Geologists apply geochronology techniques to the study of when igneous and metamorphic processes occurred. Their topics include local bulk composition effects of metamorphic mineral assemblages, diffusion: obstacles and opportunities in petrochronology, petrochronology by laser-ablation inductively coupled plasma mass spectrometry, secondary ionization mass spectrometry analysis in petrochronology, zircon: the metamorphic mineral, the petrochronology of zircon and baddeleyite in igneous rocks: reconstructing magmatic processes at high temporal resolution, garnet: a rock-forming mineral petrochronometer. Annotation 2017 Ringgold, Inc., Portland, OR (protoview.com)