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Palygorskite genesis through silicate transformation in Tunisian continental Eocene deposits

Published online by Cambridge University Press:  09 July 2018

F. Jamoussi ,
A. Ben Aboud  and
A. López-Galindo
F. Jamoussi
Affiliation:
Laboratoire ‘ Géoressources’, INRST BP 95, 2050 Hamam-Lif, Tunisia
A. Ben Aboud
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, Fuentenueva s/n, 18002, GranadaSpain
A. López-Galindo*
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, Fuentenueva s/n, 18002, GranadaSpain
*
*E-mail: alberto@ugr.es
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Abstract

The mineralogical and geochemical characteristics of Eocene continental sediments in south central Tunisia (Chebket Bouloufa and Jebel Hamri) and in north central Tunisia (Jebel Lessouda and Jebel Rhéouis), which contain considerable amounts of palygorskite, were studied. The clay fraction of the sediments also comprises illite, kaolinite, Mg smectite and Al smectite, together with carbonates (calcite and/or dolomite), quartz, gypsum and feldspars, all of which are present in extremely variable proportions.

The textural characteristics of the samples containing most palygorskite, as well as the chemical composition of the fibres and the contents of certain trace and rare earth elements suggest that the genesis of this fibrous clay is intimately linked to the diagenetic transformation of illite, mixedlayered minerals and/or Al smectite, as has also been observed in contemporaneous deposits in Morocco.

Keywords

palygorskiteilliteTunisiaEocene.
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 2 , June 2003 , pp. 187 - 199
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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