Article (Scientific journals)
Characterization and origin of two Fe-rich bentonites from Westerwald (Germany)
Fontaine, François; Christidis, George; Yans, Johan et al.
2020In Applied Clay Science, 187
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Keywords :
Bentonite; Fe-rich smectite; Beidellite
Abstract :
[en] The Westerwald region is one of the major ceramic clay mining areas of Germany. The mined clays were deposited on the weathered Rhenish massif during Eocene and Oligocene and were protected from erosion by a large alkaline basalt cover. Two Fe-rich bentonite layers exposed in quarries of the Eastern part of the Westerwald were investigated with X-ray diffraction, thermogravimetric analysis, infrared spectroscopy, optical microscopy, scanning electron microscopy, chemical analyses and cation exchange capacity (CEC). In both bentonite layers, the main mineral is a high-charge Fe-rich beidellite containing exchangeable Ca and Mg. Even if they both derive from mafic volcanic rocks, the difference in accessory minerals and trace element content leads to the conclusion that they have a different precursor. The lower bentonite layer also contains talc, saponite, halloysite, goethite and anatase. It is part of the Palaeozoic bedrock and results from the weathering of a Lower Carboniferous metabasalt. The upper bentonite layer has Upper Oligocene age and has been derived from the alteration of tuffite with a composition ranging from alkali basalt to trachyte. This bentonite is linked to the first eruptions of the intraplate Cenozoic volcanic activity of the Westerwald.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Fontaine, François ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Christidis, George
Yans, Johan
Hollanders, Sofie
Hoffman, Andreas
Fagel, Nathalie  ;  Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Language :
English
Title :
Characterization and origin of two Fe-rich bentonites from Westerwald (Germany)
Alternative titles :
[fr] Caractérisation et origine de deux bentonites riches en fer du Westerwald (Allemagne)
Publication date :
2020
Journal title :
Applied Clay Science
ISSN :
0169-1317
eISSN :
1872-9053
Publisher :
Elsevier, Netherlands
Volume :
187
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 March 2020

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