What happen if I don´t specify "dissolve or precip"? Will the program show me all the possible models although some of them may not be right? Yes. Here is a file that makes a model. You can start from there trying to determine what you like or don't like about the model. You do have chloride decreasing, which is not possible except by dilution with another water, or you are not on the same flow path. You probably need phases like kaolinite and chalcedony if you are reacting primary silicates. Alternatively, you may have other clays that are forming. This also opens up the possibility of cation exchange, which I have not included. The -mineral_water false statement eliminates some models that generate water by moles of reaction of minerals. I prefer not to use this option, but it simplifies the result for you. If you take it out, you will find models that have mixing fractions greater than 1.0 for solution 1 and mole transfers of tens of moles for some of the minerals. Hope this gets you started. David INVERSE_MODELING -solution 1 2 -uncertainty 0.05 -range -phases Albite dis Anorthite dis Adularia dis Calcite Dolomite Fe(OH)3(a) Halite # H2O(g) N2(g) Rhodochrosite Siderite GYPSUM CO2(g) # O2(g) Chalcedony Kaolinite -mineral_water false END David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225
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