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Rare-earth elements as tracers of the genetic relationship between smectite and palygorskite in marine phosphorites

Published online by Cambridge University Press:  09 July 2018

A. Chahi ,
N. Clauer ,
T. Toulkeridis  and
M. Bouabdelli
A. Chahi
Affiliation:
Centre de Géochimie de la Surface (CNRS-ULP), 1 rue Blessig, 67084 Strasbourg, France Faculté des Sciences de Semlalia, Boulevard du Prince Moulay Abdallah, Marrakech, Morocco
N. Clauer*
Affiliation:
Centre de Géochimie de la Surface (CNRS-ULP), 1 rue Blessig, 67084 Strasbourg, France
T. Toulkeridis
Affiliation:
Centre de Géochimie de la Surface (CNRS-ULP), 1 rue Blessig, 67084 Strasbourg, France Institut für Geowissenschaften, Johannes Gutenberg Universität, Saarstrasse, 55099 Mainz, Germany
M. Bouabdelli
Affiliation:
Faculté des Sciences de Semlalia, Boulevard du Prince Moulay Abdallah, Marrakech, Morocco
*
1Corresponding author
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Abstract

Detrital smectite in a sandy claystone and a phosphorite, and authigenic palygorskite in a dolomitic marl and a porcellanite from Cretaceous-Tertiary phosphorite deposits of the Ganntour Basin (Morocco) were purified using cation exchange resin, leached with dilute acid, and analysed for the contents and distribution patterns of their REE before and after acid treatment. The normalized patterns confirm a detrital origin for the smectite in the sandy claystone, whereas the origin of the smectite from the phosphorite is obscured by the addition of REE from the phosphogenic environment. The normalized REE patterns of the palygorskite suggest formation in non-oxidizing restricted environments. The Al2O3/ΣREE ratio of the two clay types suggests formation of diagenetic palygorskite (and mixed-layer illite-smectite) from Al-bearing detrital smectite by a dissolution-crystallization process.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 3 , September 1999 , pp. 419 - 427
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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