Artificial Weathering of Oxidized Biotite: I. Potassium Removal by Sodium Chloride and Sodium Tetraphenylboron Solutions1
- R. J. Gilkes,
- R. C. Young and
- J. P. Quirk2
The rate of release of interlayer potassium from biotite to NaCl and NaCl/sodium tetraphenylboron solutions is determined by the oxidation state of octahedral iron. Octahedral cation vacancies are generated when octahedral iron is oxidized resulting in a change of orientation of hydroxyl from perpendicular to the mica layer to parallel. This in turn produces a more stable environment for interlayer potassium. Infrared absorption measurements show that the abundance of inclined hydroxyl bears a negative linear relation with the amount of potassium removed by leaching.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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