Abstract
Dating metamorphism accurately is one of the key issues in understanding tectonothermal events and orogenic processes. Many isotopic systems in different minerals, including rock-forming minerals and accessory minerals, have been used to define metamorphic ages. Rock-forming minerals, the most important of which is garnet, can provide P-T information that can be linked directly to their metamorphic age, which is crucial to understanding metamorphic processes. U-Pb, a paired isotopic system, is the most reliable method for dating metamorphism using accessory minerals, of which zircon is the most robust. This paper provides an overview of the methods for dating metamorphism, including the metamorphic minerals and isotopic systems used, and related concepts, such as closure temperature, diffusion rate, and mineral stability as a function of P-T. It focuses on the age significance of metamorphic minerals according to their formation conditions and petrographic and compositional relationships with associated minerals, the way to link the measured ages to P-T conditions and metamorphic processes, and the effects of overprinting of unrelated tectonothermal events. It concludes with an assessment of the current state of the art and identifies potential directions for future research.
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