Crystal plasticity enhances trace element mobility in garnet

Abstract Chemical heterogeneities along grain boundaries in garnet occur across a wide range of metamorphic conditions, yet the processes underlying their development remain poorly understood. Here we integrate electron backscattered diffraction (EBSD) and atom probe tomography (APT) to evaluate mechanisms driving nanoscale trace element mobility deformation microstructures granulite-facies garnet. This approach shows that low-angle can be enriched Ca, Ti, P, Cu, K, Na, Cl, H. Based on correlation between EBSD APT data, propose solute ions (Ca, Cu) were segregated interface during migration dislocation associated with ductile grain. In contrast, elements such as H are interpreted reflect diffusion boundary from an externally derived fluid source. These results provide missing link chemical heterogeneity deformation-related Our combination microstructural geochemical analyses unprecedented insights into transfer within minerals.