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Chemistry of Mg Smectites in Lacustrine Sediments from the Vicalvaro Sepiolite Deposit, Madrid Neogene Basin (Spain)

Published online by Cambridge University Press:  01 January 2024

Jaime Cuevas ,
Raquel Vigil de la Villa ,
Susana Ramirez ,
Sabine Petit ,
Alain Meunier  and
Santiago Leguey
Jaime Cuevas*
Affiliation:
Departamento de Química Agrícola, Geología y Geoquímica, Facultad de Ciencias, Universidad Autónona de Madrid., Cantoblanco s/n, 28049 Madrid, Spain
Raquel Vigil de la Villa
Affiliation:
Departamento de Química Agrícola, Geología y Geoquímica, Facultad de Ciencias, Universidad Autónona de Madrid., Cantoblanco s/n, 28049 Madrid, Spain
Susana Ramirez
Affiliation:
Departamento de Química Agrícola, Geología y Geoquímica, Facultad de Ciencias, Universidad Autónona de Madrid., Cantoblanco s/n, 28049 Madrid, Spain UMR 6532 CNRS, Universite de Poitiers, 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
Sabine Petit
Affiliation:
UMR 6532 CNRS, Universite de Poitiers, 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
Alain Meunier
Affiliation:
UMR 6532 CNRS, Universite de Poitiers, 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France
Santiago Leguey
Affiliation:
Departamento de Química Agrícola, Geología y Geoquímica, Facultad de Ciencias, Universidad Autónona de Madrid., Cantoblanco s/n, 28049 Madrid, Spain
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The chemical and structural properties of Mg smectites in the Vicálvaro sepiolite deposit have been studied in detail. The characterization was performed on different size-fractions of selected smectitic samples (5−2 µm; 2−1 µm; 1−0.5 µm; <0.5 µm and <0.1 µm). The chemical compositions of individual particles (5−1 µm) and of bulk undifferentiated fine fractions (1−<0.1 µm) were determined by energy dispersive spectroscopy-scanning electron microscopy and interpreted with the aid of X-ray diffraction (XRD) and infrared spectroscopy (IR) methods. The XRD and IR data demonstrate that all of the Mg smectite materials studied are mainly composed of a complex mixture of stevensite, saponite and mica-type minerals. Although the presence or absence of saponite cannot be confirmed absolutely, stevensite is a significant component of these Mg smectites. This is proven by the calculated layer charge reduction after the Hofmann-Klemen effect. The results are in close agreement with the suggested mechanism of topotactic overgrowth of stevensite on pre-existing phyllosilicate templates. This characterizes clay diagenesis in saline-lake systems.

Keywords

Fe-rich Dioctahedral MicasLacustrine Mg ClaysSaponiteStevensiteTrioctahedral SmectitesVicálvaro Sepiolite DepositSpain
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 4 , August 2003 , pp. 457 - 472
Copyright
Copyright © 2003, The Clay Minerals Society

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