This example demonstrates the capabilities of PHREEQC to
perform a series of geochemical simulations, with the final simulations
relying on results from previous simulations within the same run. The
example investigates diagenetic reactions that may occur in zones where
seawater mixes with carbonate groundwater. The example is divided into five
simulations, labeled part A through part E. (A) Carbonate groundwater is
defined by equilibrating pure water with calcite at a of 10-2.0 atm. (B)
Seawater is defined by using the major-ion data given in table.9. (C) The
two solutions are mixed together in the proportions 70 percent groundwater
and 30 percent seawater. (D) The mixture is equilibrated with calcite and
dolomite. (E) The mixture is equilibrated with calcite only to investigate
the chemical evolution if dolomite precipitation is assumed to be
negligible. The example can be run using the
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