Goldschmidt demonstrated that, given the necessary thermodynamic data, it is possible to calculate phase diagrams showing where assemblage-limiting reactions occur in PT, TX, or PX space. ![]() Since the early 20th century, and seminal works by Goldschmidt and others, petrologists have known that the stability of minerals, and of mineral assemblages, may be evaluated by applying the principles of thermodynamics to natural systems. Link to Theriak-Domino website: for downloading the programs and getting general information (Alternatively, just follow the instructions that you will get when you downlaod the software.) I also have include several worked examples with explanations of input and output. To install efficiently and keep things as simple as possible, you may wish to follow the installation and set up suggestions given here (Acrobat (PDF) 113kB Jun21 11). The many files and folders can be confusing, especially for students unfamiliar with computer programming. The software can be dowloaded for free (link below) and can be installed and running in well under an hour. Konstantin Petrakakis (Department of Geological Sciences, University of Vienna, Austria) maintains the Windows version. The programs, including source code (Fortran 77), are available for both Mac and Windows. Additional programs calculate thermodynamic functions, (pseudo)binary or (pseudo)ternary phase diagrams, equilibrium phase compositional isopleths, and density, volume or modal equilibrium distributions. Domino is the key program for plotting diagrams. ![]() Theriak, the heart of the collection, calculates the stable mineral assemblage and equilibrium phase compositions for a given rock (bulk composition) at specified P, T conditions. ![]() The Theriak-Domino routines are best known for their ability to calculate and plot equilibrium phase diagrams (also known as pseudosections). The THERIAK-DOMINO software is a program collection written by Christian de Capitani (Mineralogy and Petrology Institute, University of Basel, Switzerland) - see key references at the bottom of this page. Unlike a conventional phase diagram, in this kind of diagram the stability fields of assemblages are labeled instead of the reaction lines. Equilbrium phase diagram calculated by Theriak-Domino.
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