Enter your initial fluid composition on the Basis pane,
then go to the Reactants pane to create a reaction path.
Titrate in 400 mg of K-feldspar
Model water-rock interaction
K-feldspar, initially undersaturated, is added to the fluid
and dissolves. New minerals form until K-feldspar reaches
equilibrium and begins to accumulate in solution.
Define one fluid on the Basis pane, then Run, “Pickup”
the results, and use as a Reactant to mix with a new fluid.
Simulate fluid mixing
Barite does not form extensively in either end
member fluid, but mixing causes the mineral to
precipitate in substantial quantities.
Polythermal reactions
Click on the “+” button to set a polythermal
run. Choose an initial and final temperature.
Alternatively set different temperatures
for the initial system and reactants.
Albite is more stable here than Microcline at
high temperatures, but as the system cools
Albite dissolves and Microcline precipitates.
Go to the Reactants pane to set up a
run in which pH varies from 4 to 12.
Fixed and sliding activity or fugacity
A sliding pH path shows strength of
sorption reactions as a function of pH.
Speciation diagram
U4+ is present as a free ion and
as complexes with OH− and Cl−
Use a “sliding pH” path to
create a speciation diagram

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