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Dear Dr Parkhurst,
I have simulated dissolution of dolomite by a pure water with initial
logPCO2 = -1 in a CO2-closed system. As a mineralogical control I used
SI(calcite) = 0. I expect that Mg and Ca increase in solution during congruent
dissolution of dolomite, mantaining a molar ratio of 1, and when the equilibrium
with calcite is achieved Ca does not vary anymore whereas Mg keeps on
increasing. On the contrary, I observe that when SI(calcite) = 0 is attained Ca
begins decreasing. Why? Which is the real process occurring in nature.
Thank you for your attention.
Franco Frau
Università degli Studi di Cagliari Dipartimento di Scienze della Terra Via Trentino 51 I-09127 Cagliari - Italy Tel +39/070/6757703 Fax +39/070/282236 - +39/070/6757707 E-mail frauf@xxxxxxxx |
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