii) en el grupo de las esmectitas no hay una serie isomórfica continua como podría deducirse teniendo en cuenta sólo sus propiedades químicas.

Type
Research Article
Information
Clay Minerals , Volume 18 , Issue 2 , June 1983 , pp. 177 - 186
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1983

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