Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-28T01:22:46.419Z Has data issue: false hasContentIssue false
  • English
  • Français

Dehydroxylation of Fe3+ , Mg-rich dioctahedral micas: (I) structural transformation

Published online by Cambridge University Press:  09 July 2018

F. Muller ,
V. A. Drits ,
A. Plançon  and
G. Besson
F. Muller*
Affiliation:
ISTO, University of Orléans, CNRS, 1A, rue de la Férollerie, 45071 Orléans, Cedex 2, France
V. A. Drits
Affiliation:
Geological Institute of the Russian Academy of Sciences, Pyzhevsky per.7, MoscowRussia
A. Plançon
Affiliation:
ISTO, University of Orléans, CNRS, 1A, rue de la Férollerie, 45071 Orléans, Cedex 2, France
G. Besson
Affiliation:
ISTO, University of Orléans, CNRS, 1A, rue de la Férollerie, 45071 Orléans, Cedex 2, France
*
*E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Celadonite and glauconite samples heated at different temperatures were studied by X-ray and electron diffraction. For dioctahedral micas the in-plane component of the translation between layers (ccosβ/a), which is strongly dependent on the position of the vacant octahedral site, significantly decreases at temperatures greater than the temperature of maximum dehydroxylation. The simulation of XRD patterns from different structural models reveals the actual crystal structure of dehydroxylated samples as well as the dynamics of the structural transformations. In the nonheated state the samples consist of tv (trans-vacant) 2:1 layers. During dehydroxylation, cations migrate from cis- into trans-octahedra and have 5-fold coordination. In the averaged unit-cell the ‘residual’ anions formed after the dehydroxylation reaction occupy the former OH sites with probability equal to 0.5. The migration of octahedral cations is accompanied by the transformation of the C-centred layer unit-cells into primitive ones. In contrast to Fe, Al and Mg cations have a greater ability to migrate.

Keywords

celadoniteglauconitedehydroxylationdioctahedral mica
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 3 , June 2000 , pp. 491 - 504
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Drits, V.A., Plançon, A., Sakharov, B.A., Besson, G., Tsipursky, S.I. & Tchoubar, C. (1984) Diffraction effects calculated for structural models of Ksaturated montmorillonite containing different types of defects. Clay Miner. 19, 541 – 562.Google Scholar
Drits, V.A., Weber, F., Salyn, A. & Tsipursky, S.I. (1993) X-ray identification of one-layer illite varieties; application to the study of illite around uranium deposits of Canada. Clays Clay Miner. 41, 389 – 398.Google Scholar
Drits, V.A., Besson, G. & Muller, F. (1995) An improved model for structural transformations of heat-treated aluminous dioctahedral 2:1 layer silicates. Clays Clay Miner. 43, 718 – 731.Google Scholar
Drits, V.A., Dainyak, L.G., Muller, F., Besson, G. & Manceau, A. (1997) Isomorphous cation distribution in celadonites, glauconites and Fe-illites determined by infrared, Mössbauer and EXAFS spectroscopies. Clay Miner. 32, 153 – 179.Google Scholar
Guggenheim, S. & Koster van Groos, A.F. (1992) Highpressure differential thermal analysis (HP-DTA). II. Dehydroxydation reactions at elevated pressures in phyllosilicates. J. Therm. Anal. 38, 2529 – 2548.Google Scholar
Guggenheim, S., Chang, H.Y. & Koster van Groos, A.F. (1987) Muscovite dehydroxylation: high-temperature studies. Am. Miner. 72, 537 – 550.Google Scholar
Heller-Kallai, L. & Rozenson, I. (1980) Dehydroxylation of dioctahedral phyllosilicates. Clays Clay Miner. 28, 355 – 368.Google Scholar
Jagodzinski, H. (1954) Der symmetrieeinflub auf den allgemeinen lösungsansatz eindimensionaler fehlordnungsprobleme. Acta Cryst. 7, 17– 25.Google Scholar
Koster van Groos, A.F. & Guggenheim, S. (1987) Highpressure differential thermal analysis (HP-DTA) of the dehydroxylation of Na-rich montmorillonite and K-exchanged montmorilloni te. Am. Miner. 72, 1170 – 1175.Google Scholar
Koster van Groos, A.F. & Guggenheim, S. (1990) Dehydroxylation of Ca- and Mg-exchanged montmorillonite. Am. Miner. 74, 627 – 636.Google Scholar
McCarty, D. & Reynolds, R.C. (1995) Rotationally disordered illite-smectites in Paleozoic K-bentonites. Clays Clay Miner. 43, 271 – 284.Google Scholar
Moore, D.M. & Reynolds, R.C. (1989) X-ray Diffraction and the Identification and Analysis of Clays Minerals.Oxford University Press, New York.Google Scholar
Muller, F., Plançon, A., Drits, V.A. & Besson, G. (1998) Modelisation of X-ray powder diffraction patterns for the study of heat-treated Fe-rich dioctahedral 2:1 layer silicates. J. Phys. IV, 8, 91 – 98.Google Scholar
Muller, F., Plançon, A., Besson, G. & Drits, V.A. (1999) Nature, proportion and distribution of stacking faults in celadonite minerals. Mater. Struc. 6, 129 – 134.Google Scholar
Plançon, A. (1981) Diffraction by layer structures containing different kinds of layers and stacking faults. J. Appl. Crystallogr. 14, 300 – 304.Google Scholar
Reynolds, R.C. & Thompson, C.H. (1993) Illite from the Postdam Sandstone of New York, a probable noncentrosymmetric mica structure. Clays Clay Miner. 41, 66– 72.CrossRefGoogle Scholar
Rozenson, J. & Heller-Kallai, L. (1980) Order-disorder phenomena accompanying the dehydroxylation of dioctahedral phyllosilicates. Clays Clay Miner. 28, 391 – 392.Google Scholar
Sakharov, B.A., Besson, G., Drits, V.A., Kameneva, M.Yu., Salyn, A.N. & Smoliar, B.B. (1990) X-ray study of the nature of stacking faults in the structure of glauconites. Clay Miner. 25, 419 – 435.Google Scholar
Smoliar-Zviagina, B.B. (1993) Relationships between structural parameters and chemical composition of micas. Clay Miner. 28, 603 – 624.Google Scholar
Tsipursky, S.I., Drits, V.A. & Plançon, A. (1985) Calculation of the intensities distribution in oblique texture electron diffraction patterns. Soviet Phys. Crystallogr. 30, 38 – 44.Google Scholar
Udagawa, S., Urabe, K. & Hasu, H. (1974) The crystal structure of muscovite dehydroxylate. Japan Ass. Miner. Petrol. Econ. Geol. 69, 381 – 389.Google Scholar
Wardle, R. & Brindley, G.W. (1972) The crystal structures of pyrophyllite-1Tc and of its dehydroxylate. Am. Miner. 57, 732 – 750.Google Scholar
Zvyagin, B.B., Rabotnov, V.T., Sidorenko, O.V. & Kotelnikov, D.D. (1985) Unique mica consisting of noncentrosymmetric layers. Izvestiya Akademii Nauk S.S.S.R., Ser. Geol. 35, 121 – 124 (in Russian).Google Scholar