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Characterization of Soil Clay Minerals: Decomposition of X-Ray Diffraction Diagrams and High-Resolution Electron Microscopy

Published online by Cambridge University Press:  28 February 2024

Dominique Righi  and
Françoise Elsass
Dominique Righi
Affiliation:
URA 721 CNRS “Argiles, Sols et Altérations”, Faculté des Sciences, 86022 Poitiers Cedex, France
Françoise Elsass
Affiliation:
Station de Science du Sol, INRA, 78026 Versailles Cedex, France
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Abstract

Fine clays (<0.1 μm) extracted from an acid soil developed in a granite saprolite from the Massif Central, France, were characterized by X-ray diffraction (XRD) using a curve decomposition program, and high-resolution transmission electron microscopy (HRTEM) associated with a method of impregnation of moist samples. Direct measurement of d-spacings were performed on HRTEM photographs. Decomposition of XRD patterns indicated 5 to 6 different clay phases including chlorite (and/or hydroxy-interlayered vermiculite), vermiculite/smectite, illite/vermiculite and illite/smectite mixed layers. Expandable phases with decreasing layer charge (vermiculite, high- and low-charge smectite) were shown in the clay assemblage. When performed on K-saturated samples subjected to wetting and drying cycles, HRTEM observations were consistent with the XRD results. The major clay mineral phases identified by the decomposition of XRD patterns were also found by direct measurement of d-spacings on HRTEM images. Vermiculite and high-charge smectite appeared to be impregnated with preservation of their initial hydration state, whereas low-charge smectite interlayers were penetrated by the resin molecules during the impregnation procedure. It was concluded that the decomposition of XRD patterns gave a realistic analysis of the clay phases present in a complex soil clay sample, as well as the direct measurement of a limited number (50) of clay crystals on HRTEM images.

Keywords

Acid SoilDecomposition of X-ray PatternsHigh-Charge SmectiteHigh-Resolution Electron MicroscopyIllite/Smectite Mixed LayersIllite/Vermiculite Mixed LayersLow-Charge SmectiteSoil ClaysX-ray Diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 44 , Issue 6 , December 1996 , pp. 791 - 800
Copyright
Copyright © 1996, The Clay Minerals Society

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References

Anderson, S.J. and Sposito, G.. 1991. Cesium-adsorption method for measuring accessible structural surface charge. Soil Sci Soc Am J 55: 1569–1576.CrossRefGoogle Scholar
Aoudjit, H., Robert, M., Elsass, F. and Curmi, P.. 1995. Detailed study of smectite genesis in granite saprolites by analytical electron microscopy. Clay Miner 30: 135–148.CrossRefGoogle Scholar
Elsass, F. and Robert, M.. 1992. Application of high resolution electron microscopy to soil clay origin and organization in a temperate climate. Geologica Carpathica Ser Clays 2: 55–61.Google Scholar
INRA 1992. Référentiel Pédologique. Principaux sols d'Europe. Paris: Institut National de la Recherche Agronomique (INRA). 222 p.Google Scholar
Jeanroy, E.. 1972. Analyse totale des silicates naturels par spectrophotometrie d'absorption atomique. Application au sol et à ses constituants. Chim Anal 54: 159–166.Google Scholar
Kim, J.-W., Peacor, D.R., Tessier, D. and Elsass, F.. 1995. A technique for maintaining texture and permanent expansion of smectite interlayers for TEM observations. Clays Clay Miner 43: 51–57.CrossRefGoogle Scholar
Lanson, B.. 1990. Mise en évidence des mécanismes de transformation des interstratifiés illite/smectite au cours de la diagenése [thesis]. Paris: Univ of Paris VI. 366 p.Google Scholar
Lanson, B.. 1993. Decompxr, X-ray diffraction pattern decomposition program. Poitiers, France: ERM. 48 p.Google Scholar
Lanson, B. and Besson, G.. 1992. Characterization of the end of smectite-to-illite transformation: decomposition of the X-ray patterns. Clays Clay Miner 40: 40–52.CrossRefGoogle Scholar
Lanson, B. and Velde, B.. 1992. Decomposition of X-ray diffraction patterns: a convenient way to describe complex I/S diagenetic evolution. Clays Clay Miner 40: 629–643.CrossRefGoogle Scholar
Malla, P.B. and Douglas, L.A.. 1987. Identification of expanding layer silicates: layer charge vs. expansion properties. In: Schultz, L.G., van Olphen, H., Mumpton, F.A., editors. Proceedings of the International Clay Conference; 1985; Denver. Bloomington, Indiana: The Clay Minerals Society. p 227–283.Google Scholar
Reynolds, R.C.. 1985. Description of program NEWMOD for the calculation of the one-dimensional X-ray diffraction patterns of mixed-layered Clays. Hanover, New Hampshire: Reynolds RC, 8 Brook Road. 24 p.Google Scholar
Righi, D. and Meunier, A.. 1991. Characterization and genetic interpretation of clays in an acid brown soil (Dystrochrept) developed in a granitic saprolite. Clays Clay Miner 39: 519–530.CrossRefGoogle Scholar
Righi, D., Petit, S. and Bouchet, A.. 1993. Characterization of hydroxy-interlayered vermiculite and illite/smectite interstratified minerals from the weathering of chlorite in a Cryorthod. Clays Clay Miner 41: 484–495.CrossRefGoogle Scholar
Romero, R., Robert, M., Elsass, F. and Garcia, C.. 1992. Abundance of halloysite in soils developed from crystalline rocks. Contribution of transmission microscopy. Clay Miner 39: 137–141.Google Scholar
Środoń, J., Andreoli, C., Elsass, F. and Robert, M.. 1990. Direct high-resolution transmission electron microscopic measurement of expandability of mixed-layer illite/smectite in bentonite rock. Clays Clay Miner 38: 373–379.CrossRefGoogle Scholar
Tessier, D.. 1984. Etude expérimentale de l'organisation des matériaux argileux [thesis]. Paris: Univ of Paris VII. Versailles, France: INRA. 361 p.Google Scholar