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X-Ray Identification of One-Layer Illite Varieties: Application to the Study of Illites Around Uranium Deposits of Canada

Published online by Cambridge University Press:  28 February 2024

V. A. Drits ,
F. Weber ,
A. L. Salyn  and
S. I. Tsipursky
V. A. Drits
Affiliation:
Geological Institute of the Russian Academy of Sciences, 7 Pyzhevsky per., 109017, Moscow, Russia
F. Weber
Affiliation:
Centre de Geochimie de la Surface, 1 rue Blessing, 67084, Strasbourg, France
A. L. Salyn
Affiliation:
Geological Institute of the Russian Academy of Sciences, 7 Pyzhevsky per., 109017, Moscow, Russia
S. I. Tsipursky
Affiliation:
Department of Geology, Arizona State University, Tempe, Arizona 85287-1404
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Abstract

Structural and diffraction criteria for distinguishing between t-1M, c-1M, m-1M, and 3T illite varieties are described. The t-1M illite corresponds to a one-layer monoclinic structure with vacant transsites. The c-1M illite has vacant cis-octahedra forming one of two symmetrically independent point systems; the other cis-octahedra as well as the trans-octahedra are occupied; and the m-1M illite corresponds to the structure in which cations are statistically distributed over available trans- and cis-sites. For t-1M, c-1M, and m-1M, the values of |c cos β/a| are equal to 0.39–0.41, 0.29–0.31, and 0.333, respectively. Application of these criteria demonstrates that illite samples described in the literature as the 3T polytype usually are c-1M instead. The relatively common occurrence of c-1M illite in association with t-1M and 2M1 polytypes has been recognized in illite from hydrothermal alterations around uranium deposits located in the Athabasca basement (Saskatchewan, Canada). The c-1M illite from these deposits was previously described as 3T one.

Keywords

Hydrothermal alterationIlliteOctahedral cation distributionPolytypeUranium depositsVacant cis-sitesVacant trans-sites
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 3 , June 1993 , pp. 389 - 398
Copyright
Copyright © 1993, The Clay Minerals Society

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