Mn 2+ -bearing kaolinites from lateritic weathering profiles: Geochemical significance

Details Mn 2+ -bearing kaolinites from lateritic weathering profiles: Geochemical significance Mn 2+ -bearing kaolinites from lateritic weathering profiles: Geochemical significance

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.1029m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 5, pp.1029-1037

Computer Science

4

Scientific paper

Electron Paramagnetic Resonance (EPR) spectra of kaolins from several lateritic profiles from Cameroon show the presence of trace amounts of Mn 2+ . Ferruginous indurated nodules, differentiated in the intermediate zone of the profiles, present the highest Mn 2+ content. There is no relation between the concentration of Mn 2+ and the total manganese content of the samples. Most Mn 2+ ions are associated with kaolinite, with only a small part being substituted in residual muscovite. Electron paramagnetic resonance parameters are consistent with the presence of Mn 2+ outer sphere hydrated complexes. Several chemical treatments (deferration, oxidation, Na + -saturation) and heating up to 400°C do not influence the Mn 2+ EPR spectra and show that these cations are trapped within kaolinite particles. Possible trapping sites may be structural defects between adjacent kaolinite layers and/or interleaved smectite layers confined within kaolinite particles. The presence of stable Mn 2+ outer sphere complexes within kaolinite particles is interpreted as a direct witness of past fluctuations of a water table during the formation of the lateritic profile. By operating as a redox front, this water table has controlled the differentiation of the intermediate nodular zone of the lateritic profiles.

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