Recent improvements in microanalytical techniques such as (FE-)EPMA, SIMS, LA-ICPMS, and FTIR have resulted in significant advances in our understanding of macroscopic magmatic processes and their rates. In this session, we invite contributions focusing on how the chemistry of minerals and/or their melt and fluid inclusions can be used to gain thermobarometric, geochronological, and other insights into the operation of modern and ancient igneous systems in Japan and elsewhere. We welcome volcanic and plutonic studies from all tectonic settings, including magmatic arcs, backarc basins, ocean ridges, ocean islands, and large igneous provinces.