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.
Università degli Studi di Cagliari
Dipartimento di Scienze della Terra
Via Trentino 51
I-09127 Cagliari - Italy
Fax +39/070/282236 - +39/070/6757707
Description: Binary data
Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.
Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
The URL of this page is:
Last modified: $Date: 2005-09-13 21:04:21 -0600 (Tue, 13 Sep 2005) $
Visitor number 1658 since Jan 22, 1998.