When hot magma interacts with Earth’s crust, it changes the minerals and textures of pre-existing rocks by the process of metamorphism. Conditions of metamorphism depend on the pressure, temperature, and the kinds of fluids present in magmas and the crust. These processes can also change rock chemistry by driving the release of elements including carbon which may be liberated from the rock by decarbonation. The process of decarbonation is important in Earth’s long-term natural geochemical cycles. Decarbonation also produces residual rocks called skarns. Skarn deposits are often enriched in base (W, Cu, Pb, Zn) and precious (Ag, Au) metals; thus, a deep understanding of these processes promotes our understanding of economically valuable mineral deposits with broad societal value. Through their work on the project, students will be prepared for vital roles in the geoscience workforce. In particular, they will gain skills in quantitative research methods and numerical modeling to assess the tempo and mode of metamorphic processes that transport energy, fluids, and metals as magmas intrude and crystallize in Earth's crust. Given the close association with critical minerals, the work and student training opportunities constitute a front-line effort to sustain our understanding of resources that are important for the development and advancement of modern technology and the national security of the United States. On-the-ground public outreach efforts include engaging community me