Research by Dr. Fred Gaidies et al. unlocks the fascinating history of metamorphic rocks from the Grenville Province of SE Ontario. Using a variety of techniques, including high-resolution XR-µCT, LA-ICP-MS, and in-situ Lu-Hf geochronology, Gaidies et al. provide evidence for repeated metamorphic events during the Grenvillian Orogeny. Garnet crystals, which formed during these events, developed spectacular compositional and microstructural properties, and, once again, acted as the geological time capsules needed to gain insight into our planet's past.
The paper can be found here: Polymetamorphism during the Grenvillian Orogeny in SE Ontario
Gaidies F, McCarron T, Simpson A, Easton RM, Glorie S, Putlitz B, Trebus K (2023) Polymetamorphism during the Grenvillian Orogeny in SE Ontario: Results from trace element mapping, in-situ geochronology, and diffusion geospeedometry. Journal of Metamorphic Geology, DOI:10.1111/jmg.12745
Figure credit: Fred Gaidies