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Clays and Clay Minerals; February 2007; v. 55; no. 1; p. 36-44; DOI: 10.1346/CCMN.2007.0550103
© 2007 Clay Minerals Society
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PARTICLE PROPERTIES OF HYDROTHERMAL AMMONIUM-BEARING ILLITE-SMECTITE

Vladimír Sucha1, Peter Uhlík1, Jana Madejová2, Sabine Petit3, Ivan Kraus1 and L’ubica Puskelová4

1 Faculty of Natural Sciences, Comenius University, Mlynská dolina G, 842 15 Bratislava, Slovak Republic
2 Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská 9, Bratislava, Slovak Republic
3 Université de Poitiers, CNRS UMR 6532, 40, av. du recteur Pineau, 86022 Poitiers, France
4 Geological Institute, Slovak Academy of Sciences, Dúbravská 9, Bratislava, Slovak Republic

* E-mail address of corresponding author: sucha{at}fns.uniba.sk

Mixed-layer illite-smectite with high degree of ordering (rectorite-like clay) and with three types of interlayer cations – K+, Na+ and NH+4, was determined in the high-sulfide epithermal mineralization of the Western Carpathian Mountains. The tobelitic portion of the clay comprises 5–10%. Ammonium was detected both by chemical analysis and by Fourier transform infrared analysis. Some of the ammonium can be assigned to a poorly bound form, not fully fixed in the illitic interlayer. The finest size fraction separated from the samples behaves differently from the rest of the sample. It contains two layers of water molecules in the expandable interlayers as determined by X-ray diffraction, whereas coarser fractions have only one water layer in the interlayers.

Key Words: Ammonium Illite-smectite • Carpathian Mountains • Hydrothermal Activity • Particle Properties • Rectorite-like Mineral






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