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聽In my research, I aim to reconstruct the major and trace elemental composition of crustal fluids with the mineral chemistry of tourmaline. In order to get the major elemental cation composition of the fluid, I measure the thermodynamic properties of the tourmaline supergroup minerals and integrate this data into internally consistent databases for solubility modeling. For the trace elemental composition of the fluid, I measure partition coefficients between fluid and synthesized tourmaline and fit the experimental data to a lattice strain model with the help of speciation prediction from phase equilibria modelling. The solubility, lattice strain, and聽pseudosection聽models are used to reconstruct the fluid evolution from a natural tourmaline in an Archean subduction zone in the聽Tartoq聽greenstone belt in SW Greenland.聽