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Clays and Clay Minerals

, Volume 43, Issue 5, pp 615–621 | Cite as

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

  • Nathalie Malengreau
  • Jean-Pierre Muller
  • Georges Calas
Article

Abstract

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.

Key Words

Diffuse reflectance spectroscopy Kaolins Ti-mobility Ti-status 

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Copyright information

© The Clay Minerals Society 1995

Authors and Affiliations

  • Nathalie Malengreau
    • 1
    • 2
  • Jean-Pierre Muller
    • 1
  • Georges Calas
    • 1
  1. 1.Laboratoire de Minéralogie-CristallographieURA CNRS 09 Universités de Paris 6 et 7Paris Cedex 05France
  2. 2.Département T.O.A.O.R.S.T.O.M.Paris Cedex 10France

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