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Spectroscopic Approach for Investigating the Status and Mobility of Ti in Kaolinitic Materials

Published online by Cambridge University Press:  28 February 2024

Nathalie Malengreau ,
Jean-Pierre Muller  and
Georges Calas
Nathalie Malengreau*
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09, Universités de Paris 6 et 7, 4 Place Jussieu, 75 252 Paris Cedex 05, France
Jean-Pierre Muller
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09, Universités de Paris 6 et 7, 4 Place Jussieu, 75 252 Paris Cedex 05, France O.R.S.T.O.M., Département T.O.A., 213 Rue La Fayette, 75 480 Paris Cedex 10, France
Georges Calas
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09, Universités de Paris 6 et 7, 4 Place Jussieu, 75 252 Paris Cedex 05, France
*
*Present address: Dr. Nathalie Malengreau, ESPM-ESD, University of California, 108 Hilgard Hall, Berkeley, California 94720.
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Abstract

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The form under which Ti occurs in kaolinitic materials from various environments has been investigated using second derivative diffuse reflectance spectroscopy. The position of the absorption edge may be used as a diagnostic band to determine Ti-phases (anatase, rutile, Ti-gels). Ti-oxides may be detected in kaolins, down to 0.1 wt. % TiO2. Diffuse reflectance spectra show the presence of Ti-gel-like phases occluded in sedimentary kaolinite particles. These phases, which record conditions at the time of kaolinite growth, constitute the first direct evidence of Ti mobility at the scale of mineral assemblages and question the substitution of Ti for Al in kaolinite. The nature of the Ti-oxides associated with kaolinite particles gives some constraints on the temperature conditions of hydrothermal kaolins, the evolution of sedimentary kaolin during basin diagenesis and the source of parental material in soil kaolins.

Keywords

Diffuse reflectance spectroscopyKaolinsTi-mobilityTi-status
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 5 , October 1995 , pp. 615 - 621
Copyright
Copyright © 1995, The Clay Minerals Society

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