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Non-marine glauconitic illite in the Lower Oligocene of Aardebrug, Belgium

Published online by Cambridge University Press:  09 July 2018

D. H. Porrenga
D. H. Porrenga*
Affiliation:
Koninklijke/Shell Explortie en Produktie Laboratorium, Rijswijk, The Netherlands
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Abstract

Thin green clay layers and lenses in the lower part of the Lower Oligocene Kerkom Sand near Aardebrug, east of Louvain in Belgium, were found to consist of glauconitic illite. This mineral contains about equal amounts of iron and aluminium oxides (14%) and is therefore intermediate in chemical composition between most illites and glauconites.

Comparison with the results of five published investigations of similar green clays in France and the United States shows that the green clays, which all have an intermediate glauconite-illite composition, are formed, unlike pelletoidal glauconite, in a non-marine environment. It is assumed that they developed in a lagoonal or hypersaline-lacustrine environment, probably as a result of the alteration of detrital illite-montmorillonite clay.

Type
Research Article
Information
Clay Minerals , Volume 7 , Issue 4 , December 1968 , pp. 421 - 430
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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