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Set the chemical composition of initial system on the Basis pane.

Published byLawrence Parker Modified over 5 years ago

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Presentation on theme: "Set the chemical composition of initial system on the Basis pane."— Presentation transcript:

1

2 Set the chemical composition of initial system on the Basis pane.
Oxygenated fluid in equilibrium with calcite and hematite

3 Set up a titration path on the Reactants pane.
Pyrite addition will cause calcite to dissolve and gypsum to precipitate

4 Config → Isotopes… Calcite is in chemical equilibrium with water, but segregated isotopically Specify the isotopic composition of the initial fluid, reactant mineral pyrite, and calcite

5 Pyrite addition causes calcite to dissolve and hematite and gypsum to precipitate

6 Fluid’s 13C composition varies from initial value toward that of the dissolving calcite

7 18O composition of gypsum reflects influence of calcite composition
18O of bulk rock shifts from calcite’s value towards gypsum’s, reflecting change in mineral abundances 18O composition of gypsum reflects influence of calcite composition

8 Fluid’s 34S value decreases toward the pyrite composition (+2 ‰)
Precipitating gypsum also influenced by pyrite composition

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