Petrochronology is a rapidly emerging branch of Earth science that links time ages or rates with specific rock-forming processes and their physical conditions. It is founded in petrology and geochemistry, which define a petrogenetic context or delimit a specific process, to which chronometric data are then linked. This combination informs Earth's petrogenetic processes better than petrology or geochronology alone. This volume and the accompanying short courses address three broad categories of inquiry.12288Conceptual approaches chapters12288include petrologic modeling of multi-component chemical and mineralogic systems, and development of methods that include diffusive alteration of mineral chemistry.12288Methods chapters12288address four main analytical techniques, specifically EPMA, LA-ICP-MS, SIMS and TIMS.12288Mineral-specific chapters12288explore applications to a wide range of minerals, including zircon metamorphic, igneous, and detritalHadean, baddeleyite, REE minerals monazite,