GRTMOD is a program for modeling garnet growth and resorption stages in metamorphic rocks. It can be used for thermobarometry based on reactive bulk compositions. This version of GRTMOD requires Theriak-Domino to run Gibbs energy minimisation.
GRTMOD was developed and is maintained by Pierre Lanari (University of Bern).
Lanari, P., Giuntoli, F., Loury, C., Burn, M., Engi, M., (2017). An inverse modeling approach to obtain P-T conditions of metamorphic stages involving garnet growth and resorption. European Journal of Mineralogy, 29, 181-199.pdf
Nov. 2018 – If you do not have X-ray maps of garnet, you can use my converter file that generates pseudo X-ray intensities from garnet spot analyses. NOTE: The weighting procedure can significantly affect the results if the weights are not correctly defined (e.g. below Fig. 11 from Lanari & Duesterhoeft 2019).