Rock Textures and Mineral Zoning: Insights into Open System Processes in Granitoides

Aim of this project is identification of the open system-processes in granitic rocks and reconstruction of p-T-x conditions before, during, and after the opening of particular magmatic system. We will study granitoids and rhyolites, which underwent different kinds of system opening: (i) mingling and mixing, (ii) subvolcanic intrusion connected with escape of volatiles and undercooling, (iii) volcanic eruption and recharge of magma chamber. The main methodological contribution of the project is a combination of modern imaging techniques (BSE and color CL), surface analytical methods ("mapping" using EMPA and LA-ICP-MS) and local microanalysis (EMPA, LA-ICP-MS). Beside this, methods of classical petrology and mineralogy (study of equilibrium vs. non-equilibrium rock textures), and methods of local geochronology (U/Pb by LA-ICP-MS) will be used. Models of magmatic evolution will be developed for each studied locality.