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Analyses of Palygorskites and Associated Clays from the Jbel Rhassoul (Morocco): Chemical Characteristics and Origin of Formation

Published online by Cambridge University Press:  28 February 2024

Azzedine Chahi ,
Joelle Duplay  and
Jacques Lucas
Azzedine Chahi
Affiliation:
Centre de Géochimie de la Surface, Institut de Géologie, 1 rue Blessig, 67084 Strasbourg Cedex, France
Joelle Duplay
Affiliation:
Centre de Géochimie de la Surface, Institut de Géologie, 1 rue Blessig, 67084 Strasbourg Cedex, France
Jacques Lucas
Affiliation:
Centre de Géochimie de la Surface, Institut de Géologie, 1 rue Blessig, 67084 Strasbourg Cedex, France
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Abstract

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The “Formation Rouge” from the Jbel Rhassoul in Morocco is composed of detrital sediments which have a lacustrine origin. The clays contained in the less than 2 µm fraction of the sediments are detrital phengites and illites, illite/smectites or smectites, and palygorskite. Due to the presence of well preserved long fibers, the palygorskite could not have been transported. They are authigenic and must have formed directly by precipitation from solutions rich in Mg and Al. The detrital illites are impoverished in K and tetrahedral Al. The illite/smectites or smectites, on the contrary, are K-rich but have a low tetrahedral charge. They are also richer in Mg and Fe and have a different crystal size, composition, and crystallinity from the illites. They most probably formed by crystallization, similar to the palygorskites, directly from the solution. The Al could have been provided by the detrital illite, which may have been unstable in an alkaline environment and released K and Al to the solutions.

Keywords

AEMJbel RhassoulNeoformationPalygorskite
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 4 , August 1993 , pp. 401 - 411
Copyright
Copyright © 1993, The Clay Minerals Society

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