Structural Transformations of Interstratified Illite-Smectites from Dolná Ves Hydrothermal Deposits: Dynamics and Mechanisms

V. A. Drits, A. L. Salyn and V. Šucha
Geological Institute, Academy of Sciences, Moscow, Russia
1 Comenius University, Bratislava, Slovakia

Abstract: Structural transformations of illite-smectite samples of hydrothermal genesis with increasing contents of illite layers were studied by X-ray powder diffraction. The samples were K-saturated and subjected to wetting and drying cycles to increase three-dimensional structural ordering. Diffraction profiles were analyzed with the help of a specially devised computer program based on the approximation of individual diffraction reflections by “bell-shaped” functions, with minimization of the differences between experimental and simulated profiles. The data indicate that the transformations of these illite-smectite samples were accompanied not only by variations in the proportion of illite and smectite layers and in the pattern of their alternation, but also by a change in structure within 2:1 layers.

Key Words: Cis-octahedron • Illite-smectite • Illitization • Phase Transformations • Trans-octahedron

Clays and Clay Minerals; April 1996 v. 44; no. 2; p. 181-190; DOI: 10.1346/CCMN.1996.0440203
© 1996, The Clay Minerals Society
Clay Minerals Society (www.clays.org)