During diagenesis, several reactions induce changes both in phyllosilicates and organic matter, which in basins
associated to the production of hydrocarbons leads to ammonium fixation in illite and micas [1] and to dissolution
induced by organic acids [2] [3]. Dissolution processes may contribute to the smectite-to-illite transformation,
stabilized by fixation of K (and NH4
+). Ammonium is a weak acid in solution. Under neutral conditions where the
concentration of hydronium is very low (<10-7 M), ammonium contributes to smectite dissolution. The effect of
organic acid on silicates dissolution is partially known, but the potential role of ammonium is completely novel.
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