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Characterization and origin of two Fe-rich bentonites from Westerwald (Germany)

Fontaine François, Christidis Georgios, Yans Johan, Hollanders Sofie, Hoffman Andreas, Fagel Nathalie

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URIhttp://purl.tuc.gr/dl/dias/0027E94C-6611-47A4-A2D4-4B281089C263-
Αναγνωριστικόhttps://doi.org/10.1016/j.clay.2020.105444-
Αναγνωριστικόhttps://www.sciencedirect.com/science/article/pii/S0169131720300090?via%3Dihub#!-
Γλώσσαen-
Μέγεθος15 pagesen
ΤίτλοςCharacterization and origin of two Fe-rich bentonites from Westerwald (Germany)en
ΔημιουργόςFontaine Françoisen
ΔημιουργόςChristidis Georgiosen
ΔημιουργόςΧρηστιδης Γεωργιοςel
ΔημιουργόςYans Johanen
ΔημιουργόςHollanders Sofieen
ΔημιουργόςHoffman Andreasen
ΔημιουργόςFagel Nathalieen
ΕκδότηςElsevieren
ΠερίληψηThe 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 Paleozoic 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.en
ΤύποςPeer-Reviewed Journal Publicationen
ΤύποςΔημοσίευση σε Περιοδικό με Κριτέςel
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2021-09-09-
Ημερομηνία Δημοσίευσης2020-
Θεματική ΚατηγορίαWesterwalden
Θεματική ΚατηγορίαBentoniteen
Θεματική ΚατηγορίαGenesisen
Θεματική ΚατηγορίαGeochemistryen
Θεματική ΚατηγορίαFe-rich smectiteen
Θεματική ΚατηγορίαAnataseen
Βιβλιογραφική ΑναφοράF. Fontaine, G. E. Christidis, J. Yans, S. Hollanders, A. Hoffman, and N. Fagel, “Characterization and origin of two Fe-rich bentonites from Westerwald (Germany),” Appl. Clay Sci., vol. 187, Mar. 2020. doi: 10.1016/j.clay.2020.105444en

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