Hostname: page-component-8448b6f56d-m8qmq Total loading time: 0 Render date: 2024-04-16T17:02:54.675Z Has data issue: false hasContentIssue false
  • English
  • Français

X-ray diffraction of oriented clays in small quantities (0·1 mg)

Published online by Cambridge University Press:  09 July 2018

A. Meunier  and
B. Velde
A. Meunier
Affiliation:
Laboratoire de Pédologie, ERA 220 du CNRS, UER Sciences de l'Université de Poitiers, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex
B. Velde
Affiliation:
Laboratoire de Géologie de l'Ecole Normale Supérieure, 46, rue d'Ulm, 75230 Paris Cedex 05, France
Get access Rights & Permissions [Opens in a new window]

Extract

Precise identification of clay minerals found in granular rocks has always posed a great problem to the clay petrographer. Even if it is possible to locate the position of authigenic clay mineral formation in a thin section, subsequent identification of this same material by X-ray diffractometry is usually very difficult. Attempts have been made using selected-area radiation of thin sections (Pawluck & Dumanski, 1973; Wicks & Zussman, 1975; Wilson & Clark, 1978) but the area analysed remains relatively large, i.e. of the order of several mm2. The other solution is micro-picking of material from a thin section and subsequent identification by Debye-Scherrer camera methods (Wallace, 1955; Rickwood, 1977). This method, however, does not allow preferred orientation, and thus precise identification, of many clay species. The ideal method is to combine micro-picking from thin sections from areas of several hundreds of square microns with an oriented sample preparation, which can then be treated in the traditional way (glycolation, heating, etc.) for characterization by X-ray diffractometry.

Type
Notes
Information
Clay Minerals , Volume 17 , Issue 2 , June 1982 , pp. 259 - 262
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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

Pawluck, S. & Dumanski, J. (1973) Ferruginous concretions in a poorly drained soil of Alberta. Proc. Soil Sci. Soc. Am. 37, 124–127.CrossRefGoogle Scholar
Rickwood, P.C. (1977) A technique for extracting small crystals from thin sections. Am. Miner. 62, 382–384.Google Scholar
Schulze, D.G. (1981) Identification of soil iron oxide minerals by differential X-ray diffraction. /. Soil Sci. Am. 45, 437–440.Google Scholar
Wallace, S.R. (1955) Removal of mineral grains from thin sections. Am. Miner. 40, 927–931.Google Scholar
Wicks, F.J. & Zussman, J. (1975) Microbeam X-ray diffraction patterns of the serpentine minerals. Can. Miner. 13, 244–258.Google Scholar
Wilson, M.J. & Clark, D.R. (1978) X-ray identification of clay materials in thin sections. J. Sedim. Petrol. 48, 656–660.CrossRefGoogle Scholar