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Clays and Clay Minerals; August 2003; v. 51; no. 4; p. 457-472; DOI: 10.1346/CCMN.2003.0510413
© 2003 Clay Minerals Society
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CHEMISTRY OF Mg SMECTITES IN LACUSTRINE SEDIMENTS FROM THE VICALVARO SEPIOLITE DEPOSIT, MADRID NEOGENE BASIN (SPAIN)

Jaime Cuevas1,*, Raquel Vigil de la Villa1, Susana Ramirez1,2, Sabine Petit2, Alain Meunier2 and Santiago Leguey1

1 Departamento de Química Agrícola, Geología y Geoquímica, Facultad de Ciencias, Universidad Autónona de Madrid. Cantoblanco s/n 28049 Madrid, Spain
2 UMR 6532 CNRS, Universite de Poitiers, 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France

* E-mail address of corresponding author: Jaime.Cuevas{at}uam.es

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.

Key Words: Fe-rich Dioctahedral Micas • Lacustrine Mg Clays • Saponite • Stevensite • Trioctahedral Smectites • Vicálvaro Sepiolite Deposit • Spain




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M. YENIYOL
Characterization of a Mg-rich and low-charge saponite from the Neogene lacustrine basin of Eskisehir, Turkey
Clay Minerals, December 1, 2007; 42(4): 541 - 548.
[Abstract] [Full Text] [PDF]


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