A short range interaction model applied to illite/smectite mixed-layer minerals |
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| Authors: | P Blanc A Bieber B Fritz J Duplay |
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| Institution: | (1) Centre de Géochimie de la Surface, UPR 6251-CNRS, 1 rue Blessig, F-67084 Strasbourg Cedex, France Fax: +33 03 88 36 72 35, E-mail: pblanc@illite.u-strasbg.fr, FR;(2) Institut Charles Sadron, UPR 22 – CNRS, 6 rue Boussingault, P-67083 Strasbourg Cedex, France, FR |
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| Abstract: | We present a solid solution model, able to take into account short-range interactions up to the third nearest neighbor. This
model has been applied to illite/smectite mixed-layer clay minerals and tests the relative thermodynamic stability of each
illite/smectite stacking sequence. The non-ideal energy terms have been calculated, showing a strong decrease of the interaction
energy as the distance between elements grows. From ΔG
m calculations the model predicts the following succession in I/S stacking sequences as X
i
tends to 1:R1, R2 and then R3. This succession agrees well with some mineralogical observations in natural series.
Received: July 12, 1996 / Revised, accepted: March 21, 1997 |
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